gemini-review-code

Gemini Code Review

Send code changes to Gemini CLI for an independent code review. Gemini runs in plan (read-only) approval mode to ensure no file modifications.

Workflow

Step 1: Determine Review Scope

Parse the user's request to determine what to review:

• Uncommitted changes (default): No specific files mentioned. Use git diff to capture all staged and unstaged changes.
• Staged only: User asks to review staged changes. Use git diff --cached.
• Branch comparison: User mentions a branch (e.g., "review against main"). Use git diff <branch>...HEAD.
• Specific files: User lists file paths. Concatenate the files.

If git diff produces no output, fall back to git diff HEAD~1 to review the last commit.

Step 2: Execute Gemini Review

Use a 5-minute Bash timeout (300000ms) for all commands.

For diff-based review (default):

git diff | gemini --approval-mode plan -o text \
  -p "Review this code diff for:
- Bugs and logic errors
- Security vulnerabilities (injection, overflow, resource leaks)
- Design issues and code smells
- Missing error handling
- Performance concerns

Be specific. Reference file names, line numbers, and function names in your feedback." \
  > /tmp/gemini-code-review.md 2>&1

For branch comparison:

git diff <branch>...HEAD | gemini --approval-mode plan -o text \
  -p "Review this code diff for bugs, security issues, design problems, and improvements. Be specific and reference file names and line numbers." \
  > /tmp/gemini-code-review.md 2>&1

For specific files:

cat <file1> <file2> ... | gemini --approval-mode plan -o text \
  -p "Review this code for bugs, security issues, design problems, and improvements. Be specific and reference line numbers and function names." \
  > /tmp/gemini-code-review.md 2>&1

Step 3: Present Results

Read /tmp/gemini-code-review.md and present the review to the user.

Filter out any Gemini CLI chrome or status lines — present only the model's review content.

Format the output with a clear header:

## Gemini Code Review

<review content>

Clean up the temp file:

rm -f /tmp/gemini-code-review.md

Error Handling

• If gemini is not found: inform the user to install Gemini CLI
• If no changes to review: inform the user that the working tree is clean and no diff is available
• If gemini returns an error: show the error and suggest checking authentication