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validate-changes

Evaluate staged Git changes before committing using an LLM, a language model acting as a reviewer. Receive correctness, completeness, and safety scores, plus issues by severity, to decide whether to fix, commit, or stop.

OriginalShow the original description

Evaluate staged changes using LLM-as-a-Judge before committing

See how to install

Good for

  • Evaluate significant changes before committing
  • Review changes in unfamiliar code
  • Check changes to security-sensitive code
  • Inspect changes before pushing to a shared branch

Files included (1)

  • SKILL.md2.7 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Validate changes before commit

Evaluate staged git changes using the output-evaluator agent to catch issues before committing.

Process

Step 1: Check for staged changes

Run git diff --cached --stat to see what's staged. If nothing is staged, inform the user and exit.

Step 2: Get the full diff

Run git diff --cached to get the complete diff of all staged changes.

Step 3: Invoke the evaluator

Use the Task tool to launch the output-evaluator agent with the diff:

Evaluate these staged changes for correctness, completeness, and safety.
Return a JSON verdict with scores and issues.

Changes:
[paste the git diff here]

Step 4: Parse and act on verdict

Based on the evaluation result:

If APPROVE:

  • Tell the user the changes passed evaluation
  • Show the summary and scores
  • Ask if they want to proceed with commit

If NEEDS_REVIEW:

  • Show all issues found (grouped by severity)
  • Show the suggestion from the evaluator
  • Ask the user how to proceed:
    • Fix issues and re-evaluate
    • Commit anyway (acknowledge risks)
    • Abort

If REJECT:

  • Clearly state the changes were rejected
  • Show critical issues that caused rejection
  • Do NOT offer to commit anyway
  • Suggest specific fixes

Step 5: Commit (if approved)

If user confirms, create the commit using the standard commit flow.

Usage examples

/validate-changes

Output:

Evaluating 3 staged files...

VERDICT: NEEDS_REVIEW

Scores:
  Correctness:  8/10
  Completeness: 6/10
  Safety:       9/10

Issues Found:
  [MEDIUM] src/api/handler.ts:45
    Missing error handling for network failures

  [LOW] src/utils/format.ts:12
    Consider adding input validation

Suggestion: Add try-catch around the fetch call in handler.ts

How would you like to proceed?
  1. Fix issues and re-evaluate
  2. Commit anyway (1 medium issue)
  3. Abort

Cost awareness

This command invokes an LLM evaluation, which uses API tokens:

  • Typical cost: $0.01-0.05 per evaluation (using Haiku)
  • Larger diffs: May cost more due to increased token usage

When to use

  • After significant code changes before committing
  • When working on unfamiliar parts of the codebase
  • For changes that affect security-sensitive code
  • Before pushing to shared branches

When to skip

  • Trivial changes (typos, formatting)
  • Documentation-only changes
  • When you've already manually reviewed thoroughly
  • When iterating quickly on a feature branch

Integration with git hooks

For automatic evaluation on every commit, see pre-commit-evaluator.sh hook. This command is the manual alternative when you want control over when evaluation runs.

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