Name: Autumn MCP Server
Author: SirTenzin

LABSCO SUMMARY

Ships the API spec alongside the tools, so the model reads the schema instead of inferring it.

Exposing OpenAPI.json as a resource is the part that changes behaviour: response fields come from the specification rather than from the model's memory of what a billing API usually returns. Worth knowing before you wire it into anything customer-facing — this is an unofficial project, and the key you paste in is a live billing credential.

What it is

An unofficial server for Autumn's pricing API. Alongside the tools it exposes Autumn's OpenAPI specification as a resource, so the model can read the request and response shapes rather than guessing them, plus a prompt aimed at AI app builders such as Lovable, Bolt.new and v0.

What you get

Create a customer, and fetch an existing one by id
Read a customer's entitlements — what their plan actually allows
Manage their invoices
Generate a billing portal link to hand to that customer
The bundled OpenAPI.json covers /attach, /entitled, /events, /customers, /customers/:id and /customers/:id/billing_portal

Requirements

An Autumn API key, passed as --apiKey on the launch command. Bun is the runtime: clone the repository, bun install, then point your client at bun run <YOUR_ABSOLUTE_PATH_TO_INDEX_TS>. Either the public or the secret key works, but some features are unavailable with the public key.

Setup effort

Build from source — git clone https://github.com/SirTenzin/autumn-mcp-server

See installation options

USE CASES

01

Checking what a customer is entitled to

Look up the customer and read their entitlements instead of cross-referencing the plan table.

02

Getting someone into their billing portal

Generate the portal link for that customer and send it on.

03

Answering an invoice question

Pull the customer's invoices during the conversation rather than after it.

04

Building against the Autumn API

Have the model read the bundled OpenAPI specification for the endpoint shapes before it writes the integration.

BEFORE YOU INSTALL

What to know first

Requires

bun on PATH

Where it runs

The documented client runs the server on your machine.

INSTALLATION

Connect your client

This one is built from source rather than installed with a single command.

Server setup

TERMINAL

git clone https://github.com/SirTenzin/autumn-mcp-server
cd autumn-mcp-server
bun install

MCP Clients

Claude Desktop

CLAUDE DESKTOP · JSON

{
  "mcpServers": {
    "autumn": {
      "command": "bun",
      "args": [
        "run",
        "<YOUR_ABSOLUTE_PATH_TO_INDEX_TS>",
        "--apiKey=<YOUR_API_KEY>"
      ]
    }
  }
}

<YOUR_ABSOLUTE_PATH_TO_INDEX_TS> is the full path to index.ts in your clone, and <YOUR_API_KEY> your Autumn public or secret key (some features need the secret key).

Autumn MCP Server