# Todo 52.8 Benchmark No-Overwrite Publication Plan

**Status:** in_progress

## Goal

Remove the final check-then-replace race from concurrent benchmark report publication.

## Scope

- Fully write and fsync JSON/Markdown temporary files in the destination directory.
- Publish each file using `os.link(temp, final)`, whose destination creation is atomic and fails if the path already exists.
- If either candidate path conflicts, remove only links whose inode matches the current temporary file, choose the next suffix, and retry the pair.
- Remove temporary files after both links succeed; retain no lock or placeholder files.
- Test a competitor creating/replacing destinations immediately before each link call.

## Files

- Modify: `src/agent_lab/infrastructure/benchmark_reporting.py`
- Modify: `tests/test_benchmark_reporting.py`

## Verification

- `uv run pytest tests/test_benchmark_reporting.py -q`
- repeated concurrent/competitor stress tests
- `uv run pytest`
- `git diff --check`