Developer Fixes AI Commit Message Attribution Bug With a Simple Post-Processing Filter

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A developer building a Claude-powered Git commit message generator discovered the AI was appending unwanted 'Co-Authored-By' attribution lines to commits despite explicit prompt instructions to omit them. Prompt-based fixes — including bolded 'NEVER' directives — reduced the behaviour but could not eliminate it entirely, since large language model outputs are probabilistic rather than deterministic. The developer reframed the problem after reading that a reliable quality gate requires deterministic filtering, not better-worded prompts. A short post-processing script was added to strip any output line containing attribution-related keywords like 'claude', 'co-authored', or 'ai' before the message reaches Git. The same filter was applied to an MCP server wrapping the same tool, ensuring consistent output across all code paths.

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