Live 27 Actions

Lumin MCP Server
for AI Agents

Q: What AI frameworks and AI clients does the StackOne Lumin MCP server support?

The StackOne Lumin MCP server supports both. MCP clients (paste-and-go apps): Claude Desktop, Claude Code, Cursor, VS Code, Goose. Agent frameworks (code SDKs you build with): OpenAI Agents SDK, Anthropic, Vercel AI, Google ADK, CrewAI, Pydantic AI, LangChain, LangGraph, Azure AI Foundry.

Connect your AI agent to StackOne's Lumin MCP server and give it 27 MCP tools out of the box. Auth, tool execution, and security all managed.

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Lumin MCP Server

Built by

StackOne

Coverage

27 Agent Actions

Agents can read, write and run operations in Lumin. Extend your agent's capabilities with custom actions.

MCP Actions → Build Actions →

Authentication

Agent Tool Authentication

Per-user OAuth in one call. Your Lumin MCP server gets session-scoped tokens with zero credentials stored on your infra.

Agent Auth →

Security

Agent Protection

Every Lumin 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 Lumin call.

Tools Discovery →

What is the Lumin MCP Server?

A Lumin MCP server lets AI agents read and write Lumin data through the Model Context Protocol, Anthropic's open standard for connecting LLMs to external tools. StackOne's Lumin MCP server ships with 27 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 Lumin MCP Tools

Every StackOne action for Lumin, ready for your agent. Read, write and run operations, scoped to exactly what you need.

Passwords

Add Password
Add or change password protection on a PDF document and return the encrypted file as a temporary download URL.
Remove Password
Remove password protection from a PDF document and return the unprotected file as a temporary download URL.

Signature Requests

Send Signature Request
Creates and sends a new signature request with the submitted documents.
Get Signature Request
Returns the information of the signature request.
Update Signature Request
Update the due date of an existing signature request.

Spaces

Create Space
Create a new Space within the authorized Workspace.
List Spaces
Return a paginated list of Spaces within the authorized Workspace.

Other (20)

Create Agreement
Create a new AgreementGen document from a AgreementGen template.
Create Document
Create and save a PDF file in the user's Workspace.
Send Signature Request From Template
Creates and sends a new signature request from a template with the submitted template data.
Create Signing Session
Returns a short-lived embedded-signing session URL (`sign_url`) for a single recipient on an existing signature request. Load this URL into the `@luminpdf/lumin-embed-signing-sdk` iframe to render the signing experience inline.
Send Reminder Emails
Send reminder emails to selected signers under a signature request whose signer status is `NEED_TO_SIGN`.
Get Agreement File
Obtain a downloadable file or binary PDF data from an AgreementGen document.
Get Signing Link
Returns a signing link for an existing signature request. This enables presenting signing links within your own applications (mobile apps, web portals, etc.) instead of relying solely on email-based signing flows.
Get Signature Request File
Obtain the file of the Signature Request by id. This endpoint supports returning different types of files: - The agreement itself - The Certificate of Completion (CoC) - A merged PDF which combines both the agreement and the CoC
List Templates
Returns a paginated list of templates in a Lumin Workspace, including AgreementGen, Sign and PDF templates.
Get Template Details
Returns essential template details for a specific template.
Get User Information
Get information of current user
Get Workspace Information
Return information of the authorized Workspace.
Get Workspace Members
Return a paginated list of members in a Workspace.
Merge Documents
Merge multiple documents into a single PDF file and return a temporary download URL.
Compress Document
Compress a PDF document to reduce its file size and return a temporary download URL.
Split Document
Split or extract pages from a PDF document into one or more output files and return a temporary download URL.
Summarize Document
Generate a concise AI-powered summary of a PDF document's text content.
Translate Document
Translate a PDF document into a target language while preserving the original formatting, layout, and images.
Cancel Signature Request
Cancel a signature request.
Generate Document From Template
Creates a downloadable PDF document from an existing Lumin template.

Set Up Your Lumin MCP Server in Minutes

One endpoint. Any framework. Your agent is talking to Lumin in under 10 lines of code.

MCP Clients

Agent Frameworks

Claude Desktop-

JSON

Claude Desktop Docs

{
  "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>"
      ]
    }
  }
}

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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

Lumin MCP Server FAQ

Does StackOne have a Lumin MCP server?

Yes. StackOne offers a hosted Lumin MCP server with 27 pre-built actions, and every action is tested and QA'd by StackOne. Connect it to Claude, Cursor, and any other MCP client, or to any agent framework through the AI Action SDK. It ships with managed agent authentication, prompt injection defense, and tool discovery with server-side execution that preserve your agent's context window and keep reasoning performance.

Lumin MCP server vs direct API integration: what's the difference?

A Lumin MCP server and direct API integration serve different use cases. Direct API integration is for software-to-software work, where backend code calls Lumin. A Lumin MCP server is for AI agents that discover and call Lumin at runtime, such as MCP clients like Claude and Cursor, plus framework agents built with OpenAI, LangChain, or Vercel AI. StackOne provides both.

How does Lumin authentication work for AI agents?

Lumin authentication for AI agents works through a StackOne Connect Session. Create one via the dashboard or the SDK to get an auth link and ready-to-paste config for Claude Desktop, Cursor, and other MCP clients. Your user authenticates their own Lumin account; StackOne handles token exchange, storage, and refresh. Credentials never reach the LLM, and each user is isolated via origin_owner_id.

Are Lumin MCP tools vulnerable to prompt injection?

Yes. Lumin MCP tools can be vulnerable to indirect prompt injection. Any tool that reads user-written content, such as documents, messages, tickets, records, or free-text fields, is a potential vector. StackOne Defender scans every tool response before it enters the agent's context. It runs regex patterns in ~1ms, then a MiniLM classifier in ~4ms. Accuracy is 88.7%, and it runs entirely on CPU.

What is the context bloat of a Lumin agent and how do I avoid it?

Context bloat happens when Lumin tool schemas and API responses eat your Lumin agent's memory, preventing it from reasoning effectively. A single Lumin query can return a massive JSON response, and connecting multiple tools compounds the problem. Tools Discovery reduces it by loading only the tools relevant to each query.

Can I limit which actions my Lumin agent can access?

Yes. You can limit which actions your Lumin agent can access directly from the StackOne dashboard. Toggle actions on or off, or restrict them to specific accounts, with no code changes to your agent. Session tokens can be scoped to exact actions so if one leaks, exposure stays contained.

Can I create custom agent actions for my Lumin MCP server?

Yes. You can create custom agent actions for your Lumin MCP server using Connector Builder. It's an integration agent your coding assistant (Claude Code, Cursor, or Copilot) can invoke to research Lumin's API, generate production-ready connector YAML, test against the live API, and validate before you ship.

When should I NOT use a Lumin MCP server?

Skip a Lumin MCP server if your integration is purely software-to-software, because direct Lumin API integration is simpler when no AI agent is involved. For deterministic, compliance-critical operations (financial transactions, regulatory reporting), direct API gives you predictable behavior without agent-driven decision-making. MCP shines when AI agents need to dynamically discover and call Lumin actions at runtime.

What AI frameworks and AI clients does the StackOne Lumin MCP server support?

The StackOne Lumin MCP server supports both. MCP clients (paste-and-go apps): Claude Desktop, Claude Code, Cursor, VS Code, Goose. Agent frameworks (code SDKs you build with): OpenAI Agents SDK, Anthropic, Vercel AI, Google ADK, CrewAI, Pydantic AI, LangChain, LangGraph, Azure AI Foundry.

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.

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Lumin MCP Serverfor AI Agents