diff --git a/gateway/platforms/webhook.py b/gateway/platforms/webhook.py
index 222adf4c2ea1..2c1c03fe8494 100644
--- a/gateway/platforms/webhook.py
+++ b/gateway/platforms/webhook.py
@@ -500,6 +500,28 @@ async def _handle_webhook(self, request: "web.Request") -> "web.Response":
                 {"status": "ignored", "event": event_type}
             )
 
+        # Check action filter (e.g. gate a pull_request route to just
+        # opened/reopened/synchronize so a single human operation doesn't
+        # spawn a run on every action GitHub emits).
+        #
+        # Fail-open on a missing/empty action: the `and action` clause means a
+        # delivery whose payload carries no `action` field is processed rather
+        # than ignored, even when an allow-list is configured. Real GitHub
+        # pull_request deliveries always carry an action; dropping an event we
+        # cannot classify would be worse than processing it.
+        allowed_actions = route_config.get("actions", [])
+        action = payload.get("action", "")
+        if allowed_actions and action and action not in allowed_actions:
+            logger.debug(
+                "[webhook] Ignoring action %s for route %s (allowed: %s)",
+                action,
+                route_name,
+                allowed_actions,
+            )
+            return web.json_response(
+                {"status": "ignored", "action": action}
+            )
+
         # Format prompt from template
         prompt_template = route_config.get("prompt", "")
         prompt = self._render_prompt(
diff --git a/scripts/release.py b/scripts/release.py
index 36cc15008a0b..7b50ccc4d1fc 100755
--- a/scripts/release.py
+++ b/scripts/release.py
@@ -114,6 +114,7 @@
     "github@aldo.pw": "aldoeliacim",
     "max@c60spaceship.com": "MaxFreedomPollard",
     "achaljhawar03@gmail.com": "achaljhawar",
+    "casey@geeknest.com": "cwest",
     "claytonchew@ClaytonMacMiniM4.local": "claytonchew",
     "hbentel@gmail.com": "hbentel",
     "JustinBao@outlook.com": "justinbao19",
diff --git a/tests/gateway/test_webhook_integration.py b/tests/gateway/test_webhook_integration.py
index 9312ac0e999f..c97b5c277b04 100644
--- a/tests/gateway/test_webhook_integration.py
+++ b/tests/gateway/test_webhook_integration.py
@@ -143,6 +143,152 @@ async def _capture(event: MessageEvent):
         assert event.message_id == "gh-delivery-001"
 
 
+# ===================================================================
+# Test 1b: Action filter
+# ===================================================================
+
+class TestActionFilter:
+    """A route may declare an ``actions`` allow-list to gate which payload
+    actions trigger a run. This prevents a route subscribed to a whole event
+    (e.g. ``pull_request``) from firing on every action GitHub emits for one
+    human operation (opened, closed, reopened, synchronize, ...)."""
+
+    async def _post(self, routes, action):
+        """POST a PR payload with the given action; return (resp_json, events)."""
+        secret = "gh-webhook-test-secret"
+        adapter = _make_adapter(routes)
+
+        captured_events: list[MessageEvent] = []
+
+        async def _capture(event: MessageEvent):
+            captured_events.append(event)
+
+        adapter.handle_message = _capture
+
+        app = _create_app(adapter)
+        payload = {**GITHUB_PR_PAYLOAD, "action": action}
+        body = json.dumps(payload).encode()
+        sig = _github_signature(body, secret)
+
+        async with TestClient(TestServer(app)) as cli:
+            resp = await cli.post(
+                "/webhooks/github-pr",
+                data=body,
+                headers={
+                    "Content-Type": "application/json",
+                    "X-GitHub-Event": "pull_request",
+                    "X-Hub-Signature-256": sig,
+                    "X-GitHub-Delivery": f"gh-delivery-{action}",
+                },
+            )
+            data = await resp.json()
+
+        # Let any asyncio.create_task fire
+        await asyncio.sleep(0.05)
+        return data, captured_events
+
+    @pytest.mark.asyncio
+    async def test_disallowed_action_is_ignored(self):
+        """An action absent from the allow-list is dropped before dispatch."""
+        routes = {
+            "github-pr": {
+                "secret": "gh-webhook-test-secret",
+                "events": ["pull_request"],
+                "actions": ["opened", "reopened", "synchronize"],
+                "prompt": "Review PR #{number}",
+                "deliver": "log",
+            }
+        }
+        data, events = await self._post(routes, "closed")
+        assert data["status"] == "ignored"
+        assert data["action"] == "closed"
+        assert len(events) == 0
+
+    @pytest.mark.asyncio
+    async def test_allowed_action_passes(self):
+        """An action on the allow-list passes through to dispatch."""
+        routes = {
+            "github-pr": {
+                "secret": "gh-webhook-test-secret",
+                "events": ["pull_request"],
+                "actions": ["opened", "reopened", "synchronize"],
+                "prompt": "Review PR #{number}",
+                "deliver": "log",
+            }
+        }
+        for action in ("opened", "synchronize"):
+            data, events = await self._post(routes, action)
+            assert data["status"] == "accepted", action
+            assert len(events) == 1, action
+
+    @pytest.mark.asyncio
+    async def test_no_actions_filter_allows_all(self):
+        """With no ``actions`` configured, every action passes (backward-compat)."""
+        routes = {
+            "github-pr": {
+                "secret": "gh-webhook-test-secret",
+                "events": ["pull_request"],
+                "prompt": "Review PR #{number}",
+                "deliver": "log",
+            }
+        }
+        for action in ("opened", "closed", "reopened"):
+            data, events = await self._post(routes, action)
+            assert data["status"] == "accepted", action
+            assert len(events) == 1, action
+
+    @pytest.mark.asyncio
+    async def test_missing_action_fails_open(self):
+        """A delivery with no ``action`` field is processed even when an
+        allow-list is set (fail-open). Real GitHub pull_request deliveries
+        always carry an action; dropping an unclassifiable event would be worse
+        than processing it. This pins the ``and action`` clause of the guard so
+        a future tightening to ``action not in allowed_actions`` can't silently
+        start dropping action-less deliveries."""
+        secret = "gh-webhook-test-secret"
+        routes = {
+            "github-pr": {
+                "secret": secret,
+                "events": ["pull_request"],
+                "actions": ["opened", "reopened", "synchronize"],
+                "prompt": "Review PR #{number}",
+                "deliver": "log",
+            }
+        }
+        adapter = _make_adapter(routes)
+
+        captured_events: list[MessageEvent] = []
+
+        async def _capture(event: MessageEvent):
+            captured_events.append(event)
+
+        adapter.handle_message = _capture
+
+        app = _create_app(adapter)
+        # Payload with the action key removed entirely.
+        payload = {k: v for k, v in GITHUB_PR_PAYLOAD.items() if k != "action"}
+        assert "action" not in payload
+        body = json.dumps(payload).encode()
+        sig = _github_signature(body, secret)
+
+        async with TestClient(TestServer(app)) as cli:
+            resp = await cli.post(
+                "/webhooks/github-pr",
+                data=body,
+                headers={
+                    "Content-Type": "application/json",
+                    "X-GitHub-Event": "pull_request",
+                    "X-Hub-Signature-256": sig,
+                    "X-GitHub-Delivery": "gh-delivery-no-action",
+                },
+            )
+            data = await resp.json()
+
+        await asyncio.sleep(0.05)
+        assert data["status"] == "accepted"
+        assert len(captured_events) == 1
+
+
 # ===================================================================
 # Test 2: Skills injected into prompt
 # ===================================================================
diff --git a/website/docs/user-guide/messaging/webhooks.md b/website/docs/user-guide/messaging/webhooks.md
index d7678ba49f85..ad358c46602b 100644
--- a/website/docs/user-guide/messaging/webhooks.md
+++ b/website/docs/user-guide/messaging/webhooks.md
@@ -79,6 +79,7 @@ Routes define how different webhook sources are handled. Each route is a named e
 | Property | Required | Description |
 |----------|----------|-------------|
 | `events` | No | List of event types to accept (e.g. `["pull_request"]`). If empty, all events are accepted. Event type is read from `X-GitHub-Event`, `X-GitLab-Event`, or `event_type` in the payload. |
+| `actions` | No | List of payload `action` values to accept (e.g. `["opened", "reopened", "synchronize"]`). If empty, all actions are accepted. A delivery whose payload has no `action` field is always accepted (fail-open), even when this list is set. Use this to gate a route subscribed to a whole event — a single human operation on a pull request emits several deliveries (`opened`, `closed`, `reopened`, `synchronize`, …), and without an allow-list every one of them triggers a run. |
 | `secret` | **Yes** | HMAC secret for signature validation. Falls back to the global `secret` if not set on the route. Set to `"INSECURE_NO_AUTH"` for testing only (skips validation). |
 | `prompt` | No | Template string with dot-notation payload access (e.g. `{pull_request.title}`). If omitted, the full JSON payload is dumped into the prompt. |
 | `skills` | No | List of skill names to load for the agent run. |
@@ -98,6 +99,7 @@ platforms:
       routes:
         github-pr:
           events: ["pull_request"]
+          actions: ["opened", "reopened", "synchronize"]
           secret: "github-webhook-secret"
           prompt: |
             Review this pull request: