io.usefulapi/anvil
REMOTE · ANVIL.USEFULAPI.IO · SCANNED SEP 20
Hosted MCP server for Anvil — fill & generate PDFs and run Etch e-signature packets for AI agents.
Available components
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security78
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token. View diagnostics → Pass
- HTTPS enforcement could not be verified: the plaintext port answered with HTTP 401, which proves neither a plaintext path nor enforcement. View diagnostics → Unverified
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
- The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents. View diagnostics → Partial
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability82
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 1100 tokens (~110/item across 10 items; 10 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 10 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 10 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
How do I install the io.usefulapi/anvil MCP server?
io.usefulapi/anvil is a hosted endpoint at https://anvil.usefulapi.io/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · anvil.usefulapi.io
claude mcp add --transport http io-usefulapi-anvil 'https://anvil.usefulapi.io/mcp'
{
"mcpServers": {
"io-usefulapi-anvil": {
"url": "https://anvil.usefulapi.io/mcp"
}
}
} {
"servers": {
"io-usefulapi-anvil": {
"type": "http",
"url": "https://anvil.usefulapi.io/mcp"
}
}
} [mcp_servers.io-usefulapi-anvil] url = "https://anvil.usefulapi.io/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"io-usefulapi-anvil": {
"type": "remote",
"url": "https://anvil.usefulapi.io/mcp",
"enabled": true
}
}
} openclaw mcp add io-usefulapi-anvil --url 'https://anvil.usefulapi.io/mcp' --transport streamable-http
mcp_servers:
io-usefulapi-anvil:
url: "https://anvil.usefulapi.io/mcp" {
"McpServers": {
"io-usefulapi-anvil": {
"Transport": "http",
"Url": "https://anvil.usefulapi.io/mcp"
}
}
} assistant mcp add io-usefulapi-anvil -t streamable-http -u 'https://anvil.usefulapi.io/mcp'
{
"mcpServers": {
"io-usefulapi-anvil": {
"type": "http",
"url": "https://anvil.usefulapi.io/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 19 Sept 26 0
- Stability: 0.97 → pass security
- 18 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.
- 15 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.
- 13 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.
- 12 Sept 26 +14
- Authorization: unverified → pass ▲ security
- Stability: fail → 0.77 functional
- 11 Sept 26 +41
- Stability: unverified → fail ▼ security
- Injection markers: unverified → pass ▲ security
- Authorization: Authorisation not fully verified: this server exposes a tool marked destructive (anvil_fill_pdf) and its handshake is open, but we could not confirm whether a tool call is gated, so we do not assert it is callable unauthenticated. security
- MCP protocol: unverified → fail ▼ functional
- Endpoint reachability: behind authorisation → reachable ▲ functional
- Tool coverage: unverified → 100 ▲ functional
- 10 Sept 26 −54
- Endpoint reachability: reachable → behind authorisation ▼ security
- Authorization: pass → unverified ▼ security
- Tool safety: pass → unverified ▼ security
- Stability: 0.67 → unverified ▼ security
- Capabilities: fail → unverified ▼ functional
- Tool coverage: 100 → unverified ▼ functional
- Schema quality: Schema blocked by authentication: the endpoint requires auth we don't have to read it. functional
- 9 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 20 Sept 2026 · Probed https://anvil.usefulapi.io/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=usefulapi.io | CN=WE1,O=Google Trust Services,C=US | 14 Sept 2026 | 13 Dec 2026 | ECDSA 256 | ECDSA-SHA256 | d0eb2295d97c81f31344dd1923df1576 |
| SANs: usefulapi.io, anvil.usefulapi.io, *.anvil.usefulapi.io | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of anvil.usefulapi.io. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| io. | present | 57355 | 8 | Verified |
| usefulapi.io. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication Enforced and verified
The endpoint asked for a token and published valid RFC 9728 metadata describing how to get one.
| Result | Enforced and verified |
|---|---|
| Enforced | On tool calls |
| HTTP status | 200 |
WWW-Authenticate challenge Bearer realm="OAuth", resource_metadata="https://anvil.usefulapi.io/.well-known/oauth-protected-resource/mcp", error="invalid_token", error_description="Missing or invalid access token"
Bearer realm="OAuth", resource_metadata="https://anvil.usefulapi.io/.well-known/oauth-protected-resource/mcp", error="invalid_token", error_description="Missing or invalid access token"Protected resource metadata
| Document | https://anvil.usefulapi.io/.well-known/oauth-protected-resource/mcp |
|---|---|
| Retrieved | Yes |
| Resource | https://anvil.usefulapi.io/mcp |
| Authorisation server | https://anvil.usefulapi.io |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://anvil.usefulapi.io/mcp | Verified | 200 | |
| http (plaintext) | http://anvil.usefulapi.io/mcp | Inconclusive | 401 |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
anvil_create_etch_packet Create Etch e-signature packet ~255
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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. |
| isDraft | boolean | – | Default true. When true, creates a draft and sends nothing. Set false to activate and email signers. |
| isTest | boolean | – | Set true to create a test packet (no legal weight, no charge). |
| name | string | yes | Human-readable name for the packet. |
| signatureEmailBody | string | – | Optional body text for the signature-request email. |
| signatureEmailSubject | string | – | Optional subject line for the signature-request email. |
| signers | array | – | Array of signer objects, e.g. [{ id, name, email, signerType, routingOrder, fields }]. Passed straight through to Anvil. |
No output schema declared.
No examples provided.
anvil_current_user Current Anvil user ~56
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.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
anvil_fill_pdf Fill a PDF template ~182
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.
| Name | Type | Req | Description |
|---|---|---|---|
| cast_eid | string | yes | The cast (PDF template) eid to fill (from anvil_get_cast). |
| data | object | yes | Object mapping the template's field aliases to values, e.g. { "name": "Sam", "date": "2026-07-16" }. |
| fontSize | number | – | Optional default font size for filled text. |
| textColor | string | – | Optional default text color as a hex string, e.g. #333333. |
| title | string | – | Optional title embedded in the generated PDF metadata. |
No output schema declared.
No examples provided.
anvil_generate_etch_sign_url Generate Etch signing URL ~98
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 }.
| Name | Type | Req | Description |
|---|---|---|---|
| client_user_id | string | yes | Your app's stable id for the signing user (ties the session to your user). |
| signer_eid | string | yes | The signer eid (from the packet's documentGroup.signers). |
No output schema declared.
No examples provided.
anvil_generate_pdf Generate a PDF from HTML or Markdown ~147
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 }.
| Name | Type | Req | Description |
|---|---|---|---|
| data | – | yes | For html: { html: "<h1>Hi</h1>", css?: "..." }. For markdown: [ { label: "Section", content: "# Title\n..." }, ... ]. |
| title | string | – | Optional title embedded in the generated PDF metadata. |
| type | string | – | Source format. Default html. |
No output schema declared.
No examples provided.
anvil_get_cast Get cast (PDF template) ~71
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.
| Name | Type | Req | Description |
|---|---|---|---|
| eid | string | yes | The cast (PDF template) eid. |
No output schema declared.
No examples provided.
anvil_get_etch_packet Get Etch e-signature packet ~86
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.
| Name | Type | Req | Description |
|---|---|---|---|
| eid | string | yes | The Etch packet eid (returned by anvil_create_etch_packet). |
No output schema declared.
No examples provided.
anvil_get_organization Get organization ~84
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.
| Name | Type | Req | Description |
|---|---|---|---|
| eid | string | – | Organization eid. Provide this OR slug. |
| slug | string | – | Organization slug (from anvil_current_user). Provide this OR eid. |
No output schema declared.
No examples provided.
anvil_get_weld Get weld (workflow) ~58
Fetch a weld — an Anvil workflow — by eid, including its forges (the individual form steps: eid, name, slug). GraphQL query: weld.
| Name | Type | Req | Description |
|---|---|---|---|
| eid | string | yes | The weld (workflow) eid. |
No output schema declared.
No examples provided.
anvil_get_weld_data Get weld data (workflow submission) ~63
Fetch a weldData record — a single submission to a weld (workflow) — by eid: completion state, test flag, and creation time. GraphQL query: weldData.
| Name | Type | Req | Description |
|---|---|---|---|
| eid | string | yes | The weldData (workflow submission) eid. |
No output schema declared.
No examples provided.
What is the io.usefulapi/anvil MCP server?
io.usefulapi/anvil is an MCP server listed in the public MCP registry as io.usefulapi/anvil. Hosted MCP server for Anvil, fill & generate PDFs and run Etch e-signature packets for AI agents. This page covers its hosted endpoint (https://anvil.usefulapi.io/mcp).
Is the io.usefulapi/anvil MCP server safe to use?
io.usefulapi/anvil scores 86 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the io.usefulapi/anvil MCP server expose?
io.usefulapi/anvil exposes 10 tools: anvil_current_user, anvil_get_organization, anvil_get_cast, anvil_get_etch_packet, anvil_get_weld, and 5 more. Their descriptions and schemas cost roughly 1,100 tokens of context every time the server is loaded.
Does the io.usefulapi/anvil MCP server require authentication?
Yes. io.usefulapi/anvil asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.
Is the io.usefulapi/anvil MCP server still maintained?
io.usefulapi/anvil is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.