Formfeed MCP server

@formfeed/mcp

Model Context Protocol server for Formfeed. Gives Claude, Cursor and other agents twelve tools: list_templates, get_template_schema, validate_template (free: the data against the template's schema, ad-hoc HTML offline), check_invoice (free and offline: the _invoice block of a ZUGFeRD / Factur-X e-invoice against EN 16931), render (with einvoice, the PDF becomes that e-invoice; an image comes back as a picture the agent can look at), validate_einvoice (which rules an e-invoice XML passed, by which validator: a render's stored report for free, or an XML Formfeed did not make, counted per day), markdown_to_pdf (a Markdown document to PDF on every plan; over stdio a file with the pictures beside it), convert_to_pdf (Word, Excel, PowerPoint and OpenDocument to PDF), get_render, get_workspace (which workspace the server works in, and the units left), get_template_source and save_template (a new template or a change as a draft, which a person publishes in Formfeed; needs template:write on the key, or the person's permission for a signed-in agent).

stdio (Claude Desktop, Cursor, Claude Code)

{
  "mcpServers": {
    "formfeed": {
      "command": "npx",
      "args": ["-y", "@formfeed/mcp"],
      "env": { "FORMFEED_API_KEY": "ff_test_…" }
    }
  }
}

A test key renders for free (on the Free plan with a test mark); a live key consumes units. Without FORMFEED_API_KEY the server starts too, with the offline checks only: validate_template with html and engine, and check_invoice. FORMFEED_REGION=us or FORMFEED_BASE_URL select another API host.

Hosted (Streamable HTTP)

https://mcp.formfeed.dev/mcp takes Authorization: Bearer ff_…, or signs in with your Formfeed account when no key is sent (OAuth; the client opens the browser, and you choose the workspace the agent works in). https://mcp.formfeed.dev/mcp/<workspace id> pins another workspace for a signed-in client. Self-host the same endpoint with formfeed-mcp --http --port 8790, plus --auth-server <issuer> for OAuth sign-in against your own Supabase Auth.

Claude Code installs the hosted server together with two skills for writing and checking templates as Formfeed's plugin, from formfeed-dev/skills: https://docs.formfeed.dev/devkit/coding-agents

Documentation: https://docs.formfeed.dev/integrations/mcp