evidence: claude_code 2.1.270 — re-witness wanted

[github-actions]

claude_code has moved since its evidence was taken:

• pre_tool: evidence taken against 2.1.263 (7 days ago); 2.1.270 is now published.
• post_tool: evidence taken against 2.1.247 (17 days ago); 2.1.270 is now published.
• tool_failure: evidence taken against 2.1.247 (17 days ago); 2.1.270 is now published.
• prompt_submit: evidence taken against 2.1.263 (7 days ago); 2.1.270 is now published.
• session_start: evidence taken against 2.1.247 (17 days ago); 2.1.270 is now published.
• session_end: evidence taken against 2.1.247 (17 days ago); 2.1.270 is now published.
• stop: evidence taken against 2.1.263 (7 days ago); 2.1.270 is now published.
• pre_compact: evidence taken against 2.1.247 (17 days ago); 2.1.270 is now published.
• subagent_start: evidence taken against 2.1.247 (17 days ago); 2.1.270 is now published.
• subagent_stop: evidence taken against 2.1.247 (17 days ago); 2.1.270 is now published.
• instructions_loaded: evidence taken against 2.1.247 (17 days ago); 2.1.270 is now published.
• file_changed: evidence taken against 2.1.247 (17 days ago); 2.1.270 is now published.

Re-witness it

You need claude_code installed and runnable headlessly from a terminal.

pip install agentseam
python3 tools/experiment.py run --agent claude_code --event pre_tool \
    --driver "<your headless CLI invocation, containing {prompt}>" \
    --agent-version 2.1.270 --record --reporter @yourhandle
python3 tools/experiment.py run --agent claude_code --event prompt_submit \
    --driver "<your headless CLI invocation, containing {prompt}>" \
    --agent-version 2.1.270 --record --reporter @yourhandle
python3 tools/experiment.py run --agent claude_code --event stop \
    --driver "<your headless CLI invocation, containing {prompt}>" \
    --agent-version 2.1.270 --record --reporter @yourhandle

This writes data/recordings/claude_code@2.1.270.json and touches nothing else on your machine.

A run against the reference or recorded driver never counts as a re-witness --
only a real, running claude_code does.

Submit it

• Preferred: open a PR adding that recording file plus the updated
  data/matrix.json per-claim test pointers (see any recorded row for the shape).
• Or: open an "Evidence report" issue and paste the recording JSON for a
  maintainer to land.