# Todo 43.1 Typed Event Consumer Regression Plan

**Status:** done

## Result

- Runtime now consumes typed ChatAgent `text_event` output.
- EventAgent now consumes typed provider `provider_tool_call` output.
- Realistic fixtures exposed and fixed the legacy consumer mismatch.
- Todo 43.2 completed strict source isolation and remaining fixture migration.

## Goal

Restore the existing dual-agent production paths after Todo 43 introduced typed stream kinds but legacy consumers and fixtures still listened for `kind="event"`.

## Scope

- Runtime consumes `text_event` from ChatAgent and preserves its name-only handoff behavior.
- EventAgent argument generation consumes `provider_tool_call` and preserves provider-generated arguments.
- Production-like test fixtures emit typed kinds instead of the legacy compatibility constructor.
- Keep `StreamItem.event(...)` only as a temporary compatibility API for unrelated callers; new/updated production-path tests must not use it.
- Do not add direct ChatAgent tool routing.

## Files

- Modify: `src/agent_lab/application/runtime.py`
- Modify: `src/agent_lab/application/event_agent.py`
- Modify: `tests/test_debug_runtime.py`
- Modify: `tests/test_event_agent.py`

## Plan

### Plan

1. Add or update tests so realistic ChatAgent fixtures emit `text_event` and EventAgent provider fixtures emit `provider_tool_call`.
2. Verify tests fail because Runtime/EventAgent still consume only `event`.
3. Change only the two legacy consumer checks to the correct typed kinds.
4. Run focused and full regressions to prove no legacy path was silently lost.

### Act

- Update the minimum runtime fixture that drives text-event handoff to use `StreamItem.text_event(...)`.
- Update EventAgent LLM argument fixtures to use `StreamItem.provider_tool_call(...)`.
- Add explicit assertions that Runtime enqueues/executes the text event and EventAgent executes provider arguments without falling back.
- Run the focused tests and confirm expected RED failures before production changes.
- Update Runtime and EventAgent kind checks.
- Re-run focused and full tests.

### Observe

Confirm that:

- Runtime receives a real typed text event and still emits `chat_event_detected` plus tool execution.
- EventAgent receives a real provider tool call and returns its arguments.
- No direct ChatAgent tool transcript behavior appears in this fix.
- The compatibility constructor is not used to hide production-path type mismatches in the updated tests.

### Update

- Mark 43 and 43.1 `done` only after spec and quality reviews pass.
- Commit this repair separately with the regression and compatibility risk in the message.

## Verification

- `uv run pytest tests/test_debug_runtime.py tests/test_event_agent.py tests/test_openai_stream_parser.py -q`
- `uv run pytest`
- `git diff --check`