SignWell MCP Server
for AI Agents
Connect your AI agent to StackOne's SignWell MCP server and give it 23 MCP tools out of the box. Auth, tool execution, and security all managed.
StackOne 
Coverage
23 Agent Actions
Agents can read, write, delete and run operations in SignWell. Extend your agent's capabilities with custom actions.
Authentication
Agent Tool Authentication
Per-user OAuth in one call. Your SignWell MCP server gets session-scoped tokens with zero credentials stored on your infra.
Agent Auth →
Security
Agent Protection
Every SignWell tool response scanned for prompt injection in milliseconds, with 88.7% accuracy, all running on CPU.
Prompt Injection Defense →
Performance
Max Agent Context. Min Cost.
Free up to 96% of your agent's context window to enhance reasoning and reduce cost, on every SignWell call.
Tools Discovery →What is the SignWell MCP Server?
A SignWell MCP server lets AI agents read and write SignWell data through the Model Context Protocol, Anthropic's open standard for connecting LLMs to external tools. StackOne's SignWell MCP server ships with 23 pre-built actions, fully extensible via the Connector Builder, plus managed authentication, prompt injection defense, observability, and agent execution runtime. Connect it from MCP clients like Claude Desktop, Claude Code, Cursor, Goose, and VS Code, or from agent frameworks like OpenAI Agents SDK, LangChain, and Vercel AI SDK.
All SignWell MCP Tools
Every StackOne action for SignWell, ready for your agent. Read, write, delete and run operations, scoped to exactly what you need.
Accounts
- Get Account
Retrieve the account's branding, locale, and default settings.
- Update Account
Change account branding, locale, and default document settings.
Bulk Sends
- Create Bulk Send
Send a document to many recipients at once from a CSV.
- List Bulk Sends
Return a paginated list of bulk sends on the account.
Validate Bulk Send CSVs
- Validate Bulk Send CSV
Validate a bulk send CSV.
Documents
- Create Document
Create and optionally send a new document for signing.
- Get Document
Retrieve a document and all of its associated data.
- Delete Document
Permanently remove a document and its data from the account.
Document From Templates
- Create Document From Template
Create a document from one or more templates.
And Send Documents
- Update And Send Document
Update a draft document and send it to recipients.
Reminders
- Send Reminder
Send a signing reminder to a document's recipients.
Authentications
- Update Authentication
Update recipient authentication settings on a document.
Recipients
- Update Recipients
Update the recipients on a document.
Completed Pdfs
- Get Completed Pdf
Retrieve the completed PDF for a document.
NOM-151 Certificates
- Get NOM-151 Certificate
Retrieve the NOM-151 certificate for a document.
Credentials
- Get Credentials
Return the API key and account details for the current connection.
Templates
- Create Template
Build a reusable template from uploaded files and fields.
- Get Template
Retrieve a template including its placeholders and fields.
- Update Template
Modify an existing template's fields, placeholders, and settings.
- Delete Template
Permanently remove a template from the account.
Webhooks
- Create Webhook
Register a callback URL to receive document event notifications.
- List Webhooks
Return all webhook subscriptions configured on the account.
- Delete Webhook
Stop event delivery by removing a webhook subscription.
Set Up Your SignWell MCP Server in Minutes
One endpoint. Any framework. Your agent is talking to SignWell in under 10 lines of code.
Agent Frameworks
JSON{
"mcpServers": {
"stackone": {
"command": "npx",
"args": [
"-y",
"mcp-remote@latest",
"https://api.stackone.com/mcp?x-account-id=<account_id>",
"--header",
"Authorization: Basic <YOUR_BASE64_TOKEN>"
]
}
}
}Platform Resources
Comparing BM25, TF-IDF, and Hybrid Search for MCP Tool Discovery
Benchmarking BM25, TF-IDF, and hybrid search for MCP tool discovery across 916 tools. The 80/20 TF-IDF/BM25 hybrid hits 21% Top-1 accuracy in under 1ms.
10 min
Indirect Prompt Injection Defense for MCP Tools: A Technical Guide
MCP tools that read emails, CRM records, and tickets are indirect prompt injection vectors. Here's how we built a two-tier defense that scans tool results in ~11ms.
12 min
MCP vs A2A: Architecture, Security, and When to Use Each
MCP vs A2A: what each protocol standardizes, how they differ, their shared security risks including indirect prompt injection, and when to use one, both, or a hybrid architecture.
12 min
MCP vs API: What Hundreds of Connector Builds Taught Us
MCP wraps APIs, it doesn't replace them. After building hundreds of connectors that serve both, here's when each approach wins.
14 min read
SignWell MCP Server FAQ
Does StackOne have a SignWell MCP server?
SignWell MCP server vs direct API integration: what's the difference?
How does SignWell authentication work for AI agents?
origin_owner_id.Are SignWell MCP tools vulnerable to prompt injection?
What is the context bloat of a SignWell agent and how do I avoid it?
Can I limit which actions my SignWell agent can access?
Can I create custom agent actions for my SignWell MCP server?
When should I NOT use a SignWell MCP server?
What AI frameworks and AI clients does the StackOne SignWell MCP server support?
Put your AI agents to work
All the tools you need to build and scale AI agent integrations, with best-in-class connectivity, execution, and security.