# Todo 49.2 Session Load Race and Visible Repair Plan

**Status:** done

## Goal

Close reviewed session restoration races without changing the completed Todo 49/49.1 records.

## Scope

- Guard asynchronous session replay with a monotonically increasing load token and the selected session id so stale responses cannot overwrite current UI state.
- Ignore stale success and failure status updates from superseded loads.
- Treat whitespace-only assistant content with `tool_calls` as protocol-only in replay.
- When repairing an incomplete persisted tool-call group, retain non-blank assistant content as a provider-valid assistant message without `tool_calls`; continue dropping orphan tool replies.

## Files

- Modify: `src/agent_lab/application/runtime.py`
- Modify: `src/agent_lab/presentation/static/app.js`
- Modify: `tests/test_debug_runtime.py`
- Modify: `tests/test_websocket_api.py`

## Requirement Execution Loop

### Plan

1. Add RED tests for out-of-order session replay, whitespace-only protocol messages, and incomplete tool rounds with visible text.
2. Add the smallest load-token and transcript-repair changes.
3. Run focused tests, JS syntax, full tests, diff check, and bounded review.

## Verification

- `uv run pytest tests/test_debug_runtime.py tests/test_websocket_api.py -q`
- `node --check src/agent_lab/presentation/static/app.js`
- `uv run pytest`
- `git diff --check`

## Observe / Update

- Superseded replay success/failure responses cannot mutate the selected session UI.
- Whitespace-only protocol assistant records are hidden, while incomplete protocol records with visible text are restored without `tool_calls`.
- Focused tests passed (`132 passed`); full suite passed (`387 passed`) before the directional token follow-up.