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claude-code - 💡(How to fix) Fix [Feature Request] Sub-agent verification: cross-check bot verdicts before accepting [1 comments, 1 participants]

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anthropics/claude-code#46236•Fetched 2026-04-11 06:25:33
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Claude accepts or rejects automated review verdicts (Copilot, Codex, DeepSeek, Cursor Bugbot) without independent verification.

Two failure modes observed:

1. Blind acceptance of BLOCK verdict (2026-04-10): DeepSeek-R1 issued BLOCK on a PR claiming evidence level was overclaimed. Claude immediately downgraded the classification without checking if analogous code in the same repo used the same classification. Cross-check later revealed the existing spend_gate_bridge uses the identical pattern and IS classified at the challenged level. DeepSeek was wrong. Revert required an extra commit.

2. Blind acceptance of 'all clean' (Anthropic #45731): Sub-agents hallucinated a non-existent CRITICAL bug while missing real fail-open bypasses in the same files.

Root Cause

Bot reviewers are useful but imperfect. Treating their output as ground truth in either direction (BLOCK or PASS) leads to unnecessary churn or missed bugs. Claude should be a critical consumer of review output, not a relay.

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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single report
  • I am using the latest version of Claude Code

Summary

Claude accepts or rejects automated review verdicts (Copilot, Codex, DeepSeek, Cursor Bugbot) without independent verification.

Two failure modes observed:

1. Blind acceptance of BLOCK verdict (2026-04-10): DeepSeek-R1 issued BLOCK on a PR claiming evidence level was overclaimed. Claude immediately downgraded the classification without checking if analogous code in the same repo used the same classification. Cross-check later revealed the existing spend_gate_bridge uses the identical pattern and IS classified at the challenged level. DeepSeek was wrong. Revert required an extra commit.

2. Blind acceptance of 'all clean' (Anthropic #45731): Sub-agents hallucinated a non-existent CRITICAL bug while missing real fail-open bypasses in the same files.

Proposed Solution

When a bot reviewer issues BLOCK or CRITICAL:

  1. Verify the claim exists at the cited file:line via git show
  2. Search for analogous patterns in the codebase — is the finding consistent with existing classifications?
  3. If the finding contradicts established precedent → respond with evidence, do not comply

When a bot says 'all clean':

  1. Pick at least 1 file from the diff
  2. Read it independently
  3. If anything found → signal to review all files

Why This Matters

Bot reviewers are useful but imperfect. Treating their output as ground truth in either direction (BLOCK or PASS) leads to unnecessary churn or missed bugs. Claude should be a critical consumer of review output, not a relay.

Environment

  • Claude Code CLI (latest)
  • Model: Claude Opus (Max plan)
  • macOS

extent analysis

TL;DR

Implement a verification step for automated review verdicts to ensure Claude does not blindly accept or reject decisions without independent validation.

Guidance

  • When a bot reviewer issues a BLOCK or CRITICAL verdict, verify the claim by checking the cited file and line via git show and searching for analogous patterns in the codebase.
  • For 'all clean' verdicts, manually review at least one file from the diff to ensure no issues are missed.
  • If a finding contradicts established precedent, respond with evidence rather than complying with the bot's decision.
  • Consider implementing a process to track and review instances where Claude's decisions are overridden to improve the model's performance over time.

Example

# Verify a claim using git show
git show <commit_hash> -- <file_path>

This command can be used to verify the claim made by a bot reviewer by checking the contents of the file at the specified commit hash.

Notes

The proposed solution relies on the ability to access the codebase and commit history, which may not be possible in all environments. Additionally, the effectiveness of this solution depends on the quality of the verification process and the ability to identify analogous patterns in the codebase.

Recommendation

Apply the proposed workaround to implement a verification step for automated review verdicts, as this will help ensure that Claude is a critical consumer of review output and reduces the risk of unnecessary churn or missed bugs.

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