Second Opinion MCP MCP server

An adversarial verification service for AI agents that employs an independent skeptic model to challenge factual claims before irreversible actions. It provides structured verdicts with citations and on-chain audit receipts via HTTP 402 payments, helping agents avoid errors in code, research, and promises.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by Second Opinion

MCP endpoint (Streamable HTTP)

https://secondopinionx402.com/mcp

Vendor documentation

What you can do with it

Verify factual claims before code ships
Check research statistics before publication
Validate warranty policies before customer promises
Spot-check deliverables before paying other agents

Tools advertised by the last live check:

second_opinion_quick
second_opinion_verify
second_opinion_panel
second_opinion_try
second_opinion_result
second_opinion_pricing

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http second-opinion-mcp https://secondopinionx402.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add second-opinion-mcp --url https://secondopinionx402.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable second-opinion-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "second-opinion-mcp": {
      "url": "https://secondopinionx402.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "second-opinion-mcp": {
      "type": "streamableHttp",
      "url": "https://secondopinionx402.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start second-opinion-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "second-opinion-mcp": {
      "type": "http",
      "url": "https://secondopinionx402.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http second-opinion-mcp https://secondopinionx402.com/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "second-opinion-mcp": {
      "url": "https://secondopinionx402.com/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "second-opinion-mcp": {
      "serverUrl": "https://secondopinionx402.com/mcp"
    }
  }
}

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