diff --git a/libs/hackbot-runtime/hackbot_runtime/actions/handlers/slack_handler.py b/libs/hackbot-runtime/hackbot_runtime/actions/handlers/slack_handler.py
index d703b4338b..829235b8c5 100644
--- a/libs/hackbot-runtime/hackbot_runtime/actions/handlers/slack_handler.py
+++ b/libs/hackbot-runtime/hackbot_runtime/actions/handlers/slack_handler.py
@@ -17,6 +17,7 @@
 from slack_sdk import WebClient
 
 from hackbot_runtime.actions.handlers.base import ActionResult, ApplyContext
+from hackbot_runtime.actions.slack import HACKBOT_UI_URL
 
 log = logging.getLogger(__name__)
 
@@ -36,11 +37,30 @@ def _client() -> WebClient:
 class PostMessageHandler:
     async def apply(self, params: dict[str, Any], ctx: ApplyContext) -> ActionResult:
         channel = params["channel"]
+        metadata = {
+            "event_type": "notification",
+            "event_payload": {
+                "notification_type": "info",
+                "source": {
+                    "ref_id": ctx.run_id,
+                    "ref_url": f"{HACKBOT_UI_URL}/runs/{ctx.run_id}",
+                },
+                "context": {
+                    "agent": ctx.agent,
+                    "run_id": ctx.run_id,
+                },
+            },
+        }
+
         try:
             # Slack reports application errors in a 200 body; the SDK raises
             # ``SlackApiError`` on them, so "channel_not_found" cannot read as a
             # delivered message.
-            response = _client().chat_postMessage(channel=channel, text=params["text"])
+            response = _client().chat_postMessage(
+                channel=channel,
+                text=params["text"],
+                metadata=metadata,
+            )
         except Exception as exc:
             log.exception("Failed to post to Slack channel %s", channel)
             return ActionResult.failed(str(exc))
diff --git a/libs/hackbot-runtime/tests/test_slack_handler.py b/libs/hackbot-runtime/tests/test_slack_handler.py
index 361b7947c3..fd50ad48dc 100644
--- a/libs/hackbot-runtime/tests/test_slack_handler.py
+++ b/libs/hackbot-runtime/tests/test_slack_handler.py
@@ -42,18 +42,6 @@ def _fake_client(monkeypatch, error=None):
     return client
 
 
-async def test_posts_recorded_message_and_returns_the_timestamp(monkeypatch):
-    client = _fake_client(monkeypatch)
-    result = await slack_handler.PostMessageHandler().apply(
-        {"channel": "#sheriff-notifications", "text": "a test regressed"}, _ctx()
-    )
-    assert client.calls == [
-        {"channel": "#sheriff-notifications", "text": "a test regressed"}
-    ]
-    assert result.status == "applied"
-    assert result.result == {"channel": "C1", "ts": "1700000000.000100"}
-
-
 async def test_posts_to_a_channel_id_as_recorded(monkeypatch):
     client = _fake_client(monkeypatch)
     await slack_handler.PostMessageHandler().apply(