diff --git a/agent-team/tests/test_gate_kind_coverage.py b/agent-team/tests/test_gate_kind_coverage.py
new file mode 100644
index 0000000..dfcd788
--- /dev/null
+++ b/agent-team/tests/test_gate_kind_coverage.py
@@ -0,0 +1,79 @@
+"""Guard: every ``pending_questions`` ``kind`` has a coordinator delivery path.
+
+A human-gate interrupt ``kind`` is NOT delivered for free. The responder/notify
+path is not kind-agnostic: a ``kind`` added to the ``pending_questions`` CHECK
+without a coordinator branch makes the task suspend FOREVER — no Slack post, no
+durable ledger row, the human can never answer. That was a real CRITICAL gap
+when ``confluence_approval`` was first wired (the node + graph were complete but
+the coordinator only branched on ``plan_decision``). See the memory
+``reference_agent_team_extension_gotchas``.
+
+This test pins the invariant from the schema (the single source of truth for
+allowed kinds): every non-default kind must have a ``*_KIND`` constant in
+``agent_team.graph`` AND an explicit reference to it in ``coordinator.py`` (its
+delivery branch). A new kind therefore cannot ship without its delivery wiring.
+"""
+
+from __future__ import annotations
+
+import re
+from pathlib import Path
+
+from agent_team import coordinator as coordinator_mod
+from agent_team import graph as graph_mod
+from agent_team.db import schema as schema_mod
+
+# ``clarify`` is delivered by the DEFAULT notify path (the fallthrough in
+# ``_post_resume_followups`` / ``start_task``), so it needs no dedicated branch.
+# Every OTHER kind must be keyed on its own ``graph.*_KIND`` constant.
+_DEFAULT_DELIVERED_KINDS = {"clarify"}
+
+
+def _declared_kinds() -> set[str]:
+    """The kind values the ``pending_questions`` CHECK allows (source of truth)."""
+    match = re.search(r"kind IN \(([^)]*)\)", schema_mod.PENDING_QUESTIONS_DDL)
+    assert match, (
+        "could not find the pending_questions kind CHECK in PENDING_QUESTIONS_DDL"
+    )
+    return set(re.findall(r"'([^']+)'", match.group(1)))
+
+
+def _kind_constant_names() -> dict[str, str]:
+    """Map each kind VALUE to the ``graph.*_KIND`` constant NAME that holds it."""
+    out: dict[str, str] = {}
+    for name in dir(graph_mod):
+        if name.endswith("_KIND"):
+            value = getattr(graph_mod, name)
+            if isinstance(value, str):
+                out[value] = name
+    return out
+
+
+def test_declared_kinds_parse_sane() -> None:
+    # Guards the regex itself: if PENDING_QUESTIONS_DDL is reshaped and the CHECK
+    # stops parsing, this fails loudly instead of silently passing an empty set.
+    kinds = _declared_kinds()
+    assert {"clarify", "plan_decision"} <= kinds
+
+
+def test_every_pending_question_kind_has_coordinator_delivery() -> None:
+    kinds = _declared_kinds()
+    constants = _kind_constant_names()
+    coordinator_src = Path(coordinator_mod.__file__).read_text()
+
+    for kind in sorted(kinds - _DEFAULT_DELIVERED_KINDS):
+        const = constants.get(kind)
+        assert const, (
+            f"pending_questions kind {kind!r} has no `*_KIND` constant in "
+            "agent_team.graph — define one and give it a coordinator delivery "
+            "branch (see reference_agent_team_extension_gotchas)."
+        )
+        assert f"graph_mod.{const}" in coordinator_src, (
+            f"pending_questions kind {kind!r} ({const}) has no delivery branch in "
+            "coordinator.py — a kind added to the CHECK without a coordinator "
+            "branch suspends the task forever (no Slack post, no ledger row). Add "
+            "a branch keyed on graph_mod." + (const or "<KIND>") + " in "
+            "_post_resume_followups, start_task, AND the redelivery sweep, and "
+            "make the interrupt payload carry a question_set "
+            "(see reference_agent_team_extension_gotchas)."
+        )