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fix(acr): pin Bash >> append discipline on shared implementation log (M-BUG-20)

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implement.md spawns implementer agents in parallel batches, all appending to
the same implementation-log.md. Dogfooding showed agents satisfying 'Append
result to:' with a full-file Write — the last writer clobbered 4 of 6 entries.
Pin the mechanism in both contracts: append with Bash >> heredoc, never the
Write/Edit tool on the shared log. Shape tests pin the instruction in both
files (empirically verified: agents given the >> instruction appended safely).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Kjell Tore Guttormsen 2026-07-17 03:53:06 +02:00
commit b4d819b72d
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agents/implementer-agent.md
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@ -146,6 +146,11 @@ Move content from one file to another.
Append to: `~/.claude/config-audit/sessions/{session-id}/implementation-log.md`
**Append discipline (shared log):** other implementer agents may be writing this
log concurrently. ALWAYS append your entry with a Bash `>>` heredoc;
NEVER use the Write or Edit tool on the log file — a full-file Write silently
clobbers entries other agents appended after you read the file.
### Success
```markdown