# Todo 52.3 Benchmark Case and Mode Single Source Plan

**Status:** done

## Goal

Prevent benchmark configuration and the executable case catalog from drifting as new cases or modes are added.

## Scope

- Replace separate `Literal` declarations with `StrEnum` definitions for case IDs and invocation modes.
- Derive exported ordered choice tuples from the enums.
- Type catalog keys and config lists with those enums while preserving JSON string serialization and existing runtime request values.
- Assert every case enum has exactly one catalog entry.

## Files

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

## Verification

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

## Observe / Update

- `BenchmarkMode` and `BenchmarkCaseId` enums now drive config validation, exported choices, catalog keys, request construction, and the 12-run comparison matrix.
- Specification and code-quality reviews approved the result; focused tests passed (`76 passed`) and the full suite passed (`481 passed`).