More! Events!

docs/superpowers/plans/2026-05-12-unified-mcp-surface.md

@@ -325,10 +325,10 @@ config_reloaded
 - [ ] Add event kinds for capability changes:
   - `source_enabled`
   - `source_disabled`
-  - `catalog_changed`
-  - `tools_changed`
-  - `resources_changed`
-  - `prompts_changed`
+  - [x] `catalog_changed`
+  - [x] `tools_changed`
+  - [x] `resources_changed`
+  - [x] `prompts_changed`
 - [ ] Do not emit MCP notifications yet unless the server/session API is
   clearly available. This phase creates the source of truth.
 

src/wf_mcp/admin_surface/handlers/broker.py

@@ -69,7 +69,9 @@ class BrokerAdminHandlers:
         params: dict[str, Any] | None = None,
     ) -> dict[str, Any]:
         try:
-            return await self.service.invoke_method(connection_id, method, params=params)
+            return await self.service.invoke_method(
+                connection_id, method, params=params
+            )
         except Exception as exc:
             return {
                 "connection_id": connection_id,

src/wf_mcp/broker/service/core.py

@@ -141,6 +141,7 @@ class WfMcpService:
         connection_id: str,
         *specs: NodeSpec[Any, Any],
         max_age_seconds: int | None = None,
+        emit_change_events: bool = True,
     ) -> None:
         self.connections.get(connection_id)
         qualified_specs = {
@@ -181,6 +182,12 @@ class WfMcpService:
                 payload={"node_count": len(qualified_specs)},
             )
         )
+        if emit_change_events:
+            self._record_catalog_change_events(
+                connection_id,
+                snapshot,
+                reason="specs_registered",
+            )
 
     def get_catalog(self) -> CombinedCatalog:
         snapshots: dict[str, CatalogSnapshot] = {}
@@ -504,6 +511,7 @@ class WfMcpService:
                 connection_id,
                 *specs,
                 max_age_seconds=max_age_seconds,
+                emit_change_events=False,
             )
             snapshot = snapshot_from_specs(
                 connection_id,
@@ -518,6 +526,11 @@ class WfMcpService:
                 max_age_seconds=max_age_seconds or self.default_catalog_max_age_seconds,
             )
             self.store.save_catalog(snapshot)
+            self._record_catalog_change_events(
+                connection_id,
+                snapshot,
+                reason="catalog_refresh",
+            )
             self._record_event(
                 make_event(
                     "catalog_refresh_completed",
@@ -670,3 +683,51 @@ class WfMcpService:
 
     def _record_event(self, event: McpEvent) -> None:
         self.event_bus.publish(event)
+
+    def _record_catalog_change_events(
+        self,
+        connection_id: str,
+        snapshot: CatalogSnapshot,
+        *,
+        reason: str,
+    ) -> None:
+        """Emit local change events that future MCP notifications can project."""
+        counts = {
+            "node_count": len(snapshot.nodes),
+            "resource_count": len(snapshot.resources),
+            "prompt_count": len(snapshot.prompts),
+        }
+        if snapshot.nodes:
+            self._record_event(
+                make_event(
+                    "tools_changed",
+                    connection_id=connection_id,
+                    payload={"reason": reason, "node_count": counts["node_count"]},
+                )
+            )
+        if snapshot.resources:
+            self._record_event(
+                make_event(
+                    "resources_changed",
+                    connection_id=connection_id,
+                    payload={
+                        "reason": reason,
+                        "resource_count": counts["resource_count"],
+                    },
+                )
+            )
+        if snapshot.prompts:
+            self._record_event(
+                make_event(
+                    "prompts_changed",
+                    connection_id=connection_id,
+                    payload={"reason": reason, "prompt_count": counts["prompt_count"]},
+                )
+            )
+        self._record_event(
+            make_event(
+                "catalog_changed",
+                connection_id=connection_id,
+                payload={"reason": reason, **counts},
+            )
+        )

tests/wf_mcp/test_events.py

@@ -1,11 +1,14 @@
 from __future__ import annotations
 
+import asyncio
+from collections.abc import Sequence
+
 from wf_mcp.broker import WfMcpService
-from wf_mcp.events import EventBus, InMemoryEventSink, make_event
+from wf_mcp.events import EventBus, InMemoryEventSink, McpEvent, make_event
 from wf_mcp.models import ConnectionConfig
 from wf_mcp.storage import FileStore
 
-from .test_support import local_temp_root
+from .test_support import FakeAdapter, echo_tool, local_temp_root
 
 
 def test_event_bus_fans_out_to_subscribers() -> None:
@@ -35,3 +38,57 @@ def test_service_records_events_through_event_bus() -> None:
 
     assert service.list_events()[0].kind == "connection_registered"
     assert sink.list_events()[0] is service.list_events()[0]
+
+
+def test_register_specs_emits_tool_and_catalog_change_events() -> None:
+    service = WfMcpService(store=FileStore(local_temp_root() / "spec_change_store"))
+    service.register_connection(
+        ConnectionConfig(id="demo.personal", server="demo", account="personal")
+    )
+
+    service.register_specs("demo.personal", echo_tool)
+
+    events = service.list_events()
+    event_kinds = [event.kind for event in events]
+    tools_changed = [
+        event
+        for event in events
+        if event.kind == "tools_changed" and event.connection_id == "demo.personal"
+    ]
+    catalog_changed = [
+        event
+        for event in events
+        if event.kind == "catalog_changed" and event.connection_id == "demo.personal"
+    ]
+    assert "tools_changed" in event_kinds
+    assert "catalog_changed" in event_kinds
+    assert tools_changed[0].payload["node_count"] == 1
+    assert catalog_changed[0].payload["reason"] == "specs_registered"
+
+
+def test_refresh_catalog_emits_capability_change_events() -> None:
+    service = WfMcpService(store=FileStore(local_temp_root() / "refresh_change_store"))
+    service.register_connection(
+        ConnectionConfig(id="demo.personal", server="demo", account="personal")
+    )
+    service.register_adapter("demo", FakeAdapter())
+
+    asyncio.run(service.refresh_connection_catalog("demo.personal"))
+
+    events = service.list_events()
+    tools_changed = _first_event(events, "tools_changed")
+    resources_changed = _first_event(events, "resources_changed")
+    prompts_changed = _first_event(events, "prompts_changed")
+    catalog_changed = _first_event(events, "catalog_changed")
+    assert tools_changed.connection_id == "demo.personal"
+    assert tools_changed.payload["node_count"] == 1
+    assert resources_changed.payload["resource_count"] == 1
+    assert prompts_changed.payload["prompt_count"] == 1
+    assert catalog_changed.payload["reason"] == "catalog_refresh"
+
+
+def _first_event(events: Sequence[McpEvent], kind: str) -> McpEvent:
+    for event in events:
+        if event.kind == kind:
+            return event
+    raise AssertionError(f"expected event {kind!r}")