Agents must never produce Signed-off-by trailers

[guyoron1]

What happens

Code and fix agents sometimes include Signed-off-by trailers in their commits (via git commit -s). This causes gitlint failures in repos with body-max-line-length=72 because the bot noreply email makes the trailer ~90 characters.

What should happen

Agents should never produce Signed-off-by trailers. DCO is a human attestation — agents are not people. The DCO app already waives the check when it recognizes the commit author as a bot.

Two changes needed

1. Skill instructions: Add explicit instruction to code and fix agent skills to never use git commit -s or append Signed-off-by trailers
2. Post-script linter: Add a check in post-code and post-fix scripts that fails if any agent commit contains a Signed-off-by trailer

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Mirrored from fullsend-ai#2236

[guyoron1]

/fs-triage

[fullsend-ai-coder]

🤖 Finished Code · ✅ Success · Started 3:31 PM UTC · Completed 3:34 PM UTC
Commit: bb5c185 · View workflow run →

[fullsend-ai-triage]

🤖 Finished Triage · ✅ Success · Started 3:37 PM UTC · Completed 3:39 PM UTC
Commit: bb5c185 · View workflow run →

[fullsend-ai-triage]

Triage Summary

Severity: Medium · Category: Bug

Agents sometimes produce Signed-off-by trailers via git commit -s, causing gitlint failures in repos with body-max-line-length=72 (the bot noreply email pushes the trailer to ~90 characters). DCO is a human attestation — agents should never sign off, and the DCO app already waives the check for bot authors.

AGENTS.md already documents this rule ("Autonomous agent commits are exempt and must never supply the DCO"), but enforcement is missing in two places:

1. Skill instructions — Code and fix agent skills need explicit instructions to never use git commit -s or append Signed-off-by trailers
2. Post-script guardrail — Post-code and post-fix scripts should check agent commits for Signed-off-by trailers and fail if any are found

Proposed Test Case

Post-script linter test:
- Given a commit with a Signed-off-by trailer → check exits non-zero
- Given a commit without Signed-off-by trailers → check passes

Skill instruction test:
- Verify code and fix agent skill files contain explicit prohibition
  of git commit -s and Signed-off-by trailers

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Labels: This is a confirmed defect in agent behavior involving the dispatch post-scripts, with medium priority since it blocks PRs only in repos with strict gitlint rules.

[guyoron1]

/fs-code

[fullsend-ai-coder]

🤖 Finished Code · ✅ Success · Started 4:08 PM UTC · Completed 4:11 PM UTC
Commit: bb5c185 · View workflow run →