refactor: add neutral mcp tool wrapper events

docs/current_roadmap.md

@@ -342,6 +342,9 @@ implementation state.
     - Completed: MCP JSON-schema-to-Pydantic model helper now lives in
       `wf_sources_mcp.schema_models`. `wf_mcp.workflow.wrappers` still owns
       tool wrapper event emission, but no longer owns the shared schema compiler.
+    - Completed: MCP tool wrapper event emission now uses neutral
+      `wf_sources_mcp.tool_events` DTOs. Broker discovery projects those events
+      into `McpEvent`, preparing `wrap_discovered_tool` for a package move.
     The `wf-mcp` script is now a legacy/special-purpose MCP entrypoint, not the
     preferred durable workflow server. New product paths should target
     `wf-rpc-server` plus neutral `wf_config`/`wf_server` composition, then keep

docs/historical/superpowers/plans/2026-06-08-tool-wrapper-event-seam.md

@@ -0,0 +1,641 @@
+# MCP Tool Wrapper Event Seam Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Remove direct `wf_mcp` event construction from `wrap_discovered_tool` so the wrapper can move to `wf_sources_mcp` in the next slice.
+
+**Architecture:** Add a neutral `ToolWrapperEvent` DTO in `wf_sources_mcp.tool_events`. `wf_mcp.workflow.wrappers.wrap_discovered_tool` emits this neutral DTO. `wf_mcp.broker.discovery.specs_from_discovered_tools` adapts neutral wrapper events into broker-local `McpEvent` via `make_event`, preserving external event behavior.
+
+**Tech Stack:** Python 3.14, dataclasses, `wf_authoring.NodeSpec`, `wf_sources_mcp` DTOs, pytest, ruff, basedpyright.
+
+---
+
+## Hard Boundaries
+
+- Do not move `wrap_discovered_tool` in this slice.
+- Do not move `specs_from_discovered_tools` in this slice.
+- Do not change broker event kinds or payload shapes.
+- Do not import `wf_mcp.events`, `wf_mcp.broker.events`, or `McpEvent` from `wf_mcp.workflow.wrappers`.
+- Do not add any `wf_mcp` imports to `src/wf_sources_mcp/tool_events.py`.
+- Preserve `wrap_discovered_tool(..., emit_event=...)` parameter name, but change its event object to neutral `ToolWrapperEvent`.
+- Do not commit unless the caller explicitly asks for a commit.
+
+## File Map
+
+- Create `src/wf_sources_mcp/tool_events.py`: neutral `ToolWrapperEvent`, `ToolWrapperEventSink`, and small factories.
+- Modify `src/wf_sources_mcp/__init__.py`: export `ToolWrapperEvent`, `ToolWrapperEventSink`, `tool_call_started_event`, `tool_call_completed_event`.
+- Modify `src/wf_mcp/workflow/wrappers.py`: emit neutral events instead of broker `McpEvent`.
+- Modify `src/wf_mcp/broker/discovery.py`: adapt neutral events to broker-local `McpEvent`.
+- Create `tests/wf_sources_mcp/test_tool_events.py`: canonical neutral event tests.
+- Modify `tests/wf_mcp/test_workflow_wrappers.py`: add direct neutral event emission test.
+- Modify `tests/wf_mcp/service/test_events.py`: keep existing broker event behavior passing.
+- Modify `tests/wf_sources_mcp/test_import_direction_guard.py`: forbid old broker event imports inside `wf_sources_mcp`.
+- Modify docs: `docs/current_roadmap.md` and `docs/superpowers/specs/2026-06-03-long-lived-workflow-api-boundary.md`.
+- Move this plan to `docs/historical/superpowers/plans/` after implementation is verified.
+
+---
+
+### Task 1: Add Canonical Neutral Tool Event Tests
+
+**Files:**
+- Create: `tests/wf_sources_mcp/test_tool_events.py`
+
+- [ ] **Step 1: Write tests for neutral event DTO/factories**
+
+Create `tests/wf_sources_mcp/test_tool_events.py`:
+
+```python
+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}}
+```
+
+- [ ] **Step 2: Run tests and verify they fail**
+
+Run:
+
+```bash
+uv run pytest tests/wf_sources_mcp/test_tool_events.py -q
+```
+
+Expected: fail with `ModuleNotFoundError` or import error for `wf_sources_mcp.tool_events`.
+
+---
+
+### Task 2: Create `wf_sources_mcp.tool_events`
+
+**Files:**
+- Create: `src/wf_sources_mcp/tool_events.py`
+
+- [ ] **Step 1: Add neutral event DTO and factories**
+
+Create `src/wf_sources_mcp/tool_events.py`:
+
+```python
+from __future__ import annotations
+
+from collections.abc import Callable
+from dataclasses import dataclass, field
+from typing import Any
+
+
+@dataclass(frozen=True, slots=True)
+class ToolWrapperEvent:
+    """Neutral tool-wrapper event before broker-specific event projection."""
+
+    kind: str
+    connection_id: str
+    capability_id: str
+    payload: dict[str, Any] = field(default_factory=dict)
+
+
+ToolWrapperEventSink = Callable[[ToolWrapperEvent], None]
+
+
+def tool_call_started_event(
+    *,
+    connection_id: str,
+    capability_id: str,
+    input_payload: dict[str, Any],
+) -> ToolWrapperEvent:
+    return ToolWrapperEvent(
+        kind="tool_call_started",
+        connection_id=connection_id,
+        capability_id=capability_id,
+        payload={"input": input_payload},
+    )
+
+
+def tool_call_completed_event(
+    *,
+    connection_id: str,
+    capability_id: str,
+    outcome: str,
+    meta: dict[str, Any],
+) -> ToolWrapperEvent:
+    return ToolWrapperEvent(
+        kind="tool_call_completed",
+        connection_id=connection_id,
+        capability_id=capability_id,
+        payload={"outcome": outcome, "meta": meta},
+    )
+
+
+__all__ = [
+    "ToolWrapperEvent",
+    "ToolWrapperEventSink",
+    "tool_call_completed_event",
+    "tool_call_started_event",
+]
+```
+
+- [ ] **Step 2: Run canonical tests**
+
+Run:
+
+```bash
+uv run pytest tests/wf_sources_mcp/test_tool_events.py -q
+```
+
+Expected: pass.
+
+---
+
+### Task 3: Export Neutral Tool Event Symbols
+
+**Files:**
+- Modify: `src/wf_sources_mcp/__init__.py`
+- Modify: `tests/wf_sources_mcp/test_tool_events.py`
+
+- [ ] **Step 1: Add package-root exports**
+
+Update `src/wf_sources_mcp/__init__.py` so this works:
+
+```python
+from wf_sources_mcp import (
+    ToolWrapperEvent,
+    ToolWrapperEventSink,
+    tool_call_completed_event,
+    tool_call_started_event,
+)
+```
+
+If the package uses lazy `__getattr__`, add these names to `__all__` and route them to `.tool_events`:
+
+```python
+    if name in {
+        "ToolWrapperEvent",
+        "ToolWrapperEventSink",
+        "tool_call_completed_event",
+        "tool_call_started_event",
+    }:
+        from . import tool_events
+
+        return getattr(tool_events, name)
+```
+
+- [ ] **Step 2: Add package-root export test**
+
+Append to `tests/wf_sources_mcp/test_tool_events.py`:
+
+```python
+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
+```
+
+- [ ] **Step 3: Run canonical tests**
+
+Run:
+
+```bash
+uv run pytest tests/wf_sources_mcp/test_tool_events.py -q
+```
+
+Expected: pass.
+
+---
+
+### Task 4: Make `wrap_discovered_tool` Emit Neutral Events
+
+**Files:**
+- Modify: `src/wf_mcp/workflow/wrappers.py`
+- Modify: `tests/wf_mcp/test_workflow_wrappers.py`
+
+- [ ] **Step 1: Replace broker event imports**
+
+In `src/wf_mcp/workflow/wrappers.py`, remove:
+
+```python
+from wf_mcp.broker.events import McpEvent, make_event
+```
+
+Add:
+
+```python
+from wf_sources_mcp.tool_events import (
+    ToolWrapperEventSink,
+    tool_call_completed_event,
+    tool_call_started_event,
+)
+```
+
+- [ ] **Step 2: Change `emit_event` type**
+
+Change:
+
+```python
+emit_event: Callable[[McpEvent], None] | None = None,
+```
+
+to:
+
+```python
+emit_event: ToolWrapperEventSink | None = None,
+```
+
+If `Callable` is no longer used in the file, remove `from collections.abc import Callable`.
+
+- [ ] **Step 3: Emit neutral started event**
+
+Replace:
+
+```python
+emit_event(
+    make_event(
+        "tool_call_started",
+        connection_id=connection.id,
+        capability_id=f"{connection.id}.{tool.name}",
+        payload={"input": payload.model_dump(exclude_unset=True)},
+    )
+)
+```
+
+with:
+
+```python
+emit_event(
+    tool_call_started_event(
+        connection_id=connection.id,
+        capability_id=f"{connection.id}.{tool.name}",
+        input_payload=payload.model_dump(exclude_unset=True),
+    )
+)
+```
+
+- [ ] **Step 4: Emit neutral completed event**
+
+Replace:
+
+```python
+emit_event(
+    make_event(
+        "tool_call_completed",
+        connection_id=connection.id,
+        capability_id=f"{connection.id}.{tool.name}",
+        payload={
+            "outcome": result.outcome,
+            "meta": result.meta,
+        },
+    )
+)
+```
+
+with:
+
+```python
+emit_event(
+    tool_call_completed_event(
+        connection_id=connection.id,
+        capability_id=f"{connection.id}.{tool.name}",
+        outcome=result.outcome,
+        meta=result.meta,
+    )
+)
+```
+
+- [ ] **Step 5: Add direct wrapper neutral event test**
+
+Append to `tests/wf_mcp/test_workflow_wrappers.py`:
+
+```python
+def test_discovered_tool_wrapper_emits_neutral_tool_events() -> None:
+    events = []
+    spec = wrap_discovered_tool(
+        connection=McpSourceConnection(
+            id="everything.default",
+            provider="everything",
+            account="default",
+            transport=StdioSourceTransport(command="placeholder"),
+        ),
+        auth=None,
+        executor=cast(ToolExecutor, TextContentAdapter()),
+        tool=DiscoveredTool(
+            name="echo",
+            title="Echo",
+            description=None,
+            input_schema={
+                "type": "object",
+                "properties": {"message": {"type": "string"}},
+                "required": ["message"],
+            },
+            output_schema={
+                "type": "object",
+                "properties": {"content": {"type": "array"}},
+            },
+        ),
+        emit_event=events.append,
+    )
+    handler = build_async_registry(spec)[spec.name]
+
+    async def run_call() -> None:
+        await handler(
+            {"message": "hello"},
+            RuntimeContext(current_node_id="echo"),
+        )
+
+    asyncio.run(run_call())
+
+    assert [event.kind for event in events] == [
+        "tool_call_started",
+        "tool_call_completed",
+    ]
+    assert events[0].connection_id == "everything.default"
+    assert events[0].capability_id == "everything.default.echo"
+    assert events[0].payload == {"input": {"message": "hello"}}
+    assert events[1].payload["outcome"] == "ok"
+```
+
+- [ ] **Step 6: Run wrapper tests**
+
+Run:
+
+```bash
+uv run pytest tests/wf_mcp/test_workflow_wrappers.py -q
+```
+
+Expected: pass.
+
+---
+
+### Task 5: Adapt Neutral Events to Broker `McpEvent`
+
+**Files:**
+- Modify: `src/wf_mcp/broker/discovery.py`
+- Run: existing broker event tests
+
+- [ ] **Step 1: Import neutral event type and broker event factory**
+
+In `src/wf_mcp/broker/discovery.py`, add:
+
+```python
+from wf_sources_mcp.tool_events import ToolWrapperEvent
+```
+
+Change:
+
+```python
+from .events import McpEvent
+```
+
+to:
+
+```python
+from .events import McpEvent, make_event
+```
+
+- [ ] **Step 2: Add adapter helper**
+
+Add above `specs_from_discovered_tools`:
+
+```python
+def _project_tool_wrapper_event(event: ToolWrapperEvent) -> McpEvent:
+    return make_event(
+        event.kind,
+        connection_id=event.connection_id,
+        capability_id=event.capability_id,
+        payload=event.payload,
+    )
+```
+
+- [ ] **Step 3: Wrap `emit_event` when calling `wrap_discovered_tool`**
+
+Inside `specs_from_discovered_tools`, before the list comprehension:
+
+```python
+def emit_tool_event(event: ToolWrapperEvent) -> None:
+    if emit_event is not None:
+        emit_event(_project_tool_wrapper_event(event))
+```
+
+Then change the `wrap_discovered_tool` call argument from:
+
+```python
+emit_event=emit_event,
+```
+
+to:
+
+```python
+emit_event=emit_tool_event if emit_event is not None else None,
+```
+
+- [ ] **Step 4: Run broker event behavior tests**
+
+Run:
+
+```bash
+uv run pytest tests/wf_mcp/service/test_events.py::test_service_records_tool_call_events -q
+```
+
+Expected: pass. This confirms public broker `McpEvent` behavior is preserved.
+
+---
+
+### Task 6: Add Import Guard for Broker Event Dependency
+
+**Files:**
+- Modify: `tests/wf_sources_mcp/test_import_direction_guard.py`
+
+- [ ] **Step 1: Add forbidden broker event import test**
+
+Append to `tests/wf_sources_mcp/test_import_direction_guard.py`:
+
+```python
+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)
+    )
+```
+
+- [ ] **Step 2: Run import guards**
+
+Run:
+
+```bash
+uv run pytest tests/wf_sources_mcp/test_import_direction_guard.py -q
+```
+
+Expected: pass.
+
+---
+
+### Task 7: Update Docs and Archive Plan
+
+**Files:**
+- Modify: `docs/current_roadmap.md`
+- Modify: `docs/superpowers/specs/2026-06-03-long-lived-workflow-api-boundary.md`
+- Move: `docs/superpowers/plans/2026-06-08-tool-wrapper-event-seam.md` to `docs/historical/superpowers/plans/2026-06-08-tool-wrapper-event-seam.md`
+
+- [ ] **Step 1: Update `docs/current_roadmap.md`**
+
+Under the `wf_sources_mcp` cleanup section, add:
+
+```markdown
+    - Completed: MCP tool wrapper event emission now uses neutral
+      `wf_sources_mcp.tool_events` DTOs. Broker discovery projects those events
+      into `McpEvent`, preparing `wrap_discovered_tool` for a package move.
+```
+
+- [ ] **Step 2: Update `docs/superpowers/specs/2026-06-03-long-lived-workflow-api-boundary.md`**
+
+Add a completed numbered item before the pending upstream transport/discovery/session services item:
+
+```markdown
+18. Complete: MCP tool wrapper event emission now uses neutral
+    `wf_sources_mcp.tool_events` DTOs; `wf_mcp.broker.discovery` adapts them to
+    broker-local `McpEvent`. `wrap_discovered_tool` remains in `wf_mcp` until
+    the next move slice.
+```
+
+If numbering differs because new items landed meanwhile, keep the completed item before the broad pending item and renumber.
+
+- [ ] **Step 3: Archive the plan**
+
+Run:
+
+```bash
+git mv docs/superpowers/plans/2026-06-08-tool-wrapper-event-seam.md docs/historical/superpowers/plans/2026-06-08-tool-wrapper-event-seam.md
+```
+
+Expected: `git status --short` shows an `R` rename for the plan.
+
+---
+
+### Task 8: Final Verification
+
+**Files:**
+- No code edits unless verification finds a real issue.
+
+- [ ] **Step 1: Run focused tests**
+
+Run:
+
+```bash
+uv run pytest tests/wf_sources_mcp/test_tool_events.py tests/wf_sources_mcp/test_import_direction_guard.py tests/wf_mcp/test_workflow_wrappers.py tests/wf_mcp/service/test_events.py::test_service_records_tool_call_events tests/wf_mcp/service/test_catalog.py tests/wf_mcp/service/test_upstream_transport.py -q
+```
+
+Expected: all selected tests pass.
+
+- [ ] **Step 2: Run source-provider tests**
+
+Run:
+
+```bash
+uv run pytest tests/wf_sources_mcp -q
+```
+
+Expected: all `wf_sources_mcp` tests pass.
+
+- [ ] **Step 3: Run lint**
+
+Run:
+
+```bash
+uv run ruff check src/wf_sources_mcp/tool_events.py src/wf_mcp/workflow/wrappers.py src/wf_mcp/broker/discovery.py tests/wf_sources_mcp/test_tool_events.py tests/wf_sources_mcp/test_import_direction_guard.py tests/wf_mcp/test_workflow_wrappers.py
+```
+
+Expected: `All checks passed!`
+
+- [ ] **Step 4: Run typecheck**
+
+Run:
+
+```bash
+uv run basedpyright --level error src/wf_sources_mcp/tool_events.py src/wf_mcp/workflow/wrappers.py src/wf_mcp/broker/discovery.py tests/wf_sources_mcp/test_tool_events.py tests/wf_mcp/test_workflow_wrappers.py
+```
+
+Expected: `0 errors, 0 warnings, 0 notes`
+
+- [ ] **Step 5: Check old wrapper event imports**
+
+Run:
+
+```bash
+rg -n "wf_mcp\\.broker\\.events|wf_mcp\\.events|McpEvent|make_event|ToolWrapperEvent" src\\wf_mcp\\workflow src\\wf_sources_mcp src\\wf_mcp\\broker\\discovery.py tests
+```
+
+Expected:
+
+- `src/wf_mcp/workflow/wrappers.py` must not import `McpEvent`, `make_event`, `wf_mcp.events`, or `wf_mcp.broker.events`.
+- `src/wf_mcp/broker/discovery.py` may import `McpEvent`, `make_event`, and `ToolWrapperEvent`.
+- `src/wf_sources_mcp` may define/use `ToolWrapperEvent` but must not import `wf_mcp.events` or `wf_mcp.broker.events`.
+
+- [ ] **Step 6: Check whitespace**
+
+Run:
+
+```bash
+git diff --check
+```
+
+Expected: no whitespace errors. CRLF warnings on Windows are acceptable.
+
+---
+
+## Expected Final Report
+
+The implementer should report:
+
+- Files created, modified, and moved.
+- Exact verification commands and pass/fail output.
+- Confirmation that `wf_mcp.workflow.wrappers` no longer imports broker event modules.
+- Confirmation that broker tool-call event behavior still emits `McpEvent` with `tool_call_started` and `tool_call_completed`.
+- Confirmation that `wrap_discovered_tool` still lives in `wf_mcp`.
+- Any deviations from this plan.
+
+Do not claim "full suite passed" unless the full suite was actually run.

docs/superpowers/specs/2026-06-03-long-lived-workflow-api-boundary.md

@@ -137,7 +137,11 @@ First slices should move leaf modules only and leave `wf_mcp` re-export shims:
     `wf_sources_mcp.schema_models`. This removes the broker catalog hydration
     dependency on private `wf_mcp.workflow.wrappers` helpers; eventful tool
     wrapping remains in `wf_mcp` for the next seam.
-18. Upstream transport/discovery/session services.
+18. Complete: MCP tool wrapper event emission now uses neutral
+    `wf_sources_mcp.tool_events` DTOs; `wf_mcp.broker.discovery` adapts them to
+    broker-local `McpEvent`. `wrap_discovered_tool` remains in `wf_mcp` until
+    the next move slice.
+19. Upstream transport/discovery/session services.
 
 Each slice should add import-direction tests so the new source-provider package
 does not depend on `wf_mcp.workflow_surface`, `wf_mcp.admin_surface`,

src/wf_mcp/broker/discovery.py

@@ -11,11 +11,21 @@ from wf_sources_mcp.discovery import (
     discover_connection_capabilities,
 )
 from wf_sources_mcp.sdk import ToolExecutor
+from wf_sources_mcp.tool_events import ToolWrapperEvent
 
 from ..auth import AuthRecord
 from ..models import ConnectionConfig
 from ..workflow import wrap_discovered_tool
-from .events import McpEvent
+from .events import McpEvent, make_event
+
+
+def _project_tool_wrapper_event(event: ToolWrapperEvent) -> McpEvent:
+    return make_event(
+        event.kind,
+        connection_id=event.connection_id,
+        capability_id=event.capability_id,
+        payload=event.payload,
+    )
 
 
 def specs_from_discovered_tools(
@@ -30,13 +40,18 @@ def specs_from_discovered_tools(
     # internals use McpSourceConnection so the session code can move to
     # wf_sources_mcp in a later slice.
     source_connection = mcp_source_connection_from_connection_config(connection)
+
+    def emit_tool_event(event: ToolWrapperEvent) -> None:
+        if emit_event is not None:
+            emit_event(_project_tool_wrapper_event(event))
+
     return [
         wrap_discovered_tool(
             connection=source_connection,
             auth=auth,
             executor=executor,
             tool=tool,
-            emit_event=emit_event,
+            emit_event=emit_tool_event if emit_event is not None else None,
         )
         for tool in tools
     ]

src/wf_mcp/workflow/wrappers.py

@@ -1,17 +1,19 @@
 from __future__ import annotations
 
-from collections.abc import Callable
-
 from pydantic import BaseModel
 
 from wf_authoring import NodeReturn, NodeSpec
 from wf_core import RuntimeContext
-from wf_mcp.broker.events import McpEvent, make_event
 from wf_sources_mcp.auth import AuthRecord
 from wf_sources_mcp.catalog import DiscoveredTool
 from wf_sources_mcp.connections import McpSourceConnection
 from wf_sources_mcp.schema_models import model_from_schema
 from wf_sources_mcp.sdk import ToolExecutor
+from wf_sources_mcp.tool_events import (
+    ToolWrapperEventSink,
+    tool_call_completed_event,
+    tool_call_started_event,
+)
 
 _model_from_schema = model_from_schema
 
@@ -22,7 +24,7 @@ def wrap_discovered_tool(
     auth: AuthRecord | None,
     executor: ToolExecutor,
     tool: DiscoveredTool,
-    emit_event: Callable[[McpEvent], None] | None = None,
+    emit_event: ToolWrapperEventSink | None = None,
 ) -> NodeSpec[BaseModel, BaseModel]:
     input_model = model_from_schema(
         f"{connection.id}_{tool.name}_Input",
@@ -39,11 +41,10 @@ def wrap_discovered_tool(
     ) -> NodeReturn[BaseModel]:
         if emit_event is not None:
             emit_event(
-                make_event(
-                    "tool_call_started",
+                tool_call_started_event(
                     connection_id=connection.id,
                     capability_id=f"{connection.id}.{tool.name}",
-                    payload={"input": payload.model_dump(exclude_unset=True)},
+                    input_payload=payload.model_dump(exclude_unset=True),
                 )
             )
         result = await executor.call_tool(
@@ -56,14 +57,11 @@ def wrap_discovered_tool(
         )
         if emit_event is not None:
             emit_event(
-                make_event(
-                    "tool_call_completed",
+                tool_call_completed_event(
                     connection_id=connection.id,
                     capability_id=f"{connection.id}.{tool.name}",
-                    payload={
-                        "outcome": result.outcome,
-                        "meta": result.meta,
-                    },
+                    outcome=result.outcome,
+                    meta=result.meta,
                 )
             )
         return NodeReturn(

src/wf_sources_mcp/__init__.py

@@ -65,6 +65,10 @@ __all__ = [
     "model_from_schema",
     "neutral_auth_from_mcp",
     "registry_entry_to_connection_config",
+    "tool_call_completed_event",
+    "tool_call_started_event",
+    "ToolWrapperEvent",
+    "ToolWrapperEventSink",
     "workflow_mcp_source_to_connection_config",
 ]
 
@@ -109,4 +113,13 @@ def __getattr__(name: str) -> object:
         from . import schema_models
 
         return schema_models.model_from_schema
+    if name in {
+        "ToolWrapperEvent",
+        "ToolWrapperEventSink",
+        "tool_call_completed_event",
+        "tool_call_started_event",
+    }:
+        from . import tool_events
+
+        return getattr(tool_events, name)
     raise AttributeError(f"module {__name__!r} has no attribute {name!r}")

src/wf_sources_mcp/tool_events.py

@@ -0,0 +1,55 @@
+from __future__ import annotations
+
+from collections.abc import Callable
+from dataclasses import dataclass, field
+from typing import Any
+
+
+@dataclass(frozen=True, slots=True)
+class ToolWrapperEvent:
+    """Neutral tool-wrapper event before broker-specific event projection."""
+
+    kind: str
+    connection_id: str
+    capability_id: str
+    payload: dict[str, Any] = field(default_factory=dict)
+
+
+ToolWrapperEventSink = Callable[[ToolWrapperEvent], None]
+
+
+def tool_call_started_event(
+    *,
+    connection_id: str,
+    capability_id: str,
+    input_payload: dict[str, Any],
+) -> ToolWrapperEvent:
+    return ToolWrapperEvent(
+        kind="tool_call_started",
+        connection_id=connection_id,
+        capability_id=capability_id,
+        payload={"input": input_payload},
+    )
+
+
+def tool_call_completed_event(
+    *,
+    connection_id: str,
+    capability_id: str,
+    outcome: str,
+    meta: dict[str, Any],
+) -> ToolWrapperEvent:
+    return ToolWrapperEvent(
+        kind="tool_call_completed",
+        connection_id=connection_id,
+        capability_id=capability_id,
+        payload={"outcome": outcome, "meta": meta},
+    )
+
+
+__all__ = [
+    "ToolWrapperEvent",
+    "ToolWrapperEventSink",
+    "tool_call_completed_event",
+    "tool_call_started_event",
+]

tests/wf_mcp/test_workflow_wrappers.py

@@ -132,3 +132,50 @@ def test_discovered_tool_wrapper_preserves_raw_mcp_content_output() -> None:
     assert "text" not in result["output"]
     assert result["output"]["content"][0]["type"] == "text"
     assert result["output"]["content"][0]["text"] == "Echo: hello"
+
+
+def test_discovered_tool_wrapper_emits_neutral_tool_events() -> None:
+    events = []
+    spec = wrap_discovered_tool(
+        connection=McpSourceConnection(
+            id="everything.default",
+            provider="everything",
+            account="default",
+            transport=StdioSourceTransport(command="placeholder"),
+        ),
+        auth=None,
+        executor=cast(ToolExecutor, TextContentAdapter()),
+        tool=DiscoveredTool(
+            name="echo",
+            title="Echo",
+            description=None,
+            input_schema={
+                "type": "object",
+                "properties": {"message": {"type": "string"}},
+                "required": ["message"],
+            },
+            output_schema={
+                "type": "object",
+                "properties": {"content": {"type": "array"}},
+            },
+        ),
+        emit_event=events.append,
+    )
+    handler = build_async_registry(spec)[spec.name]
+
+    async def run_call() -> None:
+        await handler(
+            {"message": "hello"},
+            RuntimeContext(current_node_id="echo"),
+        )
+
+    asyncio.run(run_call())
+
+    assert [event.kind for event in events] == [
+        "tool_call_started",
+        "tool_call_completed",
+    ]
+    assert events[0].connection_id == "everything.default"
+    assert events[0].capability_id == "everything.default.echo"
+    assert events[0].payload == {"input": {"message": "hello"}}
+    assert events[1].payload["outcome"] == "ok"

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