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Anvil MCP by usefulapi

by usefulapi.io · remote · no sign-in to list tools · v1.16.3 · published by io.usefulapi

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

Deletes · 4
CompareRegistry entry

10 tools: 4 can delete or cancel things and 6 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http anvil https://anvil.usefulapi.io/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

10 tools

Deletes or cancels 4Claude Code: deny
  • anvil_create_etch_packetCreate an Etch e-signature packet (documents + signers).No findings

    Why it is in this group

    • The name "anvil_create_etch_packet" says "create": a word for a change.
    • The server marks it destructive (destructiveHint: true).
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Create Etch e-signature packet
    • destructiveHint: true
  • anvil_fill_pdfFill an Anvil PDF template (cast) with data and return the finished PDF as base64.No findings

    Why it is in this group

    • The name "anvil_fill_pdf" says "fill": a word for a change.
    • The server marks it destructive (destructiveHint: true).
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Fill a PDF template
    • destructiveHint: true
  • anvil_generate_etch_sign_urlGenerate a one-time embedded signing URL for a specific signer in an Etch packet (for iframe/redirect signing flows).No findings

    Why it is in this group

    • The name "anvil_generate_etch_sign_url" says "generate": a word for a change.
    • The server marks it destructive (destructiveHint: true).
    Description, as the server wrote it
    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 }.

    Annotations the server declares

    • title: Generate Etch signing URL
    • destructiveHint: true
  • anvil_generate_pdfGenerate a brand-new PDF from HTML or Markdown and return it as base64.No findings

    Why it is in this group

    • The name "anvil_generate_pdf" says "generate": a word for a change.
    • The server marks it destructive (destructiveHint: true).
    Description, as the server wrote it
    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 }.

    Annotations the server declares

    • title: Generate a PDF from HTML or Markdown
    • destructiveHint: true
Only reads 6Claude Code: allow
  • anvil_current_userGet the authenticated Anvil user (from the API key) and the organizations they belong to (eid, name, slug).No findings

    Why it is in this group

    • The description's first verb is "get": a word for reading.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Current Anvil user
    • readOnlyHint: true
  • anvil_get_castFetch a cast — an Anvil PDF template — by its eid: title, version number, and whether it is a template.No findings

    Why it is in this group

    • The name "anvil_get_cast" says "get": a word for reading.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Get cast (PDF template)
    • readOnlyHint: true
  • anvil_get_etch_packetFetch an Etch e-signature packet by eid: its status, details URL, document group, and every signer (eid, aliasId, name, email, status, routing order).No findings

    Why it is in this group

    • The name "anvil_get_etch_packet" says "get": a word for reading.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Get Etch e-signature packet
    • readOnlyHint: true
  • anvil_get_organizationFetch an Anvil organization and its PDF templates (casts) and workflows (welds).No findings

    Why it is in this group

    • The name "anvil_get_organization" says "get": a word for reading.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Get organization
    • readOnlyHint: true
  • anvil_get_weldFetch a weld — an Anvil workflow — by eid, including its forges (the individual form steps: eid, name, slug).No findings

    Why it is in this group

    • The name "anvil_get_weld" says "get": a word for reading.
    Description, as the server wrote it
    Fetch a weld — an Anvil workflow — by eid, including its forges (the individual form steps: eid, name, slug). GraphQL query: weld.

    Annotations the server declares

    • title: Get weld (workflow)
    • readOnlyHint: true
  • anvil_get_weld_dataFetch a weldData record — a single submission to a weld (workflow) — by eid: completion state, test flag, and creation time.No findings

    Why it is in this group

    • The name "anvil_get_weld_data" says "get": a word for reading.
    Description, as the server wrote it
    Fetch a weldData record — a single submission to a weld (workflow) — by eid: completion state, test flag, and creation time. GraphQL query: weldData.

    Annotations the server declares

    • title: Get weld data (workflow submission)
    • readOnlyHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.16.3. Values in angle brackets are yours to fill in.

claude mcp add --transport http anvil https://anvil.usefulapi.io/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__anvil__anvil_current_user",
      "mcp__anvil__anvil_get_organization",
      "mcp__anvil__anvil_get_cast",
      "mcp__anvil__anvil_get_etch_packet",
      "mcp__anvil__anvil_get_weld",
      "mcp__anvil__anvil_get_weld_data"
    ],
    "ask": [],
    "deny": [
      "mcp__anvil__anvil_fill_pdf",
      "mcp__anvil__anvil_generate_pdf",
      "mcp__anvil__anvil_create_etch_packet",
      "mcp__anvil__anvil_generate_etch_sign_url"
    ]
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as anvil. Review it before you use it.