Diff Review

Diff Review via Google Antigravity (agy)

Have Google's Antigravity CLI review git changes for a second perspective on code quality. agy runs Google's Gemini models and replaces the deprecated gemini-cli.

Quick Start

Save the diff into the workspace (Google Antigravity can't read paths outside it), have it review, then clean up:

git diff --cached > agy-review.diff
agy --print "Review the code changes in agy-review.diff for issues. Do not make any changes. Respond with feedback only." --dangerously-skip-permissions
rm agy-review.diff

Google Antigravity has no --allowed-tools flag — restrict it via the "Do not make any changes" clause in the prompt. agy can still read other files in the workspace when it needs broader context.

Patterns

Staged changes:

git diff --cached > agy-review.diff
agy --print "Review agy-review.diff for:
1. Bugs or logic errors
2. Security vulnerabilities
3. Style inconsistencies
4. Missing error handling
Do not make any changes. Respond with feedback only." --dangerously-skip-permissions
rm agy-review.diff

All uncommitted changes:

git diff HEAD > agy-review.diff
agy --print "Review agy-review.diff. Do not make any changes. Respond with feedback only." --dangerously-skip-permissions
rm agy-review.diff

Specific commit:

git show abc123 > agy-review.diff
agy --print "Review the commit captured in agy-review.diff. Do not make any changes. Respond with feedback only." --dangerously-skip-permissions
rm agy-review.diff

Focused Reviews

Security focus:

git diff --cached > agy-review.diff
agy --print "Security review of agy-review.diff. Check for:
- XSS vulnerabilities
- SQL/command injection
- Sensitive data exposure
- Authentication/authorization issues
Do not make any changes. Respond with feedback only." --dangerously-skip-permissions
rm agy-review.diff

Performance focus:

git diff --cached > agy-review.diff
agy --print "Performance review of agy-review.diff. Check for:
- Inefficient algorithms
- N+1 queries
- Memory leaks
- Blocking operations
Do not make any changes. Respond with feedback only." --dangerously-skip-permissions
rm agy-review.diff

With File Context

Ask agy to read full files for broader context (the prompt-level read-only clause still applies):

git diff --cached > agy-review.diff
agy --print "Review agy-review.diff. Also read the full files:
- src/auth/login.ts
- src/utils/validate.ts
to understand the broader context. Do not make any changes. Respond with feedback only." --dangerously-skip-permissions
rm agy-review.diff

Multi-turn Review

Use --continue to drill into agy's findings:

git diff --cached > agy-review.diff
agy --print "Review agy-review.diff for security issues. Do not make any changes. Respond with feedback only." --dangerously-skip-permissions

agy --continue --print "Of those findings, which are most likely exploitable in production? Do not make any changes. Respond with feedback only." --dangerously-skip-permissions
rm agy-review.diff

Notes

• Google Antigravity must not make any changes; provide feedback ONLY. Without the prompt clause, agy may attempt edits.
• agy reads files inside the current workspace only. Saving the diff into the project root (agy-review.diff) makes it accessible.
• agy respects .gitignore — it cannot read files matching gitignore patterns.
• Requires dangerouslyDisableSandbox: true on the Bash tool because Google Antigravity writes session state under ~/.gemini/ (shared with the old gemini-cli).
• May take 1–2 minutes for thorough review; bump --print-timeout if needed (use a unit, e.g. --print-timeout 10m).
• See references/setup.md and references/patterns.md for more.