diff --git a/agent/dashboard/plan_api.py b/agent/dashboard/plan_api.py
new file mode 100644
index 00000000..8dc271cb
--- /dev/null
+++ b/agent/dashboard/plan_api.py
@@ -0,0 +1,188 @@
+"""REST API for the plan-review page: read the plan, approve, or request changes.
+
+Comment threads themselves live in the collaborative Yjs document (BlockNote's
+``YjsThreadStore``) and are harvested client-side; on approve/reject the client
+sends the harvested feedback here, where it is formatted and handed to the agent
+as the instruction for the follow-up run. The agent never sees comments during
+review — only this aggregated feedback at the decision point.
+
+Permissions: any authenticated org member can read a surfaced thread and request
+changes (reject); only the thread owner can approve.
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException
+from langgraph_sdk import get_client
+from pydantic import BaseModel, Field
+
+from .oauth import require_same_origin_for_mutations, require_session
+from .plan_store import (
+    PLAN_STATUS_APPROVED,
+    PLAN_STATUS_REVISING,
+    get_plan_content,
+    set_plan_status,
+)
+from .thread_api import (
+    _repo_config_from_metadata,
+    _thread_is_readable,
+    _thread_source,
+    _user_owns_thread,
+)
+
+logger = logging.getLogger(__name__)
+
+plan_router = APIRouter(
+    prefix="/dashboard/api/plan",
+    tags=["plan"],
+    dependencies=[Depends(require_same_origin_for_mutations)],
+)
+_SESSION_DEP = Depends(require_session)
+
+
+class PlanComment(BaseModel):
+    author: str | None = None
+    body: str = ""
+    quote: str | None = None
+    resolved: bool = False
+
+
+class PlanDecisionBody(BaseModel):
+    comments: list[PlanComment] = Field(default_factory=list)
+
+
+async def _thread_metadata(thread_id: str) -> dict[str, Any]:
+    client = get_client()
+    try:
+        thread = await client.threads.get(thread_id)
+    except Exception as exc:  # noqa: BLE001
+        raise HTTPException(404, "thread not found") from exc
+    metadata = (
+        thread.get("metadata") if isinstance(thread, dict) else getattr(thread, "metadata", None)
+    )
+    return metadata if isinstance(metadata, dict) else {}
+
+
+@plan_router.get("/{thread_id}")
+async def get_plan(thread_id: str, session: dict[str, Any] = _SESSION_DEP) -> dict[str, Any]:
+    metadata = await _thread_metadata(thread_id)
+    if not _thread_is_readable(metadata):
+        raise HTTPException(404, "thread not found")
+    login = session["sub"]
+    email = session.get("email")
+    content = await get_plan_content(thread_id) or {}
+    return {
+        "threadId": thread_id,
+        "status": content.get("status") or metadata.get("plan_status") or "planning",
+        "markdown": content.get("markdown", ""),
+        "isOwner": _user_owns_thread(metadata, login, email),
+        "user": {
+            "id": login,
+            "login": login,
+            "email": email,
+            "name": session.get("name") or login,
+        },
+    }
+
+
+@plan_router.post("/{thread_id}/approve")
+async def approve_plan(
+    thread_id: str,
+    body: PlanDecisionBody,
+    session: dict[str, Any] = _SESSION_DEP,
+) -> dict[str, Any]:
+    metadata = await _thread_metadata(thread_id)
+    if not _user_owns_thread(metadata, session["sub"], session.get("email")):
+        raise HTTPException(403, "only the plan owner can approve")
+    await set_plan_status(thread_id, PLAN_STATUS_APPROVED, plan_mode=False)
+    feedback = _format_comments(body.comments)
+    if feedback:
+        text = (
+            "The plan has been approved. Implement it now, taking this reviewer "
+            f"feedback into account:\n\n{feedback}"
+        )
+    else:
+        text = "The plan has been approved. Implement it now as described in the plan."
+    await _dispatch_followup(thread_id, metadata, text, plan_mode=False)
+    return {"status": PLAN_STATUS_APPROVED}
+
+
+@plan_router.post("/{thread_id}/reject")
+async def reject_plan(
+    thread_id: str,
+    body: PlanDecisionBody,
+    session: dict[str, Any] = _SESSION_DEP,
+) -> dict[str, Any]:
+    metadata = await _thread_metadata(thread_id)
+    if not _thread_is_readable(metadata):
+        raise HTTPException(404, "thread not found")
+    await set_plan_status(thread_id, PLAN_STATUS_REVISING, plan_mode=True)
+    feedback = _format_comments(body.comments)
+    text = (
+        "The plan needs changes before implementation. Address this reviewer "
+        "feedback and publish an updated plan with the save_plan tool:\n\n"
+        f"{feedback or '(no specific comments were left)'}"
+    )
+    await _dispatch_followup(thread_id, metadata, text, plan_mode=True)
+    return {"status": PLAN_STATUS_REVISING}
+
+
+def _format_comments(comments: list[PlanComment]) -> str:
+    lines: list[str] = []
+    for index, comment in enumerate(comments, start=1):
+        body = comment.body.strip()
+        if not body:
+            continue
+        author = (comment.author or "reviewer").strip()
+        quote = (comment.quote or "").strip()
+        status = " (resolved)" if comment.resolved else ""
+        if quote:
+            lines.append(f'{index}. On "{quote}"{status}:\n   - {author}: {body}')
+        else:
+            lines.append(f"{index}. {author}{status}: {body}")
+    return "\n".join(lines)
+
+
+async def _dispatch_followup(
+    thread_id: str, metadata: dict[str, Any], text: str, *, plan_mode: bool
+) -> None:
+    """Continue the existing thread with a new instruction run.
+
+    Runs on the same LangGraph thread, so the agent resumes from the checkpoint
+    with the full planning history plus this instruction. The configurable is
+    rebuilt from the thread's stored owner/repo/Slack context so the agent can
+    push, open a PR, and reply in the original channel.
+    """
+    configurable: dict[str, Any] = {
+        "thread_id": thread_id,
+        "source": _thread_source(metadata) or "slack",
+    }
+    email = metadata.get("triggering_user_email")
+    if isinstance(email, str) and email:
+        configurable["user_email"] = email
+    login = metadata.get("github_login")
+    if isinstance(login, str) and login:
+        configurable["github_login"] = login
+    repo = _repo_config_from_metadata(metadata)
+    if repo:
+        configurable["repo"] = repo
+    source_context = metadata.get("source_context")
+    if isinstance(source_context, dict):
+        slack_thread = source_context.get("slack_thread")
+        if isinstance(slack_thread, dict):
+            configurable["slack_thread"] = slack_thread
+    # Carry the decision to the follow-up run: approve continues out of plan
+    # mode (implement), reject stays in plan mode (revise the plan).
+    configurable["plan_mode"] = plan_mode
+
+    client = get_client()
+    await client.runs.create(
+        thread_id,
+        "agent",
+        input={"messages": [{"role": "user", "content": text}]},
+        config={"configurable": configurable},
+        if_not_exists="create",
+    )
diff --git a/agent/dashboard/plan_collab.py b/agent/dashboard/plan_collab.py
new file mode 100644
index 00000000..5810e5db
--- /dev/null
+++ b/agent/dashboard/plan_collab.py
@@ -0,0 +1,178 @@
+"""Yjs collaboration server for the plan-review document.
+
+A single :class:`WebsocketServer` (started for the app lifetime via
+:func:`collab_lifespan`) relays Yjs sync/awareness frames between the reviewers
+connected to a plan. Each plan is a room keyed by ``thread_id``; the room's
+document is seeded from / snapshotted to the LangGraph store so a plan and its
+comment threads survive a restart.
+
+The browser connects with the standard ``y-websocket`` client, which appends the
+room name to the provider URL — hence the ``/yjs/{thread_id}`` route shape.
+
+Any user who can read the thread can both edit the plan and comment — there is
+no document-level owner/commenter split (only plan *approval* is owner-gated, in
+the REST API). So relaying frames to every readable connection is intentional.
+"""
+
+from __future__ import annotations
+
+import asyncio
+import contextlib
+import logging
+from collections.abc import AsyncIterator
+from contextlib import asynccontextmanager
+from typing import Any
+
+from fastapi import APIRouter, WebSocket, WebSocketDisconnect
+from langgraph_sdk import get_client
+from pycrdt.websocket import WebsocketServer, YRoom
+from pycrdt.websocket.websocket import HttpxWebsocket
+
+from .oauth import COOKIE_NAME, _origin_of, allowed_dashboard_origins, decode_session
+from .plan_store import load_yjs_snapshot, save_yjs_snapshot
+from .thread_api import _thread_is_readable
+
+logger = logging.getLogger(__name__)
+
+collab_router = APIRouter(prefix="/dashboard/api/plan", tags=["plan-collab"])
+
+_SNAPSHOT_DEBOUNCE_SECONDS = 1.5
+
+_server: WebsocketServer | None = None
+_dirty: set[str] = set()
+# Per-room state, alive only while at least one reviewer is connected.
+_connections: dict[str, int] = {}
+_flushers: dict[str, asyncio.Task[None]] = {}
+_subscriptions: dict[str, Any] = {}
+
+
+@asynccontextmanager
+async def collab_lifespan() -> AsyncIterator[None]:
+    """Run the Yjs collaboration server for the app's lifetime."""
+    global _server
+    async with WebsocketServer(auto_clean_rooms=False) as server:
+        _server = server
+        try:
+            yield
+        finally:
+            _server = None
+            for task in _flushers.values():
+                task.cancel()
+            _flushers.clear()
+            _subscriptions.clear()
+            _connections.clear()
+            _dirty.clear()
+
+
+def _session_login(websocket: WebSocket) -> str | None:
+    token = websocket.cookies.get(COOKIE_NAME)
+    if not token:
+        return None
+    try:
+        session = decode_session(token)
+    except Exception:
+        return None
+    sub = session.get("sub") if isinstance(session, dict) else None
+    return sub if isinstance(sub, str) and sub else None
+
+
+def _origin_allowed(websocket: WebSocket) -> bool:
+    """Same-origin (CSRF) gate for the WS handshake, mirroring the REST
+    ``require_same_origin`` check: a no-op when no dashboard origins are
+    configured (local/dev), otherwise the handshake ``Origin`` must be in the
+    allowlist so a malicious site can't open a cross-site socket on the
+    victim's cookie."""
+    allowed = allowed_dashboard_origins()
+    if not allowed:
+        return True
+    origin = _origin_of(websocket.headers.get("origin", "") or "")
+    return bool(origin) and origin in allowed
+
+
+async def _can_read_thread(thread_id: str) -> bool:
+    """Same read gate as the plan REST API: only surfaced threads are joinable."""
+    try:
+        thread = await get_client().threads.get(thread_id)
+    except Exception:
+        return False
+    metadata = (
+        thread.get("metadata") if isinstance(thread, dict) else getattr(thread, "metadata", None)
+    )
+    return _thread_is_readable(metadata if isinstance(metadata, dict) else {})
+
+
+async def _open_room(server: WebsocketServer, thread_id: str) -> None:
+    """Seed the room from the store and start its snapshot flusher (idempotent
+    while connected)."""
+    if thread_id in _flushers:
+        return
+    room = await server.get_room(thread_id)
+    snapshot = await load_yjs_snapshot(thread_id)
+    if snapshot:
+        try:
+            room.ydoc.apply_update(snapshot)
+        except Exception:
+            logger.warning("Failed to seed plan doc %s from snapshot", thread_id, exc_info=True)
+
+    def _on_change(_event: object) -> None:
+        _dirty.add(thread_id)
+
+    _subscriptions[thread_id] = room.ydoc.observe(_on_change)
+    _flushers[thread_id] = asyncio.create_task(_flush_loop(thread_id, room))
+
+
+async def _close_room(thread_id: str) -> None:
+    """Tear down a room's flusher + observer once the last reviewer leaves."""
+    task = _flushers.pop(thread_id, None)
+    _subscriptions.pop(thread_id, None)
+    if task is not None:
+        task.cancel()
+        with contextlib.suppress(asyncio.CancelledError):
+            await task
+    if _server is not None and thread_id in _server.rooms:
+        await _persist(thread_id, _server.rooms[thread_id])
+    _dirty.discard(thread_id)
+
+
+async def _flush_loop(thread_id: str, room: YRoom) -> None:
+    while True:
+        await asyncio.sleep(_SNAPSHOT_DEBOUNCE_SECONDS)
+        if thread_id in _dirty:
+            _dirty.discard(thread_id)
+            await _persist(thread_id, room)
+
+
+async def _persist(thread_id: str, room: YRoom) -> None:
+    try:
+        await save_yjs_snapshot(thread_id, bytes(room.ydoc.get_update()))
+    except Exception:
+        logger.warning("Failed to snapshot plan doc %s", thread_id, exc_info=True)
+
+
+@collab_router.websocket("/yjs/{thread_id}")
+async def plan_yjs_socket(websocket: WebSocket, thread_id: str) -> None:
+    if _session_login(websocket) is None:
+        await websocket.close(code=4401)
+        return
+    if not _origin_allowed(websocket):
+        await websocket.close(code=4403)
+        return
+    if not await _can_read_thread(thread_id):
+        await websocket.close(code=4403)
+        return
+    if _server is None:
+        await websocket.close(code=1013)  # try again later
+        return
+
+    await websocket.accept()
+    await _open_room(_server, thread_id)
+    _connections[thread_id] = _connections.get(thread_id, 0) + 1
+    channel = HttpxWebsocket(websocket, thread_id)
+    try:
+        with contextlib.suppress(WebSocketDisconnect):
+            await _server.serve(channel)
+    finally:
+        _connections[thread_id] = _connections.get(thread_id, 1) - 1
+        if _connections.get(thread_id, 0) <= 0:
+            _connections.pop(thread_id, None)
+            await _close_room(thread_id)
diff --git a/agent/dashboard/plan_store.py b/agent/dashboard/plan_store.py
new file mode 100644
index 00000000..d130fa34
--- /dev/null
+++ b/agent/dashboard/plan_store.py
@@ -0,0 +1,114 @@
+"""Persistence for the collaborative plan-review feature.
+
+The plan lives in two places:
+  - the agent's sandbox, as a real ``plan.md`` file (written by the ``save_plan``
+    tool — the source artifact the agent produces and can re-read), and
+  - the LangGraph store, as the published snapshot the dashboard renders and the
+    seed for the collaborative Yjs document.
+
+Comment threads live in the Yjs document (BlockNote's ``YjsThreadStore``); the
+binary Yjs state is snapshotted here so a plan + its comments survive a sandbox
+teardown or a server restart.
+"""
+
+from __future__ import annotations
+
+import base64
+from typing import Any
+
+from langgraph_sdk import get_client
+
+PLAN_CONTENT_NAMESPACE = ["plan", "content"]
+PLAN_YJS_NAMESPACE = ["plan", "yjs"]
+
+# Plan lifecycle, stored on both the content record and the thread metadata.
+PLAN_STATUS_PLANNING = "planning"
+PLAN_STATUS_READY = "ready"
+PLAN_STATUS_REVISING = "revising"
+PLAN_STATUS_APPROVED = "approved"
+PLAN_STATUS_CANCELLED = "cancelled"
+
+
+def _client() -> Any:
+    return get_client()
+
+
+def _item_value(item: Any) -> dict[str, Any] | None:
+    if item is None:
+        return None
+    value = item.get("value") if isinstance(item, dict) else getattr(item, "value", None)
+    return value if isinstance(value, dict) else None
+
+
+async def save_plan_content(
+    thread_id: str, *, markdown: str, status: str = PLAN_STATUS_READY
+) -> None:
+    """Publish the plan markdown + status for the dashboard to render."""
+    client = _client()
+    await client.store.put_item(
+        PLAN_CONTENT_NAMESPACE,
+        thread_id,
+        {"markdown": markdown, "status": status},
+    )
+    await _merge_thread_metadata(thread_id, {"plan_status": status, "plan_mode": True})
+
+
+async def get_plan_content(thread_id: str) -> dict[str, Any] | None:
+    client = _client()
+    try:
+        item = await client.store.get_item(PLAN_CONTENT_NAMESPACE, thread_id)
+    except Exception:
+        return None
+    return _item_value(item)
+
+
+async def set_plan_status(thread_id: str, status: str, *, plan_mode: bool | None = None) -> None:
+    """Update the plan lifecycle status on both the content record and metadata."""
+    existing = await get_plan_content(thread_id) or {}
+    client = _client()
+    await client.store.put_item(
+        PLAN_CONTENT_NAMESPACE,
+        thread_id,
+        {"markdown": existing.get("markdown", ""), "status": status},
+    )
+    metadata: dict[str, Any] = {"plan_status": status}
+    if plan_mode is not None:
+        metadata["plan_mode"] = plan_mode
+    await _merge_thread_metadata(thread_id, metadata)
+
+
+async def load_yjs_snapshot(thread_id: str) -> bytes | None:
+    client = _client()
+    try:
+        item = await client.store.get_item(PLAN_YJS_NAMESPACE, thread_id)
+    except Exception:
+        return None
+    value = _item_value(item)
+    if not value:
+        return None
+    encoded = value.get("b64")
+    if not isinstance(encoded, str) or not encoded:
+        return None
+    try:
+        return base64.b64decode(encoded)
+    except (ValueError, TypeError):
+        return None
+
+
+async def save_yjs_snapshot(thread_id: str, data: bytes) -> None:
+    client = _client()
+    await client.store.put_item(
+        PLAN_YJS_NAMESPACE,
+        thread_id,
+        {"b64": base64.b64encode(data).decode("ascii")},
+    )
+
+
+async def _merge_thread_metadata(thread_id: str, metadata: dict[str, Any]) -> None:
+    client = _client()
+    try:
+        await client.threads.update(thread_id=thread_id, metadata=metadata)
+    except Exception:
+        # The thread always exists by the time a plan is saved (the run created
+        # it); a transient update failure must not crash the agent mid-run.
+        pass
diff --git a/agent/dashboard/thread_api.py b/agent/dashboard/thread_api.py
index 10a91b1c..cdad0161 100644
--- a/agent/dashboard/thread_api.py
+++ b/agent/dashboard/thread_api.py
@@ -114,6 +114,7 @@ class ThreadMessageBody(BaseModel):
     images: list[DashboardImageBody] = Field(default_factory=list)
     model_id: str | None = None
     effort: str | None = None
+    plan_mode: bool = False
 
 
 class ThreadResolveBody(BaseModel):
@@ -358,6 +359,8 @@ def _thread_summary(
         "branch": metadata.get("branch_name") or metadata.get("base_branch") or "main",
         "model": model,
         "effort": effort,
+        "planMode": metadata.get("plan_mode") is True,
+        "planStatus": metadata.get("plan_status"),
         "source": _thread_source(metadata),
         "status": status,
         "viewed": _is_thread_viewed(metadata, latest_run_id),
@@ -913,6 +916,7 @@ async def _create_dashboard_thread_record(
     title: str | None = None,
     model_id: str | None = None,
     effort: str | None = None,
+    plan_mode: bool = False,
 ) -> dict[str, Any]:
     """Create or update dashboard thread metadata without starting a run."""
     profile = await get_profile(login) or {}
@@ -937,6 +941,7 @@ async def _create_dashboard_thread_record(
         "effort": metadata_effort,
         "resolved_model": resolved_model,
         "resolved_effort": resolved_effort,
+        "plan_mode": plan_mode,
         "created_at_ms": now_ms,
         "updated_at_ms": now_ms,
     }
@@ -985,6 +990,8 @@ async def _build_dashboard_configurable(
     if isinstance(source_context, dict):
         for key, value in source_context.items():
             configurable.setdefault(key, value)
+    if metadata.get("plan_mode") is True:
+        configurable["plan_mode"] = True
     if overrides:
         for key, value in overrides.items():
             if value is not None:
@@ -1123,6 +1130,7 @@ async def _enrich_run_start_command(
         client_configurable.get("agent_model_id"),
         client_configurable.get("agent_effort"),
     )
+    plan_mode_requested = client_configurable.get("plan_mode") is True
     content = _command_message_content(params)
     overrides: dict[str, Any] = {}
 
@@ -1142,6 +1150,7 @@ async def _enrich_run_start_command(
             images=_dashboard_images_from_content(content),
             model_id=client_configurable.get("agent_model_id"),
             effort=client_configurable.get("agent_effort"),
+            plan_mode=plan_mode_requested,
         )
         metadata = thread.get("metadata") if isinstance(thread.get("metadata"), dict) else metadata
         if chosen_model and chosen_effort:
@@ -1152,7 +1161,7 @@ async def _enrich_run_start_command(
         prefix = _attribution_prefix(metadata, login, email)
         if prefix:
             _set_command_last_message_content(params, _prefix_message_content(content, prefix))
-        metadata_update: dict[str, Any] = {}
+        metadata_update: dict[str, Any] = {"plan_mode": plan_mode_requested}
         if chosen_model and chosen_effort:
             overrides["agent_model_id"] = chosen_model
             overrides["agent_effort"] = chosen_effort
@@ -1202,7 +1211,11 @@ async def send_dashboard_message(
     prompt = f"{_attribution_prefix(metadata, login, email)}{body.content.strip()}"
     now_ms = _now_ms()
     chosen_model, chosen_effort = _normalize_model_choice(body.model_id, body.effort)
-    metadata_update: dict[str, Any] = {"source": _DASHBOARD_SOURCE, "updated_at_ms": now_ms}
+    metadata_update: dict[str, Any] = {
+        "source": _DASHBOARD_SOURCE,
+        "updated_at_ms": now_ms,
+        "plan_mode": body.plan_mode,
+    }
     if chosen_model and chosen_effort:
         metadata_update["model"] = chosen_model
         metadata_update["effort"] = chosen_effort
diff --git a/agent/middleware/__init__.py b/agent/middleware/__init__.py
index 78c8a8b5..c27d3982 100644
--- a/agent/middleware/__init__.py
+++ b/agent/middleware/__init__.py
@@ -2,6 +2,7 @@ from .check_message_queue import check_message_queue_before_model
 from .exclude_tools import ExcludeToolsMiddleware
 from .model_fallback import ModelFallbackMiddleware
 from .notify_step_limit import notify_step_limit_reached
+from .plan_mode import PlanModeMiddleware
 from .refresh_github_proxy import refresh_github_proxy_before_model
 from .refresh_slack_status import SlackAssistantStatusMiddleware
 from .sandbox_circuit_breaker import SandboxCircuitBreakerMiddleware
@@ -14,6 +15,7 @@ from .tool_error_handler import ToolErrorMiddleware
 __all__ = [
     "ExcludeToolsMiddleware",
     "ModelFallbackMiddleware",
+    "PlanModeMiddleware",
     "SanitizeThinkingBlocksMiddleware",
     "SanitizeToolInputsMiddleware",
     "ToolArtifactMiddleware",
diff --git a/agent/middleware/plan_mode.py b/agent/middleware/plan_mode.py
new file mode 100644
index 00000000..342fcd40
--- /dev/null
+++ b/agent/middleware/plan_mode.py
@@ -0,0 +1,83 @@
+"""Plan-mode tool gating.
+
+Hides the mutating tools whenever plan mode is active — either when the run
+starts in plan mode (the per-thread ``plan_mode`` carried in configurable, e.g.
+a reject re-dispatch) OR after the model calls ``enter_plan_mode`` mid-run, which
+sets ``plan_mode`` in the run state. Installed unconditionally so self-activation
+actually restricts the *next* model turn (the tool list is recomputed on every
+model call), rather than only affecting a future run.
+"""
+
+from __future__ import annotations
+
+from collections.abc import Awaitable, Callable
+from typing import Any, NotRequired
+
+from langchain.agents.middleware.types import (
+    AgentMiddleware,
+    AgentState,
+    ModelRequest,
+    ModelResponse,
+)
+from langchain_core.tools import BaseTool
+
+
+class PlanModeState(AgentState):
+    # Declared so ``enter_plan_mode``'s Command update is a tracked channel that
+    # this middleware can read back from ``request.state``.
+    plan_mode: NotRequired[bool]
+
+
+def _tool_name(tool: BaseTool | dict[str, Any] | Any) -> str | None:
+    if isinstance(tool, dict):
+        name = tool.get("name")
+        return name if isinstance(name, str) else None
+    name = getattr(tool, "name", None)
+    return name if isinstance(name, str) else None
+
+
+class PlanModeMiddleware(AgentMiddleware):
+    """Strip mutating tools from each model request while plan mode is active."""
+
+    state_schema = PlanModeState
+
+    def __init__(self, *, excluded: frozenset[str], initial: bool = False) -> None:
+        self._excluded = excluded
+        self._initial = initial
+
+    def before_agent(self, state: Any, runtime: Any) -> dict[str, Any] | None:  # noqa: ARG002
+        # Reset plan_mode to the value resolved for THIS run so a stale ``True``
+        # left in the thread state by a previous run's ``enter_plan_mode`` does
+        # not silently force a later (e.g. approved/implementing) run back into
+        # plan mode. ``enter_plan_mode`` can still flip it on within this run.
+        return {"plan_mode": self._initial}
+
+    def _active(self, request: ModelRequest) -> bool:
+        if self._initial:
+            return True
+        state = getattr(request, "state", None)
+        if isinstance(state, dict):
+            return state.get("plan_mode") is True
+        return getattr(state, "plan_mode", None) is True
+
+    def _filter(self, request: ModelRequest) -> ModelRequest:
+        if not self._excluded or not self._active(request):
+            return request
+        filtered = [t for t in request.tools if _tool_name(t) not in self._excluded]
+        if len(filtered) == len(request.tools):
+            return request
+        return request.override(tools=filtered)
+
+    def wrap_model_call(
+        self,
+        request: ModelRequest,
+        handler: Callable[[ModelRequest], ModelResponse],
+    ) -> ModelResponse:
+        return handler(self._filter(request))
+
+    async def awrap_model_call(
+        self,
+        request: ModelRequest,
+        handler: Callable[[ModelRequest], Awaitable[ModelResponse]],
+    ) -> ModelResponse:
+        return await handler(self._filter(request))
diff --git a/agent/prompt.py b/agent/prompt.py
index bee73037..45ee49d0 100644
--- a/agent/prompt.py
+++ b/agent/prompt.py
@@ -69,6 +69,67 @@ You are currently executing a software engineering task. You have access to:
 - Project-specific rules and conventions from the repository's `AGENTS.md` file (read after cloning — see Repository Setup)"""
 
 
+PLAN_MODE_GUIDANCE_SECTION = """---
+
+### Plan Mode
+
+If you believe the task would benefit from a structured implementation plan before writing any code — e.g. when the request is complex, touches many files, or has multiple valid approaches — call the `enter_plan_mode` tool. This is NOT triggered by the word "plan" appearing in the request; use your judgment about whether planning is genuinely warranted. Once plan mode is active, stay read-only: research the code, then record your plan with the `save_plan` tool (it writes `plan.md` and publishes the plan to a review page) and share the plan-review link with the user. The user reviews and approves the plan before you implement.
+
+Plan-review link for this conversation (share it with the user when you enter plan mode): {plan_review_url}"""
+
+PLAN_MODE_SECTION = """---
+
+### Plan Mode (ACTIVE)
+
+**Plan mode is enabled for this run. This section supersedes any other instruction that tells you to edit code, commit, push, or open a pull request.**
+
+You are in a read-only research-and-planning phase. Your single deliverable is a clear, reviewable implementation plan saved with the `save_plan` tool — NOT code changes. The user (and any collaborators) review the plan on the plan-review page, leave inline comments, and approve it (or request changes); only then do you implement.
+
+**Plan-review link:** {plan_url}
+Share this exact link with the user (via `slack_thread_reply` or `linear_comment`) right after you enter plan mode, so they know where to follow along, and again when the plan is ready for review.
+
+**You MUST NOT:**
+- Edit, create, or delete any files in the repository (no `write_file`, no `edit_file`).
+- Run any state-changing command via `execute` — no `git commit`, `git push`, `git checkout -b`, package installs, code generators, formatters that rewrite files, or anything that mutates the filesystem, git state, or remote services. Keep `execute` to read-only commands only.
+- Commit, push, open or update a pull request, or call `request_pr_review`.
+- Create, update, or delete Linear issues, or otherwise mutate external systems.
+
+**You MAY (read-only):**
+- Clone the repo and read it: `read_file`, `ls`, `glob`, `grep`, and read-only `execute` commands (`git clone`, `git status`, `git log`, `git diff`, `cat`, `rg`, `ls`).
+- Research the web with `web_search` / `fetch_url`.
+- Ask the user clarifying questions via `slack_thread_reply` (Slack) or `linear_comment` (Linear) when the source channel is known.
+
+(The `task` subagent tool is disabled in plan mode because subagents would not inherit these read-only restrictions. Do your research directly with the read-only tools above.)
+
+**Workflow:**
+1. **Explore** — Clone (if needed) and read the relevant code to understand existing patterns, the files involved, and constraints. Read aggressively; a good plan is grounded in the actual codebase, not assumptions.
+2. **Clarify** — If the request is ambiguous or has multiple valid approaches, ask focused questions before finalizing the plan.
+3. **Plan** — Write ONE recommended implementation plan and save it with the `save_plan` tool (pass the full Markdown as `plan_markdown`). Use this structure:
+
+   ```
+   ## Plan: <short title>
+
+   ### Overview
+   <1-3 sentences on the approach and why.>
+
+   ### Files to change
+   - `path/to/file` — <what changes and why>
+   - ...
+
+   ### Steps
+   1. <ordered, concrete implementation steps>
+   2. ...
+
+   ### Risks & considerations
+   - <edge cases, migrations, cross-file impacts, anything risky>
+
+   ### Verification
+   - <how the change will be tested/validated: specific test files, lint, manual checks>
+   ```
+
+**Ending your turn:** After saving the plan with `save_plan`, post a brief completion message with the plan-review link via `slack_thread_reply` (Slack) or `linear_comment` (Linear), then stop. Explicitly invite the user to review the plan, comment, and approve it. Do not begin implementing — wait until the plan is approved (you will be re-invoked with the approval and any reviewer feedback)."""
+
+
 SELF_AWARENESS_SECTION = """---
 
 ### About You
@@ -443,6 +504,8 @@ def _render_repo_instructions_section(instructions: str | None) -> str:
 SYSTEM_PROMPT_TEMPLATE = (
     WORKING_ENV_SECTION
     + TASK_OVERVIEW_SECTION
+    + PLAN_MODE_GUIDANCE_SECTION
+    + "{plan_mode_section}"
     + SELF_AWARENESS_SECTION
     + "{default_prompt_section}"
     + REPO_SETUP_SECTION
@@ -471,6 +534,8 @@ def construct_system_prompt(
     triggering_user_identity: CollaboratorIdentity | None = None,
     create_prs: bool = False,
     default_repo: dict[str, str] | None = None,
+    plan_mode: bool = False,
+    plan_url: str | None = None,
     repo_custom_instructions: str | None = None,
     thread_url: str | None = None,
     corridor_enabled: bool = False,
@@ -494,6 +559,12 @@ def construct_system_prompt(
         working_dir=working_dir,
         linear_project_id=linear_project_id or "<PROJECT_ID>",
         linear_issue_number=linear_issue_number or "<ISSUE_NUMBER>",
+        plan_review_url=plan_url or "(the dashboard plan-review page)",
+        plan_mode_section=(
+            PLAN_MODE_SECTION.format(plan_url=plan_url or "(plan-review link unavailable)")
+            if plan_mode
+            else ""
+        ),
         default_prompt_section=default_prompt_section,
         corridor_prompt_section=CORRIDOR_PROMPT if corridor_enabled else "",
         pr_policy_override_section=ALWAYS_CREATE_PR_SECTION if create_prs else "",
diff --git a/agent/server.py b/agent/server.py
index c89b455a..757a9466 100644
--- a/agent/server.py
+++ b/agent/server.py
@@ -41,7 +41,10 @@ from .dashboard.agent_overrides import (
 )
 from .dashboard.agent_usage import record_agent_thread_usage
 from .dashboard.options import DEFAULT_MODEL_ID, SUPPORTED_MODEL_IDS, model_supports_effort
-from .dashboard.team_settings import get_team_default_model_pair, get_team_default_repo
+from .dashboard.team_settings import (
+    get_team_default_model_pair,
+    get_team_default_repo,
+)
 from .dashboard.user_mappings import email_for_login
 from .integrations.corridor_mcp import load_corridor_tools
 from .integrations.currents_tools import load_currents_tools
@@ -50,6 +53,7 @@ from .integrations.langsmith import _configure_github_proxy
 from .integrations.langsmith_tools import load_langsmith_tools
 from .middleware import (
     ModelFallbackMiddleware,
+    PlanModeMiddleware,
     SandboxCircuitBreakerMiddleware,
     SanitizeThinkingBlocksMiddleware,
     SanitizeToolInputsMiddleware,
@@ -62,6 +66,7 @@ from .middleware import (
 )
 from .prompt import construct_system_prompt
 from .tools import (
+    enter_plan_mode,
     fetch_url,
     http_request,
     linear_comment,
@@ -73,6 +78,7 @@ from .tools import (
     linear_update_issue,
     open_pull_request,
     request_pr_review,
+    save_plan,
     schedule_thread_wakeup,
     slack_read_thread_messages,
     slack_thread_reply,
@@ -84,7 +90,7 @@ from .utils.authorship import (
     OPEN_SWE_BOT_NAME,
     resolve_triggering_user_identity,
 )
-from .utils.dashboard_links import dashboard_thread_url
+from .utils.dashboard_links import dashboard_plan_url, dashboard_thread_url
 from .utils.github_app import (
     get_github_app_installation_token_with_expiry,
 )
@@ -477,6 +483,28 @@ DEFAULT_LLM_MAX_TOKENS = 64_000
 DEFAULT_RECURSION_LIMIT = 9_999
 MODEL_CALL_RECURSION_LIMIT = 5_000  # ~half the recursion limit to account for tool calls
 
+# Mutating tools hidden from the model while plan mode is active so it can only
+# research and propose a plan. `execute` stays available; plan-mode shell
+# discipline (no mutating commands) is instructed via the system prompt rather
+# than enforced. `http_request` is excluded because it can POST/PUT/PATCH/DELETE
+# to external services — read-only web research goes through `web_search` /
+# `fetch_url`. `task` is excluded because the general-purpose subagent is built
+# with its own filesystem/PR/Linear tools and does not inherit this exclusion, so
+# delegating to it would bypass the read-only intent.
+PLAN_MODE_EXCLUDED_TOOLS: frozenset[str] = frozenset(
+    {
+        "write_file",
+        "edit_file",
+        "task",
+        "http_request",
+        "open_pull_request",
+        "request_pr_review",
+        "linear_create_issue",
+        "linear_update_issue",
+        "linear_delete_issue",
+    }
+)
+
 
 def _general_purpose_subagent(model: BaseChatModel) -> SubAgent:
     return {
@@ -662,6 +690,19 @@ async def get_agent(config: RunnableConfig) -> Pregel:
         )
         logger.info("Configured model fallback %s -> %s", model_id, fallback_model_id)
 
+    # Plan mode is entered only when the model decides to (the `enter_plan_mode`
+    # tool sets it in run state). The configurable value just carries that
+    # decision across a thread's messages and the approve/reject follow-ups; a
+    # fresh run with nothing set starts out of plan mode.
+    plan_mode = configurable.get("plan_mode") is True
+    if plan_mode:
+        logger.info("Plan mode enabled for thread %s", thread_id)
+    # Installed unconditionally and state-aware: it also restricts tools after a
+    # mid-run `enter_plan_mode` call, not just when plan mode is set up front.
+    plan_mode_middleware: list[Any] = [
+        PlanModeMiddleware(excluded=PLAN_MODE_EXCLUDED_TOOLS, initial=plan_mode)
+    ]
+
     source = (
         configurable.get("source") if isinstance(configurable.get("source"), str) else "dashboard"
     )
@@ -675,6 +716,7 @@ async def get_agent(config: RunnableConfig) -> Pregel:
                 "model": model_id,
                 "effort": profile_effort,
                 "source": source,
+                "plan_mode": plan_mode,
             },
         )
         await record_agent_thread_usage(
@@ -716,6 +758,8 @@ async def get_agent(config: RunnableConfig) -> Pregel:
             triggering_user_identity=triggering_user_identity,
             create_prs=always_create_prs,
             default_repo=prompt_default_repo,
+            plan_mode=plan_mode,
+            plan_url=dashboard_plan_url(thread_id),
             repo_custom_instructions=repo_custom_instructions,
             thread_url=dashboard_thread_url(thread_id),
             corridor_enabled=bool(corridor_tools),
@@ -724,6 +768,8 @@ async def get_agent(config: RunnableConfig) -> Pregel:
             http_request,
             fetch_url,
             web_search,
+            enter_plan_mode,
+            save_plan,
             linear_comment,
             linear_create_issue,
             linear_delete_issue,
@@ -753,6 +799,7 @@ async def get_agent(config: RunnableConfig) -> Pregel:
             notify_step_limit_reached,
             SandboxCircuitBreakerMiddleware(),
             *fallback_middleware,
+            *plan_mode_middleware,
             SanitizeThinkingBlocksMiddleware(),
         ],
     ).with_config(config)
diff --git a/agent/tools/__init__.py b/agent/tools/__init__.py
index 041630a5..ef411c17 100644
--- a/agent/tools/__init__.py
+++ b/agent/tools/__init__.py
@@ -1,4 +1,5 @@
 from .add_finding import add_finding
+from .enter_plan_mode import enter_plan_mode
 from .fetch_url import fetch_url
 from .http_request import http_request
 from .linear_comment import linear_comment
@@ -16,6 +17,7 @@ from .read_repo_file import read_repo_file
 from .reply_to_finding_thread import reply_to_finding_thread
 from .request_pr_review import request_pr_review
 from .resolve_finding_thread import resolve_finding_thread
+from .save_plan import save_plan
 from .schedule_thread_wakeup import schedule_thread_wakeup
 from .search_repo_code import search_repo_code
 from .slack_read_thread_messages import slack_read_thread_messages
@@ -25,6 +27,7 @@ from .web_search import web_search
 
 __all__ = [
     "add_finding",
+    "enter_plan_mode",
     "fetch_url",
     "http_request",
     "linear_comment",
@@ -42,6 +45,7 @@ __all__ = [
     "request_pr_review",
     "reply_to_finding_thread",
     "resolve_finding_thread",
+    "save_plan",
     "schedule_thread_wakeup",
     "search_repo_code",
     "slack_read_thread_messages",
diff --git a/agent/tools/enter_plan_mode.py b/agent/tools/enter_plan_mode.py
new file mode 100644
index 00000000..9b3ab1c7
--- /dev/null
+++ b/agent/tools/enter_plan_mode.py
@@ -0,0 +1,62 @@
+"""Tool: ``enter_plan_mode``. Switch the run into read-only planning."""
+
+from __future__ import annotations
+
+import asyncio
+import logging
+from typing import Annotated
+
+from langchain_core.messages import ToolMessage
+from langchain_core.tools import InjectedToolCallId
+from langgraph.config import get_config
+from langgraph.types import Command
+
+from ..dashboard.plan_store import PLAN_STATUS_PLANNING, set_plan_status
+
+logger = logging.getLogger(__name__)
+
+_ENTERED_MESSAGE = (
+    "Plan mode is active. Stay read-only: research the codebase, then record your "
+    "implementation plan with the `save_plan` tool (it publishes the plan to the "
+    "review page) and share the plan-review link in the source channel. Do not edit "
+    "files, commit, push, or open a PR — wait for the user to approve the plan."
+)
+
+
+def enter_plan_mode(tool_call_id: Annotated[str, InjectedToolCallId]) -> Command:
+    """Activate plan mode mid-run.
+
+    Call this when you believe the task would benefit from a structured
+    implementation plan before writing any code — e.g. when the request is
+    complex, touches many files, or has multiple valid approaches. This is
+    NOT triggered by the word "plan" appearing in the request; use your
+    judgment about whether planning is genuinely warranted.
+
+    Once activated, stay read-only: research the codebase, then record your plan
+    with the ``save_plan`` tool (it publishes the plan to the review page) and
+    share the plan-review link with the user. Do not edit files, commit, push,
+    or open a PR — the user reviews the plan and approves it before you
+    implement.
+    """
+    thread_id = _thread_id_from_config()
+    if thread_id:
+        try:
+            asyncio.run(set_plan_status(thread_id, PLAN_STATUS_PLANNING, plan_mode=True))
+        except Exception:
+            logger.warning("Failed to persist plan-mode entry for %s", thread_id, exc_info=True)
+    return Command(
+        update={
+            "plan_mode": True,
+            "messages": [ToolMessage(content=_ENTERED_MESSAGE, tool_call_id=tool_call_id)],
+        }
+    )
+
+
+def _thread_id_from_config() -> str | None:
+    try:
+        config = get_config()
+    except Exception:
+        return None
+    configurable = config.get("configurable", {}) if isinstance(config, dict) else {}
+    thread_id = configurable.get("thread_id") if isinstance(configurable, dict) else None
+    return str(thread_id) if thread_id else None
diff --git a/agent/tools/save_plan.py b/agent/tools/save_plan.py
new file mode 100644
index 00000000..bab39953
--- /dev/null
+++ b/agent/tools/save_plan.py
@@ -0,0 +1,81 @@
+"""Tool: ``save_plan``. Record the implementation plan for review.
+
+Writes the plan as a real ``plan.md`` file in the sandbox (the artifact the
+agent produces and can re-read) and publishes it to the plan-review page, where
+the user and collaborators read it, comment inline, and approve or request
+changes. Available in plan mode (it does not modify the repository under review).
+"""
+
+from __future__ import annotations
+
+import asyncio
+import logging
+from typing import Any
+
+from langgraph.config import get_config
+
+from ..dashboard.plan_store import PLAN_STATUS_READY, save_plan_content
+
+logger = logging.getLogger(__name__)
+
+PLAN_FILE_PATH = "plan.md"
+
+
+def save_plan(plan_markdown: str) -> dict[str, Any]:
+    """Write your implementation plan as a markdown file and publish it for review.
+
+    Use this in plan mode once your plan is ready. The plan is saved as
+    ``plan.md`` in the sandbox and published to the plan-review page linked in
+    the conversation, where the user (the owner) and any collaborators can read
+    it, leave inline comments, and then approve it or request changes. Call it
+    again to overwrite the plan with a revised version when addressing feedback.
+
+    Write the plan in standard Markdown — headings, bullet/numbered lists, and
+    fenced code blocks all render. Structure it clearly (overview, files to
+    change, ordered steps, risks).
+
+    Args:
+        plan_markdown: The full plan, as a Markdown document.
+
+    Returns:
+        ``{success: True, path}`` on success, or ``{success: False, error}``.
+    """
+    content = plan_markdown.strip()
+    if not content:
+        return {"success": False, "error": "plan_markdown cannot be empty"}
+
+    try:
+        config = get_config()
+    except Exception:
+        config = {}
+    configurable = config.get("configurable", {}) if isinstance(config, dict) else {}
+    thread_id = configurable.get("thread_id") if isinstance(configurable, dict) else None
+    if not thread_id:
+        return {"success": False, "error": "no thread_id in run config"}
+
+    try:
+        path = asyncio.run(_save(str(thread_id), content))
+    except Exception as exc:  # noqa: BLE001
+        logger.exception("save_plan failed for thread %s", thread_id)
+        return {"success": False, "error": f"failed to save plan: {exc}"}
+    return {"success": True, "path": path}
+
+
+async def _save(thread_id: str, content: str) -> str:
+    sandbox_path = await _write_to_sandbox(thread_id, content)
+    await save_plan_content(thread_id, markdown=content, status=PLAN_STATUS_READY)
+    return sandbox_path
+
+
+async def _write_to_sandbox(thread_id: str, content: str) -> str:
+    """Write ``plan.md`` into the thread's sandbox. Best-effort: a missing sandbox
+    must not block publishing the plan to the review page."""
+    try:
+        from ..utils.sandbox_state import get_sandbox_backend
+
+        backend = await get_sandbox_backend(thread_id)
+        await backend.awrite(PLAN_FILE_PATH, content)
+        return PLAN_FILE_PATH
+    except Exception:
+        logger.warning("Could not write plan.md to sandbox for %s", thread_id, exc_info=True)
+        return PLAN_FILE_PATH
diff --git a/agent/tools/slack_thread_reply.py b/agent/tools/slack_thread_reply.py
index a65e2d1e..6bd5cb7d 100644
--- a/agent/tools/slack_thread_reply.py
+++ b/agent/tools/slack_thread_reply.py
@@ -21,6 +21,7 @@ def slack_thread_reply(
     message: str,
     options: list[str] | None = None,
     blocks: list[dict[str, Any]] | None = None,
+    plan_approval: bool = False,
 ) -> dict[str, Any]:
     """Post a message to the current Slack thread.
 
@@ -39,6 +40,8 @@ def slack_thread_reply(
     render interactive buttons and the web UI will render the same choices.
     The user can still reply manually in the Slack thread.
 
+    To present a plan for approval with action buttons, pass plan_approval=True. This renders "Approve & Implement", "Revise Plan", and "Cancel" buttons. The plan itself should be posted to the dashboard thread; use this to post a summary with a link to the dashboard thread view where the full plan can be reviewed.
+
     To mention/tag a user, use Slack's mention format: <@USER_ID>.
     You can find user IDs in the conversation context (e.g. @Name(U06KD8BFY95)).
     Example: <@U06KD8BFY95> will tag that user in the message."""
@@ -58,7 +61,10 @@ def slack_thread_reply(
         return {"success": False, "error": "Message cannot be empty"}
 
     message = convert_mentions_to_slack_format(message)
-    slack_blocks = blocks or _build_option_blocks(message, options)
+    if plan_approval:
+        slack_blocks = _build_plan_approval_blocks(message)
+    else:
+        slack_blocks = blocks or _build_option_blocks(message, options)
     message_ts, slack_error = asyncio.run(
         _post_and_store_mapping(channel_id, thread_ts, message, blocks=slack_blocks)
     )
@@ -96,6 +102,37 @@ def _build_option_blocks(message: str, options: list[str] | None) -> list[dict[s
     ]
 
 
+def _build_plan_approval_blocks(message: str) -> list[dict[str, Any]]:
+    return [
+        {"type": "section", "text": {"type": "mrkdwn", "text": message}},
+        {
+            "type": "actions",
+            "elements": [
+                {
+                    "type": "button",
+                    "text": {"type": "plain_text", "text": "Approve & Implement", "emoji": True},
+                    "style": "primary",
+                    "value": json.dumps({"type": "plan_approval", "action": "approve"}),
+                    "action_id": "open_swe_option_select",
+                },
+                {
+                    "type": "button",
+                    "text": {"type": "plain_text", "text": "Revise Plan", "emoji": True},
+                    "value": json.dumps({"type": "plan_approval", "action": "revise"}),
+                    "action_id": "open_swe_option_select",
+                },
+                {
+                    "type": "button",
+                    "text": {"type": "plain_text", "text": "Cancel", "emoji": True},
+                    "style": "danger",
+                    "value": json.dumps({"type": "plan_approval", "action": "cancel"}),
+                    "action_id": "open_swe_option_select",
+                },
+            ],
+        },
+    ]
+
+
 def _slack_reply_failure_hint(slack_error: str | None) -> str:
     if slack_error == "msg_too_long":
         return "Slack rejected the message as too long; retry with a shorter message."
diff --git a/agent/utils/dashboard_links.py b/agent/utils/dashboard_links.py
index a343a4db..5bfab9bc 100644
--- a/agent/utils/dashboard_links.py
+++ b/agent/utils/dashboard_links.py
@@ -18,6 +18,14 @@ def dashboard_thread_url(thread_id: str) -> str | None:
     return f"{base_url}/agents/{quote(thread_id, safe='')}"
 
 
+def dashboard_plan_url(thread_id: str) -> str | None:
+    """Build the dashboard plan-review URL for a given thread id."""
+    base_url = _dashboard_base_url()
+    if not base_url or not thread_id:
+        return None
+    return f"{base_url}/agents/{quote(thread_id, safe='')}/plan"
+
+
 def dashboard_review_url(owner: str, repo: str, pr_number: int) -> str | None:
     """Build the dashboard review-detail URL for a PR."""
     base_url = _dashboard_base_url()
diff --git a/agent/utils/langsmith.py b/agent/utils/langsmith.py
index c0af0924..9071cb22 100644
--- a/agent/utils/langsmith.py
+++ b/agent/utils/langsmith.py
@@ -33,54 +33,50 @@ def _build_prod_langsmith_client() -> LangSmithClient | None:
 
 
 def _resolve_project_id_by_name(project_name: str) -> str | None:
-    """Resolve a LangSmith project id from its name, caching successful lookups."""
-    cached = _PROJECT_ID_CACHE.get(project_name)
-    if cached:
-        return cached
+    """Resolve a LangSmith project id from its name, caching both successful and
+    failed lookups so an unconfigured/unauthorized tenant isn't re-queried per call."""
+    if project_name in _PROJECT_ID_CACHE:
+        return _PROJECT_ID_CACHE[project_name] or None
     client = _build_prod_langsmith_client()
     if client is None:
         return None
     try:
         project = client.read_project(project_name=project_name)
     except LangSmithNotFoundError:
+        _PROJECT_ID_CACHE[project_name] = ""
         return None
     except Exception:  # noqa: BLE001
-        logger.warning("Failed to resolve LangSmith project id for %s", project_name, exc_info=True)
+        logger.debug("Could not resolve LangSmith project id for %s", project_name)
+        _PROJECT_ID_CACHE[project_name] = ""
         return None
     project_id = getattr(project, "id", None)
-    if not project_id:
-        return None
-    resolved = str(project_id)
+    resolved = str(project_id) if project_id else ""
     _PROJECT_ID_CACHE[project_name] = resolved
-    return resolved
+    return resolved or None
 
 
-def _compose_langsmith_project_url(project_name: str = AGENT_TRACING_PROJECT) -> str:
-    """Build the LangSmith project URL base for a given tracing project name."""
-    host_url = os.environ.get("LANGSMITH_URL_PROD", "https://smith.langchain.com")
+def _compose_langsmith_project_url(project_name: str = AGENT_TRACING_PROJECT) -> str | None:
+    """Build the LangSmith project URL base, or None when tracing isn't configured
+    for the prod tenant. Bails before any API call when the tenant id is unset."""
     tenant_id = os.environ.get("LANGSMITH_TENANT_ID_PROD")
+    if not tenant_id:
+        return None
+    host_url = os.environ.get("LANGSMITH_URL_PROD", "https://smith.langchain.com")
     project_id = _resolve_project_id_by_name(project_name) or os.environ.get(
         "LANGSMITH_TRACING_PROJECT_ID_PROD"
     )
-    if not tenant_id or not project_id:
-        raise ValueError(
-            "LANGSMITH_TENANT_ID_PROD must be set and the tracing project id must be resolvable"
-        )
+    if not project_id:
+        return None
     return f"{host_url}/o/{tenant_id}/projects/p/{project_id}"
 
 
 def get_langsmith_trace_url(
     thread_id: str, project_name: str = AGENT_TRACING_PROJECT
 ) -> str | None:
-    """Build the LangSmith thread URL for a given thread ID."""
-    try:
-        project_url = _compose_langsmith_project_url(project_name)
-        return f"{project_url}/t/{thread_id}"
-    except Exception:  # noqa: BLE001
-        logger.warning(
-            "Failed to build LangSmith trace URL for thread %s", thread_id, exc_info=True
-        )
-        return None
+    """Build the LangSmith thread URL for a given thread ID, or None if tracing
+    isn't configured. This is a best-effort convenience link, not an error path."""
+    project_url = _compose_langsmith_project_url(project_name)
+    return f"{project_url}/t/{thread_id}" if project_url else None
 
 
 def _build_langsmith_feedback_clients() -> tuple[LangSmithClient, ...]:
diff --git a/agent/webapp.py b/agent/webapp.py
index 575885d4..ba13bc70 100644
--- a/agent/webapp.py
+++ b/agent/webapp.py
@@ -131,12 +131,14 @@ logger = logging.getLogger(__name__)
 
 @asynccontextmanager
 async def lifespan(_app: FastAPI) -> AsyncIterator[None]:
+    from .dashboard.plan_collab import collab_lifespan
     from .utils.model import validate_local_dev_llm_config
     from .utils.sandbox import validate_sandbox_startup_config
 
     validate_sandbox_startup_config()
     validate_local_dev_llm_config()
-    yield
+    async with collab_lifespan():
+        yield
 
 
 app = FastAPI(lifespan=lifespan)
@@ -159,6 +161,12 @@ if DASHBOARD_ALLOWED_ORIGINS:
 
 app.include_router(dashboard_router)
 
+from .dashboard.plan_api import plan_router  # noqa: E402
+from .dashboard.plan_collab import collab_router  # noqa: E402
+
+app.include_router(plan_router)
+app.include_router(collab_router)
+
 LINEAR_WEBHOOK_SECRET = os.environ.get("LINEAR_WEBHOOK_SECRET", "")
 GITHUB_WEBHOOK_SECRET = os.environ.get("GITHUB_WEBHOOK_SECRET", "")
 SLACK_SIGNING_SECRET = os.environ.get("SLACK_SIGNING_SECRET", "")
@@ -691,6 +699,68 @@ async def _ensure_thread_exists_for_metadata(
         return False
 
 
+async def _slack_user_is_thread_owner(thread_id: str, slack_user_id: str) -> bool:
+    """Whether the clicking Slack user is the user who requested the plan.
+
+    Plan approval is owner-only (mirrors the dashboard plan API's
+    ``_user_owns_thread`` gate). The original requester's Slack id is stored in
+    ``source_context.slack_thread.triggering_user_id`` when the run is created.
+    Fails closed when ownership can't be determined.
+    """
+    if not slack_user_id:
+        return False
+    langgraph_client = get_client(url=LANGGRAPH_URL)
+    try:
+        thread = await langgraph_client.threads.get(thread_id)
+    except Exception:  # noqa: BLE001
+        return False
+    metadata = thread.get("metadata") if isinstance(thread, dict) else None
+    if not isinstance(metadata, dict):
+        return False
+    source_context = metadata.get("source_context")
+    slack_thread = source_context.get("slack_thread") if isinstance(source_context, dict) else None
+    owner_id = slack_thread.get("triggering_user_id") if isinstance(slack_thread, dict) else None
+    return isinstance(owner_id, str) and bool(owner_id) and owner_id == slack_user_id
+
+
+async def _get_thread_plan_mode(thread_id: str) -> bool | None:
+    """Return the persisted plan-mode flag for a thread, or ``None`` if unset."""
+    langgraph_client = get_client(url=LANGGRAPH_URL)
+    try:
+        thread = await langgraph_client.threads.get(thread_id)
+    except Exception as exc:  # noqa: BLE001
+        if _is_not_found_error(exc):
+            return None
+        logger.warning("Failed to fetch plan-mode metadata for thread %s", thread_id)
+        return None
+    metadata = thread.get("metadata") if isinstance(thread, dict) else None
+    if not isinstance(metadata, dict):
+        return None
+    value = metadata.get("plan_mode")
+    return value if isinstance(value, bool) else None
+
+
+async def _set_thread_plan_mode(thread_id: str, enabled: bool) -> None:
+    """Persist the plan-mode flag onto thread metadata."""
+    langgraph_client = get_client(url=LANGGRAPH_URL)
+    try:
+        await langgraph_client.threads.update(
+            thread_id=thread_id, metadata={"plan_mode": bool(enabled)}
+        )
+    except Exception as exc:  # noqa: BLE001
+        if _is_not_found_error(exc):
+            try:
+                await langgraph_client.threads.create(
+                    thread_id=thread_id,
+                    if_exists="do_nothing",
+                    metadata={"plan_mode": bool(enabled)},
+                )
+            except Exception:  # noqa: BLE001
+                logger.exception("Failed to create thread %s while persisting plan_mode", thread_id)
+            return
+        logger.exception("Failed to persist plan_mode for thread %s", thread_id)
+
+
 async def process_linear_issue(  # noqa: PLR0912, PLR0915
     issue_data: dict[str, Any], repo_config: dict[str, str]
 ) -> None:
@@ -1173,6 +1243,10 @@ async def process_slack_mention(event_data: dict[str, Any], repo_config: dict[st
     if mapped_login:
         configurable["github_login"] = mapped_login
 
+    thread_plan_mode = await _get_thread_plan_mode(thread_id)
+    if thread_plan_mode is not None:
+        configurable["plan_mode"] = thread_plan_mode
+
     langgraph_client = get_client(url=LANGGRAPH_URL)
     is_first_mention = not await _thread_exists(thread_id)
     await _upsert_slack_thread_repo_metadata(thread_id, repo_config, langgraph_client)
@@ -1566,6 +1640,56 @@ async def slack_interactivity(
         action_value = json.loads(str(action.get("value") or "{}"))
     except json.JSONDecodeError:
         return {"status": "ignored", "reason": "Invalid action value"}
+    if action_value.get("type") == "plan_approval":
+        plan_action = str(action_value.get("action") or "").strip()
+        channel = payload.get("channel") if isinstance(payload.get("channel"), dict) else {}
+        message = payload.get("message") if isinstance(payload.get("message"), dict) else {}
+        container = payload.get("container") if isinstance(payload.get("container"), dict) else {}
+        user = payload.get("user") if isinstance(payload.get("user"), dict) else {}
+        channel_id = str(channel.get("id") or container.get("channel_id") or "")
+        thread_ts = str(
+            message.get("thread_ts") or message.get("ts") or container.get("thread_ts") or ""
+        )
+        user_id = str(user.get("id") or "")
+        if not channel_id or not thread_ts:
+            return {"status": "ignored", "reason": "Missing Slack action context"}
+
+        thread_id = generate_thread_id_from_slack_thread(channel_id, thread_ts)
+
+        if plan_action == "cancel":
+            await post_slack_thread_reply(
+                channel_id=channel_id,
+                thread_ts=thread_ts,
+                text="Plan cancelled. No changes will be made.",
+            )
+            return {"status": "accepted", "message": "Plan cancelled"}
+
+        if plan_action == "approve":
+            if not await _slack_user_is_thread_owner(thread_id, user_id):
+                await post_slack_thread_reply(
+                    channel_id=channel_id,
+                    thread_ts=thread_ts,
+                    text="Only the person who requested this plan can approve it. Anyone can reply with feedback or use *Revise Plan*.",
+                )
+                return {"status": "ignored", "reason": "approver is not the thread owner"}
+            await _set_thread_plan_mode(thread_id, False)
+            repo_config = await get_slack_repo_config(channel_id, thread_ts, slack_user_id=user_id)
+            background_tasks.add_task(
+                process_slack_mention,
+                {
+                    "channel_id": channel_id,
+                    "thread_ts": thread_ts,
+                    "event_ts": str(message.get("ts") or ""),
+                    "user_id": user_id,
+                    "text": "Proceed with the approved plan. Implement the changes as described in the plan.",
+                    "bot_user_id": SLACK_BOT_USER_ID,
+                },
+                repo_config,
+            )
+            return {"status": "accepted", "message": "Plan approved, starting implementation"}
+
+        return {"status": "accepted", "message": "Reply to revise the plan"}
+
     if action_value.get("type") != "open_swe_option":
         return {"status": "ignored", "reason": "Unknown action type"}
 
diff --git a/package.json b/package.json
new file mode 100644
index 00000000..4feb374d
--- /dev/null
+++ b/package.json
@@ -0,0 +1,7 @@
+{
+  "name": "open-swe",
+  "private": true,
+  "scripts": {
+    "dev:mock": "bash tests/e2e/dev-mock.sh"
+  }
+}
diff --git a/pyproject.toml b/pyproject.toml
index 5d43456f..c53a4196 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,6 +29,8 @@ dependencies = [
     "exa-py>=2.13.0",
     "langchain-google-genai>=4.2.4",
     "langchain-mcp-adapters>=0.2.2",
+    "pycrdt>=0.14.1,<0.15",
+    "pycrdt-websocket>=0.16.3,<0.17",
 ]
 
 [project.optional-dependencies]
diff --git a/tests/e2e/dev-mock.sh b/tests/e2e/dev-mock.sh
new file mode 100644
index 00000000..5a53106e
--- /dev/null
+++ b/tests/e2e/dev-mock.sh
@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+# Local dev against the mock harness, with a REAL LLM and a Vite HMR dev server.
+# The browser uses a SINGLE origin ($UI, the Vite HMR server): your ui/src edits
+# hot-reload, and Vite proxies the API + Yjs collaboration WebSocket + mock
+# Slack/GitHub + sign-in to the harness ($API). Same-origin is what lets the
+# session cookie ride the plan-review WebSocket (cross-origin WS drops it).
+# The LLM is real; only the Slack/GitHub SaaS boundaries are faked.
+set -euo pipefail
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+cd "$ROOT"
+
+API_PORT="${E2E_PORT:-2024}"
+UI_PORT="${UI_PORT:-3000}"
+API="http://127.0.0.1:${API_PORT}"
+UI="http://127.0.0.1:${UI_PORT}"
+
+# Use a real OpenAI key. The agent talks to OpenAI directly, so a LangSmith
+# gateway key (lsv2_*) stray in the shell won't authenticate — prefer .env's
+# OPENAI_API_KEY unless the shell already holds an OpenAI-looking key (sk-…).
+# Pulled line-by-line, not by sourcing .env, which would clobber the harness's
+# test env (SANDBOX_TYPE, DASHBOARD_*, …).
+case "${OPENAI_API_KEY:-}" in
+  sk-*) : ;;
+  *)
+    if [ -f .env ]; then
+      export OPENAI_API_KEY="$(grep -E '^OPENAI_API_KEY=' .env | head -1 | cut -d= -f2- | tr -d "\"'")"
+    fi
+    ;;
+esac
+case "${OPENAI_API_KEY:-}" in
+  sk-*) : ;;
+  *) echo "WARNING: OPENAI_API_KEY is not an OpenAI key (sk-…); model calls will 401." >&2 ;;
+esac
+
+# Single origin = the Vite HMR server ($UI). Agent links, the sign-in redirect,
+# and the same-origin/WS allowlist all point there; the UI calls the API on its
+# own origin and Vite proxies it (and the WS) to the harness.
+export DASHBOARD_BASE_URL="$UI"
+export DASHBOARD_ALLOWED_ORIGINS="$UI"
+
+[ -d ui/node_modules ] || (cd ui && bun install)
+
+echo
+echo "┌──────────────────────────────────────────────────────────────────────┐"
+echo "│  START HERE →  ${UI}/login                            │"
+echo "│  Continue with GitHub → pick Alice or Bob (mock sign-in)              │"
+echo "└──────────────────────────────────────────────────────────────────────┘"
+echo "  Mock Slack:  ${UI}/mock/slack          (send as Alice or Bob)"
+echo "  Everything is on ${UI} (Vite HMR; API + WS proxied to the harness)."
+echo "  LLM is real; Slack/GitHub are mocked. Open two browser profiles to be"
+echo "  two users (Alice owns the plan; Bob can comment + request changes)."
+echo
+
+E2E_REAL_LLM=1 uv run langgraph dev --config tests/e2e/langgraph.e2e.json \
+  --port "${API_PORT}" --no-browser --allow-blocking --no-reload &
+HARNESS=$!
+trap 'kill "${HARNESS}" 2>/dev/null || true' EXIT INT TERM
+
+# E2E_HARNESS activates the dev-only proxy plugin in ui/vite.config.ts; an empty
+# API base means the UI calls its own origin (proxied), keeping it same-origin.
+cd ui
+exec env E2E_HARNESS="${API}" VITE_DASHBOARD_API_BASE_URL="" \
+  ./node_modules/.bin/vite dev --host 127.0.0.1 --port "${UI_PORT}"
diff --git a/tests/e2e/e2e_env.py b/tests/e2e/e2e_env.py
index 9c658844..a193f4f7 100644
--- a/tests/e2e/e2e_env.py
+++ b/tests/e2e/e2e_env.py
@@ -67,11 +67,20 @@ _DEFAULTS = {
     "DASHBOARD_JWT_SECRET": "test-dashboard-jwt-secret",
 }
 
-# The Slack run's triggering user (fake users.info returns this email) — the
-# thread owner. A session with this email may continue the thread on the web.
-SAME_USER = {"login": "dev-user", "email": "dev@example.com"}
-# Any other logged-in user: can view the thread read-only, cannot post.
-OTHER_USER = {"login": "someone-else", "email": "someone@example.com"}
+# Named test users (the Slack sender dropdown + the dashboard login picker, and
+# the identities the automated tests log in as). Each maps a Slack sender id to
+# a dashboard login with a matching email, so the Slack thread's owner (resolved
+# by email) is the same person when they sign in. The first (Alice) is the
+# default Slack sender, hence the default thread owner.
+TEST_USERS = [
+    {"name": "Alice", "slack_id": "U_ALICE", "login": "alice", "email": "alice@example.com"},
+    {"name": "Bob", "slack_id": "U_BOB", "login": "bob", "email": "bob@example.com"},
+]
+
+# The default Slack sender / thread owner; a session with this email may continue
+# the thread on the web. Any other logged-in user is read-only.
+SAME_USER = {"login": TEST_USERS[0]["login"], "email": TEST_USERS[0]["email"]}
+OTHER_USER = {"login": TEST_USERS[1]["login"], "email": TEST_USERS[1]["email"]}
 
 for _k, _v in _DEFAULTS.items():
     os.environ.setdefault(_k, _v)
diff --git a/tests/e2e/fake_llm.py b/tests/e2e/fake_llm.py
index 2552a996..21dfe5d4 100644
--- a/tests/e2e/fake_llm.py
+++ b/tests/e2e/fake_llm.py
@@ -46,6 +46,19 @@ echo PUSHED_OK
 """.strip()
 
 
+_PLAN_URL_RE = re.compile(r"https?://[^\s\"'<>)\]|]+/plan\b")
+
+
+def _text(content: Any) -> str:
+    if isinstance(content, str):
+        return content
+    if isinstance(content, list):
+        return " ".join(
+            part.get("text", "") if isinstance(part, dict) else str(part) for part in content
+        )
+    return str(content)
+
+
 def _pr_url_from_messages(messages: list[BaseMessage]) -> str | None:
     for msg in reversed(messages):
         if isinstance(msg, ToolMessage):
@@ -56,6 +69,28 @@ def _pr_url_from_messages(messages: list[BaseMessage]) -> str | None:
     return None
 
 
+def _plan_url_from_messages(messages: list[BaseMessage]) -> str | None:
+    """The plan-review URL is injected into the system prompt; a real model would
+    read it the same way."""
+    for msg in messages:
+        match = _PLAN_URL_RE.search(_text(msg.content))
+        if match:
+            return match.group(0).rstrip(".,")
+    return None
+
+
+def _reviewer_feedback(messages: list[BaseMessage]) -> str | None:
+    """The harvested reviewer comments the backend hands the agent on approval."""
+    humans = [m for m in messages if isinstance(m, HumanMessage)]
+    if not humans:
+        return None
+    text = _text(humans[-1].content)
+    idx = text.lower().find("feedback")
+    if "approved" in text.lower() and idx != -1:
+        return text[idx:].strip()
+    return None
+
+
 def _step_implement(_messages: list[BaseMessage]) -> AIMessage:
     return AIMessage(
         content="Setting up the repo and implementing the change.",
@@ -86,9 +121,11 @@ def _step_open_pr(_messages: list[BaseMessage]) -> AIMessage:
 
 def _step_reply(messages: list[BaseMessage]) -> AIMessage:
     url = _pr_url_from_messages(messages) or "(PR url unavailable)"
+    feedback = _reviewer_feedback(messages)
+    extra = f"\n\nReviewer feedback I addressed:\n{feedback}" if feedback else ""
     text = (
         f"✅ Done! I implemented the change and opened a PR: <{url}|{PR_TITLE}>\n\n"
-        f"• Added `{FEATURE_FILE}` with a `greet()` helper.\n"
+        f"• Added `{FEATURE_FILE}` with a `greet()` helper.{extra}\n"
         "Let me know if you'd like any changes."
     )
     return AIMessage(
@@ -97,6 +134,97 @@ def _step_reply(messages: list[BaseMessage]) -> AIMessage:
     )
 
 
+# --- plan-mode flow --------------------------------------------------------
+PLAN_MARKDOWN = """## Plan: Add greet() helper
+
+### Overview
+Add a tiny greeting helper to the demo repo.
+
+### Files to change
+- `greet.py` — new module exposing a `greet(name)` function.
+
+### Steps
+1. Create `greet.py` with a `greet(name)` function.
+2. Open a draft PR with the change.
+
+### Verification
+- Import `greet` and confirm it returns the expected string.
+"""
+
+
+def _step_enter_plan(_messages: list[BaseMessage]) -> AIMessage:
+    return AIMessage(
+        content="This is worth planning first — entering plan mode.",
+        tool_calls=[{"name": "enter_plan_mode", "args": {}, "id": "call-enter-plan"}],
+    )
+
+
+def _step_plan_link(messages: list[BaseMessage]) -> AIMessage:
+    url = _plan_url_from_messages(messages) or "(plan link unavailable)"
+    return AIMessage(
+        content="Sharing the plan-review link.",
+        tool_calls=[
+            {
+                "name": "slack_thread_reply",
+                "args": {
+                    "message": f"I'm putting together a plan. Follow along and review it here: <{url}|plan review>"
+                },
+                "id": "call-plan-link",
+            }
+        ],
+    )
+
+
+def _step_plan_research(_messages: list[BaseMessage]) -> AIMessage:
+    return AIMessage(
+        content="Reading the repo to ground the plan.",
+        tool_calls=[
+            {"name": "execute", "args": {"command": "echo planning && ls"}, "id": "call-plan-read"}
+        ],
+    )
+
+
+def _step_save_plan(_messages: list[BaseMessage]) -> AIMessage:
+    return AIMessage(
+        content="Saving the plan for review.",
+        tool_calls=[
+            {"name": "save_plan", "args": {"plan_markdown": PLAN_MARKDOWN}, "id": "call-save-plan"}
+        ],
+    )
+
+
+def _step_plan_complete(messages: list[BaseMessage]) -> AIMessage:
+    url = _plan_url_from_messages(messages) or "(plan link unavailable)"
+    return AIMessage(
+        content="Announcing the plan is ready.",
+        tool_calls=[
+            {
+                "name": "slack_thread_reply",
+                "args": {
+                    "message": f"✅ The plan is ready for review: <{url}|open the plan>. "
+                    "Take a look, leave comments, and approve it when you're happy."
+                },
+                "id": "call-plan-done",
+            }
+        ],
+    )
+
+
+def _step_plan_end(_messages: list[BaseMessage]) -> AIMessage:
+    return AIMessage(content="I'll wait for your review and approval before implementing.")
+
+
+def build_plan_script() -> list[Any]:
+    return [
+        _step_enter_plan,
+        _step_plan_link,
+        _step_plan_research,
+        _step_save_plan,
+        _step_plan_complete,
+        _step_plan_end,
+    ]
+
+
 FOLLOW_UP_REPLY = "Thanks! The PR is ready for review — anything else you'd like changed?"
 
 
@@ -133,13 +261,23 @@ class FakeScriptedChatModel(BaseChatModel):
         run_manager: CallbackManagerForLLMRun | None = None,  # noqa: ARG002
         **kwargs: Any,
     ) -> ChatResult:
-        # First human turn implements + opens the PR; later turns (a web/Slack
-        # follow-up on the same thread) just reply.
-        human_turns = sum(1 for m in messages if isinstance(m, HumanMessage))
-        script = build_script() if human_turns <= 1 else build_followup_script()
+        humans = [m for m in messages if isinstance(m, HumanMessage)]
+        first_text = _text(humans[0].content) if humans else ""
+        last_text = _text(humans[-1].content) if humans else ""
+
+        # Pick the script for the current turn by what the latest human asked.
+        if _is_approval(last_text):
+            script = build_script()  # implement + open PR + reply
+        elif _is_revision(last_text):
+            script = build_plan_script()  # re-plan after requested changes
+        elif _is_plan_request(first_text) and len(humans) <= 1:
+            script = build_plan_script()  # first ask was to plan
+        elif len(humans) <= 1:
+            script = build_script()
+        else:
+            script = build_followup_script()
 
         # Step within the *current* turn: AIMessages since the last human turn.
-        # (Counting the whole thread would short-circuit reused/multi-turn threads.)
         last_human = max(
             (i for i, m in enumerate(messages) if isinstance(m, HumanMessage)), default=-1
         )
@@ -147,5 +285,19 @@ class FakeScriptedChatModel(BaseChatModel):
         if step < len(script):
             message = script[step](messages)
         else:
-            message = AIMessage(content="All set — the PR is open and linked in the thread.")
+            message = AIMessage(content="All set — let me know if you'd like anything else.")
         return ChatResult(generations=[ChatGeneration(message=message)])
+
+
+def _is_plan_request(text: str) -> bool:
+    return "plan" in text.lower()
+
+
+def _is_approval(text: str) -> bool:
+    t = text.lower()
+    return "approved" in t and "implement" in t
+
+
+def _is_revision(text: str) -> bool:
+    t = text.lower()
+    return "needs changes" in t or "publish an updated plan" in t
diff --git a/tests/e2e/harness.py b/tests/e2e/harness.py
index e192c75d..e3d98cb6 100644
--- a/tests/e2e/harness.py
+++ b/tests/e2e/harness.py
@@ -36,9 +36,26 @@ from e2e_env import (  # noqa: E402
     DEMO_CHANNEL,
     HUMAN_USER,
     REPO_ROOT,
+    TEST_USERS,
 )
 from fastapi import HTTPException, Request  # noqa: E402
-from fastapi.responses import FileResponse, HTMLResponse, JSONResponse  # noqa: E402
+from fastapi.responses import (  # noqa: E402
+    FileResponse,
+    HTMLResponse,
+    JSONResponse,
+    RedirectResponse,
+    Response,
+)
+
+# Slack-user directory the fake ``users.info`` resolves: the default sender used
+# by the automated tests plus the named manual-test users.
+_SLACK_USERS: dict[str, dict[str, str]] = {
+    HUMAN_USER: {"name": "devuser", "real_name": "Dev User", "email": "dev@example.com"},
+    **{
+        u["slack_id"]: {"name": u["login"], "real_name": u["name"], "email": u["email"]}
+        for u in TEST_USERS
+    },
+}
 
 from agent.dashboard.oauth import COOKIE_NAME, issue_session  # noqa: E402
 from agent.webapp import app, generate_thread_id_from_slack_thread  # noqa: E402
@@ -74,11 +91,14 @@ async def slack_send(request: Request) -> JSONResponse:
     form = await request.json()
     text = str(form.get("text", ""))
     mention_bot = bool(form.get("mention_bot", True))
+    # Sender defaults to the first test user (Alice) — the canonical owner the
+    # automated tests log in as; the mock UI passes the chosen test user.
+    user_id = str(form.get("user") or TEST_USERS[0]["slack_id"])
     channel = DEMO_CHANNEL
 
     ts = fakes.new_thread_ts()
     CURRENT_THREAD["thread_ts"] = ts
-    fakes.add_slack_message(channel, ts, user=HUMAN_USER, text=text, is_bot=False)
+    fakes.add_slack_message(channel, ts, user=user_id, text=text, is_bot=False)
 
     payload = {
         "type": "event_callback",
@@ -87,7 +107,7 @@ async def slack_send(request: Request) -> JSONResponse:
         "event": {
             "type": "app_mention" if mention_bot else "message",
             "channel": channel,
-            "user": HUMAN_USER,
+            "user": user_id,
             "text": text,
             "ts": ts,
             "thread_ts": ts,
@@ -131,6 +151,82 @@ async def control_login(request: Request) -> JSONResponse:
     return resp
 
 
+@app.get("/control/login")
+async def control_login_get(login: str = "", email: str = "", next_url: str = "") -> Response:
+    """Browser login. With no ``login``, render a dropdown of the test users;
+    with ``?login=<u>`` (email resolved from the registry, or pass ``&email=``),
+    mint the session cookie and redirect into the dashboard. Use a separate
+    browser/profile per user — each has its own cookie jar."""
+    # Land on the dashboard origin (DASHBOARD_BASE_URL — the Vite HMR server in
+    # dev:mock), not this harness, so the cookie + the hot-reloading UI line up.
+    ui = os.environ.get("DASHBOARD_BASE_URL", "").rstrip("/")
+    dest = next_url or (f"{ui}/agents" if ui else "/agents")
+    if not login:
+        options = "".join(f'<option value="{u["login"]}">{u["name"]}</option>' for u in TEST_USERS)
+        return HTMLResponse(
+            f"""<!doctype html><meta charset=utf-8><title>Mock login</title>
+            <body style="font-family:system-ui;max-width:420px;margin:3rem auto;padding:0 1rem">
+            <h1 style="font-size:1.1rem">Sign in (mock)</h1>
+            <form method=get action=/control/login>
+              <select name=login style="font:inherit;padding:0.4rem">{options}</select>
+              <button style="font:inherit;padding:0.45rem 0.9rem;cursor:pointer">Sign in</button>
+            </form>
+            <p style="color:#888;font-size:0.85rem">Tip: use a separate browser or profile per
+            user so their sessions don't overwrite each other.</p>
+            </body>"""
+        )
+    if not email:
+        match = next((u for u in TEST_USERS if u["login"] == login), None)
+        email = match["email"] if match else f"{login}@example.com"
+    token = issue_session(login=login, email=email, avatar_url=None)
+    resp = RedirectResponse(url=dest, status_code=303)
+    resp.set_cookie(COOKIE_NAME, token, httponly=True, samesite="lax", secure=False, path="/")
+    return resp
+
+
+@app.get("/dashboard/api/auth/login")
+async def mock_github_login(redirect_to: str = "", login: str = "") -> Response:
+    """Mock stand-in for GitHub OAuth: the dashboard's "Continue with GitHub"
+    button lands here. With no ``login``, render a picker of the fake GitHub
+    test users; once one is chosen, mint the real session cookie and redirect
+    back into the dashboard (``redirect_to``)."""
+    ui = os.environ.get("DASHBOARD_BASE_URL", "").rstrip("/")
+    dest = redirect_to or (f"{ui}/agents" if ui else "/agents")
+    if not login:
+        options = "".join(
+            f'<option value="{u["login"]}">{u["name"]} (@{u["login"]})</option>' for u in TEST_USERS
+        )
+        return HTMLResponse(
+            f"""<!doctype html><meta charset=utf-8><title>Continue with GitHub (mock)</title>
+            <body style="font-family:system-ui;max-width:420px;margin:3rem auto;padding:0 1rem">
+            <h1 style="font-size:1.1rem">Continue with GitHub (mock)</h1>
+            <p style="color:#888;font-size:0.9rem">Pick a fake GitHub account to sign in as.</p>
+            <form method=get action=/dashboard/api/auth/login>
+              <input type=hidden name=redirect_to value="{dest}">
+              <select name=login style="font:inherit;padding:0.4rem">{options}</select>
+              <button style="font:inherit;padding:0.45rem 0.9rem;cursor:pointer">Continue</button>
+            </form>
+            <p style="color:#888;font-size:0.85rem">Tip: use a separate browser or profile per
+            user so their sessions don't overwrite each other.</p>
+            </body>"""
+        )
+    match = next((u for u in TEST_USERS if u["login"] == login), None)
+    email = match["email"] if match else f"{login}@example.com"
+    token = issue_session(login=login, email=email, avatar_url=None)
+    resp = RedirectResponse(url=dest, status_code=303)
+    resp.set_cookie(COOKIE_NAME, token, httponly=True, samesite="lax", secure=False, path="/")
+    return resp
+
+
+# The real dashboard registered /dashboard/api/auth/login first (via
+# include_router), so Starlette would match it before ours. Move ours to the
+# front of the table so the mock picker shadows the real OAuth redirect.
+for _i, _route in enumerate(app.router.routes):
+    if getattr(_route, "endpoint", None) is mock_github_login:
+        app.router.routes.insert(0, app.router.routes.pop(_i))
+        break
+
+
 @app.post("/control/logout")
 async def control_logout() -> JSONResponse:
     resp = JSONResponse({"ok": True})
@@ -195,11 +291,22 @@ async def ui_agents_thread(thread_id: str) -> FileResponse:  # noqa: ARG001
     return _ui_file("_shell.html")
 
 
+@app.get("/agents/{thread_id}/plan", response_class=HTMLResponse)
+async def ui_agents_plan(thread_id: str) -> FileResponse:  # noqa: ARG001
+    return _ui_file("_shell.html")
+
+
 @app.get("/login", response_class=HTMLResponse)
 async def ui_login() -> FileResponse:
     return _ui_file("_shell.html")
 
 
+@app.get("/mock/users")
+async def mock_users() -> JSONResponse:
+    """The named test users that drive the Slack sender + login dropdowns."""
+    return JSONResponse(TEST_USERS)
+
+
 @app.get("/mock/slack/messages")
 async def slack_messages() -> JSONResponse:
     thread = CURRENT_THREAD["thread_ts"]
@@ -363,16 +470,19 @@ async def slack_reactions_add(request: Request) -> JSONResponse:
 
 @app.get("/fake-slack/users.info")
 async def slack_users_info(user: str = "") -> JSONResponse:
+    info = _SLACK_USERS.get(
+        user, {"name": "devuser", "real_name": "Dev User", "email": "dev@example.com"}
+    )
     return _ok(
         {
             "user": {
                 "id": user,
-                "name": "devuser",
-                "real_name": "Dev User",
+                "name": info["name"],
+                "real_name": info["real_name"],
                 "profile": {
-                    "email": "dev@example.com",
-                    "display_name": "Dev User",
-                    "real_name": "Dev User",
+                    "email": info["email"],
+                    "display_name": info["real_name"],
+                    "real_name": info["real_name"],
                 },
             }
         }
diff --git a/tests/e2e/patches.py b/tests/e2e/patches.py
index eb6332ad..a9fb0115 100644
--- a/tests/e2e/patches.py
+++ b/tests/e2e/patches.py
@@ -12,8 +12,13 @@ process), so it runs before the first run regardless of import order. Idempotent
 
 from __future__ import annotations
 
+import logging
+import os
+
 import e2e_env  # noqa: F401  (sets env before any agent import)
 
+logger = logging.getLogger(__name__)
+
 _applied = False
 
 
@@ -34,12 +39,20 @@ def apply() -> None:
     opr = importlib.import_module("agent.tools.open_pull_request")
 
     from e2e_env import FAKE_GITHUB_API, FAKE_SLACK_API
-    from fake_llm import FakeScriptedChatModel, build_script
 
-    def _fake_make_model(model_id: str, **kwargs: object):  # noqa: ARG001
-        return FakeScriptedChatModel(script=build_script())
+    # The LLM is the only agent-internal piece we fake, and only by default.
+    # Set E2E_REAL_LLM=1 to drive the harness (mock Slack/GitHub, real agent)
+    # with a real model — useful for manually exercising plan review etc. The
+    # provider key (e.g. ANTHROPIC_API_KEY) must be in the environment.
+    if os.environ.get("E2E_REAL_LLM"):
+        logger.warning("E2E_REAL_LLM set — using the real model factory, not the scripted fake")
+    else:
+        from fake_llm import FakeScriptedChatModel, build_script
 
-    server.make_model = _fake_make_model
+        def _fake_make_model(model_id: str, **kwargs: object):  # noqa: ARG001
+            return FakeScriptedChatModel(script=build_script())
+
+        server.make_model = _fake_make_model
 
     async def _dummy_install_token_with_expiry() -> tuple[str, str | None]:
         return "dummy-installation-token", None
diff --git a/tests/e2e/static/slack.html b/tests/e2e/static/slack.html
index 5743a30a..ba806672 100644
--- a/tests/e2e/static/slack.html
+++ b/tests/e2e/static/slack.html
@@ -20,6 +20,7 @@
   <body>
     <h1>#demo — Slack (mock)</h1>
     <div class="compose">
+      <select id="user" title="sender"></select>
       <input id="text" value="<@U0BOT> please add a greet() helper and open a PR" />
       <button id="send">Send</button>
       <button id="reset">Reset</button>
@@ -29,11 +30,22 @@
 
     <script>
       const $ = (id) => document.getElementById(id);
+      const userNames = {}; // slack_id -> display name
+
+      async function loadUsers() {
+        try {
+          const users = await (await fetch("/mock/users")).json();
+          $("user").innerHTML = users
+            .map((u) => `<option value="${u.slack_id}">${u.name}</option>`)
+            .join("");
+          for (const u of users) userNames[u.slack_id] = u.name;
+        } catch (_) {}
+      }
 
       function render(messages) {
         const html = messages
           .map((m) => {
-            const who = m.is_bot ? "open-swe (bot)" : "you";
+            const who = m.is_bot ? "open-swe (bot)" : userNames[m.user] || m.user;
             const linked = m.text.replace(/<(https?:\/\/[^|>]+)\|([^>]+)>/g, '<a href="$1">$2</a>');
             return `<div class="msg ${m.is_bot ? "bot" : ""}" data-bot="${m.is_bot}"><div class="who">${who}</div><div class="text">${linked}</div></div>`;
           })
@@ -52,7 +64,11 @@
         await fetch("/mock/slack/send", {
           method: "POST",
           headers: { "Content-Type": "application/json" },
-          body: JSON.stringify({ text: $("text").value, mention_bot: $("mention").checked }),
+          body: JSON.stringify({
+            text: $("text").value,
+            mention_bot: $("mention").checked,
+            user: $("user").value,
+          }),
         });
         poll();
       });
@@ -62,6 +78,7 @@
         render([]);
       });
 
+      loadUsers();
       poll();
       setInterval(poll, 1000);
     </script>
diff --git a/tests/e2e/tests/dashboard.spec.ts b/tests/e2e/tests/dashboard.spec.ts
index e1aa72c1..d6fa48bf 100644
--- a/tests/e2e/tests/dashboard.spec.ts
+++ b/tests/e2e/tests/dashboard.spec.ts
@@ -2,8 +2,8 @@ import { test, expect, type Page } from "@playwright/test";
 
 // Drives the REAL built ui/ app (served same-origin from the harness) for the
 // Slack → web handoff. Only the LLM/GitHub/Slack/token boundaries are faked.
-const SAME_USER = { login: "dev-user", email: "dev@example.com" };
-const OTHER_USER = { login: "someone-else", email: "someone@example.com" };
+const SAME_USER = { login: "alice", email: "alice@example.com" };
+const OTHER_USER = { login: "bob", email: "bob@example.com" };
 
 async function loginAs(page: Page, user: { login: string; email: string }) {
   const res = await page.request.post("/control/login", { data: user });
diff --git a/tests/e2e/tests/plan_review.spec.ts b/tests/e2e/tests/plan_review.spec.ts
new file mode 100644
index 00000000..006da900
--- /dev/null
+++ b/tests/e2e/tests/plan_review.spec.ts
@@ -0,0 +1,145 @@
+import {
+  test,
+  expect,
+  type APIRequestContext,
+  type Page,
+} from "@playwright/test";
+
+// Full plan-review flow, driven through the mock Slack UI + the real dashboard:
+//   user asks Open SWE in Slack to PLAN something ->
+//   agent calls enter_plan_mode, posts the plan-review link to Slack, writes the
+//   plan as a markdown file (save_plan), and posts "ready" back to Slack ->
+//   owner (user1) and a collaborator (user2) both open the plan and leave inline
+//   comments using BlockNote's native comment UI (synced live via Yjs) ->
+//   only the owner can approve -> on approval the agent implements, opens a PR,
+//   and replies in Slack with the link, having received the reviewers' comments.
+// Only the LLM is faked; all agent + dashboard code runs for real.
+
+const OWNER = { login: "alice", email: "alice@example.com" };
+const COLLABORATOR = { login: "bob", email: "bob@example.com" };
+
+async function botMessages(request: APIRequestContext): Promise<Array<string>> {
+  const res = await request.get("/mock/slack/messages");
+  const msgs = (await res.json()) as Array<{ text: string; is_bot: boolean }>;
+  return msgs.filter((m) => m.is_bot).map((m) => m.text);
+}
+
+// Create an inline comment via BlockNote's native UI: select text in the plan,
+// click "Add comment" in the formatting toolbar, type, and save.
+async function addInlineComment(page: Page, anchorText: string, comment: string) {
+  await page.locator(".bn-editor").getByText(anchorText, { exact: false }).first().selectText();
+  await page.locator('[data-test="addcomment"]').click();
+  await page.locator(".bn-comment-editor .ProseMirror").last().waitFor({ state: "visible" });
+  await page.keyboard.type(comment);
+  await page.locator('[data-test="save"]').click();
+}
+
+test.describe("Plan review (BlockNote native comments)", () => {
+  test("Slack plan request → inline comments → owner approves → PR", async ({
+    browser,
+    request,
+  }) => {
+    // 1. A user asks the bot to PLAN something in Slack.
+    await request.post("/control/reset");
+    const send = await request.post("/mock/slack/send", {
+      data: { text: "<@U0BOT> plan how to add a greet() helper", mention_bot: true },
+    });
+    const { thread_id: threadId } = (await send.json()) as { thread_id: string };
+    expect(threadId).toBeTruthy();
+    const planPath = `/agents/${threadId}/plan`;
+
+    // 1a. enter_plan_mode must actually engage, not error out. Its Command must
+    //     carry a terminating ToolMessage; without it the tool call fails and is
+    //     swallowed into an error tool message while the agent silently proceeds
+    //     as a normal run. Assert the tool's success message landed in the
+    //     thread (it wouldn't if the call had errored).
+    await expect
+      .poll(
+        async () => {
+          const res = await request.get(`/threads/${threadId}/state`);
+          const state = (await res.json()) as {
+            values?: { messages?: Array<{ content?: unknown }> };
+          };
+          return (state.values?.messages ?? [])
+            .map((m) =>
+              typeof m.content === "string" ? m.content : JSON.stringify(m.content),
+            )
+            .some((c) => c.includes("Plan mode is active"));
+        },
+        { timeout: 60_000 },
+      )
+      .toBe(true);
+
+    // 2. The agent shares the plan-review link, then announces the plan is ready.
+    await expect
+      .poll(async () => (await botMessages(request)).join("\n"), { timeout: 60_000 })
+      .toMatch(/\/agents\/[^/]+\/plan\b/);
+    await expect
+      .poll(async () => (await botMessages(request)).join("\n"), { timeout: 60_000 })
+      .toMatch(/ready for review/i);
+
+    // 3. The OWNER opens the conversation, sees the "Review plan" banner, and
+    //    follows it into the plan — which renders inside the agents shell.
+    const ownerCtx = await browser.newContext();
+    await ownerCtx.request.post("/control/login", { data: OWNER });
+    const owner = await ownerCtx.newPage();
+    await owner.goto(`/agents/${threadId}`);
+    const reviewLink = owner.getByTestId("review-plan-link");
+    await expect(reviewLink).toBeVisible({ timeout: 30_000 });
+    await reviewLink.click();
+    await expect(owner).toHaveURL(new RegExp(`/agents/${threadId}/plan$`));
+    await expect(owner.getByTestId("plan-review")).toBeVisible({ timeout: 30_000 });
+    // The agents sidebar is present (plan lives inside the shell).
+    await expect(owner.getByText("Back to conversation")).toBeVisible();
+    await expect(owner.getByTestId("plan-document")).toContainText("greet", {
+      timeout: 30_000,
+    });
+    await expect(owner.getByTestId("approve-plan")).toBeVisible();
+
+    // Owner leaves an inline comment on the plan heading (a comment wraps the
+    // text in a `.bn-thread-mark`).
+    await addInlineComment(owner, "Add greet() helper", "Owner: looks solid, ship it.");
+    await expect(owner.locator(".bn-thread-mark")).toHaveCount(1);
+
+    // 4. A COLLABORATOR opens the same plan: sees it AND the owner's comment
+    //    (synced live via Yjs), but has NO approve button.
+    const collabCtx = await browser.newContext();
+    await collabCtx.request.post("/control/login", { data: COLLABORATOR });
+    const collab = await collabCtx.newPage();
+    await collab.goto(planPath);
+    await expect(collab.getByTestId("plan-review")).toBeVisible({ timeout: 30_000 });
+    await expect(collab.getByTestId("plan-document")).toContainText("greet", {
+      timeout: 30_000,
+    });
+    await expect(collab.locator(".bn-thread-mark")).toHaveCount(1); // owner's comment, synced
+    await expect(collab.getByTestId("approve-plan")).toHaveCount(0);
+    await expect(collab.getByTestId("reject-plan")).toBeVisible();
+
+    // Collaborator leaves inline feedback on a different part of the plan.
+    await addInlineComment(
+      collab,
+      "tiny greeting helper",
+      "Reviewer: please also add a docstring.",
+    );
+    await expect(collab.locator(".bn-thread-mark")).toHaveCount(2);
+
+    // 5. The owner sees the collaborator's comment sync in, then approves.
+    await expect(owner.locator(".bn-thread-mark")).toHaveCount(2);
+    await owner.getByTestId("approve-plan").click();
+    await expect(owner.getByTestId("plan-decision")).toContainText(/implementing/i);
+
+    // 6. The agent implements, opens a PR, and links it back in the Slack thread,
+    //    echoing the reviewers' feedback it received — which proves the
+    //    collaborator's comment synced to the owner and was harvested on approve.
+    await expect
+      .poll(async () => (await botMessages(request)).join("\n"), { timeout: 90_000 })
+      .toMatch(/\/pull\//);
+    expect((await botMessages(request)).join("\n")).toMatch(/docstring/);
+
+    const prs = (await (await request.get("/mock/github/data")).json()) as Array<unknown>;
+    expect(prs.length).toBeGreaterThan(0);
+
+    await ownerCtx.close();
+    await collabCtx.close();
+  });
+});
diff --git a/tests/test_langsmith_trace_url.py b/tests/test_langsmith_trace_url.py
index 22310072..bd89ed11 100644
--- a/tests/test_langsmith_trace_url.py
+++ b/tests/test_langsmith_trace_url.py
@@ -66,3 +66,29 @@ def test_resolve_project_id_caches_success(monkeypatch: pytest.MonkeyPatch) -> N
     assert first == "pid-123"
     assert second == "pid-123"
     assert calls == [AGENT_TRACING_PROJECT]
+
+
+def test_resolve_project_id_caches_failure(monkeypatch: pytest.MonkeyPatch) -> None:
+    calls: list[str] = []
+
+    class _FakeClient:
+        def read_project(self, *, project_name: str) -> None:
+            calls.append(project_name)
+            raise RuntimeError("403 Forbidden")
+
+    monkeypatch.setattr(ls_utils, "_build_prod_langsmith_client", lambda: _FakeClient())
+
+    assert ls_utils._resolve_project_id_by_name(AGENT_TRACING_PROJECT) is None
+    assert ls_utils._resolve_project_id_by_name(AGENT_TRACING_PROJECT) is None
+    assert calls == [AGENT_TRACING_PROJECT]
+
+
+def test_trace_url_none_when_tenant_unset(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.delenv("LANGSMITH_TENANT_ID_PROD", raising=False)
+
+    def _boom() -> None:
+        raise AssertionError("must not build a client when the tenant id is unset")
+
+    monkeypatch.setattr(ls_utils, "_build_prod_langsmith_client", _boom)
+
+    assert ls_utils.get_langsmith_trace_url("t5") is None
diff --git a/tests/test_plan_mode.py b/tests/test_plan_mode.py
new file mode 100644
index 00000000..397f8d30
--- /dev/null
+++ b/tests/test_plan_mode.py
@@ -0,0 +1,223 @@
+from __future__ import annotations
+
+import asyncio
+from typing import Any
+
+import pytest
+
+from agent import server
+from agent.dashboard import thread_api
+from agent.prompt import construct_system_prompt
+
+
+def test_plan_mode_prompt_included_when_enabled() -> None:
+    prompt = construct_system_prompt(working_dir="/work", plan_mode=True)
+    assert "Plan Mode (ACTIVE)" in prompt
+    assert "read-only research-and-planning phase" in prompt
+
+
+def test_plan_mode_prompt_absent_by_default() -> None:
+    prompt = construct_system_prompt(working_dir="/work")
+    assert "Plan Mode (ACTIVE)" not in prompt
+
+
+def test_plan_mode_excluded_tools_cover_mutating_tools() -> None:
+    excluded = server.PLAN_MODE_EXCLUDED_TOOLS
+    for tool in (
+        "write_file",
+        "edit_file",
+        "task",
+        "open_pull_request",
+        "request_pr_review",
+        "linear_create_issue",
+        "linear_update_issue",
+        "linear_delete_issue",
+    ):
+        assert tool in excluded
+    # Read-only tools must stay available.
+    assert "read_file" not in excluded
+    assert "execute" not in excluded
+
+
+class _FakeThreadsClient:
+    async def create(
+        self, *, thread_id: str, metadata: dict[str, Any], if_exists: str
+    ) -> dict[str, Any]:
+        return {"thread_id": thread_id, "metadata": metadata}
+
+    async def update(self, *, thread_id: str, metadata: dict[str, Any]) -> dict[str, Any]:
+        return {"thread_id": thread_id, "metadata": metadata}
+
+    async def get(self, thread_id: str) -> dict[str, Any]:
+        return {"thread_id": thread_id, "metadata": {}}
+
+
+class _FakeRunsClient:
+    def __init__(self) -> None:
+        self.configurable: dict[str, Any] | None = None
+
+    async def create(
+        self,
+        thread_id: str,
+        assistant_id: str,
+        *,
+        input: dict[str, Any],
+        config: dict[str, Any],
+        if_not_exists: str = "reject",
+        stream_mode: list[str] | None = None,
+        stream_resumable: bool = False,
+    ) -> dict[str, str]:
+        self.configurable = config["configurable"]
+        return {"run_id": "run-id"}
+
+
+class _FakeLangGraphClient:
+    def __init__(self) -> None:
+        self.threads = _FakeThreadsClient()
+        self.runs = _FakeRunsClient()
+
+
+@pytest.fixture
+def dashboard_run_client(monkeypatch: pytest.MonkeyPatch) -> _FakeLangGraphClient:
+    client = _FakeLangGraphClient()
+
+    async def fake_get_profile(login: str) -> dict[str, Any]:
+        return {}
+
+    async def fake_ensure_token(login: str) -> None:
+        return None
+
+    async def fake_resolve_email(login: str, profile: dict[str, Any]) -> str:
+        return "octo@example.com"
+
+    monkeypatch.setattr(thread_api, "langgraph_client", lambda: client)
+    monkeypatch.setattr(thread_api, "get_profile", fake_get_profile)
+    monkeypatch.setattr(thread_api, "_ensure_dashboard_github_token", fake_ensure_token)
+    monkeypatch.setattr(thread_api, "_resolve_run_email", fake_resolve_email)
+    return client
+
+
+def _run_start_command(plan_mode: bool | None) -> dict[str, Any]:
+    configurable: dict[str, Any] = {}
+    if plan_mode is not None:
+        configurable["plan_mode"] = plan_mode
+    return {
+        "method": "run.start",
+        "params": {
+            "input": {"messages": [{"role": "user", "content": "do work"}]},
+            "config": {"configurable": configurable},
+        },
+    }
+
+
+def test_run_start_passes_plan_mode_when_enabled(
+    dashboard_run_client: _FakeLangGraphClient,
+) -> None:
+    enriched = asyncio.run(
+        thread_api._enrich_run_start_command(
+            "thread-id",
+            "octo",
+            _run_start_command(True),
+            metadata={"source": "dashboard", "github_login": "octo"},
+            creating=False,
+        )
+    )
+
+    configurable = enriched["params"]["config"]["configurable"]
+    assert configurable["plan_mode"] is True
+
+
+def test_run_start_omits_plan_mode_when_disabled(
+    dashboard_run_client: _FakeLangGraphClient,
+) -> None:
+    enriched = asyncio.run(
+        thread_api._enrich_run_start_command(
+            "thread-id",
+            "octo",
+            _run_start_command(None),
+            metadata={"source": "dashboard", "github_login": "octo"},
+            creating=False,
+        )
+    )
+
+    configurable = enriched["params"]["config"]["configurable"]
+    assert "plan_mode" not in configurable
+
+
+def test_thread_summary_reports_plan_mode() -> None:
+    summary = thread_api._thread_summary(
+        {"thread_id": "t1", "metadata": {"source": "dashboard", "plan_mode": True}}
+    )
+    assert summary["planMode"] is True
+
+    summary_off = thread_api._thread_summary(
+        {"thread_id": "t2", "metadata": {"source": "dashboard"}}
+    )
+    assert summary_off["planMode"] is False
+
+
+def test_plan_mode_guidance_section_always_present() -> None:
+    """The guidance section telling the agent about enter_plan_mode should be in every prompt."""
+    prompt = construct_system_prompt(working_dir="/work", plan_mode=False)
+    assert "enter_plan_mode" in prompt
+    assert "Plan Mode" in prompt
+
+
+def test_plan_mode_guidance_section_present_when_enabled() -> None:
+    prompt = construct_system_prompt(working_dir="/work", plan_mode=True)
+    assert "enter_plan_mode" in prompt
+    assert "Plan Mode (ACTIVE)" in prompt
+
+
+def test_enter_plan_mode_tool_returns_command() -> None:
+    from langchain_core.messages import ToolMessage
+    from langchain_core.tools import tool as as_tool
+    from langgraph.types import Command
+
+    from agent.tools.enter_plan_mode import enter_plan_mode
+
+    # Wrap as the agent does so the InjectedToolCallId is supplied from the call.
+    wrapped = as_tool(enter_plan_mode)
+    result = wrapped.invoke(
+        {"name": "enter_plan_mode", "args": {}, "id": "call-1", "type": "tool_call"}
+    )
+    assert isinstance(result, Command)
+    assert result.update["plan_mode"] is True
+    messages = result.update["messages"]
+    assert len(messages) == 1
+    assert isinstance(messages[0], ToolMessage)
+    assert messages[0].tool_call_id == "call-1"
+
+
+def test_enter_plan_mode_exported() -> None:
+    from agent.tools import enter_plan_mode
+
+    assert callable(enter_plan_mode)
+
+
+def test_build_plan_approval_blocks_has_three_buttons() -> None:
+    from agent.tools.slack_thread_reply import _build_plan_approval_blocks
+
+    blocks = _build_plan_approval_blocks("Here is my plan")
+    assert len(blocks) == 2
+    assert blocks[0]["type"] == "section"
+    actions = blocks[1]
+    assert actions["type"] == "actions"
+    elements = actions["elements"]
+    assert len(elements) == 3
+    texts = [e["text"]["text"] for e in elements]
+    assert "Approve & Implement" in texts
+    assert "Revise Plan" in texts
+    assert "Cancel" in texts
+
+
+def test_build_plan_approval_blocks_values_have_plan_approval_type() -> None:
+    import json
+
+    from agent.tools.slack_thread_reply import _build_plan_approval_blocks
+
+    blocks = _build_plan_approval_blocks("plan text")
+    for element in blocks[1]["elements"]:
+        value = json.loads(element["value"])
+        assert value["type"] == "plan_approval"
+        assert value["action"] in ("approve", "revise", "cancel")
diff --git a/tests/test_plan_review.py b/tests/test_plan_review.py
new file mode 100644
index 00000000..84ee4bb9
--- /dev/null
+++ b/tests/test_plan_review.py
@@ -0,0 +1,156 @@
+from __future__ import annotations
+
+from typing import Any
+
+import pytest
+
+
+def test_dashboard_plan_url_uses_plan_path(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv("DASHBOARD_BASE_URL", "https://example.test")
+    from agent.utils.dashboard_links import dashboard_plan_url
+
+    assert dashboard_plan_url("abc-123") == "https://example.test/agents/abc-123/plan"
+
+
+def test_dashboard_plan_url_none_without_thread() -> None:
+    from agent.utils.dashboard_links import dashboard_plan_url
+
+    assert dashboard_plan_url("") is None
+
+
+def test_format_comments_with_quote_and_author() -> None:
+    from agent.dashboard.plan_api import PlanComment, _format_comments
+
+    text = _format_comments(
+        [
+            PlanComment(author="alice", body="add a docstring", quote="def greet"),
+            PlanComment(author="bob", body="looks good", resolved=True),
+            PlanComment(author="carol", body="   "),  # blank → skipped
+        ]
+    )
+    assert 'On "def greet"' in text
+    assert "alice: add a docstring" in text
+    assert "bob (resolved): looks good" in text
+    assert "carol" not in text
+
+
+def test_format_comments_empty() -> None:
+    from agent.dashboard.plan_api import _format_comments
+
+    assert _format_comments([]) == ""
+
+
+def test_plan_decision_body_defaults() -> None:
+    from agent.dashboard.plan_api import PlanComment, PlanDecisionBody
+
+    body = PlanDecisionBody()
+    assert body.comments == []
+    comment = PlanComment(body="hi")
+    assert comment.author is None
+    assert comment.resolved is False
+
+
+def test_save_plan_requires_run_context() -> None:
+    from agent.tools.save_plan import save_plan
+
+    # No LangGraph run context → no thread_id → graceful error, not a crash.
+    result = save_plan("## Plan")
+    assert result["success"] is False
+    assert "thread_id" in result["error"]
+
+
+def test_save_plan_rejects_empty_markdown() -> None:
+    from agent.tools.save_plan import save_plan
+
+    result = save_plan("   ")
+    assert result["success"] is False
+    assert "empty" in result["error"]
+
+
+def test_plan_routes_registered() -> None:
+    from agent.webapp import app
+
+    paths = {getattr(route, "path", "") for route in app.routes}
+    assert "/dashboard/api/plan/{thread_id}" in paths
+    assert "/dashboard/api/plan/{thread_id}/approve" in paths
+    assert "/dashboard/api/plan/{thread_id}/reject" in paths
+    assert "/dashboard/api/plan/yjs/{thread_id}" in paths
+
+
+def test_save_plan_exported_and_wired() -> None:
+    from agent.tools import save_plan
+
+    assert callable(save_plan)
+
+
+def test_plan_status_constants() -> None:
+    from agent.dashboard import plan_store
+
+    assert plan_store.PLAN_STATUS_READY == "ready"
+    assert plan_store.PLAN_STATUS_PLANNING == "planning"
+    assert plan_store.PLAN_STATUS_APPROVED == "approved"
+    assert plan_store.PLAN_STATUS_REVISING == "revising"
+
+
+def test_http_request_excluded_in_plan_mode() -> None:
+    from agent.server import PLAN_MODE_EXCLUDED_TOOLS
+
+    assert "http_request" in PLAN_MODE_EXCLUDED_TOOLS
+
+
+class _FakeWS:
+    def __init__(self, origin: str | None) -> None:
+        self.headers = {"origin": origin} if origin is not None else {}
+
+
+def test_collab_origin_allowed_noop_without_allowlist(monkeypatch: pytest.MonkeyPatch) -> None:
+    from agent.dashboard.plan_collab import _origin_allowed
+
+    monkeypatch.delenv("DASHBOARD_BASE_URL", raising=False)
+    monkeypatch.delenv("DASHBOARD_ALLOWED_ORIGINS", raising=False)
+    # No configured origins (local/dev): the gate is a no-op.
+    assert _origin_allowed(_FakeWS(None)) is True
+    assert _origin_allowed(_FakeWS("https://evil.test")) is True
+
+
+def test_collab_origin_allowed_enforced_with_allowlist(monkeypatch: pytest.MonkeyPatch) -> None:
+    from agent.dashboard.plan_collab import _origin_allowed
+
+    monkeypatch.setenv("DASHBOARD_BASE_URL", "https://app.example")
+    monkeypatch.delenv("DASHBOARD_ALLOWED_ORIGINS", raising=False)
+    assert _origin_allowed(_FakeWS("https://app.example")) is True
+    assert _origin_allowed(_FakeWS("https://evil.test")) is False
+    assert _origin_allowed(_FakeWS(None)) is False
+
+
+class _FakeReq:
+    def __init__(self, tools: list[Any], state: dict[str, Any]) -> None:
+        self.tools = tools
+        self.state = state
+
+    def override(self, **kw: Any) -> _FakeReq:
+        return _FakeReq(kw.get("tools", self.tools), self.state)
+
+
+def _names(req: _FakeReq) -> set[str]:
+    return {t["name"] for t in req.tools}
+
+
+def test_plan_mode_middleware_initial_always_filters() -> None:
+    from agent.middleware import PlanModeMiddleware
+
+    mw = PlanModeMiddleware(excluded=frozenset({"write_file"}), initial=True)
+    req = _FakeReq([{"name": "read_file"}, {"name": "write_file"}], {})
+    assert _names(mw._filter(req)) == {"read_file"}
+
+
+def test_plan_mode_middleware_self_activation_via_state() -> None:
+    from agent.middleware import PlanModeMiddleware
+
+    mw = PlanModeMiddleware(excluded=frozenset({"write_file"}), initial=False)
+    # Plan mode not yet active: nothing filtered.
+    off = _FakeReq([{"name": "read_file"}, {"name": "write_file"}], {})
+    assert _names(mw._filter(off)) == {"read_file", "write_file"}
+    # After enter_plan_mode sets state: the next request is filtered.
+    on = _FakeReq([{"name": "read_file"}, {"name": "write_file"}], {"plan_mode": True})
+    assert _names(mw._filter(on)) == {"read_file"}
diff --git a/ui/bun.lock b/ui/bun.lock
index 6a5cfc04..bb46dc59 100644
--- a/ui/bun.lock
+++ b/ui/bun.lock
@@ -6,6 +6,9 @@
       "name": "open-swe-dashboard",
       "dependencies": {
         "@base-ui/react": "^1.4.1",
+        "@blocknote/core": "^0.51.4",
+        "@blocknote/mantine": "^0.51.4",
+        "@blocknote/react": "^0.51.4",
         "@fontsource-variable/inter": "^5.2.8",
         "@langchain/core": "^1.1.48",
         "@langchain/langgraph-sdk": "^1.9.21",
@@ -38,6 +41,8 @@
         "tailwindcss": "^4.2.1",
         "tw-animate-css": "^1.4.0",
         "vite-tsconfig-paths": "^5.1.4",
+        "y-websocket": "^3.0.0",
+        "yjs": "^13.6.27",
       },
       "devDependencies": {
         "@tanstack/devtools-vite": "^0.6.0",
@@ -52,7 +57,7 @@
         "prettier": "^3.8.1",
         "prettier-plugin-tailwindcss": "^0.7.2",
         "typescript": "^5.9.3",
-        "vite": "^7.3.1",
+        "vite": "^7.3.5",
         "vite-plugin-pwa": "^1.3.0",
         "vitest": "^4.1.0",
         "web-vitals": "^5.1.0",
@@ -272,6 +277,12 @@
 
     "@base-ui/utils": ["@base-ui/utils@0.2.9", "", { "dependencies": { "@babel/runtime": "^7.29.2", "@floating-ui/utils": "^0.2.11", "reselect": "^5.1.1", "use-sync-external-store": "^1.6.0" }, "peerDependencies": { "@types/react": "^17 || ^18 || ^19", "react": "^17 || ^18 || ^19", "react-dom": "^17 || ^18 || ^19" }, "optionalPeers": ["@types/react"] }, "sha512-x/PDDCYzoqPpjrdyb3VcyylTI2IjUXEtYDGi5foh7KsnmNJIIaVwA2GLgDH1dps1GgXiJbA60hM+AyuTfQzIvw=="],
 
+    "@blocknote/core": ["@blocknote/core@0.51.4", "", { "dependencies": { "@emoji-mart/data": "^1.2.1", "@handlewithcare/prosemirror-inputrules": "^0.1.4", "@shikijs/types": "^4", "@tanstack/store": "^0.7.7", "@tiptap/core": "^3.13.0", "@tiptap/extension-bold": "^3.13.0", "@tiptap/extension-code": "^3.13.0", "@tiptap/extension-horizontal-rule": "^3.13.0", "@tiptap/extension-italic": "^3.13.0", "@tiptap/extension-paragraph": "^3.13.0", "@tiptap/extension-strike": "^3.13.0", "@tiptap/extension-text": "^3.13.0", "@tiptap/extension-underline": "^3.13.0", "@tiptap/extensions": "^3.13.0", "@tiptap/pm": "^3.13.0", "emoji-mart": "^5.6.0", "fast-deep-equal": "^3.1.3", "lib0": "^0.2.99", "prosemirror-highlight": "^0.15.1", "prosemirror-model": "^1.25.4", "prosemirror-state": "^1.4.4", "prosemirror-tables": "^1.8.3", "prosemirror-transform": "^1.11.0", "prosemirror-view": "^1.41.4", "y-prosemirror": "^1.3.7", "y-protocols": "^1.0.6", "yjs": "^13.6.27" } }, "sha512-uR7/BlW6VVlCx/JzfGbkaLGz7O5uI3bu2tbNIdzGTfSloiEp8Qc14if36Dy7DDs+dVWfZgwds0jWiGfE3AzJiw=="],
+
+    "@blocknote/mantine": ["@blocknote/mantine@0.51.4", "", { "dependencies": { "@blocknote/core": "0.51.4", "@blocknote/react": "0.51.4", "react-icons": "^5.5.0" }, "peerDependencies": { "@mantine/core": "^8.3.11 || ^9.0.2", "@mantine/hooks": "^8.3.11 || ^9.0.2", "react": "^18.0 || ^19.0 || >= 19.0.0-rc", "react-dom": "^18.0 || ^19.0 || >= 19.0.0-rc" } }, "sha512-Ka7QjzhgB/T2ekwtXgwa9zIiiixAm4dob3FklJIedu+9j/eO4auokmRnWAhZQmNJsOdE7mQTUmnv6X4k/lHyCQ=="],
+
+    "@blocknote/react": ["@blocknote/react@0.51.4", "", { "dependencies": { "@blocknote/core": "0.51.4", "@emoji-mart/data": "^1.2.1", "@floating-ui/react": "^0.27.18", "@floating-ui/utils": "^0.2.10", "@tanstack/react-store": "0.7.7", "@tiptap/core": "^3.13.0", "@tiptap/pm": "^3.13.0", "@tiptap/react": "^3.13.0", "@types/use-sync-external-store": "1.5.0", "emoji-mart": "^5.6.0", "fast-deep-equal": "^3.1.3", "lodash.merge": "^4.6.2", "react-icons": "^5.5.0", "use-sync-external-store": "1.6.0" }, "peerDependencies": { "react": "^18.0 || ^19.0 || >= 19.0.0-rc", "react-dom": "^18.0 || ^19.0 || >= 19.0.0-rc" } }, "sha512-tWe039t/Gkj9YDoEXruclXQvI+toI0ctcyikbHa8dm3Q6zTgy24+T/P1t1fYSNPBkSnhq+ILz2fLLnCK994qkA=="],
+
     "@braintree/sanitize-url": ["@braintree/sanitize-url@7.1.2", "", {}, "sha512-jigsZK+sMF/cuiB7sERuo9V7N9jx+dhmHHnQyDSVdpZwVutaBu7WvNYqMDLSgFgfB30n452TP3vjDAvFC973mA=="],
 
     "@cfworker/json-schema": ["@cfworker/json-schema@4.1.1", "", {}, "sha512-gAmrUZSGtKc3AiBL71iNWxDsyUC5uMaKKGdvzYsBoTW/xi42JQHl7eKV2OYzCUqvc+D2RCcf7EXY2iCyFIk6og=="],
@@ -300,6 +311,8 @@
 
     "@emnapi/wasi-threads": ["@emnapi/wasi-threads@1.2.1", "", { "dependencies": { "tslib": "^2.4.0" } }, "sha512-uTII7OYF+/Mes/MrcIOYp5yOtSMLBWSIoLPpcgwipoiKbli6k322tcoFsxoIIxPDqW01SQGAgko4EzZi2BNv2w=="],
 
+    "@emoji-mart/data": ["@emoji-mart/data@1.2.1", "", {}, "sha512-no2pQMWiBy6gpBEiqGeU77/bFejDqUTRY7KX+0+iur13op3bqUsXdnwoZs6Xb1zbv0gAj5VvS1PWoUUckSr5Dw=="],
+
     "@esbuild/aix-ppc64": ["@esbuild/aix-ppc64@0.27.7", "", { "os": "aix", "cpu": "ppc64" }, "sha512-EKX3Qwmhz1eMdEJokhALr0YiD0lhQNwDqkPYyPhiSwKrh7/4KRjQc04sZ8db+5DVVnZ1LmbNDI1uAMPEUBnQPg=="],
 
     "@esbuild/android-arm": ["@esbuild/android-arm@0.27.7", "", { "os": "android", "cpu": "arm" }, "sha512-jbPXvB4Yj2yBV7HUfE2KHe4GJX51QplCN1pGbYjvsyCZbQmies29EoJbkEc+vYuU5o45AfQn37vZlyXy4YJ8RQ=="],
@@ -374,12 +387,16 @@
 
     "@floating-ui/dom": ["@floating-ui/dom@1.7.6", "", { "dependencies": { "@floating-ui/core": "^1.7.5", "@floating-ui/utils": "^0.2.11" } }, "sha512-9gZSAI5XM36880PPMm//9dfiEngYoC6Am2izES1FF406YFsjvyBMmeJ2g4SAju3xWwtuynNRFL2s9hgxpLI5SQ=="],
 
+    "@floating-ui/react": ["@floating-ui/react@0.27.19", "", { "dependencies": { "@floating-ui/react-dom": "^2.1.8", "@floating-ui/utils": "^0.2.11", "tabbable": "^6.0.0" }, "peerDependencies": { "react": ">=17.0.0", "react-dom": ">=17.0.0" } }, "sha512-31B8h5mm8YxotlE7/AU/PhNAl8eWxAmjL/v2QOxroDNkTFLk3Uu82u63N3b6TXa4EGJeeZLVcd/9AlNlVqzeog=="],
+
     "@floating-ui/react-dom": ["@floating-ui/react-dom@2.1.8", "", { "dependencies": { "@floating-ui/dom": "^1.7.6" }, "peerDependencies": { "react": ">=16.8.0", "react-dom": ">=16.8.0" } }, "sha512-cC52bHwM/n/CxS87FH0yWdngEZrjdtLW/qVruo68qg+prK7ZQ4YGdut2GyDVpoGeAYe/h899rVeOVm6Oi40k2A=="],
 
     "@floating-ui/utils": ["@floating-ui/utils@0.2.11", "", {}, "sha512-RiB/yIh78pcIxl6lLMG0CgBXAZ2Y0eVHqMPYugu+9U0AeT6YBeiJpf7lbdJNIugFP5SIjwNRgo4DhR1Qxi26Gg=="],
 
     "@fontsource-variable/inter": ["@fontsource-variable/inter@5.2.8", "", {}, "sha512-kOfP2D+ykbcX/P3IFnokOhVRNoTozo5/JxhAIVYLpea/UBmCQ/YWPBfWIDuBImXX/15KH+eKh4xpEUyS2sQQGQ=="],
 
+    "@handlewithcare/prosemirror-inputrules": ["@handlewithcare/prosemirror-inputrules@0.1.4", "", { "dependencies": { "prosemirror-history": "^1.4.1", "prosemirror-transform": "^1.0.0" }, "peerDependencies": { "prosemirror-model": "^1.0.0", "prosemirror-state": "^1.0.0", "prosemirror-view": "^1.0.0" } }, "sha512-GMqlBeG2MKM+tXEFd2N+wIv5z4VvJTg8JtfJUrdjvFq2W6v+AW8oTgiWyFw8L3iEQwvtQcVJxU873iB0LXUNNw=="],
+
     "@hono/node-server": ["@hono/node-server@1.19.14", "", { "peerDependencies": { "hono": "^4" } }, "sha512-GwtvgtXxnWsucXvbQXkRgqksiH2Qed37H9xHZocE5sA3N8O8O8/8FA3uclQXxXVzc9XBZuEOMK7+r02FmSpHtw=="],
 
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@@ -418,6 +435,10 @@
 
     "@langchain/react": ["@langchain/react@1.0.22", "", { "dependencies": { "@langchain/langgraph-sdk": "1.9.21" }, "peerDependencies": { "@langchain/core": "^1.1.48", "react": "^18 || ^19" } }, "sha512-e3llirWyH6RI6XoTwm7i9e7jiV3A6GDp50JCFKyo8XfZiufE6HiMzZHtpiMLkR/JezfdOTEHDyEC148C0gVB8A=="],
 
+    "@mantine/core": ["@mantine/core@8.3.18", "", { "dependencies": { "@floating-ui/react": "^0.27.16", "clsx": "^2.1.1", "react-number-format": "^5.4.4", "react-remove-scroll": "^2.7.1", "react-textarea-autosize": "8.5.9", "type-fest": "^4.41.0" }, "peerDependencies": { "@mantine/hooks": "8.3.18", "react": "^18.x || ^19.x", "react-dom": "^18.x || ^19.x" } }, "sha512-9tph1lTVogKPjTx02eUxDUOdXacPzK62UuSqb4TdGliI54/Xgxftq0Dfqu6XuhCxn9J5MDJaNiLDvL/1KRkYqA=="],
+
+    "@mantine/hooks": ["@mantine/hooks@8.3.18", "", { "peerDependencies": { "react": "^18.x || ^19.x" } }, "sha512-QoWr9+S8gg5050TQ06aTSxtlpGjYOpIllRbjYYXlRvZeTsUqiTbVfvQROLexu4rEaK+yy9Wwriwl9PMRgbLqPw=="],
+
     "@mermaid-js/parser": ["@mermaid-js/parser@1.1.1", "", { "dependencies": { "@chevrotain/types": "~11.1.1" } }, "sha512-VuHdsYMK1bT6X2JbcAaWAhugTRvRBRyuZgd+c22swUeI9g/ntaxF7CY7dYarhZovofCbUNO0G7JesfmNtjYOCw=="],
 
     "@modelcontextprotocol/sdk": ["@modelcontextprotocol/sdk@1.29.0", "", { "dependencies": { "@hono/node-server": "^1.19.9", "ajv": "^8.17.1", "ajv-formats": "^3.0.1", "content-type": "^1.0.5", "cors": "^2.8.5", "cross-spawn": "^7.0.5", "eventsource": "^3.0.2", "eventsource-parser": "^3.0.0", "express": "^5.2.1", "express-rate-limit": "^8.2.1", "hono": "^4.11.4", "jose": "^6.1.3", "json-schema-typed": "^8.0.2", "pkce-challenge": "^5.0.0", "raw-body": "^3.0.0", "zod": "^3.25 || ^4.0", "zod-to-json-schema": "^3.25.1" }, "peerDependencies": { "@cfworker/json-schema": "^4.1.1" }, "optionalPeers": ["@cfworker/json-schema"] }, "sha512-zo37mZA9hJWpULgkRpowewez1y6ML5GsXJPY8FI0tBBCd77HEvza4jDqRKOXgHNn867PVGCyTdzqpz0izu5ZjQ=="],
@@ -660,7 +681,7 @@
 
     "@tanstack/react-start-server": ["@tanstack/react-start-server@1.167.19", "", { "dependencies": { "@tanstack/react-router": "1.170.15", "@tanstack/router-core": "1.171.13", "@tanstack/start-server-core": "1.169.14" }, "peerDependencies": { "react": ">=18.0.0 || >=19.0.0", "react-dom": ">=18.0.0 || >=19.0.0" } }, "sha512-+eMpAwDreQvCwgX45MdUHTUCF/Wad36+PwQafe6W5wa3qVkGyN3P131ShGyRwT/0WwKa5EVGdW1zFgwby8UNqA=="],
 
-    "@tanstack/react-store": ["@tanstack/react-store@0.9.3", "", { "dependencies": { "@tanstack/store": "0.9.3", "use-sync-external-store": "^1.6.0" }, "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0", "react-dom": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-y2iHd/N9OkoQbFJLUX1T9vbc2O9tjH0pQRgTcx1/Nz4IlwLvkgpuglXUx+mXt0g5ZDFrEeDnONPqkbfxXJKwRg=="],
+    "@tanstack/react-store": ["@tanstack/react-store@0.7.7", "", { "dependencies": { "@tanstack/store": "0.7.7", "use-sync-external-store": "^1.5.0" }, "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0", "react-dom": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-qqT0ufegFRDGSof9D/VqaZgjNgp4tRPHZIJq2+QIHkMUtHjaJ0lYrrXjeIUJvjnTbgPfSD1XgOMEt0lmANn6Zg=="],
 
     "@tanstack/router-core": ["@tanstack/router-core@1.171.13", "", { "dependencies": { "@tanstack/history": "1.162.0", "cookie-es": "^3.0.0", "seroval": "^1.5.4", "seroval-plugins": "^1.5.4" } }, "sha512-+NOwEj1kO/6IGmpHRIZHasYxYWpyBQGNIZAST9aNrk9Q3YlU9SgqVnl1pbLa9qAKfeNdXQIRve0RQb/0kyDeDA=="],
 
@@ -684,7 +705,7 @@
 
     "@tanstack/start-storage-context": ["@tanstack/start-storage-context@1.167.15", "", { "dependencies": { "@tanstack/router-core": "1.171.13" } }, "sha512-Jy0q4vdG6pv76N92+X+ag3fuOV2zINQagYyMN1/es7tPI1vzpKECIU8AqHqzI6ahkwaph7XDvmfUkiLJ3i4LOA=="],
 
-    "@tanstack/store": ["@tanstack/store@0.9.3", "", {}, "sha512-8reSzl/qGWGGVKhBoxXPMWzATSbZLZFWhwBAFO9NAyp0TxzfBP0mIrGb8CP8KrQTmvzXlR/vFPPUrHTLBGyFyw=="],
+    "@tanstack/store": ["@tanstack/store@0.7.7", "", {}, "sha512-xa6pTan1bcaqYDS9BDpSiS63qa6EoDkPN9RsRaxHuDdVDNntzq3xNwR5YKTU/V3SkSyC9T4YVOPh2zRQN0nhIQ=="],
 
     "@tanstack/virtual-file-routes": ["@tanstack/virtual-file-routes@1.162.0", "", {}, "sha512-uhOeFyxLcU41HzvrxsGpiWdcMbScY1EDgbZ5K7DVRMYInbLYWAC0EA/kx9wXAoSM8q82bUG2hRl8+EAjE6XAbA=="],
 
@@ -692,6 +713,34 @@
 
     "@testing-library/react": ["@testing-library/react@16.3.2", "", { "dependencies": { "@babel/runtime": "^7.12.5" }, "peerDependencies": { "@testing-library/dom": "^10.0.0", "@types/react": "^18.0.0 || ^19.0.0", "@types/react-dom": "^18.0.0 || ^19.0.0", "react": "^18.0.0 || ^19.0.0", "react-dom": "^18.0.0 || ^19.0.0" }, "optionalPeers": ["@types/react", "@types/react-dom"] }, "sha512-XU5/SytQM+ykqMnAnvB2umaJNIOsLF3PVv//1Ew4CTcpz0/BRyy/af40qqrt7SjKpDdT1saBMc42CUok5gaw+g=="],
 
+    "@tiptap/core": ["@tiptap/core@3.27.1", "", { "peerDependencies": { "@tiptap/pm": "3.27.1" } }, "sha512-rV6Qn4wmC6BxfF+4mu6bqGWj9vA4oXXhsrpXaJL2uhjxeHAGofjwcHof2X84VYzeyXgdlsGmqKie4TAppVXZUQ=="],
+
+    "@tiptap/extension-bold": ["@tiptap/extension-bold@3.27.1", "", { "peerDependencies": { "@tiptap/core": "3.27.1" } }, "sha512-TlC5bsS+pqETTrlz4CZz9RO/cKBYtELGIxwtKeivUn3eNfnOxQbbu4WDsiwIfzRFyd0OMnKl6BPM2KnYEehoEQ=="],
+
+    "@tiptap/extension-bubble-menu": ["@tiptap/extension-bubble-menu@3.27.1", "", { "dependencies": { "@floating-ui/dom": "^1.0.0" }, "peerDependencies": { "@tiptap/core": "3.27.1", "@tiptap/pm": "3.27.1" } }, "sha512-j/j8Qp9Z5nViade2m7zjrO/CYH/Ca80Qj7aqo0eUaei6FZQ5izlF9o4XQU5EFMAutV6mwynsPUp8FVo5sCuYfw=="],
+
+    "@tiptap/extension-code": ["@tiptap/extension-code@3.27.1", "", { "peerDependencies": { "@tiptap/core": "3.27.1" } }, "sha512-epOUpFfEmBzjvnqvjv2qHX7NAuLo5dlOGV690lWu+sAYMjibuJBeVvAiKPyFCfRCCTUxdbDB3jbaOA1yEcEJ7w=="],
+
+    "@tiptap/extension-floating-menu": ["@tiptap/extension-floating-menu@3.27.1", "", { "peerDependencies": { "@floating-ui/dom": "^1.0.0", "@tiptap/core": "3.27.1", "@tiptap/pm": "3.27.1" } }, "sha512-BmJF1VqB7dSJkgAalrpVFj88WLhxKjcWPuWHOqf2ITrUU2832BhKLXKmxjWUy1gqV8PfNNVWtGfIERy7I0y0+Q=="],
+
+    "@tiptap/extension-horizontal-rule": ["@tiptap/extension-horizontal-rule@3.27.1", "", { "peerDependencies": { "@tiptap/core": "3.27.1", "@tiptap/pm": "3.27.1" } }, "sha512-QlKE7qn5qMnIGVGhXQlvYedvLtNJ9z0dmit5w8vPb8tKzW4Spk6M7N2kruprrDA8GBwHfeR5wmF+njfUm34qxg=="],
+
+    "@tiptap/extension-italic": ["@tiptap/extension-italic@3.27.1", "", { "peerDependencies": { "@tiptap/core": "3.27.1" } }, "sha512-jGGeyn9uRUnNjSTHpbqhiGsp6KaYTSbV09jDXPJI9cDwfV9hpugLvpaCZd0BMBbhU1B1W6kOfX0BE15qX/HQfA=="],
+
+    "@tiptap/extension-paragraph": ["@tiptap/extension-paragraph@3.27.1", "", { "peerDependencies": { "@tiptap/core": "3.27.1" } }, "sha512-7K7eo1gruOgAsnbK+GCV23AUVUI0cL1bTig8HaPneoFMVbig7vddk8jNLKBWO8TXVbG7TuHdnDN4F98vdtwh5Q=="],
+
+    "@tiptap/extension-strike": ["@tiptap/extension-strike@3.27.1", "", { "peerDependencies": { "@tiptap/core": "3.27.1" } }, "sha512-Y3DW1jlSlCNCyMGHP3+3qBNNPS83wuFz4RTYGjZtvRRTCRh7apZme9XRWMq1rN5mJ2Cr7fKocA2/5Bs13KgN6Q=="],
+
+    "@tiptap/extension-text": ["@tiptap/extension-text@3.27.1", "", { "peerDependencies": { "@tiptap/core": "3.27.1" } }, "sha512-6ZwaZwSrDh+KFFv6V1J79oO37yPs7y1bFxvk1/9Ih2rn3Xr5AWz+eMS+n8RpH3djBVVAQpdIAeYQgcn+VCSsTg=="],
+
+    "@tiptap/extension-underline": ["@tiptap/extension-underline@3.27.1", "", { "peerDependencies": { "@tiptap/core": "3.27.1" } }, "sha512-N889J4nXN/TPfVt8uF9N1A0SY82E90zwc1y26lqOcw6KWNLmQrlhMh/9OD4ikLDbekmFpOBq/UicpHf/6S8hbQ=="],
+
+    "@tiptap/extensions": ["@tiptap/extensions@3.27.1", "", { "peerDependencies": { "@tiptap/core": "3.27.1", "@tiptap/pm": "3.27.1" } }, "sha512-1Tdx9faw8k0/83V6X+xCDVhV8yElGt95JxeW3YMkKQJI56QdlPz0xOdJPlMiSGJKinPyVier+x9LJD/YZUZIaw=="],
+
+    "@tiptap/pm": ["@tiptap/pm@3.27.1", "", { "dependencies": { "prosemirror-changeset": "^2.3.0", "prosemirror-commands": "^1.6.2", "prosemirror-dropcursor": "^1.8.1", "prosemirror-gapcursor": "^1.3.2", "prosemirror-history": "^1.4.1", "prosemirror-inputrules": "^1.4.0", "prosemirror-keymap": "^1.2.3", "prosemirror-model": "^1.25.7", "prosemirror-schema-list": "^1.5.0", "prosemirror-state": "^1.4.4", "prosemirror-tables": "^1.8.0", "prosemirror-transform": "^1.12.0", "prosemirror-view": "^1.41.8" } }, "sha512-Ffjx+vimmBU7zH/KrpXzJid3+pziCe/VL2aexSTP63cyQwKQ65LkFkCKaIsSpFdQQuakVZBGWjCA5RoBV852pw=="],
+
+    "@tiptap/react": ["@tiptap/react@3.27.1", "", { "dependencies": { "@types/use-sync-external-store": "^0.0.6", "fast-equals": "^5.3.3", "use-sync-external-store": "^1.4.0" }, "optionalDependencies": { "@tiptap/extension-bubble-menu": "^3.27.1", "@tiptap/extension-floating-menu": "^3.27.1" }, "peerDependencies": { "@tiptap/core": "3.27.1", "@tiptap/pm": "3.27.1", "@types/react": "^17.0.0 || ^18.0.0 || ^19.0.0", "@types/react-dom": "^17.0.0 || ^18.0.0 || ^19.0.0", "react": "^17.0.0 || ^18.0.0 || ^19.0.0", "react-dom": "^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-/Wn2fc9zMtX08MXYScDFsm4wJ8lzfhfPEdbtls7WCDlbtrop48PWlkHDBBJrywARfAQTB2mFs9KiFy9yrQm5Lg=="],
+
     "@trickfilm400/rollup-plugin-off-main-thread": ["@trickfilm400/rollup-plugin-off-main-thread@3.0.0-pre1", "", { "dependencies": { "ejs": "^3.1.10", "json5": "^2.2.3", "magic-string": "^0.30.21", "string.prototype.matchall": "^4.0.12" } }, "sha512-/67zpWDBLV+oYAEL682s1ktXL0HgqX76f6gaVGkGnVZlBbm1zd0v4Bz8MFF2GGhoX9rvfq3KSQHubFHwa6w6/Q=="],
 
     "@ts-morph/common": ["@ts-morph/common@0.27.0", "", { "dependencies": { "fast-glob": "^3.3.3", "minimatch": "^10.0.1", "path-browserify": "^1.0.1" } }, "sha512-Wf29UqxWDpc+i61k3oIOzcUfQt79PIT9y/MWfAGlrkjg6lBC1hwDECLXPVJAhWjiGbfBCxZd65F/LIZF3+jeJQ=="],
@@ -804,6 +853,8 @@
 
     "@types/unist": ["@types/unist@3.0.3", "", {}, "sha512-ko/gIFJRv177XgZsZcBwnqJN5x/Gien8qNOn0D5bQU/zAzVf9Zt3BlcUiLqhV9y4ARk0GbT3tnUiPNgnTXzc/Q=="],
 
+    "@types/use-sync-external-store": ["@types/use-sync-external-store@1.5.0", "", {}, "sha512-5dyB8nLC/qogMrlCizZnYWQTA4lnb/v+It+sqNl5YnSRAPMlIqY/X0Xn+gZw8vOL+TgTTr28VEbn3uf8fUtAkw=="],
+
     "@types/validate-npm-package-name": ["@types/validate-npm-package-name@4.0.2", "", {}, "sha512-lrpDziQipxCEeK5kWxvljWYhUvOiB2A9izZd9B2AFarYAkqZshb4lPbRs7zKEic6eGtH8V/2qJW+dPp9OtF6bw=="],
 
     "@typescript-eslint/eslint-plugin": ["@typescript-eslint/eslint-plugin@8.61.0", "", { "dependencies": { "@eslint-community/regexpp": "^4.12.2", "@typescript-eslint/scope-manager": "8.61.0", "@typescript-eslint/type-utils": "8.61.0", "@typescript-eslint/utils": "8.61.0", "@typescript-eslint/visitor-keys": "8.61.0", "ignore": "^7.0.5", "natural-compare": "^1.4.0", "ts-api-utils": "^2.5.0" }, "peerDependencies": { "@typescript-eslint/parser": "^8.61.0", "eslint": "^8.57.0 || ^9.0.0 || ^10.0.0", "typescript": ">=4.8.4 <6.1.0" } }, "sha512-bFNvl9ZczlVb+wR2Akszf3gHfKVj/8WanXaGJ3UstTA7brNKg0cNdk6X1Psu5V7MZ2oQtzZKOEzIUehaoxbDGw=="],
@@ -1158,6 +1209,8 @@
 
     "detect-libc": ["detect-libc@2.1.2", "", {}, "sha512-Btj2BOOO83o3WyH59e8MgXsxEQVcarkUOpEYrubB0urwnN10yQ364rsiByU11nZlqWYZm05i/of7io4mzihBtQ=="],
 
+    "detect-node-es": ["detect-node-es@1.1.0", "", {}, "sha512-ypdmJU/TbBby2Dxibuv7ZLW3Bs1QEmM7nHjEANfohJLvE0XVujisn1qPJcZxg+qDucsr+bP6fLD1rPS3AhJ7EQ=="],
+
     "devlop": ["devlop@1.1.0", "", { "dependencies": { "dequal": "^2.0.0" } }, "sha512-RWmIqhcFf1lRYBvNmr7qTNuyCt/7/ns2jbpp1+PalgE/rDQcBT0fioSMUpJ93irlUhC5hrg4cYqe6U+0ImW0rA=="],
 
     "diff": ["diff@8.0.3", "", {}, "sha512-qejHi7bcSD4hQAZE0tNAawRK1ZtafHDmMTMkrrIGgSLl7hTnQHmKCeB45xAcbfTqK2zowkM3j3bHt/4b/ARbYQ=="],
@@ -1178,6 +1231,8 @@
 
     "electron-to-chromium": ["electron-to-chromium@1.5.371", "", {}, "sha512-e9htk9mAYL6AzmkEhSvVVw7IWGSBJ/Bqdn2eRyRLrj1g6sncN4WbFt5qnILYoCktktr45pyjIrOiRvBThQ808w=="],
 
+    "emoji-mart": ["emoji-mart@5.6.0", "", {}, "sha512-eJp3QRe79pjwa+duv+n7+5YsNhRcMl812EcFVwrnRvYKoNPoQb5qxU8DG6Bgwji0akHdp6D4Ln6tYLG58MFSow=="],
+
     "emoji-regex": ["emoji-regex@10.6.0", "", {}, "sha512-toUI84YS5YmxW219erniWD0CIVOo46xGKColeNQRgOzDorgBi1v4D71/OFzgD9GO2UGKIv1C3Sp8DAn0+j5w7A=="],
 
     "encodeurl": ["encodeurl@2.0.0", "", {}, "sha512-Q0n9HRi4m6JuGIV1eFlmvJB7ZEVxu93IrMyiMsGC0lrMJMWzRgx6WGquyfQgZVb31vhGgXnfmPNNXmxnOkRBrg=="],
@@ -1274,6 +1329,8 @@
 
     "fast-deep-equal": ["fast-deep-equal@3.1.3", "", {}, "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q=="],
 
+    "fast-equals": ["fast-equals@5.4.0", "", {}, "sha512-jt2DW/aNFNwke7AUd+Z+e6pz39KO5rzdbbFCg2sGafS4mk13MI7Z8O5z9cADNn5lhGODIgLwug6TZO2ctf7kcw=="],
+
     "fast-glob": ["fast-glob@3.3.3", "", { "dependencies": { "@nodelib/fs.stat": "^2.0.2", "@nodelib/fs.walk": "^1.2.3", "glob-parent": "^5.1.2", "merge2": "^1.3.0", "micromatch": "^4.0.8" } }, "sha512-7MptL8U0cqcFdzIzwOTHoilX9x5BrNqye7Z/LuC7kCMRio1EMSyqRK3BEAUD7sXRq4iT4AzTVuZdhgQ2TCvYLg=="],
 
     "fast-json-stable-stringify": ["fast-json-stable-stringify@2.1.0", "", {}, "sha512-lhd/wF+Lk98HZoTCtlVraHtfh5XYijIjalXck7saUtuanSDyLMxnHhSXEDJqHxD7msR8D0uCmqlkwjCV8xvwHw=="],
@@ -1336,6 +1393,8 @@
 
     "get-intrinsic": ["get-intrinsic@1.3.0", "", { "dependencies": { "call-bind-apply-helpers": "^1.0.2", "es-define-property": "^1.0.1", "es-errors": "^1.3.0", "es-object-atoms": "^1.1.1", "function-bind": "^1.1.2", "get-proto": "^1.0.1", "gopd": "^1.2.0", "has-symbols": "^1.1.0", "hasown": "^2.0.2", "math-intrinsics": "^1.1.0" } }, "sha512-9fSjSaos/fRIVIp+xSJlE6lfwhES7LNtKaCBIamHsjr2na1BiABJPo0mOjjz8GJDURarmCPGqaiVg5mfjb98CQ=="],
 
+    "get-nonce": ["get-nonce@1.0.1", "", {}, "sha512-FJhYRoDaiatfEkUK8HKlicmu/3SGFD51q3itKDGoSTysQJBnfOcxU5GxnhE1E6soB76MbT0MBtnKJuXyAx+96Q=="],
+
     "get-own-enumerable-keys": ["get-own-enumerable-keys@1.0.0", "", {}, "sha512-PKsK2FSrQCyxcGHsGrLDcK0lx+0Ke+6e8KFFozA9/fIQLhQzPaRvJFdcz7+Axg3jUH/Mq+NI4xa5u/UT2tQskA=="],
 
     "get-own-enumerable-property-symbols": ["get-own-enumerable-property-symbols@3.0.2", "", {}, "sha512-I0UBV/XOz1XkIJHEUDMZAbzCThU/H8DxmSfmdGcKPnVhu2VfFqr34jr9777IyaTYvxjedWhqVIilEDsCdP5G6g=="],
@@ -1538,6 +1597,8 @@
 
     "isexe": ["isexe@3.1.5", "", {}, "sha512-6B3tLtFqtQS4ekarvLVMZ+X+VlvQekbe4taUkf/rhVO3d/h0M2rfARm/pXLcPEsjjMsFgrFgSrhQIxcSVrBz8w=="],
 
+    "isomorphic.js": ["isomorphic.js@0.2.5", "", {}, "sha512-PIeMbHqMt4DnUP3MA/Flc0HElYjMXArsw1qwJZcm9sqR8mq3l8NYizFMty0pWwE/tzIGH3EKK5+jes5mAr85yw=="],
+
     "jackspeak": ["jackspeak@4.2.3", "", { "dependencies": { "@isaacs/cliui": "^9.0.0" } }, "sha512-ykkVRwrYvFm1nb2AJfKKYPr0emF6IiXDYUaFx4Zn9ZuIH7MrzEZ3sD5RlqGXNRpHtvUHJyOnCEFxOlNDtGo7wg=="],
 
     "jake": ["jake@10.9.4", "", { "dependencies": { "async": "^3.2.6", "filelist": "^1.0.4", "picocolors": "^1.1.1" }, "bin": { "jake": "bin/cli.js" } }, "sha512-wpHYzhxiVQL+IV05BLE2Xn34zW1S223hvjtqk0+gsPrwd/8JNLXJgZZM/iPFsYc1xyphF+6M6EvdE5E9MBGkDA=="],
@@ -1590,6 +1651,8 @@
 
     "levn": ["levn@0.4.1", "", { "dependencies": { "prelude-ls": "^1.2.1", "type-check": "~0.4.0" } }, "sha512-+bT2uH4E5LGE7h/n3evcS/sQlJXCpIp6ym8OWJ5eV6+67Dsql/LaaT7qJBAt2rzfoa/5QBGBhxDix1dMt2kQKQ=="],
 
+    "lib0": ["lib0@0.2.117", "", { "dependencies": { "isomorphic.js": "^0.2.4" }, "bin": { "0serve": "bin/0serve.js", "0gentesthtml": "bin/gentesthtml.js", "0ecdsa-generate-keypair": "bin/0ecdsa-generate-keypair.js" } }, "sha512-DeXj9X5xDCjgKLU/7RR+/HQEVzuuEUiwldwOGsHK/sfAfELGWEyTcf0x+uOvCvK3O2zPmZePXWL85vtia6GyZw=="],
+
     "lightningcss": ["lightningcss@1.32.0", "", { "dependencies": { "detect-libc": "^2.0.3" }, "optionalDependencies": { "lightningcss-android-arm64": "1.32.0", "lightningcss-darwin-arm64": "1.32.0", "lightningcss-darwin-x64": "1.32.0", "lightningcss-freebsd-x64": "1.32.0", "lightningcss-linux-arm-gnueabihf": "1.32.0", "lightningcss-linux-arm64-gnu": "1.32.0", "lightningcss-linux-arm64-musl": "1.32.0", "lightningcss-linux-x64-gnu": "1.32.0", "lightningcss-linux-x64-musl": "1.32.0", "lightningcss-win32-arm64-msvc": "1.32.0", "lightningcss-win32-x64-msvc": "1.32.0" } }, "sha512-NXYBzinNrblfraPGyrbPoD19C1h9lfI/1mzgWYvXUTe414Gz/X1FD2XBZSZM7rRTrMA8JL3OtAaGifrIKhQ5yQ=="],
 
     "lightningcss-android-arm64": ["lightningcss-android-arm64@1.32.0", "", { "os": "android", "cpu": "arm64" }, "sha512-YK7/ClTt4kAK0vo6w3X+Pnm0D2cf2vPHbhOXdoNti1Ga0al1P4TBZhwjATvjNwLEBCnKvjJc2jQgHXH0NEwlAg=="],
@@ -1622,6 +1685,8 @@
 
     "lodash.debounce": ["lodash.debounce@4.0.8", "", {}, "sha512-FT1yDzDYEoYWhnSGnpE/4Kj1fLZkDFyqRb7fNt6FdYOSxlUWAtp42Eh6Wb0rGIv/m9Bgo7x4GhQbm5Ys4SG5ow=="],
 
+    "lodash.merge": ["lodash.merge@4.6.2", "", {}, "sha512-0KpjqXRVvrYyCsX1swR/XTK0va6VQkQM6MNo7PqW77ByjAhoARA8EfrP1N4+KlKj8YS0ZUCtRT/YUuhyYDujIQ=="],
+
     "lodash.sortby": ["lodash.sortby@4.7.0", "", {}, "sha512-HDWXG8isMntAyRF5vZ7xKuEvOhT4AhlRt/3czTSjvGUxjYCBVRQY48ViDHyfYz9VIoBkW4TMGQNapx+l3RUwdA=="],
 
     "log-symbols": ["log-symbols@6.0.0", "", { "dependencies": { "chalk": "^5.3.0", "is-unicode-supported": "^1.3.0" } }, "sha512-i24m8rpwhmPIS4zscNzK6MSEhk0DUWa/8iYQWxhffV8jkI4Phvs3F+quL5xvS0gdQR0FyTCMMH33Y78dDTzzIw=="],
@@ -1818,6 +1883,8 @@
 
     "ora": ["ora@8.2.0", "", { "dependencies": { "chalk": "^5.3.0", "cli-cursor": "^5.0.0", "cli-spinners": "^2.9.2", "is-interactive": "^2.0.0", "is-unicode-supported": "^2.0.0", "log-symbols": "^6.0.0", "stdin-discarder": "^0.2.2", "string-width": "^7.2.0", "strip-ansi": "^7.1.0" } }, "sha512-weP+BZ8MVNnlCm8c0Qdc1WSWq4Qn7I+9CJGm7Qali6g44e/PUzbjNqJX5NJ9ljlNMosfJvg1fKEGILklK9cwnw=="],
 
+    "orderedmap": ["orderedmap@2.1.1", "", {}, "sha512-TvAWxi0nDe1j/rtMcWcIj94+Ffe6n7zhow33h40SKxmsmozs6dz/e+EajymfoFcHd7sxNn8yHM8839uixMOV6g=="],
+
     "own-keys": ["own-keys@1.0.1", "", { "dependencies": { "get-intrinsic": "^1.2.6", "object-keys": "^1.1.1", "safe-push-apply": "^1.0.0" } }, "sha512-qFOyK5PjiWZd+QQIh+1jhdb9LpxTF0qs7Pm8o5QHYZ0M3vKqSqzsZaEB6oWlxZ+q2sJBMI/Ktgd2N5ZwQoRHfg=="],
 
     "p-finally": ["p-finally@1.0.0", "", {}, "sha512-LICb2p9CB7FS+0eR1oqWnHhp0FljGLZCWBE9aix0Uye9W8LTQPwMTYVGWQWIw9RdQiDg4+epXQODwIYJtSJaow=="],
@@ -1902,6 +1969,34 @@
 
     "property-information": ["property-information@7.2.0", "", {}, "sha512-IAtzIB6sUiWaJYrX9smp3V46pBGbBeLFRGdh25kg1334VcBlD8HzhPeNIWQH9zhGmo2itIe25EHt9dQP7G5hmg=="],
 
+    "prosemirror-changeset": ["prosemirror-changeset@2.4.1", "", { "dependencies": { "prosemirror-transform": "^1.0.0" } }, "sha512-96WBLhOaYhJ+kPhLg3uW359Tz6I/MfcrQfL4EGv4SrcqKEMC1gmoGrXHecPE8eOwTVCJ4IwgfzM8fFad25wNfw=="],
+
+    "prosemirror-commands": ["prosemirror-commands@1.7.1", "", { "dependencies": { "prosemirror-model": "^1.0.0", "prosemirror-state": "^1.0.0", "prosemirror-transform": "^1.10.2" } }, "sha512-rT7qZnQtx5c0/y/KlYaGvtG411S97UaL6gdp6RIZ23DLHanMYLyfGBV5DtSnZdthQql7W+lEVbpSfwtO8T+L2w=="],
+
+    "prosemirror-dropcursor": ["prosemirror-dropcursor@1.8.2", "", { "dependencies": { "prosemirror-state": "^1.0.0", "prosemirror-transform": "^1.1.0", "prosemirror-view": "^1.1.0" } }, "sha512-CCk6Gyx9+Tt2sbYk5NK0nB1ukHi2ryaRgadV/LvyNuO3ena1payM2z6Cg0vO1ebK8cxbzo41ku2DE5Axj1Zuiw=="],
+
+    "prosemirror-gapcursor": ["prosemirror-gapcursor@1.4.1", "", { "dependencies": { "prosemirror-keymap": "^1.0.0", "prosemirror-model": "^1.0.0", "prosemirror-state": "^1.0.0", "prosemirror-view": "^1.0.0" } }, "sha512-pMdYaEnjNMSwl11yjEGtgTmLkR08m/Vl+Jj443167p9eB3HVQKhYCc4gmHVDsLPODfZfjr/MmirsdyZziXbQKw=="],
+
+    "prosemirror-highlight": ["prosemirror-highlight@0.15.2", "", { "peerDependencies": { "@lezer/common": "^1.0.0", "@lezer/highlight": "^1.0.0", "@shikijs/types": "^1.29.2 || ^2.0.0 || ^3.0.0 || ^4.0.0", "@types/hast": "^3.0.0", "highlight.js": "^11.9.0", "lowlight": "^3.1.0", "prosemirror-model": "^1.19.3", "prosemirror-state": "^1.4.3", "prosemirror-transform": "^1.8.0", "prosemirror-view": "^1.32.4", "refractor": "^5.0.0", "sugar-high": "^0.6.1 || ^0.7.0 || ^0.8.0 || ^0.9.0 || ^1.0.0" }, "optionalPeers": ["@lezer/common", "@lezer/highlight", "@shikijs/types", "@types/hast", "highlight.js", "lowlight", "prosemirror-model", "prosemirror-state", "prosemirror-transform", "prosemirror-view", "refractor", "sugar-high"] }, "sha512-G5Wn4kn+MZMus/7vSh4ZNsC+3yrMpjKsgV6QKKYfwKOPMknRX+3H6FWr+E+Qji4xhmkqdXiToG1VTQ2bZn5b0w=="],
+
+    "prosemirror-history": ["prosemirror-history@1.5.0", "", { "dependencies": { "prosemirror-state": "^1.2.2", "prosemirror-transform": "^1.0.0", "prosemirror-view": "^1.31.0", "rope-sequence": "^1.3.0" } }, "sha512-zlzTiH01eKA55UAf1MEjtssJeHnGxO0j4K4Dpx+gnmX9n+SHNlDqI2oO1Kv1iPN5B1dm5fsljCfqKF9nFL6HRg=="],
+
+    "prosemirror-inputrules": ["prosemirror-inputrules@1.5.1", "", { "dependencies": { "prosemirror-state": "^1.0.0", "prosemirror-transform": "^1.0.0" } }, "sha512-7wj4uMjKaXWAQ1CDgxNzNtR9AlsuwzHfdFH1ygEHA2KHF2DOEaXl1CJfNPAKCg9qNEh4rum975QLaCiQPyY6Fw=="],
+
+    "prosemirror-keymap": ["prosemirror-keymap@1.2.3", "", { "dependencies": { "prosemirror-state": "^1.0.0", "w3c-keyname": "^2.2.0" } }, "sha512-4HucRlpiLd1IPQQXNqeo81BGtkY8Ai5smHhKW9jjPKRc2wQIxksg7Hl1tTI2IfT2B/LgX6bfYvXxEpJl7aKYKw=="],
+
+    "prosemirror-model": ["prosemirror-model@1.25.9", "", { "dependencies": { "orderedmap": "^2.0.0" } }, "sha512-pRTklkDDMMRopyoAcrr9wV/8g/RYgrLHBuJAb5hlEuYZRdm5yqmPjWId83fpBwPpSFqEdja0H7Dfd7z1X/npcA=="],
+
+    "prosemirror-schema-list": ["prosemirror-schema-list@1.5.1", "", { "dependencies": { "prosemirror-model": "^1.0.0", "prosemirror-state": "^1.0.0", "prosemirror-transform": "^1.7.3" } }, "sha512-927lFx/uwyQaGwJxLWCZRkjXG0p48KpMj6ueoYiu4JX05GGuGcgzAy62dfiV8eFZftgyBUvLx76RsMe20fJl+Q=="],
+
+    "prosemirror-state": ["prosemirror-state@1.4.4", "", { "dependencies": { "prosemirror-model": "^1.0.0", "prosemirror-transform": "^1.0.0", "prosemirror-view": "^1.27.0" } }, "sha512-6jiYHH2CIGbCfnxdHbXZ12gySFY/fz/ulZE333G6bPqIZ4F+TXo9ifiR86nAHpWnfoNjOb3o5ESi7J8Uz1jXHw=="],
+
+    "prosemirror-tables": ["prosemirror-tables@1.8.5", "", { "dependencies": { "prosemirror-keymap": "^1.2.3", "prosemirror-model": "^1.25.4", "prosemirror-state": "^1.4.4", "prosemirror-transform": "^1.10.5", "prosemirror-view": "^1.41.4" } }, "sha512-V/0cDCsHKHe/tfWkeCmthNUcEp1IVO3p6vwN8XtwE9PZQLAZJigbw3QoraAdfJPir4NKJtNvOB8oYGKRl+t0Dw=="],
+
+    "prosemirror-transform": ["prosemirror-transform@1.12.0", "", { "dependencies": { "prosemirror-model": "^1.21.0" } }, "sha512-GxboyN4AMIsoHNtz5uf2r2Ru551i5hWeCMD6E2Ib4Eogqoub0NflniaBPVQ4MrGE5yZ8JV9tUHg9qcZTTrcN4w=="],
+
+    "prosemirror-view": ["prosemirror-view@1.41.9", "", { "dependencies": { "prosemirror-model": "^1.25.8", "prosemirror-state": "^1.0.0", "prosemirror-transform": "^1.1.0" } }, "sha512-clTunTX+eaLbr87L1V1QPheRlEQJyTlL3gXe9x3jQIk3rL0RVWxviDGz8tFaydwIVm+hKhYCyr+R/zBtWr9s6A=="],
+
     "proxy-addr": ["proxy-addr@2.0.7", "", { "dependencies": { "forwarded": "0.2.0", "ipaddr.js": "1.9.1" } }, "sha512-llQsMLSUDUPT44jdrU/O37qlnifitDP+ZwrmmZcoSKyLKvtZxpyV0n2/bD/N4tBAAZ/gJEdZU7KMraoK1+XYAg=="],
 
     "punycode": ["punycode@2.3.1", "", {}, "sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg=="],
@@ -1922,8 +2017,18 @@
 
     "react-is": ["react-is@17.0.2", "", {}, "sha512-w2GsyukL62IJnlaff/nRegPQR94C/XXamvMWmSHRJ4y7Ts/4ocGRmTHvOs8PSE6pB3dWOrD/nueuU5sduBsQ4w=="],
 
+    "react-number-format": ["react-number-format@5.4.5", "", { "peerDependencies": { "react": "^0.14 || ^15.0.0 || ^16.0.0 || ^17.0.0 || ^18.0.0 || ^19.0.0", "react-dom": "^0.14 || ^15.0.0 || ^16.0.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-y8O2yHHj3w0aE9XO8d2BCcUOOdQTRSVq+WIuMlLVucAm5XNjJAy+BoOJiuQMldVYVOKTMyvVNfnbl2Oqp+YxGw=="],
+
     "react-refresh": ["react-refresh@0.18.0", "", {}, "sha512-QgT5//D3jfjJb6Gsjxv0Slpj23ip+HtOpnNgnb2S5zU3CB26G/IDPGoy4RJB42wzFE46DRsstbW6tKHoKbhAxw=="],
 
+    "react-remove-scroll": ["react-remove-scroll@2.7.2", "", { "dependencies": { "react-remove-scroll-bar": "^2.3.7", "react-style-singleton": "^2.2.3", "tslib": "^2.1.0", "use-callback-ref": "^1.3.3", "use-sidecar": "^1.1.3" }, "peerDependencies": { "@types/react": "*", "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0 || ^19.0.0-rc" }, "optionalPeers": ["@types/react"] }, "sha512-Iqb9NjCCTt6Hf+vOdNIZGdTiH1QSqr27H/Ek9sv/a97gfueI/5h1s3yRi1nngzMUaOOToin5dI1dXKdXiF+u0Q=="],
+
+    "react-remove-scroll-bar": ["react-remove-scroll-bar@2.3.8", "", { "dependencies": { "react-style-singleton": "^2.2.2", "tslib": "^2.0.0" }, "peerDependencies": { "@types/react": "*", "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" }, "optionalPeers": ["@types/react"] }, "sha512-9r+yi9+mgU33AKcj6IbT9oRCO78WriSj6t/cF8DWBZJ9aOGPOTEDvdUDz1FwKim7QXWwmHqtdHnRJfhAxEG46Q=="],
+
+    "react-style-singleton": ["react-style-singleton@2.2.3", "", { "dependencies": { "get-nonce": "^1.0.0", "tslib": "^2.0.0" }, "peerDependencies": { "@types/react": "*", "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0 || ^19.0.0-rc" }, "optionalPeers": ["@types/react"] }, "sha512-b6jSvxvVnyptAiLjbkWLE/lOnR4lfTtDAl+eUC7RZy+QQWc6wRzIV2CE6xBuMmDxc2qIihtDCZD5NPOFl7fRBQ=="],
+
+    "react-textarea-autosize": ["react-textarea-autosize@8.5.9", "", { "dependencies": { "@babel/runtime": "^7.20.13", "use-composed-ref": "^1.3.0", "use-latest": "^1.2.1" }, "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-U1DGlIQN5AwgjTyOEnI1oCcMuEr1pv1qOtklB2l4nyMGbHzWrI0eFsYK0zos2YWqAolJyG0IWJaqWmWj5ETh0A=="],
+
     "readdirp": ["readdirp@5.0.0", "", {}, "sha512-9u/XQ1pvrQtYyMpZe7DXKv2p5CNvyVwzUB6uhLAnQwHMSgKMBR62lc7AHljaeteeHXn11XTAaLLUVZYVZyuRBQ=="],
 
     "recast": ["recast@0.23.11", "", { "dependencies": { "ast-types": "^0.16.1", "esprima": "~4.0.0", "source-map": "~0.6.1", "tiny-invariant": "^1.3.3", "tslib": "^2.0.1" } }, "sha512-YTUo+Flmw4ZXiWfQKGcwwc11KnoRAYgzAE2E7mXKCjSviTKShtxBsN6YUUBB2gtaBzKzeKunxhUwNHQuRryhWA=="],
@@ -1984,6 +2089,8 @@
 
     "rollup": ["rollup@4.61.1", "", { "dependencies": { "@types/estree": "1.0.9" }, "optionalDependencies": { "@rollup/rollup-android-arm-eabi": "4.61.1", "@rollup/rollup-android-arm64": "4.61.1", "@rollup/rollup-darwin-arm64": "4.61.1", "@rollup/rollup-darwin-x64": "4.61.1", "@rollup/rollup-freebsd-arm64": "4.61.1", "@rollup/rollup-freebsd-x64": "4.61.1", "@rollup/rollup-linux-arm-gnueabihf": "4.61.1", "@rollup/rollup-linux-arm-musleabihf": "4.61.1", "@rollup/rollup-linux-arm64-gnu": "4.61.1", "@rollup/rollup-linux-arm64-musl": "4.61.1", "@rollup/rollup-linux-loong64-gnu": "4.61.1", "@rollup/rollup-linux-loong64-musl": "4.61.1", "@rollup/rollup-linux-ppc64-gnu": "4.61.1", "@rollup/rollup-linux-ppc64-musl": "4.61.1", "@rollup/rollup-linux-riscv64-gnu": "4.61.1", "@rollup/rollup-linux-riscv64-musl": "4.61.1", "@rollup/rollup-linux-s390x-gnu": "4.61.1", "@rollup/rollup-linux-x64-gnu": "4.61.1", "@rollup/rollup-linux-x64-musl": "4.61.1", "@rollup/rollup-openbsd-x64": "4.61.1", "@rollup/rollup-openharmony-arm64": "4.61.1", "@rollup/rollup-win32-arm64-msvc": "4.61.1", "@rollup/rollup-win32-ia32-msvc": "4.61.1", "@rollup/rollup-win32-x64-gnu": "4.61.1", "@rollup/rollup-win32-x64-msvc": "4.61.1", "fsevents": "~2.3.2" }, "bin": { "rollup": "dist/bin/rollup" } }, "sha512-I4KW6iuRpuu2uHBLraZ1wNZe0DP7lnRha+VJ9tNaYVaVgKhW0aI3h4RYnoRPeql0flHm/Co55b7snEDcOfOJrA=="],
 
+    "rope-sequence": ["rope-sequence@1.3.4", "", {}, "sha512-UT5EDe2cu2E/6O4igUr5PSFs23nvvukicWHx6GnOPlHAiiYbzNuCRQCuiUdHJQcqKalLKlrYJnjY0ySGsXNQXQ=="],
+
     "rou3": ["rou3@0.8.1", "", {}, "sha512-ePa+XGk00/3HuCqrEnK3LxJW7I0SdNg6EFzKUJG73hMAdDcOUC/i/aSz7LSDwLrGr33kal/rqOGydzwl6U7zBA=="],
 
     "roughjs": ["roughjs@4.6.6", "", { "dependencies": { "hachure-fill": "^0.5.2", "path-data-parser": "^0.1.0", "points-on-curve": "^0.2.0", "points-on-path": "^0.2.1" } }, "sha512-ZUz/69+SYpFN/g/lUlo2FXcIjRkSu3nDarreVdGGndHEBJ6cXPdKguS8JGxwj5HA5xIbVKSmLgr5b3AWxtRfvQ=="],
@@ -2114,6 +2221,8 @@
 
     "symbol-tree": ["symbol-tree@3.2.4", "", {}, "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw=="],
 
+    "tabbable": ["tabbable@6.5.0", "", {}, "sha512-wieBHXygIm7OyQOu5hQlkk62/WyCFYGlWg7L6/ZCUZwx0o398Zkn4pVmMyfYhfMG8kGrj/Krt8eIk6UKC6VzwA=="],
+
     "tailwind-merge": ["tailwind-merge@3.6.0", "", {}, "sha512-uxL7qAVQriqRQPAyK3pj66VqskWqoZ37PW94jwOTwNfq/z9oyu1V+eqrZqtR2+fCiXdYOZe/Modt8GtvqNzu+w=="],
 
     "tailwindcss": ["tailwindcss@4.3.0", "", {}, "sha512-y6nxMGB1nMW9R6k96e5gdIFzcfL/gTJRNaqGes1YvkLnPVXzWgbqFF2yLC0T8G774n24cx3Pe8XrKoniCOAH+Q=="],
@@ -2234,6 +2343,16 @@
 
     "uri-js": ["uri-js@4.4.1", "", { "dependencies": { "punycode": "^2.1.0" } }, "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg=="],
 
+    "use-callback-ref": ["use-callback-ref@1.3.3", "", { "dependencies": { "tslib": "^2.0.0" }, "peerDependencies": { "@types/react": "*", "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0 || ^19.0.0-rc" }, "optionalPeers": ["@types/react"] }, "sha512-jQL3lRnocaFtu3V00JToYz/4QkNWswxijDaCVNZRiRTO3HQDLsdu1ZtmIUvV4yPp+rvWm5j0y0TG/S61cuijTg=="],
+
+    "use-composed-ref": ["use-composed-ref@1.4.0", "", { "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-djviaxuOOh7wkj0paeO1Q/4wMZ8Zrnag5H6yBvzN7AKKe8beOaED9SF5/ByLqsku8NP4zQqsvM2u3ew/tJK8/w=="],
+
+    "use-isomorphic-layout-effect": ["use-isomorphic-layout-effect@1.2.1", "", { "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-tpZZ+EX0gaghDAiFR37hj5MgY6ZN55kLiPkJsKxBMZ6GZdOSPJXiOzPM984oPYZ5AnehYx5WQp1+ME8I/P/pRA=="],
+
+    "use-latest": ["use-latest@1.3.0", "", { "dependencies": { "use-isomorphic-layout-effect": "^1.1.1" }, "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-mhg3xdm9NaM8q+gLT8KryJPnRFOz1/5XPBhmDEVZK1webPzDjrPk7f/mbpeLqTgB9msytYWANxgALOCJKnLvcQ=="],
+
+    "use-sidecar": ["use-sidecar@1.1.3", "", { "dependencies": { "detect-node-es": "^1.1.0", "tslib": "^2.0.0" }, "peerDependencies": { "@types/react": "*", "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0 || ^19.0.0-rc" }, "optionalPeers": ["@types/react"] }, "sha512-Fedw0aZvkhynoPYlA5WXrMCAMm+nSWdZt6lzJQ7Ok8S6Q+VsHmHpRWndVRJ8Be0ZbkfPc5LRYH+5XrzXcEeLRQ=="],
+
     "use-sync-external-store": ["use-sync-external-store@1.6.0", "", { "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-Pp6GSwGP/NrPIrxVFAIkOQeyw8lFenOHijQWkUTrDvrF4ALqylP2C/KCkeS9dpUM3KvYRQhna5vt7IL95+ZQ9w=="],
 
     "util-deprecate": ["util-deprecate@1.0.2", "", {}, "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw=="],
@@ -2262,6 +2381,8 @@
 
     "vue-eslint-parser": ["vue-eslint-parser@10.4.1", "", { "dependencies": { "debug": "^4.4.0", "eslint-scope": "^8.2.0 || ^9.0.0", "eslint-visitor-keys": "^4.2.0 || ^5.0.0", "espree": "^10.3.0 || ^11.0.0", "esquery": "^1.6.0", "semver": "^7.6.3" }, "peerDependencies": { "eslint": "^8.57.0 || ^9.0.0 || ^10.0.0" } }, "sha512-Gk6gRDj0n/fkRa3C3l0bBheoBckUq/Rs0F/TvMWIS6nzzx67amAViMe9CkNgsP2tXyQONvGiHQESHwFtZ3aYDA=="],
 
+    "w3c-keyname": ["w3c-keyname@2.2.8", "", {}, "sha512-dpojBhNsCNN7T82Tm7k26A6G9ML3NkhDsnw9n/eoxSRlVBB4CEtIQ/KTCLI2Fwf3ataSXRhYFkQi3SlnFwPvPQ=="],
+
     "w3c-xmlserializer": ["w3c-xmlserializer@5.0.0", "", { "dependencies": { "xml-name-validator": "^5.0.0" } }, "sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA=="],
 
     "web-namespaces": ["web-namespaces@2.0.1", "", {}, "sha512-bKr1DkiNa2krS7qxNtdrtHAmzuYGFQLiQ13TsorsdT6ULTkPLKuu5+GsFpDlg6JFjUTwX2DyhMPG2be8uPrqsQ=="],
@@ -2336,8 +2457,16 @@
 
     "xmlchars": ["xmlchars@2.2.0", "", {}, "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw=="],
 
+    "y-prosemirror": ["y-prosemirror@1.3.7", "", { "dependencies": { "lib0": "^0.2.109" }, "peerDependencies": { "prosemirror-model": "^1.7.1", "prosemirror-state": "^1.2.3", "prosemirror-view": "^1.9.10", "y-protocols": "^1.0.1", "yjs": "^13.5.38" } }, "sha512-NpM99WSdD4Fx4if5xOMDpPtU3oAmTSjlzh5U4353ABbRHl1HtAFUx6HlebLZfyFxXN9jzKMDkVbcRjqOZVkYQg=="],
+
+    "y-protocols": ["y-protocols@1.0.7", "", { "dependencies": { "lib0": "^0.2.85" }, "peerDependencies": { "yjs": "^13.0.0" } }, "sha512-YSVsLoXxO67J6eE/nV4AtFtT3QEotZf5sK5BHxFBXso7VDUT3Tx07IfA6hsu5Q5OmBdMkQVmFZ9QOA7fikWvnw=="],
+
+    "y-websocket": ["y-websocket@3.0.0", "", { "dependencies": { "lib0": "^0.2.102", "y-protocols": "^1.0.5" }, "peerDependencies": { "yjs": "^13.5.6" } }, "sha512-mUHy7AzkOZ834T/7piqtlA8Yk6AchqKqcrCXjKW8J1w2lPtRDjz8W5/CvXz9higKAHgKRKqpI3T33YkRFLkPtg=="],
+
     "yallist": ["yallist@3.1.1", "", {}, "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g=="],
 
+    "yjs": ["yjs@13.6.31", "", { "dependencies": { "lib0": "^0.2.99" } }, "sha512-Eq+5BRfbeGyqGVrTJL3bEcr8gKkxPuyuoHmAwpk52fDb8kOVMrfVSTRPd6yiGgX5Fskb96qCRjzjbRjrL4YEnw=="],
+
     "yocto-queue": ["yocto-queue@0.1.0", "", {}, "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q=="],
 
     "yocto-spinner": ["yocto-spinner@1.2.0", "", { "dependencies": { "yoctocolors": "^2.1.1" } }, "sha512-Yw0hUB6UA3o4YUgKy3oSe9a4cxoaZ9sBfYDw+JSxo6Id0KoJGoxzPA24qqUXYKBWABs/zDSGTz9kww7t3F0XGw=="],
@@ -2360,6 +2489,8 @@
 
     "@langchain/langgraph-sdk/p-queue": ["p-queue@9.3.0", "", { "dependencies": { "eventemitter3": "^5.0.4", "p-timeout": "^7.0.0" } }, "sha512-7NED7xhQ74Ngp4JP/2e0VZHp7vSWfJfqeiR92jPgxsz6m0Se4P03YoTKa9dDXyZ3r6P616gUXttrB6nnHYKang=="],
 
+    "@mantine/core/type-fest": ["type-fest@4.41.0", "", {}, "sha512-TeTSQ6H5YHvpqVwBRcnLDCBnDOHWYu7IvGbHT6N8AOymcr9PJGjc1GTtiWZTYg0NCgYwvnYWEkVChQAr9bjfwA=="],
+
     "@pierre/diffs/shiki": ["shiki@3.23.0", "", { "dependencies": { "@shikijs/core": "3.23.0", "@shikijs/engine-javascript": "3.23.0", "@shikijs/engine-oniguruma": "3.23.0", "@shikijs/langs": "3.23.0", "@shikijs/themes": "3.23.0", "@shikijs/types": "3.23.0", "@shikijs/vscode-textmate": "^10.0.2", "@types/hast": "^3.0.4" } }, "sha512-55Dj73uq9ZXL5zyeRPzHQsK7Nbyt6Y10k5s7OjuFZGMhpp4r/rsLBH0o/0fstIzX1Lep9VxefWljK/SKCzygIA=="],
 
     "@rollup/pluginutils/estree-walker": ["estree-walker@2.0.2", "", {}, "sha512-Rfkk/Mp/DL7JVje3u18FxFujQlTNR2q6QfMSMB7AvCBx91NGj/ba3kCfza0f6dVDbw7YlRf/nDrn7pQrCCyQ/w=="],
@@ -2380,12 +2511,16 @@
 
     "@tailwindcss/oxide-wasm32-wasi/tslib": ["tslib@2.8.1", "", { "bundled": true }, "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w=="],
 
+    "@tanstack/react-router/@tanstack/react-store": ["@tanstack/react-store@0.9.3", "", { "dependencies": { "@tanstack/store": "0.9.3", "use-sync-external-store": "^1.6.0" }, "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0", "react-dom": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-y2iHd/N9OkoQbFJLUX1T9vbc2O9tjH0pQRgTcx1/Nz4IlwLvkgpuglXUx+mXt0g5ZDFrEeDnONPqkbfxXJKwRg=="],
+
     "@tanstack/router-utils/diff": ["diff@8.0.4", "", {}, "sha512-DPi0FmjiSU5EvQV0++GFDOJ9ASQUVFh5kD+OzOnYdi7n3Wpm9hWWGfB/O2blfHcMVTL5WkQXSnRiK9makhrcnw=="],
 
     "@tanstack/start-plugin-core/@babel/code-frame": ["@babel/code-frame@7.27.1", "", { "dependencies": { "@babel/helper-validator-identifier": "^7.27.1", "js-tokens": "^4.0.0", "picocolors": "^1.1.1" } }, "sha512-cjQ7ZlQ0Mv3b47hABuTevyTuYN4i+loJKGeV9flcCgIK37cCXRh+L1bd3iBHlynerhQ7BhCkn2BPbQUL+rGqFg=="],
 
     "@tanstack/start-plugin-core/source-map": ["source-map@0.7.6", "", {}, "sha512-i5uvt8C3ikiWeNZSVZNWcfZPItFQOsYTUAOkcUPGd8DqDy1uOUikjt5dG+uRlwyvR108Fb9DOd4GvXfT0N2/uQ=="],
 
+    "@tiptap/react/@types/use-sync-external-store": ["@types/use-sync-external-store@0.0.6", "", {}, "sha512-zFDAD+tlpf2r4asuHEj0XH6pY6i0g5NeAHPn+15wk3BV6JA69eERFXC1gyGThDkVa1zCyKr5jox1+2LbV/AMLg=="],
+
     "@typescript-eslint/eslint-plugin/ignore": ["ignore@7.0.5", "", {}, "sha512-Hs59xBNfUIunMFgWAbGX5cq6893IbWg4KnrjbYwX3tx0ztorVgTDA6B2sxf8ejHJ4wz8BqGUMYlnzNBer5NvGg=="],
 
     "@typescript-eslint/typescript-estree/semver": ["semver@7.8.4", "", { "bin": { "semver": "bin/semver.js" } }, "sha512-rUCObTnP32Q08R2uuIrt7r9PlEonuTmtuXYcW6s5kjdlj3xbnwe+21yXptAUYcMAABLkYYTtnmzb3w3EDZfueA=="],
@@ -2508,6 +2643,8 @@
 
     "@tailwindcss/oxide-wasm32-wasi/@emnapi/core/@emnapi/wasi-threads": ["@emnapi/wasi-threads@1.2.1", "", { "dependencies": { "tslib": "^2.4.0" } }, "sha512-uTII7OYF+/Mes/MrcIOYp5yOtSMLBWSIoLPpcgwipoiKbli6k322tcoFsxoIIxPDqW01SQGAgko4EzZi2BNv2w=="],
 
+    "@tanstack/react-router/@tanstack/react-store/@tanstack/store": ["@tanstack/store@0.9.3", "", {}, "sha512-8reSzl/qGWGGVKhBoxXPMWzATSbZLZFWhwBAFO9NAyp0TxzfBP0mIrGb8CP8KrQTmvzXlR/vFPPUrHTLBGyFyw=="],
+
     "cross-spawn/which/isexe": ["isexe@2.0.0", "", {}, "sha512-RHxMLp9lnKHGHRng9QFhRCMbYAcVpn69smSGcq3f36xjgVVWThj4qqLbTLlq7Ssj8B+fIQ1EuCEGI2lKsyQeIw=="],
 
     "cytoscape-fcose/cose-base/layout-base": ["layout-base@2.0.1", "", {}, "sha512-dp3s92+uNI1hWIpPGH3jK2kxE2lMjdXdr+DH8ynZHpd6PUlH6x6cbuXnoMmiNumznqaNO31xu9e79F0uuZ0JFg=="],
diff --git a/ui/package.json b/ui/package.json
index 1af93dc2..0ad00616 100644
--- a/ui/package.json
+++ b/ui/package.json
@@ -13,6 +13,9 @@
   },
   "dependencies": {
     "@base-ui/react": "^1.4.1",
+    "@blocknote/core": "^0.51.4",
+    "@blocknote/mantine": "^0.51.4",
+    "@blocknote/react": "^0.51.4",
     "@fontsource-variable/inter": "^5.2.8",
     "@langchain/core": "^1.1.48",
     "@langchain/langgraph-sdk": "^1.9.21",
@@ -44,7 +47,9 @@
     "tailwind-merge": "^3.6.0",
     "tailwindcss": "^4.2.1",
     "tw-animate-css": "^1.4.0",
-    "vite-tsconfig-paths": "^5.1.4"
+    "vite-tsconfig-paths": "^5.1.4",
+    "y-websocket": "^3.0.0",
+    "yjs": "^13.6.27"
   },
   "devDependencies": {
     "@tanstack/devtools-vite": "^0.6.0",
diff --git a/ui/src/components/agents/AgentThreadView.tsx b/ui/src/components/agents/AgentThreadView.tsx
index 9397e7ef..cf1d7bb8 100644
--- a/ui/src/components/agents/AgentThreadView.tsx
+++ b/ui/src/components/agents/AgentThreadView.tsx
@@ -1,5 +1,7 @@
 import { useMemo, useState } from "react"
+import { Link } from "@tanstack/react-router"
 import { useStreamContext as useAgentThreadStream } from "@langchain/react"
+import { Map as MapIcon } from "lucide-react"
 
 import type { AgentThread, Message } from "@/lib/agents/types"
 import type { ModelSelection } from "@/lib/agents/provider/useModelOptions"
@@ -36,9 +38,15 @@ export function AgentThreadView({ thread }: AgentThreadViewProps) {
   }, [models, thread.model, thread.effort])
   const [selection, setSelection] = useState<ModelSelection | null>(null)
   const activeSelection = selection ?? threadSelection ?? defaultSelection
+  const [planMode, setPlanMode] = useState<boolean | null>(null)
+  const activePlanMode = planMode ?? thread.planMode ?? false
 
   const baseMessages = useMemo<Array<Message>>(() => {
-    const live = streamMessagesToUi(stream.messages, stream.toolCalls, stream.subagents)
+    const live = streamMessagesToUi(
+      stream.messages,
+      stream.toolCalls,
+      stream.subagents
+    )
     if (live.length > 0) return live
     // Optimistic transcript seeded by `AgentsHome` on thread creation (the
     // only case where a fetched thread carries messages — `getThread` returns
@@ -46,12 +54,7 @@ export function AgentThreadView({ thread }: AgentThreadViewProps) {
     // lands in `stream.messages`.
     if (thread.messages.length > 0) return thread.messages
     return live
-  }, [
-    stream.messages,
-    stream.toolCalls,
-    stream.subagents,
-    thread.messages,
-  ])
+  }, [stream.messages, stream.toolCalls, stream.subagents, thread.messages])
 
   const hasMessages = baseMessages.length > 0
   const isStreaming = thread.status === "running" || stream.isLoading
@@ -67,6 +70,26 @@ export function AgentThreadView({ thread }: AgentThreadViewProps) {
         className="flex min-w-0 flex-1 flex-col"
         style={isMobile ? undefined : { minWidth: PANEL_MIN_CHAT_WIDTH }}
       >
+        {thread.planStatus &&
+          thread.planStatus !== "approved" &&
+          thread.planStatus !== "cancelled" && (
+            <Link
+              to="/agents/$threadId/plan"
+              params={{ threadId: thread.id }}
+              data-testid="review-plan-link"
+              className="flex items-center justify-between gap-2 border-b border-[var(--ui-border)] bg-[var(--ui-panel)] px-4 py-2 text-xs text-[var(--ui-text)] hover:bg-[var(--ui-panel-2)]"
+            >
+              <span className="flex items-center gap-2">
+                <MapIcon className="size-3.5 text-[var(--ui-accent)]" />
+                {thread.planStatus === "revising"
+                  ? "The agent is revising the plan."
+                  : "A plan is ready for your review."}
+              </span>
+              <span className="font-medium text-[var(--ui-accent)]">
+                Review plan →
+              </span>
+            </Link>
+          )}
         {hasMessages ? (
           <div className="relative flex min-h-0 flex-1 flex-col overflow-hidden">
             <Messages
@@ -89,11 +112,14 @@ export function AgentThreadView({ thread }: AgentThreadViewProps) {
                       images,
                       model_id: activeSelection?.modelId ?? null,
                       effort: activeSelection?.effort ?? null,
+                      plan_mode: activePlanMode,
                     })
                   }
                   models={models}
                   selection={activeSelection}
                   onSelectionChange={setSelection}
+                  planMode={activePlanMode}
+                  onPlanModeChange={setPlanMode}
                 />
               </div>
             </div>
diff --git a/ui/src/components/agents/AgentsHome.tsx b/ui/src/components/agents/AgentsHome.tsx
index 9339e2e4..b5ac974d 100644
--- a/ui/src/components/agents/AgentsHome.tsx
+++ b/ui/src/components/agents/AgentsHome.tsx
@@ -44,6 +44,7 @@ export function AgentsHome() {
   const { models, defaultSelection } = useModelOptions()
   const [selection, setSelection] = useState<ModelSelection | null>(null)
   const activeSelection = selection ?? defaultSelection
+  const [planMode, setPlanMode] = useState(false)
   const [submitting, setSubmitting] = useState(false)
 
   const reposQuery = useRepos()
@@ -94,6 +95,7 @@ export function AgentsHome() {
     }
     if (repo) configurable.repo = repo
     if (repoOverride === null) configurable.repo_explicitly_none = true
+    if (planMode) configurable.plan_mode = true
 
     stream
       .submit(
@@ -125,6 +127,8 @@ export function AgentsHome() {
             repos={reposQuery.data?.repositories}
             selectedRepo={repo}
             onRepoChange={setRepoOverride}
+            planMode={planMode}
+            onPlanModeChange={setPlanMode}
           />
         </div>
       </div>
diff --git a/ui/src/components/agents/PlanReview.tsx b/ui/src/components/agents/PlanReview.tsx
new file mode 100644
index 00000000..9f1bae12
--- /dev/null
+++ b/ui/src/components/agents/PlanReview.tsx
@@ -0,0 +1,256 @@
+import "@blocknote/core/fonts/inter.css"
+import "@blocknote/mantine/style.css"
+
+import { useCallback, useEffect, useMemo, useRef, useState } from "react"
+import * as Y from "yjs"
+import { WebsocketProvider } from "y-websocket"
+import {
+  CommentsExtension,
+  DefaultThreadStoreAuth,
+  YjsThreadStore,
+} from "@blocknote/core/comments"
+import { useCreateBlockNote } from "@blocknote/react"
+import { BlockNoteView } from "@blocknote/mantine"
+
+import type { HarvestedComment, PlanData } from "@/lib/plan"
+import { approvePlan, planCollabUrl, rejectPlan } from "@/lib/plan"
+import { Button } from "@/components/ui/button"
+import { useResolvedTheme } from "@/lib/theme"
+
+const CURSOR_COLORS = [
+  "#e11d48",
+  "#2563eb",
+  "#059669",
+  "#d97706",
+  "#7c3aed",
+  "#0891b2",
+]
+
+function colorFor(id: string): string {
+  let hash = 0
+  for (let i = 0; i < id.length; i++)
+    hash = (hash * 31 + id.charCodeAt(i)) >>> 0
+  return CURSOR_COLORS[hash % CURSOR_COLORS.length] ?? "#2563eb"
+}
+
+function bodyToText(body: unknown): string {
+  if (typeof body === "string") return body
+  if (!Array.isArray(body)) return ""
+  const parts: Array<string> = []
+  for (const block of body) {
+    const content = (block as { content?: unknown }).content
+    if (typeof content === "string") parts.push(content)
+    else if (Array.isArray(content))
+      parts.push(
+        content.map((node) => (node as { text?: string }).text ?? "").join("")
+      )
+  }
+  return parts.join("\n").trim()
+}
+
+export function PlanReview({ plan }: { plan: PlanData }) {
+  const resolvedTheme = useResolvedTheme()
+
+  const { doc, provider, threadStore } = useMemo(() => {
+    const ydoc = new Y.Doc()
+    const wsProvider = new WebsocketProvider(
+      planCollabUrl(),
+      plan.threadId,
+      ydoc,
+      { connect: true }
+    )
+    wsProvider.awareness.setLocalStateField("user", {
+      name: plan.user.name,
+      color: colorFor(plan.user.id),
+    })
+    // Everyone with read access edits the plan and comments alike — there's no
+    // owner/commenter split for the document (only approval is owner-gated). The
+    // collab WS already relays to any readable user, so this matches the server.
+    const auth = new DefaultThreadStoreAuth(plan.user.id, "editor")
+    const store = new YjsThreadStore(plan.user.id, ydoc.getMap("threads"), auth)
+    return { doc: ydoc, provider: wsProvider, threadStore: store }
+  }, [plan.threadId, plan.user.id, plan.user.name])
+
+  // Defer teardown so React StrictMode's dev-only unmount→remount of the same
+  // memoized provider doesn't destroy instances the remount reuses: the remount
+  // cancels the pending destroy before it runs. A real unmount still tears down.
+  const pendingDestroy = useRef<ReturnType<typeof setTimeout> | null>(null)
+  useEffect(() => {
+    if (pendingDestroy.current) {
+      clearTimeout(pendingDestroy.current)
+      pendingDestroy.current = null
+    }
+    return () => {
+      pendingDestroy.current = setTimeout(() => {
+        provider.destroy()
+        doc.destroy()
+      }, 0)
+    }
+  }, [provider, doc])
+
+  // Track reviewers' display names from awareness so harvested comments are
+  // attributed to people, not raw ids.
+  const usersRef = useRef<Record<string, string>>({
+    [plan.user.id]: plan.user.name,
+  })
+  useEffect(() => {
+    const sync = () => {
+      for (const state of provider.awareness.getStates().values()) {
+        const user = (state as { user?: { name?: string } }).user
+        if (user?.name) usersRef.current[user.name] = user.name
+      }
+    }
+    provider.awareness.on("change", sync)
+    sync()
+    return () => provider.awareness.off("change", sync)
+  }, [provider])
+
+  const resolveUsers = useCallback(
+    (userIds: Array<string>) =>
+      Promise.resolve(
+        userIds.map((id) => ({
+          id,
+          username: usersRef.current[id] ?? id,
+          avatarUrl: "",
+        }))
+      ),
+    []
+  )
+
+  const editor = useCreateBlockNote(
+    {
+      collaboration: {
+        provider,
+        fragment: doc.getXmlFragment("blocknote"),
+        user: { name: plan.user.name, color: colorFor(plan.user.id) },
+        showCursorLabels: "activity",
+      },
+      extensions: [CommentsExtension({ threadStore, resolveUsers })],
+    },
+    [provider, threadStore, resolveUsers]
+  )
+
+  // Seed the shared document from the agent's plan markdown the first time
+  // anyone opens an empty plan. The `seeded` flag + sync barrier prevent a
+  // second reviewer from double-seeding.
+  useEffect(() => {
+    let cancelled = false
+    const seed = async (isSynced: boolean) => {
+      if (!isSynced || cancelled) return
+      const meta = doc.getMap<boolean>("meta")
+      if (meta.get("seeded")) return
+      const blocks = editor.document
+      const empty =
+        blocks.length === 0 ||
+        (blocks.length === 1 && bodyToText(blocks) === "")
+      if (!empty || !plan.markdown.trim()) return
+      const parsed = await editor.tryParseMarkdownToBlocks(plan.markdown)
+      // Re-check after the await: another reviewer may have seeded concurrently.
+      // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+      if (cancelled || !parsed.length || meta.get("seeded")) return
+      editor.replaceBlocks(editor.document, parsed)
+      meta.set("seeded", true)
+    }
+    provider.on("sync", seed)
+    if (provider.synced) void seed(true)
+    return () => {
+      cancelled = true
+      provider.off("sync", seed)
+    }
+  }, [editor, provider, doc, plan.markdown])
+
+  const harvest = useCallback((): Array<HarvestedComment> => {
+    const out: Array<HarvestedComment> = []
+    for (const thread of threadStore.getThreads().values()) {
+      for (const comment of thread.comments) {
+        if (!comment.body) continue
+        out.push({
+          author: usersRef.current[comment.userId] ?? comment.userId,
+          body: bodyToText(comment.body),
+          resolved: thread.resolved,
+        })
+      }
+    }
+    return out
+  }, [threadStore])
+
+  const [decision, setDecision] = useState<string | null>(null)
+  const [busy, setBusy] = useState<"approve" | "reject" | null>(null)
+  const decide = useCallback(
+    async (kind: "approve" | "reject") => {
+      setBusy(kind)
+      try {
+        const comments = harvest()
+        if (kind === "approve") await approvePlan(plan.threadId, comments)
+        else await rejectPlan(plan.threadId, comments)
+        setDecision(
+          kind === "approve"
+            ? "Plan approved — the agent is implementing it."
+            : "Changes requested — the agent is revising the plan."
+        )
+      } finally {
+        setBusy(null)
+      }
+    },
+    [harvest, plan.threadId]
+  )
+
+  return (
+    <div
+      data-testid="plan-review"
+      className="flex min-h-0 flex-1 flex-col bg-[var(--ui-bg)] text-[var(--ui-text)]"
+    >
+      <div className="flex items-center justify-between gap-4 border-b border-[var(--ui-border)] px-6 py-3">
+        <div>
+          <h1 className="text-base font-semibold text-[var(--ui-text)]">
+            Implementation plan
+          </h1>
+          <p className="text-xs text-[var(--ui-text-dim)]">
+            Reviewing as {plan.user.name}
+            {plan.isOwner ? " (owner)" : ""} · status:{" "}
+            <span data-testid="plan-status">{plan.status}</span>
+            {" · edit the plan, or select text to comment"}
+          </p>
+        </div>
+        <div className="flex shrink-0 items-center gap-2">
+          {decision && (
+            <span
+              data-testid="plan-decision"
+              className="text-xs text-[var(--ui-text-dim)]"
+            >
+              {decision}
+            </span>
+          )}
+          {plan.isOwner && (
+            <Button
+              data-testid="approve-plan"
+              disabled={busy !== null || decision !== null}
+              onClick={() => void decide("approve")}
+            >
+              Approve
+            </Button>
+          )}
+          <Button
+            data-testid="reject-plan"
+            variant="secondary"
+            disabled={busy !== null || decision !== null}
+            onClick={() => void decide("reject")}
+          >
+            Request changes
+          </Button>
+        </div>
+      </div>
+      <div
+        className="min-h-0 flex-1 overflow-auto py-4"
+        data-testid="plan-document"
+        data-color-scheme={resolvedTheme}
+      >
+        <BlockNoteView
+          editor={editor}
+          editable={!decision}
+          theme={resolvedTheme}
+        />
+      </div>
+    </div>
+  )
+}
diff --git a/ui/src/components/agents/ported/CloudPromptBar.tsx b/ui/src/components/agents/ported/CloudPromptBar.tsx
index b8cd5b19..cd6ebadd 100644
--- a/ui/src/components/agents/ported/CloudPromptBar.tsx
+++ b/ui/src/components/agents/ported/CloudPromptBar.tsx
@@ -1,4 +1,11 @@
-import { ArrowUp, ChevronDown, ImagePlus, LoaderCircle, X } from "lucide-react"
+import {
+  ArrowUp,
+  ChevronDown,
+  ImagePlus,
+  LoaderCircle,
+  Map as MapIcon,
+  X,
+} from "lucide-react"
 import { StopIcon } from "@phosphor-icons/react"
 import { useQueryClient } from "@tanstack/react-query"
 import { useStreamContext as useAgentThreadStream } from "@langchain/react"
@@ -119,6 +126,9 @@ export interface CloudPromptBarProps {
   repos?: Array<{ full_name: string }>
   selectedRepo?: string | null
   onRepoChange?: (repo: string | null) => void
+  /** When provided, a Plan mode toggle is shown. Plan mode researches read-only and proposes a plan before editing. */
+  planMode?: boolean
+  onPlanModeChange?: (next: boolean) => void
 }
 
 function fileToImageChunk(file: File): Promise<ImageChunk | null> {
@@ -160,6 +170,8 @@ export const CloudPromptBar = memo(function CloudPromptBarComponent({
   repos,
   selectedRepo = null,
   onRepoChange,
+  planMode = false,
+  onPlanModeChange,
 }: CloudPromptBarProps) {
   const [value, setValue] = useState("")
   const [pendingImages, setPendingImages] = useState<Array<ImageChunk>>([])
@@ -320,6 +332,10 @@ export const CloudPromptBar = memo(function CloudPromptBarComponent({
       e.preventDefault()
       void handleSubmit()
     }
+    if (e.key === "Tab" && e.shiftKey && onPlanModeChange) {
+      e.preventDefault()
+      onPlanModeChange(!planMode)
+    }
   }
 
   const pickerDisabled = combos.length === 0 || !onSelectionChange
@@ -469,6 +485,24 @@ export const CloudPromptBar = memo(function CloudPromptBarComponent({
             )}
           </div>
 
+          {onPlanModeChange && (
+            <button
+              type="button"
+              onClick={() => onPlanModeChange(!planMode)}
+              aria-pressed={planMode}
+              title="Plan mode: research read-only and propose a plan before editing (Shift+Tab)"
+              className={cn(
+                "flex shrink-0 items-center gap-1 rounded-full border px-2 py-1 text-[12px] transition-colors",
+                planMode
+                  ? "border-[var(--ui-accent)] bg-[var(--ui-accent)]/10 text-[color:var(--ui-accent)]"
+                  : "border-[var(--ui-border)] text-[color:var(--ui-text-muted)] hover:bg-[var(--ui-panel-2)] hover:text-[color:var(--ui-text)]"
+              )}
+            >
+              <MapIcon className="size-3.5" />
+              <span>Plan</span>
+            </button>
+          )}
+
           <button
             type="button"
             onClick={() => fileInputRef.current?.click()}
diff --git a/ui/src/lib/agents/api.ts b/ui/src/lib/agents/api.ts
index e0bafc1d..273957a7 100644
--- a/ui/src/lib/agents/api.ts
+++ b/ui/src/lib/agents/api.ts
@@ -17,6 +17,7 @@ export interface ThreadMessageRequest {
   images?: Array<ImageChunk>
   model_id?: string | null
   effort?: string | null
+  plan_mode?: boolean
 }
 
 export interface ScheduleCreateRequest {
diff --git a/ui/src/lib/agents/provider/useSubmitAgentMessage.ts b/ui/src/lib/agents/provider/useSubmitAgentMessage.ts
index 9a15076c..5a33442a 100644
--- a/ui/src/lib/agents/provider/useSubmitAgentMessage.ts
+++ b/ui/src/lib/agents/provider/useSubmitAgentMessage.ts
@@ -48,6 +48,7 @@ export function useSubmitAgentMessage(threadId: string) {
           images: vars.images,
           model_id: vars.model_id,
           effort: vars.effort,
+          plan_mode: vars.plan_mode,
         });
 
       if (stream.isLoading) {
@@ -64,14 +65,16 @@ export function useSubmitAgentMessage(threadId: string) {
         }
       }
 
-      const config = (!vars.model_id || !vars.effort)
-        ? undefined
-        : {
-          configurable: {
-            agent_model_id: vars.model_id,
-            agent_effort: vars.effort,
-          },
-        };
+      const configurable: Record<string, unknown> = {};
+      if (vars.model_id && vars.effort) {
+        configurable.agent_model_id = vars.model_id;
+        configurable.agent_effort = vars.effort;
+      }
+      if (vars.plan_mode) {
+        configurable.plan_mode = true;
+      }
+      const config =
+        Object.keys(configurable).length > 0 ? { configurable } : undefined;
 
       // Don't await: `stream.submit` resolves only when the run *finishes*, so
       // awaiting would keep the mutation `isPending` (and the prompt bar
diff --git a/ui/src/lib/agents/queries.ts b/ui/src/lib/agents/queries.ts
index 7d320572..cf5ff2b8 100644
--- a/ui/src/lib/agents/queries.ts
+++ b/ui/src/lib/agents/queries.ts
@@ -225,6 +225,7 @@ export interface SendAgentMessageVariables {
   images?: Array<ImageChunk>
   model_id?: string | null
   effort?: string | null
+  plan_mode?: boolean
 }
 
 export function useCancelAgentThread(threadId: string) {
diff --git a/ui/src/lib/agents/types.ts b/ui/src/lib/agents/types.ts
index 657dfe82..e288a182 100644
--- a/ui/src/lib/agents/types.ts
+++ b/ui/src/lib/agents/types.ts
@@ -180,6 +180,8 @@ export interface AgentThread {
   branch: string
   model: string
   effort?: string | null
+  planMode?: boolean
+  planStatus?: string | null
   source?: AgentSource
   status: AgentStatus
   viewed: boolean
diff --git a/ui/src/lib/plan.ts b/ui/src/lib/plan.ts
new file mode 100644
index 00000000..84c8f2cd
--- /dev/null
+++ b/ui/src/lib/plan.ts
@@ -0,0 +1,111 @@
+/**
+ * Client for the plan-review API + the Yjs collaboration endpoint.
+ *
+ * The plan document and its comment threads sync over a y-websocket connection;
+ * approve/reject post the client-harvested comments so the agent receives them
+ * as the instruction for the follow-up run.
+ */
+
+const API_BASE = (import.meta.env.VITE_DASHBOARD_API_BASE_URL ?? "").replace(
+  /\/$/,
+  ""
+)
+
+function apiBase(): string {
+  if (API_BASE) return API_BASE
+  return typeof window !== "undefined" ? window.location.origin : ""
+}
+
+export interface PlanUser {
+  id: string
+  login: string
+  email: string | null
+  name: string
+}
+
+export type PlanStatus =
+  | "planning"
+  | "ready"
+  | "revising"
+  | "approved"
+  | "cancelled"
+
+export interface PlanData {
+  threadId: string
+  status: PlanStatus
+  markdown: string
+  isOwner: boolean
+  user: PlanUser
+}
+
+export interface HarvestedComment {
+  author: string
+  body: string
+  quote?: string
+  resolved: boolean
+}
+
+export class PlanApiError extends Error {
+  constructor(
+    public readonly status: number,
+    message: string
+  ) {
+    super(message)
+    this.name = "PlanApiError"
+  }
+}
+
+async function req<T>(path: string, init: RequestInit = {}): Promise<T> {
+  const res = await fetch(`${apiBase()}/dashboard/api${path}`, {
+    ...init,
+    credentials: "include",
+    headers: { "Content-Type": "application/json", ...(init.headers ?? {}) },
+  })
+  if (!res.ok) {
+    let message = res.statusText
+    try {
+      const body = await res.json()
+      if (body?.detail)
+        message =
+          typeof body.detail === "string"
+            ? body.detail
+            : JSON.stringify(body.detail)
+    } catch {
+      /* ignore */
+    }
+    throw new PlanApiError(res.status, message)
+  }
+  if (res.status === 204) return undefined as T
+  return (await res.json()) as T
+}
+
+export function getPlan(threadId: string): Promise<PlanData> {
+  return req<PlanData>(`/plan/${encodeURIComponent(threadId)}`)
+}
+
+export function approvePlan(
+  threadId: string,
+  comments: Array<HarvestedComment>
+): Promise<{ status: string }> {
+  return req(`/plan/${encodeURIComponent(threadId)}/approve`, {
+    method: "POST",
+    body: JSON.stringify({ comments }),
+  })
+}
+
+export function rejectPlan(
+  threadId: string,
+  comments: Array<HarvestedComment>
+): Promise<{ status: string }> {
+  return req(`/plan/${encodeURIComponent(threadId)}/reject`, {
+    method: "POST",
+    body: JSON.stringify({ comments }),
+  })
+}
+
+/** Base URL the y-websocket provider connects to; it appends `/<threadId>`. */
+export function planCollabUrl(): string {
+  const base = apiBase()
+  const wsBase = base.replace(/^http/, "ws")
+  return `${wsBase}/dashboard/api/plan/yjs`
+}
diff --git a/ui/src/routeTree.gen.ts b/ui/src/routeTree.gen.ts
index 1dbd2ecf..ad789d34 100644
--- a/ui/src/routeTree.gen.ts
+++ b/ui/src/routeTree.gen.ts
@@ -29,6 +29,7 @@ import { Route as AgentsAutomationsIndexRouteImport } from './routes/agents/auto
 import { Route as ReviewRepositoriesOwnerRouteImport } from './routes/review_.repositories.$owner'
 import { Route as AgentsAutomationsNewRouteImport } from './routes/agents/automations/new'
 import { Route as AgentsAutomationsScheduleIdRouteImport } from './routes/agents/automations/$scheduleId'
+import { Route as AgentsThreadIdPlanRouteImport } from './routes/agents/$threadId_.plan'
 import { Route as AgentsReviewsOwnerRepoNumberRouteImport } from './routes/agents/reviews/$owner.$repo.$number'
 
 const UsageRoute = UsageRouteImport.update({
@@ -132,6 +133,11 @@ const AgentsAutomationsScheduleIdRoute =
     path: '/automations/$scheduleId',
     getParentRoute: () => AgentsRoute,
   } as any)
+const AgentsThreadIdPlanRoute = AgentsThreadIdPlanRouteImport.update({
+  id: '/$threadId_/plan',
+  path: '/$threadId/plan',
+  getParentRoute: () => AgentsRoute,
+} as any)
 const AgentsReviewsOwnerRepoNumberRoute =
   AgentsReviewsOwnerRepoNumberRouteImport.update({
     id: '/reviews/$owner/$repo/$number',
@@ -155,6 +161,7 @@ export interface FileRoutesByFullPath {
   '/agents/instructions': typeof AgentsInstructionsRoute
   '/review/styles': typeof ReviewStylesRoute
   '/agents/': typeof AgentsIndexRoute
+  '/agents/$threadId/plan': typeof AgentsThreadIdPlanRoute
   '/agents/automations/$scheduleId': typeof AgentsAutomationsScheduleIdRoute
   '/agents/automations/new': typeof AgentsAutomationsNewRoute
   '/review/repositories/$owner': typeof ReviewRepositoriesOwnerRoute
@@ -177,6 +184,7 @@ export interface FileRoutesByTo {
   '/agents/instructions': typeof AgentsInstructionsRoute
   '/review/styles': typeof ReviewStylesRoute
   '/agents': typeof AgentsIndexRoute
+  '/agents/$threadId/plan': typeof AgentsThreadIdPlanRoute
   '/agents/automations/$scheduleId': typeof AgentsAutomationsScheduleIdRoute
   '/agents/automations/new': typeof AgentsAutomationsNewRoute
   '/review/repositories/$owner': typeof ReviewRepositoriesOwnerRoute
@@ -201,6 +209,7 @@ export interface FileRoutesById {
   '/agents_/instructions': typeof AgentsInstructionsRoute
   '/review_/styles': typeof ReviewStylesRoute
   '/agents/': typeof AgentsIndexRoute
+  '/agents/$threadId_/plan': typeof AgentsThreadIdPlanRoute
   '/agents/automations/$scheduleId': typeof AgentsAutomationsScheduleIdRoute
   '/agents/automations/new': typeof AgentsAutomationsNewRoute
   '/review_/repositories/$owner': typeof ReviewRepositoriesOwnerRoute
@@ -226,6 +235,7 @@ export interface FileRouteTypes {
     | '/agents/instructions'
     | '/review/styles'
     | '/agents/'
+    | '/agents/$threadId/plan'
     | '/agents/automations/$scheduleId'
     | '/agents/automations/new'
     | '/review/repositories/$owner'
@@ -248,6 +258,7 @@ export interface FileRouteTypes {
     | '/agents/instructions'
     | '/review/styles'
     | '/agents'
+    | '/agents/$threadId/plan'
     | '/agents/automations/$scheduleId'
     | '/agents/automations/new'
     | '/review/repositories/$owner'
@@ -271,6 +282,7 @@ export interface FileRouteTypes {
     | '/agents_/instructions'
     | '/review_/styles'
     | '/agents/'
+    | '/agents/$threadId_/plan'
     | '/agents/automations/$scheduleId'
     | '/agents/automations/new'
     | '/review_/repositories/$owner'
@@ -437,6 +449,13 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof AgentsAutomationsScheduleIdRouteImport
       parentRoute: typeof AgentsRoute
     }
+    '/agents/$threadId_/plan': {
+      id: '/agents/$threadId_/plan'
+      path: '/$threadId/plan'
+      fullPath: '/agents/$threadId/plan'
+      preLoaderRoute: typeof AgentsThreadIdPlanRouteImport
+      parentRoute: typeof AgentsRoute
+    }
     '/agents/reviews/$owner/$repo/$number': {
       id: '/agents/reviews/$owner/$repo/$number'
       path: '/reviews/$owner/$repo/$number'
@@ -451,6 +470,7 @@ interface AgentsRouteChildren {
   AgentsThreadIdRoute: typeof AgentsThreadIdRoute
   AgentsThreadsRoute: typeof AgentsThreadsRoute
   AgentsIndexRoute: typeof AgentsIndexRoute
+  AgentsThreadIdPlanRoute: typeof AgentsThreadIdPlanRoute
   AgentsAutomationsScheduleIdRoute: typeof AgentsAutomationsScheduleIdRoute
   AgentsAutomationsNewRoute: typeof AgentsAutomationsNewRoute
   AgentsAutomationsIndexRoute: typeof AgentsAutomationsIndexRoute
@@ -462,6 +482,7 @@ const AgentsRouteChildren: AgentsRouteChildren = {
   AgentsThreadIdRoute: AgentsThreadIdRoute,
   AgentsThreadsRoute: AgentsThreadsRoute,
   AgentsIndexRoute: AgentsIndexRoute,
+  AgentsThreadIdPlanRoute: AgentsThreadIdPlanRoute,
   AgentsAutomationsScheduleIdRoute: AgentsAutomationsScheduleIdRoute,
   AgentsAutomationsNewRoute: AgentsAutomationsNewRoute,
   AgentsAutomationsIndexRoute: AgentsAutomationsIndexRoute,
diff --git a/ui/src/routes/agents/$threadId_.plan.tsx b/ui/src/routes/agents/$threadId_.plan.tsx
new file mode 100644
index 00000000..3a4a8965
--- /dev/null
+++ b/ui/src/routes/agents/$threadId_.plan.tsx
@@ -0,0 +1,109 @@
+import { Link, createFileRoute } from "@tanstack/react-router"
+import { useQuery } from "@tanstack/react-query"
+import { useEffect, useState } from "react"
+import { ArrowLeft } from "lucide-react"
+
+import { PlanReview } from "@/components/agents/PlanReview"
+import { Skeleton } from "@/components/ui/skeleton"
+import { PlanApiError, getPlan } from "@/lib/plan"
+
+export const Route = createFileRoute("/agents/$threadId_/plan")({
+  component: PlanPage,
+})
+
+function Centered({ children }: { children: React.ReactNode }) {
+  return (
+    <div className="flex min-w-0 flex-1 items-center justify-center p-6">
+      {children}
+    </div>
+  )
+}
+
+function BackLink({ threadId }: { threadId: string }) {
+  return (
+    <Link
+      to="/agents/$threadId"
+      params={{ threadId }}
+      className="inline-flex items-center gap-1 text-xs text-[var(--ui-text-dim)] hover:text-[var(--ui-text)]"
+    >
+      <ArrowLeft className="size-3.5" />
+      Back to conversation
+    </Link>
+  )
+}
+
+function PlanPage() {
+  const { threadId } = Route.useParams()
+
+  // BlockNote + Yjs are browser-only; mount client-side before rendering.
+  const [mounted, setMounted] = useState(false)
+  useEffect(() => setMounted(true), [])
+
+  const query = useQuery({
+    queryKey: ["plan", threadId],
+    queryFn: () => getPlan(threadId),
+    // The agent shares the link as soon as it enters plan mode, before the plan
+    // is written — poll until the plan content is published.
+    refetchInterval: (q) => (q.state.data?.markdown ? false : 2000),
+    retry: (count, error) =>
+      !(
+        error instanceof PlanApiError &&
+        (error.status === 401 || error.status === 404)
+      ) && count < 3,
+  })
+
+  if (!mounted || query.isLoading) {
+    return (
+      <Centered>
+        <Skeleton className="h-48 w-full max-w-2xl" />
+      </Centered>
+    )
+  }
+
+  if (query.isError) {
+    const status = query.error instanceof PlanApiError ? query.error.status : 0
+    return (
+      <Centered>
+        <div className="space-y-3 text-center text-sm text-[var(--ui-text-dim)]">
+          <p>
+            {status === 401
+              ? "Please sign in to view this plan."
+              : "This plan could not be found."}
+          </p>
+          <BackLink threadId={threadId} />
+        </div>
+      </Centered>
+    )
+  }
+
+  const plan = query.data
+  if (!plan) {
+    return (
+      <Centered>
+        <Skeleton className="h-48 w-full max-w-2xl" />
+      </Centered>
+    )
+  }
+  if (!plan.markdown.trim()) {
+    return (
+      <Centered>
+        <div className="space-y-3 text-center text-sm text-[var(--ui-text-dim)]">
+          <p>
+            The agent is still writing the plan. This page will update
+            automatically…
+          </p>
+          <BackLink threadId={threadId} />
+        </div>
+      </Centered>
+    )
+  }
+
+  return (
+    <div className="flex min-w-0 flex-1 flex-col">
+      <div className="border-b border-[var(--ui-border)] px-6 pt-3">
+        <BackLink threadId={threadId} />
+      </div>
+      <PlanReview plan={plan} />
+    </div>
+  )
+}
diff --git a/ui/vite.config.ts b/ui/vite.config.ts
index f50d5cb4..3d30de8d 100644
--- a/ui/vite.config.ts
+++ b/ui/vite.config.ts
@@ -1,4 +1,5 @@
-import { defineConfig } from "vite"
+import http from "node:http"
+import { defineConfig, type Plugin } from "vite"
 import { devtools } from "@tanstack/devtools-vite"
 import { tanstackStart } from "@tanstack/react-start/plugin/vite"
 import viteReact from "@vitejs/plugin-react"
@@ -7,10 +8,77 @@ import tailwindcss from "@tailwindcss/vite"
 import { nitro } from "nitro/vite"
 import { VitePWA } from "vite-plugin-pwa"
 
+// Dev-only: when E2E_HARNESS is set (the `dev:mock` local harness) serve the app
+// and the harness from one origin by proxying the API routes + the Yjs collab
+// WebSocket to the harness. Same-origin keeps the session cookie on the WS, which
+// the plan-review collab requires. Inert in production (E2E_HARNESS unset).
+function mockHarnessProxy(): Plugin | null {
+  const target = process.env.E2E_HARNESS
+  if (!target) return null
+  const prefixes = [
+    "/dashboard/api",
+    "/webhooks",
+    "/mock",
+    "/control",
+    "/fake-gh",
+    "/fake-slack",
+    "/static",
+    "/ok",
+  ]
+  const matches = (url?: string): boolean =>
+    !!url &&
+    prefixes.some(
+      (p) => url === p || url.startsWith(`${p}/`) || url.startsWith(`${p}?`)
+    )
+  const upstream = new URL(target)
+  return {
+    name: "mock-harness-proxy",
+    enforce: "pre",
+    async configureServer(server) {
+      const { createProxyServer } = await import("httpxy")
+      const proxy = createProxyServer({ target })
+      proxy.on("error", () => {})
+      server.middlewares.use((req, res, next) => {
+        if (matches(req.url)) void proxy.web(req, res).catch(() => {})
+        else next()
+      })
+      // Proxy the Yjs WebSocket by hand (httpxy's ws upgrade is unreliable here).
+      // Only claim our paths; Vite's own HMR socket upgrade is left untouched.
+      server.httpServer?.on("upgrade", (req, socket, head) => {
+        if (!matches(req.url)) return
+        const proxyReq = http.request({
+          host: upstream.hostname,
+          port: upstream.port,
+          method: "GET",
+          path: req.url,
+          headers: req.headers,
+        })
+        proxyReq.on("upgrade", (proxyRes, proxySocket, proxyHead) => {
+          const lines = Object.entries(proxyRes.headers)
+            .map(([k, v]) => `${k}: ${Array.isArray(v) ? v.join(", ") : v}`)
+            .join("\r\n")
+          socket.write(
+            `HTTP/1.1 ${proxyRes.statusCode} ${proxyRes.statusMessage}\r\n${lines}\r\n\r\n`
+          )
+          if (proxyHead?.length) socket.write(proxyHead)
+          if (head?.length) proxySocket.write(head)
+          proxySocket.on("error", () => socket.destroy())
+          socket.on("error", () => proxySocket.destroy())
+          proxySocket.pipe(socket)
+          socket.pipe(proxySocket)
+        })
+        proxyReq.on("error", () => socket.destroy())
+        proxyReq.end()
+      })
+    },
+  }
+}
+
 const config = defineConfig({
   optimizeDeps: { include: ["workbox-window"] },
   worker: { format: "es" },
   plugins: [
+    mockHarnessProxy(),
     devtools(),
     nitro(),
     viteTsConfigPaths({
diff --git a/uv.lock b/uv.lock
index 23141150..c474ae8b 100644
--- a/uv.lock
+++ b/uv.lock
@@ -2010,6 +2010,8 @@ dependencies = [
     { name = "langgraph-sdk" },
     { name = "langsmith" },
     { name = "markdownify" },
+    { name = "pycrdt" },
+    { name = "pycrdt-websocket" },
     { name = "pyjwt" },
     { name = "uvicorn" },
 ]
@@ -2044,6 +2046,8 @@ requires-dist = [
     { name = "langgraph-sdk", specifier = ">=0.4.2" },
     { name = "langsmith", specifier = "==0.8.18" },
     { name = "markdownify", specifier = ">=1.2.2" },
+    { name = "pycrdt", specifier = ">=0.14.1,<0.15" },
+    { name = "pycrdt-websocket", specifier = ">=0.16.3,<0.17" },
     { name = "pygments", marker = "extra == 'dev'", specifier = ">=2.20.0" },
     { name = "pyjwt", specifier = ">=2.12.1" },
     { name = "pytest", marker = "extra == 'dev'", specifier = ">=9.0.3" },
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 ]
 
+[[package]]
+name = "pycrdt"
+version = "0.14.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
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+]
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