Anvil MCP by usefulapi
Hosted MCP server for Anvil — fill & generate PDFs and run Etch e-signature packets for AI agents.
Connect it
Settings → Connectors → Add custom connector
URL: https://anvil.usefulapi.io/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://anvil.usefulapi.io/mcp{
"mcpServers": {
"anvil": {
"url": "https://anvil.usefulapi.io/mcp"
}
}
}claude mcp add --transport http anvil https://anvil.usefulapi.io/mcp{
"servers": {
"anvil": {
"type": "http",
"url": "https://anvil.usefulapi.io/mcp"
}
}
}10 tools, verified live
anvil_current_userread-onlyGet 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.
anvil_get_organizationread-onlyFetch 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.
anvil_get_castread-onlyFetch 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.
anvil_get_etch_packetread-onlyFetch 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.
anvil_get_weldread-onlyFetch a weld — an Anvil workflow — by eid, including its forges (the individual form steps: eid, name, slug). GraphQL query: weld.
anvil_get_weld_dataread-onlyFetch a weldData record — a single submission to a weld (workflow) — by eid: completion state, test flag, and creation time. GraphQL query: weldData.
anvil_fill_pdfcan modifyFill 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.
anvil_generate_pdfcan modifyGenerate 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 }.
anvil_create_etch_packetcan modifyCreate 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.
anvil_generate_etch_sign_urlcan modifyGenerate a one-time embedded signing URL for a specific signer in an Etch packet (for iframe/redirect signing flows). GraphQL mutation: generateEtchSignURL. Returns { url }.
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