diff --git a/gateway/kanban_transition_emit.py b/gateway/kanban_transition_emit.py
index 81d53cf1bb26..939c7fb49a6e 100644
--- a/gateway/kanban_transition_emit.py
+++ b/gateway/kanban_transition_emit.py
@@ -88,6 +88,15 @@ def build_transition_payload(
         "task_id": task_id,
         "board": board,
         "kind": kind,
+        # The webhook adapter classifies an incoming event from (in order)
+        # the X-GitHub-Event / X-GitLab-Event headers, then body ``event_type``,
+        # then body ``type``. The loopback bridge sends none of those headers
+        # (its X-Kanban-Event header is not consulted for classification), so
+        # ``event_type`` in the BODY is what lets the adapter match this POST
+        # against the route's ``events`` allowlist and spawn the orchestrator
+        # run. Without it the adapter falls through to "unknown", returns
+        # {"status": "ignored"} with a 200, and no run fires. Mirror ``kind``.
+        "event_type": kind,
         "reason": reason or "",
         "title": title or "",
         "event_id": event_id,
diff --git a/tests/gateway/test_kanban_transition_emit.py b/tests/gateway/test_kanban_transition_emit.py
index d486122f4307..9769f2d073b6 100644
--- a/tests/gateway/test_kanban_transition_emit.py
+++ b/tests/gateway/test_kanban_transition_emit.py
@@ -91,6 +91,60 @@ def test_missing_reason_yields_empty_string_not_none():
     assert payload["reason"] == ""
 
 
+def test_payload_event_type_is_extractable_by_the_webhook_adapter():
+    """Regression: the built payload MUST carry the transition kind in a field
+    the webhook adapter's event-type extraction reads, or the route ignores it.
+
+    The adapter (gateway/platforms/webhook.py) resolves the incoming event type
+    from, in precedence order:
+
+        X-GitHub-Event header -> X-GitLab-Event header
+        -> payload["event_type"] -> payload["type"] -> "unknown"
+
+    The loopback emitter sends no GitHub/GitLab header, so the ONLY way the
+    adapter can classify a kanban transition is a body field. If the payload
+    lacks ``event_type``/``type``, extraction falls through to ``"unknown"``,
+    which is not in the route's ``events`` allowlist ([blocked, completed]) —
+    so the adapter returns ``{"status": "ignored"}`` with a 200 and NEVER
+    spawns the orchestrator run. That is the exact production symptom this
+    guards against (200 received, no agent run).
+
+    This test replicates the adapter's extraction precedence against the built
+    payload (no HTTP headers, mirroring the loopback POST) and asserts the
+    transition kind is recovered — i.e. the emitter and the adapter agree on
+    the wire contract.
+    """
+    kind = "blocked"
+    payload = build_transition_payload(
+        task_id="t_evt", board="default", kind=kind, reason="r", event_id=7,
+    )
+
+    # Replicate the adapter's exact extraction chain with NO request headers,
+    # which is how the loopback bridge POSTs (it uses X-Kanban-Event, a header
+    # the adapter does not consult for event classification).
+    headers: dict[str, str] = {}
+    event_type = (
+        headers.get("X-GitHub-Event", "")
+        or headers.get("X-GitLab-Event", "")
+        or payload.get("event_type", "")
+        or payload.get("type", "")
+        or "unknown"
+    )
+
+    assert event_type == kind, (
+        "adapter would classify the transition as %r, so a route filtering on "
+        "[blocked, completed] ignores it and no orchestrator run spawns" % event_type
+    )
+
+    # And an explicit allowlist check mirroring the adapter's filter:
+    allowed_events = ["blocked", "completed"]
+    assert event_type in allowed_events, (
+        "extracted event %r must be in the route allowlist so the POST "
+        "dispatches an agent run instead of returning {'status': 'ignored'}"
+        % event_type
+    )
+
+
 # --- Integration: the wired notifier loop actually invokes the bridge ----------
 
 import asyncio  # noqa: E402
diff --git a/tests/gateway/test_kanban_transition_emit_http.py b/tests/gateway/test_kanban_transition_emit_http.py
index a6b83f4d9c99..ad2dba24a407 100644
--- a/tests/gateway/test_kanban_transition_emit_http.py
+++ b/tests/gateway/test_kanban_transition_emit_http.py
@@ -30,6 +30,18 @@ async def handler(request):
         received["sig"] = request.headers.get("X-Hub-Signature-256")
         received["kind"] = request.headers.get("X-Kanban-Event")
         received["idem"] = request.headers.get("X-Idempotency-Key")
+        # Classify the event the way the real webhook adapter does — header
+        # first, then body ``event_type`` / ``type``. The loopback bridge
+        # sends no GitHub/GitLab header, so this exercises the body-field
+        # contract that lets a route actually dispatch (rather than 200-ignore).
+        parsed = json.loads(body)
+        received["adapter_event_type"] = (
+            request.headers.get("X-GitHub-Event", "")
+            or request.headers.get("X-GitLab-Event", "")
+            or parsed.get("event_type", "")
+            or parsed.get("type", "")
+            or "unknown"
+        )
         return web.json_response({"ok": True})
 
     async def scenario():
@@ -77,6 +89,15 @@ async def scenario():
     assert received["sig"] == expected, "HMAC signature must validate"
     assert received["kind"] == "blocked"
     assert received["idem"] == "kanban-transition:default:t_proof:blocked:99"
+    # The real adapter must be able to classify this as a 'blocked' event from
+    # the body alone (no GitHub/GitLab header on a loopback POST). If this is
+    # 'unknown', a route filtering on [blocked, completed] would 200-ignore the
+    # POST and never spawn the orchestrator run — the production regression.
+    assert received["adapter_event_type"] == "blocked", (
+        "adapter classified the loopback POST as %r; the route would ignore it"
+        % received["adapter_event_type"]
+    )
+    assert got["event_type"] == "blocked"
 
 
 if __name__ == "__main__":