refactor: add neutral mcp tool wrapper events

tests/wf_sources_mcp/test_import_direction_guard.py

@@ -173,3 +173,26 @@ def test_wf_sources_mcp_does_not_import_old_workflow_wrapper_module() -> None:
         "wf_sources_mcp still imports old wf_mcp workflow wrapper module:\n"
         + "\n".join(f"  {violation}" for violation in violations)
     )
+
+
+def test_wf_sources_mcp_does_not_import_old_broker_event_modules() -> None:
+    root = Path(__file__).resolve().parents[2] / "src" / "wf_sources_mcp"
+    forbidden = {"wf_mcp.events", "wf_mcp.broker.events"}
+    violations: list[str] = []
+
+    for py_file in sorted(root.rglob("*.py")):
+        rel = py_file.relative_to(root.parent)
+        module = str(rel.with_suffix("")).replace("/", ".").replace("\\", ".")
+        tree = ast.parse(py_file.read_text(encoding="utf-8"), filename=str(py_file))
+        for node in ast.walk(tree):
+            if isinstance(node, ast.ImportFrom) and node.module in forbidden:
+                violations.append(f"{module}:{node.lineno}: from {node.module} import ...")
+            elif isinstance(node, ast.Import):
+                for alias in node.names:
+                    if alias.name in forbidden:
+                        violations.append(f"{module}:{node.lineno}: import {alias.name}")
+
+    assert violations == [], (
+        "wf_sources_mcp still imports old wf_mcp broker event modules:\n"
+        + "\n".join(f"  {violation}" for violation in violations)
+    )

tests/wf_sources_mcp/test_tool_events.py

@@ -0,0 +1,45 @@
+from __future__ import annotations
+
+from wf_sources_mcp.tool_events import (
+    ToolWrapperEvent,
+    tool_call_completed_event,
+    tool_call_started_event,
+)
+
+
+def test_tool_call_started_event_shape() -> None:
+    event = tool_call_started_event(
+        connection_id="demo.default",
+        capability_id="demo.default.echo",
+        input_payload={"message": "hello"},
+    )
+
+    assert event == ToolWrapperEvent(
+        kind="tool_call_started",
+        connection_id="demo.default",
+        capability_id="demo.default.echo",
+        payload={"input": {"message": "hello"}},
+    )
+
+
+def test_tool_call_completed_event_shape() -> None:
+    event = tool_call_completed_event(
+        connection_id="demo.default",
+        capability_id="demo.default.echo",
+        outcome="ok",
+        meta={"duration_ms": 3},
+    )
+
+    assert event.kind == "tool_call_completed"
+    assert event.connection_id == "demo.default"
+    assert event.capability_id == "demo.default.echo"
+    assert event.payload == {"outcome": "ok", "meta": {"duration_ms": 3}}
+
+
+def test_tool_event_symbols_export_from_package_root() -> None:
+    from wf_sources_mcp import ToolWrapperEvent as RootToolWrapperEvent
+    from wf_sources_mcp import tool_call_started_event as root_started
+    from wf_sources_mcp.tool_events import ToolWrapperEvent, tool_call_started_event
+
+    assert RootToolWrapperEvent is ToolWrapperEvent
+    assert root_started is tool_call_started_event