MCP Setup

Add 2ndOpinion as an MCP server to get all 10 tools natively inside your AI assistant.

Claude Code

Run this command in your terminal:

claude mcp add 2ndopinion -- npx -y 2ndopinion-cli mcp

Restart Claude Code after adding. Tools will appear automatically.

Claude Desktop

Open Settings → Developer → Edit Config, then add to claude_desktop_config.json:

{
  "mcpServers": {
    "2ndopinion": {
      "command": "npx",
      "args": ["-y", "2ndopinion-cli", "mcp"],
      "env": {
        "SECONDOPINION_API_KEY": "sk_2op_YOUR_KEY"
      }
    }
  }
}

Fully quit and restart Claude Desktop after saving.

Codex (OpenAI)

The Codex desktop app, CLI, and VS Code extension all share the same config. Set up once and it works everywhere.

Option A: CLI command

codex mcp add 2ndopinion -- npx -y 2ndopinion-cli mcp

Option B: Edit config file

Add to ~/.codex/config.toml (TOML format, not JSON):

[mcp_servers.2ndopinion]
command = "npx"
args = ["-y", "2ndopinion-cli", "mcp"]

[mcp_servers.2ndopinion.env]
SECONDOPINION_API_KEY = "sk_2op_YOUR_KEY"

Option C: Desktop app UI

Open the Codex app → Settings (⌘,) → Integrations & MCP → add a custom server.

VS Code + GitHub Copilot

Requires VS Code 1.99+ and GitHub Copilot. Add to .vscode/mcp.json in your project:

{
  "servers": {
    "2ndopinion": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "2ndopinion-cli", "mcp"],
      "env": {
        "SECONDOPINION_API_KEY": "sk_2op_YOUR_KEY"
      }
    }
  }
}

Switch to Agent mode in Copilot Chat to use MCP tools. The key is servers (not mcpServers).

Cursor

Add to .cursor/mcp.json in your project root:

{
  "mcpServers": {
    "2ndopinion": {
      "command": "npx",
      "args": ["-y", "2ndopinion-cli", "mcp"],
      "env": {
        "SECONDOPINION_API_KEY": "sk_2op_YOUR_KEY"
      }
    }
  }
}

Paste your API key for instant setup, or omit the env block and run 2ndopinion login for JWT auth.

Windsurf

Add to ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "2ndopinion": {
      "command": "npx",
      "args": ["-y", "2ndopinion-cli", "mcp"],
      "env": {
        "SECONDOPINION_API_KEY": "sk_2op_YOUR_KEY"
      }
    }
  }
}

Paste your API key for instant setup, or omit the env block and run 2ndopinion login for JWT auth.

Generic (stdio)

For any other MCP-compatible client, use this JSON config:

{
  "mcpServers": {
    "2ndopinion": {
      "command": "npx",
      "args": ["-y", "2ndopinion-cli", "mcp"],
      "env": {
        "SECONDOPINION_API_KEY": "sk_2op_YOUR_KEY"
      }
    }
  }
}

"command": "npx.cmd"

Authentication

Set your API key as an environment variable so the MCP server can authenticate:

export SECONDOPINION_API_KEY="sk_2op_YOUR_KEY"

Or pass it in the MCP config env block (shown in each example above). Create API keys in the dashboard.

How to Use

Once the MCP server is connected, your AI assistant discovers all 10 tools automatically. No special syntax needed — just ask in plain language. Here are example prompts you can try:

Available Tools

For reference, here are the exact tool names your AI assistant discovers:

• secondopinion_opinionGet a second opinion on a diff
• secondopinion_reviewCode review with accept/review/reject
• secondopinion_askAsk any model a question
• secondopinion_explainExplain changes in plain language
• secondopinion_statusCheck usage and limits
• secondopinion_consensus3-model consensus analysis
• secondopinion_bug_hunt3-model bug hunt
• secondopinion_security_auditOWASP security scan
• secondopinion_generate_testsGenerate test suites
• secondopinion_debateMulti-round AI debate