Anvil MCP by usefulapi

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Hosted MCP server for Anvil — fill & generate PDFs and run Etch e-signature packets for AI agents.

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Copy this into your MCP client config:

{
  "mcpServers": {
    "Anvil MCP by usefulapi": {
      "url": "https://anvil.usefulapi.io/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (10)

• anvil_current_user read-only

  Get the authenticated Anvil user (from the API key) and the organizations they belong to (eid, name, slug). Good first call to discover org slugs/eids for other tools. GraphQL query: currentUser.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• anvil_get_organization read-only

  Fetch an Anvil organization and its PDF templates (casts) and workflows (welds). Provide either its slug or its eid (at least one is required). GraphQL query: organization.

  Parameters:

  • eid — string — Organization eid. Provide this OR slug.
  • slug — string — Organization slug (from anvil_current_user). Provide this OR eid.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• anvil_get_cast read-only

  Fetch a cast — an Anvil PDF template — by its eid: title, version number, and whether it is a template. Use the returned eid as the cast_eid for anvil_fill_pdf. GraphQL query: cast.

  Parameters:

  • eid (required) — string — The cast (PDF template) eid.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• anvil_get_etch_packet read-only

  Fetch an Etch e-signature packet by eid: its status, details URL, document group, and every signer (eid, aliasId, name, email, status, routing order). Use this to check signature progress. GraphQL query: etchPacket.

  Parameters:

  • eid (required) — string — The Etch packet eid (returned by anvil_create_etch_packet).

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• anvil_get_weld read-only

  Fetch a weld — an Anvil workflow — by eid, including its forges (the individual form steps: eid, name, slug). GraphQL query: weld.

  Parameters:

  • eid (required) — string — The weld (workflow) eid.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• anvil_get_weld_data read-only

  Fetch a weldData record — a single submission to a weld (workflow) — by eid: completion state, test flag, and creation time. GraphQL query: weldData.

  Parameters:

  • eid (required) — string — The weldData (workflow submission) eid.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• anvil_fill_pdf destructive

  Fill an Anvil PDF template (cast) with data and return the finished PDF as base64. REST: POST /fill/{castEid}.pdf. Returns { filename, byteLength, pdfBase64 }. The `data` object's keys are the template's field aliases.

  Parameters:

  • cast_eid (required) — string — The cast (PDF template) eid to fill (from anvil_get_cast).
  • data (required) — object — Object mapping the template's field aliases to values, e.g. { "name": "Sam", "date": "2026-07-16" }.
  • title — string — Optional title embedded in the generated PDF metadata.
  • fontSize — number — Optional default font size for filled text.
  • textColor — string — Optional default text color as a hex string, e.g. #333333.

  Hints: read-only not declared · destructive yes · idempotent not declared · open-world not declared

• anvil_generate_pdf destructive

  Generate a brand-new PDF from HTML or Markdown and return it as base64. REST: POST /generate-pdf. For type=html, pass data = { html, css? }. For type=markdown, pass data = [ { label, content }, ... ]. Returns { filename, byteLength, pdfBase64 }.

  Parameters:

  • data (required) — For html: { html: "<h1>Hi</h1>", css?: "..." }. For markdown: [ { label: "Section", content: "# Title\n..." }, ... ].
  • type — string — Source format. Default html.
  • title — string — Optional title embedded in the generated PDF metadata.

  Hints: read-only not declared · destructive yes · idempotent not declared · open-world not declared

• anvil_create_etch_packet destructive

  Create an Etch e-signature packet (documents + signers). GraphQL mutation: createEtchPacket. IMPORTANT: isDraft defaults to true (a safe draft that sends nothing). Setting isDraft=false with real signers SENDS signature-request emails to those signers. Use isTest=true while developing.

  Parameters:

  • name (required) — string — Human-readable name for the packet.
  • data — object — Optional payload data used to pre-fill the packet's documents.
  • files — array — Array of file/document objects (casts or uploads) to include. Passed straight through to Anvil.
  • isTest — boolean — Set true to create a test packet (no legal weight, no charge).
  • isDraft — boolean — Default true. When true, creates a draft and sends nothing. Set false to activate and email signers.
  • signers — array — Array of signer objects, e.g. [{ id, name, email, signerType, routingOrder, fields }]. Passed straight through to Anvil.
  • signatureEmailBody — string — Optional body text for the signature-request email.
  • signatureEmailSubject — string — Optional subject line for the signature-request email.

  Hints: read-only not declared · destructive yes · idempotent not declared · open-world not declared

• anvil_generate_etch_sign_url destructive

  Generate a one-time embedded signing URL for a specific signer in an Etch packet (for iframe/redirect signing flows). GraphQL mutation: generateEtchSignURL. Returns { url }.

  Parameters:

  • signer_eid (required) — string — The signer eid (from the packet's documentGroup.signers).
  • client_user_id (required) — string — Your app's stable id for the signing user (ties the session to your user).

  Hints: read-only not declared · destructive yes · idempotent not declared · open-world not declared

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