diff --git a/agent/dashboard/routes.py b/agent/dashboard/routes.py
index 5fff2e01..b6dabc9a 100644
--- a/agent/dashboard/routes.py
+++ b/agent/dashboard/routes.py
@@ -579,7 +579,7 @@ async def api_delete_review_style(
 async def api_list_threads(
     session: dict[str, Any] = _SESSION_DEP,
 ) -> list[dict[str, Any]]:
-    return await list_dashboard_threads(session["sub"])
+    return await list_dashboard_threads(session["sub"], email=session.get("email"))
 
 
 @router.post("/threads")
@@ -595,7 +595,7 @@ async def api_get_thread(
     thread_id: str,
     session: dict[str, Any] = _SESSION_DEP,
 ) -> dict[str, Any]:
-    return await get_dashboard_thread(thread_id, session["sub"])
+    return await get_dashboard_thread(thread_id, session["sub"], email=session.get("email"))
 
 
 @router.post("/threads/{thread_id}/messages")
@@ -604,7 +604,7 @@ async def api_send_thread_message(
     body: ThreadMessageBody,
     session: dict[str, Any] = _SESSION_DEP,
 ) -> dict[str, Any]:
-    return await send_dashboard_message(thread_id, session["sub"], body)
+    return await send_dashboard_message(thread_id, session["sub"], body, email=session.get("email"))
 
 
 @router.post("/threads/{thread_id}/cancel")
@@ -612,7 +612,7 @@ async def api_cancel_thread(
     thread_id: str,
     session: dict[str, Any] = _SESSION_DEP,
 ) -> dict[str, Any]:
-    return await cancel_dashboard_thread(thread_id, session["sub"])
+    return await cancel_dashboard_thread(thread_id, session["sub"], email=session.get("email"))
 
 
 @router.delete("/threads/{thread_id}")
@@ -620,7 +620,7 @@ async def api_delete_thread(
     thread_id: str,
     session: dict[str, Any] = _SESSION_DEP,
 ) -> Response:
-    await delete_dashboard_thread(thread_id, session["sub"])
+    await delete_dashboard_thread(thread_id, session["sub"], email=session.get("email"))
     return Response(status_code=204)
 
 
@@ -634,7 +634,7 @@ async def api_stream_thread(
 
     async def event_generator():
         async for chunk in stream_dashboard_thread(
-            thread_id, session["sub"], last_event_id=last_event_id
+            thread_id, session["sub"], email=session.get("email"), last_event_id=last_event_id
         ):
             yield chunk
 
diff --git a/agent/dashboard/thread_api.py b/agent/dashboard/thread_api.py
index f272469e..1182bc76 100644
--- a/agent/dashboard/thread_api.py
+++ b/agent/dashboard/thread_api.py
@@ -27,6 +27,8 @@ logger = logging.getLogger(__name__)
 _ASSISTANT_ID = "agent"
 _DASHBOARD_SOURCE = "dashboard"
 _DASHBOARD_STREAM_MODES: tuple[str, ...] = ("values", "updates", "messages-tuple")
+# Sources whose threads should surface in the Agents UI (besides "dashboard").
+_SURFACED_SOURCES: tuple[str, ...] = ("dashboard", "github", "slack", "linear")
 
 
 def _agent_version_metadata() -> dict[str, str]:
@@ -91,11 +93,28 @@ def _thread_owner_login(metadata: dict[str, Any]) -> str | None:
     return login.strip() if isinstance(login, str) and login.strip() else None
 
 
-def _assert_thread_owner(metadata: dict[str, Any], login: str) -> None:
-    owner = _thread_owner_login(metadata)
-    if owner != login:
-        raise HTTPException(404, "thread not found")
-    if metadata.get("source") != _DASHBOARD_SOURCE:
+def _thread_owner_email(metadata: dict[str, Any]) -> str | None:
+    email = metadata.get("triggering_user_email")
+    return email.strip().lower() if isinstance(email, str) and email.strip() else None
+
+
+def _thread_source(metadata: dict[str, Any]) -> str:
+    source = metadata.get("source")
+    return source if isinstance(source, str) and source else _DASHBOARD_SOURCE
+
+
+def _user_owns_thread(metadata: dict[str, Any], login: str, email: str | None) -> bool:
+    if _thread_source(metadata) not in _SURFACED_SOURCES:
+        return False
+    if _thread_owner_login(metadata) == login:
+        return True
+    if email and _thread_owner_email(metadata) == email.strip().lower():
+        return True
+    return False
+
+
+def _assert_thread_owner(metadata: dict[str, Any], login: str, email: str | None = None) -> None:
+    if not _user_owns_thread(metadata, login, email):
         raise HTTPException(404, "thread not found")
 
 
@@ -153,6 +172,7 @@ def _thread_summary(
         "branch": metadata.get("branch_name") or metadata.get("base_branch") or "main",
         "model": model,
         "effort": effort,
+        "source": _thread_source(metadata),
         "status": status,
         "createdAt": int(created_at) if isinstance(created_at, (int, float)) else _now_ms(),
         "updatedAt": int(updated_at) if isinstance(updated_at, (int, float)) else _now_ms(),
@@ -182,21 +202,40 @@ async def _latest_run_status(thread_id: str) -> str | None:
     return raw.lower() if isinstance(raw, str) else None
 
 
-async def list_dashboard_threads(login: str, *, limit: int = 50) -> list[dict[str, Any]]:
-    threads = await langgraph_client().threads.search(
-        metadata={"source": _DASHBOARD_SOURCE, "github_login": login},
-        limit=limit,
-        sort_by="updated_at",
-        sort_order="desc",
-    )
-    out: list[dict[str, Any]] = []
-    for thread in threads or []:
-        if isinstance(thread, dict):
-            out.append(_thread_summary(thread))
-    return out
+async def list_dashboard_threads(
+    login: str, *, email: str | None = None, limit: int = 50
+) -> list[dict[str, Any]]:
+    client = langgraph_client()
+    searches: list[dict[str, Any]] = [{"github_login": login}]
+    if email and email.strip():
+        searches.append({"triggering_user_email": email.strip().lower()})
+
+    seen: dict[str, dict[str, Any]] = {}
+    for metadata_filter in searches:
+        threads = await client.threads.search(
+            metadata=metadata_filter,
+            limit=limit,
+            sort_by="updated_at",
+            sort_order="desc",
+        )
+        for thread in threads or []:
+            if not isinstance(thread, dict):
+                continue
+            meta = thread.get("metadata") if isinstance(thread.get("metadata"), dict) else {}
+            if not _user_owns_thread(meta, login, email):
+                continue
+            thread_id = thread.get("thread_id") or thread.get("id")
+            if isinstance(thread_id, str) and thread_id not in seen:
+                seen[thread_id] = thread
+
+    summaries = [_thread_summary(thread) for thread in seen.values()]
+    summaries.sort(key=lambda item: item.get("updatedAt", 0), reverse=True)
+    return summaries[:limit]
 
 
-async def get_dashboard_thread(thread_id: str, login: str) -> dict[str, Any]:
+async def get_dashboard_thread(
+    thread_id: str, login: str, *, email: str | None = None
+) -> dict[str, Any]:
     client = langgraph_client()
     try:
         thread = await client.threads.get(thread_id)
@@ -205,7 +244,7 @@ async def get_dashboard_thread(thread_id: str, login: str) -> dict[str, Any]:
         raise HTTPException(404, "thread not found") from exc
 
     metadata = thread.get("metadata") if isinstance(thread.get("metadata"), dict) else {}
-    _assert_thread_owner(metadata, login)
+    _assert_thread_owner(metadata, login, email)
 
     messages: list[dict[str, Any]] = []
     try:
@@ -321,7 +360,7 @@ async def create_dashboard_thread(login: str, body: ThreadCreateBody) -> dict[st
 
 
 async def send_dashboard_message(
-    thread_id: str, login: str, body: ThreadMessageBody
+    thread_id: str, login: str, body: ThreadMessageBody, *, email: str | None = None
 ) -> dict[str, Any]:
     client = langgraph_client()
     try:
@@ -330,7 +369,7 @@ async def send_dashboard_message(
         raise HTTPException(404, "thread not found") from exc
 
     metadata = thread.get("metadata") if isinstance(thread.get("metadata"), dict) else {}
-    _assert_thread_owner(metadata, login)
+    _assert_thread_owner(metadata, login, email)
     owner, name, _ = _metadata_repo(metadata)
     if not owner or not name:
         raise HTTPException(400, "thread is missing repository metadata")
@@ -355,13 +394,18 @@ async def send_dashboard_message(
 
     await _persist_dashboard_github_token(thread_id, login)
     profile = await get_profile(login) or {}
+    thread_source = _thread_source(metadata)
     configurable: dict[str, Any] = {
         "thread_id": thread_id,
-        "source": _DASHBOARD_SOURCE,
+        "source": thread_source,
         "github_login": login,
         "repo": {"owner": owner, "name": name},
         "user_email": profile.get("email"),
     }
+    source_context = metadata.get("source_context")
+    if isinstance(source_context, dict):
+        for key, value in source_context.items():
+            configurable.setdefault(key, value)
     if chosen_model and chosen_effort:
         configurable["agent_model_id"] = chosen_model
         configurable["agent_effort"] = chosen_effort
@@ -384,7 +428,9 @@ async def send_dashboard_message(
     )
 
 
-async def cancel_dashboard_thread(thread_id: str, login: str) -> dict[str, Any]:
+async def cancel_dashboard_thread(
+    thread_id: str, login: str, *, email: str | None = None
+) -> dict[str, Any]:
     client = langgraph_client()
     try:
         thread = await client.threads.get(thread_id)
@@ -392,7 +438,7 @@ async def cancel_dashboard_thread(thread_id: str, login: str) -> dict[str, Any]:
         raise HTTPException(404, "thread not found") from exc
 
     metadata = thread.get("metadata") if isinstance(thread.get("metadata"), dict) else {}
-    _assert_thread_owner(metadata, login)
+    _assert_thread_owner(metadata, login, email)
 
     run_id = metadata.get("latest_run_id")
     if isinstance(run_id, str) and run_id:
@@ -411,7 +457,7 @@ async def cancel_dashboard_thread(thread_id: str, login: str) -> dict[str, Any]:
     )
 
 
-async def delete_dashboard_thread(thread_id: str, login: str) -> None:
+async def delete_dashboard_thread(thread_id: str, login: str, *, email: str | None = None) -> None:
     client = langgraph_client()
     try:
         thread = await client.threads.get(thread_id)
@@ -419,7 +465,7 @@ async def delete_dashboard_thread(thread_id: str, login: str) -> None:
         raise HTTPException(404, "thread not found") from exc
 
     metadata = thread.get("metadata") if isinstance(thread.get("metadata"), dict) else {}
-    _assert_thread_owner(metadata, login)
+    _assert_thread_owner(metadata, login, email)
 
     run_id = metadata.get("latest_run_id")
     if isinstance(run_id, str) and run_id:
@@ -432,7 +478,7 @@ async def delete_dashboard_thread(thread_id: str, login: str) -> None:
 
 
 async def stream_dashboard_thread(
-    thread_id: str, login: str, *, last_event_id: str | None = None
+    thread_id: str, login: str, *, email: str | None = None, last_event_id: str | None = None
 ) -> AsyncIterator[str]:
     try:
         thread = await langgraph_client().threads.get(thread_id)
@@ -440,7 +486,7 @@ async def stream_dashboard_thread(
         raise HTTPException(404, "thread not found") from exc
 
     metadata = thread.get("metadata") if isinstance(thread.get("metadata"), dict) else {}
-    _assert_thread_owner(metadata, login)
+    _assert_thread_owner(metadata, login, email)
 
     stream = await langgraph_client().threads.join_stream(
         thread_id,
diff --git a/agent/webapp.py b/agent/webapp.py
index 47469d1d..c2dba64b 100644
--- a/agent/webapp.py
+++ b/agent/webapp.py
@@ -8,6 +8,7 @@ import os
 import uuid
 from collections.abc import AsyncIterator
 from contextlib import asynccontextmanager
+from datetime import UTC, datetime
 from typing import Any
 from urllib.parse import quote
 
@@ -481,6 +482,68 @@ async def _upsert_slack_thread_repo_metadata(
         )
 
 
+async def upsert_agent_thread_owner_metadata(
+    thread_id: str,
+    *,
+    source: str,
+    repo_config: dict[str, str] | None = None,
+    github_login: str = "",
+    user_email: str = "",
+    title: str = "",
+    source_context: dict[str, Any] | None = None,
+) -> None:
+    """Persist owner/source metadata so the dashboard can surface non-dashboard threads.
+
+    Webhook-triggered runs only pass ``source``/``github_login`` through the run
+    config; the Agents UI lists and authorizes threads by thread *metadata*, so we
+    mirror the owner-identifying fields onto the thread here.
+    """
+    now_ms = int(datetime.now(UTC).timestamp() * 1000)
+    resolved_login = github_login or resolve_login_from_email(user_email) or ""
+    metadata: dict[str, Any] = {"source": source, "updated_at_ms": now_ms}
+    if isinstance(repo_config, dict) and repo_config.get("owner") and repo_config.get("name"):
+        metadata["repo"] = repo_config
+        metadata["repo_owner"] = repo_config["owner"]
+        metadata["repo_name"] = repo_config["name"]
+    if resolved_login:
+        metadata["github_login"] = resolved_login
+    if user_email:
+        metadata["triggering_user_email"] = user_email.strip().lower()
+    if title:
+        metadata["title"] = title[:80]
+    if source_context:
+        metadata["source_context"] = source_context
+
+    langgraph_client = get_client(url=LANGGRAPH_URL)
+    try:
+        existing = await langgraph_client.threads.get(thread_id)
+    except Exception as exc:  # noqa: BLE001
+        if not _is_not_found_error(exc):
+            logger.exception("Failed to read thread %s for owner metadata", thread_id)
+        existing = None
+
+    existing_meta = (
+        existing.get("metadata")
+        if isinstance(existing, dict) and isinstance(existing.get("metadata"), dict)
+        else {}
+    )
+    if existing_meta.get("created_at_ms") is None:
+        metadata["created_at_ms"] = now_ms
+    if existing_meta.get("title") and "title" in metadata:
+        # Preserve a title that was already chosen (first message wins).
+        metadata.pop("title")
+
+    try:
+        if existing is None:
+            await langgraph_client.threads.create(
+                thread_id=thread_id, if_exists="do_nothing", metadata=metadata
+            )
+        else:
+            await langgraph_client.threads.update(thread_id=thread_id, metadata=metadata)
+    except Exception:  # noqa: BLE001
+        logger.exception("Failed to persist owner metadata for thread %s", thread_id)
+
+
 async def get_slack_repo_config(
     channel_id: str,
     thread_ts: str,
@@ -747,6 +810,15 @@ async def process_linear_issue(  # noqa: PLR0912, PLR0915
         "source": "linear",
     }
 
+    await upsert_agent_thread_owner_metadata(
+        thread_id,
+        source="linear",
+        repo_config=repo_config,
+        user_email=user_email or "",
+        title=title or identifier or "Linear issue",
+        source_context={"linear_issue": configurable["linear_issue"]},
+    )
+
     logger.info("Checking if thread %s is active before creating run", thread_id)
     thread_active = await is_thread_active(thread_id)
     logger.info("Thread %s active status: %s", thread_id, thread_active)
@@ -914,6 +986,14 @@ async def process_slack_mention(event_data: dict[str, Any], repo_config: dict[st
     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)
+    await upsert_agent_thread_owner_metadata(
+        thread_id,
+        source="slack",
+        repo_config=repo_config,
+        user_email=user_email or "",
+        title=clean_text if is_first_mention else "",
+        source_context={"slack_thread": configurable["slack_thread"]},
+    )
 
     thread_active = await is_thread_active(thread_id)
     if thread_active:
@@ -1392,6 +1472,14 @@ async def _trigger_or_queue_run(
     pr_number: int,
 ) -> None:
     """Create a new agent run or queue the message if the thread is busy."""
+    await upsert_agent_thread_owner_metadata(
+        thread_id,
+        source="github",
+        repo_config=repo_config,
+        github_login=github_login,
+        title=f"PR #{pr_number}" if pr_number else "",
+        source_context={"pr_number": pr_number} if pr_number else None,
+    )
     thread_active = await is_thread_active(thread_id)
     if thread_active:
         logger.info("Thread %s is busy, queuing GitHub PR comment message", thread_id)
@@ -2635,6 +2723,15 @@ async def process_github_issue(payload: dict[str, Any], event_type: str) -> None
         },
     }
 
+    await upsert_agent_thread_owner_metadata(
+        thread_id,
+        source="github",
+        repo_config=repo_config,
+        github_login=github_login,
+        title=title or (f"Issue #{issue_number}" if issue_number else ""),
+        source_context={"github_issue": configurable["github_issue"]},
+    )
+
     thread_active = await is_thread_active(thread_id)
     if thread_active:
         logger.info("Thread %s is busy, queuing GitHub issue message", thread_id)
diff --git a/ui/src/components/agents/AgentRunCard.tsx b/ui/src/components/agents/AgentRunCard.tsx
index 31de47d9..aafe4a4c 100644
--- a/ui/src/components/agents/AgentRunCard.tsx
+++ b/ui/src/components/agents/AgentRunCard.tsx
@@ -1,10 +1,26 @@
 import { Link } from "@tanstack/react-router";
-import { CheckCircleIcon, GitBranchIcon, GitPullRequestIcon } from "@phosphor-icons/react";
+import {
+  ChatCircleIcon,
+  CheckCircleIcon,
+  GitBranchIcon,
+  GitPullRequestIcon,
+  GithubLogoIcon,
+  KanbanIcon,
+  SlackLogoIcon,
+} from "@phosphor-icons/react";
+import type { Icon } from "@phosphor-icons/react";
 
+import type { AgentSource, AgentThread } from "@/lib/agents/types";
 import { formatRelativeTime } from "@/lib/agents/api";
-import type { AgentThread } from "@/lib/agents/types";
 import { cn } from "@/lib/utils";
 
+const SOURCE_META: Record<AgentSource, { icon: Icon; label: string }> = {
+  dashboard: { icon: ChatCircleIcon, label: "Dashboard" },
+  github: { icon: GithubLogoIcon, label: "GitHub" },
+  slack: { icon: SlackLogoIcon, label: "Slack" },
+  linear: { icon: KanbanIcon, label: "Linear" },
+};
+
 interface AgentRunCardProps {
   thread: AgentThread;
 }
@@ -12,6 +28,8 @@ interface AgentRunCardProps {
 export function AgentRunCard({ thread }: AgentRunCardProps) {
   const stats = thread.diffStats;
   const hasPr = Boolean(thread.pr);
+  const source = thread.source ? SOURCE_META[thread.source] : null;
+  const SourceIcon = source?.icon;
 
   return (
     <Link
@@ -51,6 +69,15 @@ export function AgentRunCard({ thread }: AgentRunCardProps) {
       <div className="min-w-0 flex-1">
         <div className="truncate text-sm font-medium text-[var(--ui-text)]">{thread.title}</div>
         <div className="mt-1 flex items-center gap-2 text-xs text-[var(--ui-text-dim)]">
+          {source && SourceIcon && (
+            <>
+              <span className="flex items-center gap-1" title={source.label}>
+                <SourceIcon className="size-3.5" weight="fill" aria-label={source.label} />
+                {source.label}
+              </span>
+              <span>·</span>
+            </>
+          )}
           <span>{thread.model}</span>
           <span>·</span>
           <span>{thread.repo}</span>
diff --git a/ui/src/components/agents/AgentsSidebar.tsx b/ui/src/components/agents/AgentsSidebar.tsx
index e7bc5640..7accf2b4 100644
--- a/ui/src/components/agents/AgentsSidebar.tsx
+++ b/ui/src/components/agents/AgentsSidebar.tsx
@@ -1,7 +1,17 @@
 import { Link } from "@tanstack/react-router";
-import { ChartLineUpIcon, PlusIcon, XIcon } from "@phosphor-icons/react";
+import {
+  ChartLineUpIcon,
+  ChatCircleIcon,
+  GithubLogoIcon,
+  KanbanIcon,
+  PlusIcon,
+  SlackLogoIcon,
+  XIcon,
+} from "@phosphor-icons/react";
+import type { Icon } from "@phosphor-icons/react";
 
 import type { SessionUser } from "@/lib/api";
+import type { AgentSource, AgentThread } from "@/lib/agents/types";
 import { SidebarUserMenu } from "@/components/SidebarUserMenu";
 import {
   SidebarCollapseButton,
@@ -10,9 +20,15 @@ import {
 } from "@/components/sidebar-layout";
 import { groupThreads } from "@/lib/agents/api";
 import { useAgentThreads, useDeleteAgentThread } from "@/lib/agents/queries";
-import type { AgentThread } from "@/lib/agents/types";
 import { cn } from "@/lib/utils";
 
+const SOURCE_META: Record<AgentSource, { icon: Icon; label: string }> = {
+  dashboard: { icon: ChatCircleIcon, label: "Started from the dashboard" },
+  github: { icon: GithubLogoIcon, label: "Triggered from GitHub" },
+  slack: { icon: SlackLogoIcon, label: "Triggered from Slack" },
+  linear: { icon: KanbanIcon, label: "Triggered from Linear" },
+};
+
 interface AgentsSidebarProps {
   user: SessionUser;
   activeThreadId?: string;
@@ -117,6 +133,9 @@ function ThreadRow({ thread, isActive }: { thread: AgentThread; isActive: boolea
     deleteThread.mutate(thread.id);
   };
 
+  const source = thread.source && thread.source !== "dashboard" ? SOURCE_META[thread.source] : null;
+  const SourceIcon = source?.icon;
+
   return (
     <Link
       to="/agents/$threadId"
@@ -139,6 +158,15 @@ function ThreadRow({ thread, isActive }: { thread: AgentThread; isActive: boolea
               : "bg-[var(--ui-border)]",
         )}
       />
+      {source && SourceIcon && (
+        <SourceIcon
+          className="size-3.5 shrink-0 text-[var(--ui-text-dim)]"
+          weight="fill"
+          aria-label={source.label}
+        >
+          <title>{source.label}</title>
+        </SourceIcon>
+      )}
       <span className="min-w-0 flex-1 truncate text-xs">{thread.title}</span>
       {badge && (
         <span className="shrink-0 rounded bg-[var(--ui-panel-2)] px-1.5 py-0.5 text-[10px] text-[var(--ui-text-dim)] group-hover:hidden">
diff --git a/ui/src/lib/agents/types.ts b/ui/src/lib/agents/types.ts
index a0a0016d..804c441a 100644
--- a/ui/src/lib/agents/types.ts
+++ b/ui/src/lib/agents/types.ts
@@ -13,6 +13,8 @@ export type TodoStatus = "pending" | "in_progress" | "completed";
 
 export type AgentStatus = "idle" | "running" | "finished" | "interrupted" | "error";
 
+export type AgentSource = "dashboard" | "github" | "slack" | "linear";
+
 export interface TodoItem {
   content: string;
   status: TodoStatus;
@@ -128,6 +130,7 @@ export interface AgentThread {
   branch: string;
   model: string;
   effort?: string | null;
+  source?: AgentSource;
   status: AgentStatus;
   createdAt: number;
   updatedAt: number;