OfficialLocal + RemoteFree server, account needed

One MCP server

withoneai/mcp

Search, document and execute authenticated API calls across apps such as Gmail, Slack, Stripe, Notion and GitHub through a few tools with constant context size.

12 GitHub stars4 forks
Source code Website

Install One in Claude Code

Remote URL

Claude Code
claude mcp add --transport http one https://mcp.withone.ai/mcp
mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)
{
  "mcpServers": {
    "one": {
      "url": "https://mcp.withone.ai/mcp"
    }
  }
}

npm

Claude Code
claude mcp add one -e ONE_SECRET=... -- npx -y @withone/mcp
mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)
{
  "mcpServers": {
    "one": {
      "command": "npx",
      "args": [
        "-y",
        "@withone/mcp"
      ],
      "env": {
        "ONE_SECRET": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the One MCP server do?

Search, document and execute authenticated API calls across apps such as Gmail, Slack, Stripe, Notion and GitHub through a few tools with constant context size.

Is the One MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does One run locally or remotely?

Local + Remote. Can run locally or be used as a hosted remote server.

How do I add One to Claude Code?

Run: claude mcp add --transport http one https://mcp.withone.ai/mcp

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