second-opinion

second-opinion

A Claude Code plugin that teaches Claude to consult other AI coding CLIs — Gemini, OpenAI Codex, Grok, Aider, Warp, and vibe-tools — to get an independent second opinion on a question, design, code review, or bug, then synthesize their input with its own.

Cross-checking against independent models catches blind spots, surfaces alternative designs, and builds (or breaks) consensus before you commit to an approach.

What you get

Component	Name	What it does
Slash command	/second-opinion [question]	Probes which AI CLIs are installed, queries them non-interactively, and synthesizes their answers.
Skill	second-opinion	Reference Claude loads automatically when you want cross-model review: exact non-interactive invocations, auth requirements, and install hints for each tool.
Subagent	second-opinion	Delegate target for gathering and reconciling outside opinions in its own context.

Install

From the fingerskier-plugins marketplace:

claude plugin marketplace add fingerskier/claude-plugins
claude plugin install second-opinion@fingerskier-plugins

Usage

/second-opinion is a global mutex the right way to make this cache thread-safe?
/second-opinion review the diff in src/auth.ts for security issues
/second-opinion get Gemini's take on this error: <paste stack trace>

You can also just ask Claude in plain language — "get a second opinion on this from another AI" — and the skill/subagent will kick in.

Supported tools

The plugin detects which tools are installed (command -v) and only uses those, and it verifies flags with each tool's --help before calling, so it stays robust as the tools evolve. Expected non-interactive invocations:

Tool	Headless call	Auth
Gemini CLI	gemini -p "…"	GEMINI_API_KEY
OpenAI Codex CLI	codex exec "…"	codex login / OPENAI_API_KEY
Grok Build (official xAI CLI)	grok -p "…"	browser sign-in / GROK_CODE_XAI_API_KEY
Aider	aider --message "…" --chat-mode ask	provider key
Warp (Oz CLI)	oz agent run --prompt "…"	WARP_API_KEY / Warp login
vibe-tools	vibe-tools ask "…" · vibe-tools repo "…"	provider key(s)

Fallbacks the plugin will also use if present: llm and a local model via ollama.

Note on cost & keys: these tools call third-party APIs and usually need an API key in your environment. If a tool isn't installed or isn't authenticated, the plugin reports it and moves on rather than failing.

Note on Aider: Aider edits files. The plugin uses --chat-mode ask for opinion-only queries; it only lets Aider modify your tree when you explicitly want its proposed implementation as the "opinion".

License

MIT