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AI tool fails to standardize error handling across separate fixes

The author discovered a bug in their `generate_commit_message` tool, which uses Claude to create commit messages from git diffs. The tool has two distinct failure paths: one returns an "ERROR: empty diff" message, while another, added later, returns a "claude -p timed out" message. This inconsistency means that callers who check for the "ERROR:" prefix to avoid using invalid messages will incorrectly accept the timeout message as a valid commit. The author attributes this sequencing bug to separate fixes made on different days without cross-referencing existing failure conventions. The fix involves adding the "ERROR:" prefix to the timeout message. AI

IMPACT This highlights the importance of consistent error handling in AI-powered tools to prevent downstream issues.

RANK_REASON The item describes a bug fix in a specific software tool, not a major industry release or event.

Read on dev.to — MCP tag →

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AI tool fails to standardize error handling across separate fixes

COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · Enjoy Kumawat ·

    I Gave My MCP Tool an ERROR: Convention. I Only Taught It to One of Its Two Failure Paths.

    <p>Two days ago I found and fixed a real gap in <code>generate_commit_message</code>, the MCP tool in <code>server.py</code> that turns a git diff into a Conventional Commit message via <code>claude -p</code>. Called with an empty diff, it used to hand the whole empty string stra…