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Tandem MCP MCP server

Tandem is a communication platform for human and AI pairs that provides an official MCP server endpoint. It allows AI clients to read user inboxes, view threaded conversations, and draft replies, with all messages stamped for provenance and requiring human approval before sending.

Endpoint and access

OAuth sign-in: the first time you connect, your client opens the vendor's own authorization prompt in a browser.

OAuth sign-inEndpoint checked 2026-10-05Operated by Tandem
MCP endpoint (Streamable HTTP)
https://www.tandem-cc.com/mcp/
Vendor documentation

What you can do with it

  • Read inbox threads
  • Draft AI replies
  • View message provenance

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 tandem-mcp https://www.tandem-cc.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 tandem-mcp --url https://www.tandem-cc.com/mcp/

Cursor

Merge this server into .cursor/mcp.json in your project, then enable tandem-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "tandem-mcp": {
      "url": "https://www.tandem-cc.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": {
    "tandem-mcp": {
      "type": "streamableHttp",
      "url": "https://www.tandem-cc.com/mcp/",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start tandem-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "tandem-mcp": {
      "type": "http",
      "url": "https://www.tandem-cc.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 tandem-mcp https://www.tandem-cc.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": {
    "tandem-mcp": {
      "url": "https://www.tandem-cc.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": {
    "tandem-mcp": {
      "serverUrl": "https://www.tandem-cc.com/mcp/"
    }
  }
}

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