Send a letter from Junie.

Add paperplane to Junie’s mcp.json and it can quote and send a real USPS letter — no account required, free sandbox mode included.

Free to preview — see the exact PDF before you pay. Sending starts at $1.99, no account required.

Set it up in Junie

Step 1

Add to .junie/mcp/mcp.json

A separate JetBrains product from AI Assistant, with its own config path.

{
  "mcpServers": {
    "paperplane": { "url": "https://sendpaperplane.com/api/mcp" }
  }
}

Try it: free, nothing mailed

Tell your agent:

Using the paperplane tools, quote a 1-page certified letter to Property LLC, 1 Main St, Richmond VA 23220, then send it in sandbox mode.

Not on Junie? Any surface works.

The same three calls from the CLI, any MCP client or plain REST. Sandbox is free and mails nothing.

Send a letter

{
  "mcpServers": {
    "paperplane": { "url": "https://sendpaperplane.com/api/mcp" }
  }
}

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Common questions

Is Junie the same as JetBrains AI Assistant?

No — Junie is a separate JetBrains product with its own config path, .junie/mcp/mcp.json (project) or ~/.junie/mcp.json (global), easy to conflate with AI Assistant’s own MCP settings.

What tools does Junie get?

quote_letter, send_letter, and get_letter_status for mailing, plus buy_credits for pre-funding sends. Postcards are live (from $1.99) via the REST API’s format field, though not yet an MCP tool argument.

How much does sending cost?

Letters start at $1.99 for First-Class; Certified Mail starts at $12.99. Sandbox mode is free.