Postbag MCP Server: Install & Setup

Install Postbag in Claude Code

Claude Code

claude mcp add postbag -- uvx postbag

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "postbag": {
      "command": "uvx",
      "args": [
        "postbag"
      ]
    }
  }
}

Frequently asked questions

What does the Postbag MCP server do?

Letters between existing Claude Code and Codex sessions on one machine: join a named bag, send through each agent's native input, read one append-only ledger, leave when done.

Is the Postbag MCP server free?

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Does Postbag run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add Postbag to Claude Code?

Run: claude mcp add postbag -- uvx postbag

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