# Todo 52.5 Benchmark Ledger Event Identity Plan

**Status:** done

## Goal

Prevent independent benchmark ledgers from agreeing on counts while referring to different events, and keep failed-run attempt counts truthful.

## Scope

- Preserve event names from `event_batch_results` and `tool_execution` usage rows in `BenchmarkRunResult`.
- Require detected event names, batch-result event names, and tool-metric event names to equal the case's expected ordered event list.
- Keep normalized status checks paired with the batch event identity.
- Report ChatAgent/fallback attempt counts from timing records; continue checking timing counts against persisted ledger counts when persistence exists.
- For pre-ledger failures, retain timing-derived attempt counts instead of `None`/zero.

## Files

- Modify: `src/agent_lab/application/benchmark.py`
- Modify: `tests/test_benchmark_runner.py`

## Verification

- `uv run pytest tests/test_benchmark_runner.py tests/test_benchmark_config.py -q`
- `uv run pytest`
- `git diff --check`

## Observe / Update

- Detected, batch-result, and tool-metric event names are preserved and independently matched to the expected ordered event list.
- Failed streams retain timing-derived model/fallback attempts and any usage already returned.
- Final Task 2 review approved the implementation; focused tests passed (`115 passed`) and the full suite passed (`520 passed`).