stable

Stable

Cursor plugin that connects agents to Stable through Stable's hosted Model Context Protocol server.

Find mail in a Stable mailbox, read scanned mail documents, and look up or call Stable API endpoints.

Install

1. Open Cursor Settings → Plugins.
2. Search for Stable.
3. Click Install, then set your Stable API key (below).

Or run /add-plugin stable in chat.

MCP

{
  "mcpServers": {
    "stable": {
      "type": "http",
      "url": "https://mcp.usestable.com/mcp",
      "headers": {
        "x-api-key": "${STABLE_API_KEY}"
      }
    }
  }
}

Auth is a Stable API key sent in an x-api-key header. Create one in the Stable dashboard at https://dashboard.usestable.com/settings/api-keys, then set it in Dashboard → Plugins → Configure. Do not commit the key.

Stable's official API client documents the same header: "Your Stable API key. Passed as the x-api-key header on every request." See https://docs.usestable.com/reference/authentication.

Before you connect

You need a Stable account and an API key. Tool calls run with the permissions attached to that key.

What agents can do

Tool	Capabilities
find-mail	Find mail in the Stable mailbox
read-mail-document	Read a scanned mail document
list-endpoints	List Stable API endpoints available to the key
get-endpoint	Get one Stable API endpoint
search-endpoints	Search Stable API endpoints
execute-request	Run a request against a Stable API endpoint

The hosted runtime is the source of truth for tool names and schemas.

Notes

• This plugin sends the API key as x-api-key on Streamable HTTP requests to https://mcp.usestable.com/mcp. That is the header Stable's public API client documents for https://api.usestable.com.
• Do not commit STABLE_API_KEY.

Docs

• Stable: https://usestable.com
• API reference: https://docs.usestable.com
• Authentication: https://docs.usestable.com/reference/authentication
• API keys: https://dashboard.usestable.com/settings/api-keys
• Server URL: https://mcp.usestable.com/mcp

Logo is Stable's mark from the useStable GitHub organization. The usestable.com site was not reachable when this plugin was added, so the file was not downloaded from the website.

License

MIT