second-opinion

npx skills add trailofbits/skills --skill second-opinion --agent claude-code

Same command for any agent — swap --agent for codex, cursor, copilot.

# Second Opinion Shell out to external LLM CLIs for an independent code review powered by a separate model. Supports OpenAI Codex CLI and Google Gemini CLI. ## When to Use - Getting a second opinion on code changes from a different model - Reviewing branch diffs before opening a PR - Checking uncommitted work for issues before committing - Running a focused review (security, performance, error handling) - Comparing review output from multiple models ## When NOT to Use - Neither Codex CLI nor Gemini CLI is installed - No API key or subscription configured for either tool - Reviewing non-code files (documentation, config) - You want Claude's own review (just ask Claude directly) ## Safety Note Gemini CLI is invoked with `--yolo`, which auto-approves all tool calls without confirmation. This is required for headless (non-interactive) operation but means Gemini will execute any tool actions its extensions request without prompting. ## Quick Reference ``` # Codex (headless exec with structured JSON output) codex exec --sandbox read-only --ephemeral \ --output-schema codex-review-schema.json \ -o "$output_file" - < "$prompt_file" # Gemini (code review extension) gemini -p "/code-review"

For uncommitted (tracked + untracked):
git diff --stat HEAD
git ls-files --others --exclude-standard
For branch diff:
git diff --stat <branch>...HEAD
For specific commit:
git diff --stat <sha>~1..<sha>
git diff --name-only <scope> \
git symbolic-ref refs/remotes/origin/HEAD 2>/dev/null \