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second-opinion
second-opinion is an open-source productivity skill for Codex and Gemini CLI, published by trailofbits. Its author describes it as: “Runs external LLM code reviews (OpenAI Codex or Google Gemini CLI) on uncommitted changes, branch diffs, or specific commits. Use when the user asks for a second opinion, external review, codex review, gemini review,…”. The project has 6.6k stars on GitHub and is available under the CC-BY-SA-4.0 license. Add it to your setup with `/plugin marketplace add trailofbits/skills`.
What second-opinion does
Shell out to external LLM CLIs for an independent code review powered by a separate model. Supports OpenAI Codex CLI and Google Gemini CLI.
Installation
Add second-opinion to your agent with:
/plugin marketplace add trailofbits/skillsAlways review a skill's source before installing it. This command comes from the skill's public repository; the linked repo is the source of truth for exact setup steps.
What's inside
The SKILL.md for second-opinion is organised into these sections:
- When to Use
- When NOT to Use
- Safety Note
- Quick Reference
- Invocation
- 1. Gather context interactively
- 2. Run the tool directly
- Diff Preview
- Skipping Inapplicable Checks
- Dependency Scanning
- Auto-detect Default Branch
- Codex Invocation
When to use it
Reach for second-opinion when you want productivity help from Codex without writing the same instructions every session. Load the skill and the agent picks it up automatically for relevant tasks.
Strengths
- Clear CC-BY-SA-4.0 license — safe to read and adapt
- Ships in trailofbits/skills, an established project with 6,646 GitHub stars
- Declares compatibility with Codex, Gemini CLI
- Actively maintained (recent commits)
Topics
Frequently asked questions
- What does second-opinion do?
- Runs external LLM code reviews (OpenAI Codex or Google Gemini CLI) on uncommitted changes, branch diffs, or specific commits. Use when the user asks for a second opinion, external review, codex review, gemini review, or mentions /second-opinion.
- How do I install second-opinion?
- Run /plugin marketplace add trailofbits/skills in your agent, then reload your skills. Review the source at https://github.com/trailofbits/skills before installing.
- Is second-opinion free to use?
- Yes. second-opinion is free and open source under the CC-BY-SA-4.0 license, so you can read, run, and adapt it within that license's terms.
- Which agents does second-opinion work with?
- second-opinion declares compatibility with Codex and Gemini CLI. Agent Skills use a portable SKILL.md format, so other compatible clients can usually load it too.
- Where does second-opinion come from?
- second-opinion ships inside trailofbits/skills, a repository that contains 41 catalogued skills in total. The repository's 6,646 GitHub stars apply to that whole collection, not to this skill on its own.
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