---
title: "signatureapi"
description: "SignatureAPI is an e-signature API for developers: send documents for signature, embed signing in your app, and track progress with webhooks. This plugin adds skills to design, build and troubleshoot your integration and"
canonical: https://agentpluginsdirectory.com/plugins/signatureapi
last-updated: 2026-10-24
---

# signatureapi
SignatureAPI is an e-signature API for developers: send documents for signature, embed signing in your app, and track progress with webhooks. This plugin adds skills to design, build and troubleshoot your integration and answer questions from the docs, plus the hosted MCP server.
- Slug: signatureapi
- Publisher: Superposition Labs, Inc.
- Repository: https://github.com/signatureapi/skills
- Manifest: plugin.json
- Version: 1.3.0
- License: MIT
- Category (editorial): other
- Skills: 4 (signatureapi-architecture, signatureapi-diagnose, signatureapi-docs, signatureapi-integrate)
- MCP servers: 1 (signatureapi)
- Stars: 0
- Repository created: 2026-09-02
- Repository last pushed: 2026-10-21
- Publisher type: Organization
- Listing: https://agentpluginsdirectory.com/plugins/signatureapi
- Schema: https://agent-plugins.org/schemas/1.0.0/plugin.schema.json

## What signatureapi does, in the publisher's words

Agent Skills for SignatureAPI, the e-signature API. Three skills let AI coding agents design, build and troubleshoot e-signature integrations from the command line: one decides how an app should use SignatureAPI and writes the design, one builds the signing flow from that design, one diagnoses a flow that already exists.

From the project README, punctuation lightly normalized. Full text: https://raw.githubusercontent.com/signatureapi/skills/HEAD/README.md

## Skills

- signatureapi-architecture: Use when someone asks how to use SignatureAPI in their app, or plans or designs a signing flow or a signing product. Use when someone asks for 'a platform like DocuSign'. Use for any request to add SignatureAPI that is not a narrow change to an existing flow. Use it before any application code exis…
- signatureapi-diagnose: SignatureAPI failure runbook. Use when an envelope is stuck in processing, a signature webhook never arrived, or a recipient never got the signing email. Also use when a deliverable is missing after completion, or the API returns 422 on envelope creation. Use it even for a seemingly simple case lik…
- signatureapi-docs
- signatureapi-integrate: Use when building or changing an integration with SignatureAPI: creating envelopes, placing signature fields, wiring up SignatureAPI webhooks, or verifying a signing flow end to end. Use it even for a seemingly simple task like creating a single envelope, and in any host, including one with no repo…

Descriptions come from the frontmatter of each SKILL.md, punctuation lightly normalized.

## MCP servers

- signatureapi: transport: streamable-http; url: https://mcp.signatureapi.com/mcp

Read from the plugin's own mcp.json. Environment variable names only, never values.