MCP

The MCP server is a thin wrapper over the /v1 API: one tool per endpoint, the same auth and limits. Anything you can do with the API, an agent can do through MCP — look up organizations, pull filings, compare compensation, search semantically.

Connect

https://www.northstartoolkit.com
/api/mcp

Works keyless. Step-by-step setup for Claude.ai, Claude Desktop, Claude Code, Cursor, and ChatGPT is on the Connect page.

Design notes for agent builders

• Tools return the API's flat JSON — no prose wrapping, so models can chain calls reliably.
• Rate-limit errors (429) name the tier and the upgrade path in the message body, so agents can surface the fix verbatim.
• Every filing-derived record carries tax_year, form_type, and a source block — cite them; the IRS publishes filings with a lag.