Stellar MCP Server

Last Updated: 2026-07-04

The Stellar MCP server lets you chat with your experiment data from any AI assistant that supports the Model Context Protocol — Claude, Cursor, ChatGPT and more. Ask questions like “How is my pricing page experiment doing?” or “Which variant is winning this month?” and your assistant pulls live, read-only data from every project you have access to.

Quick Setup

1. Go to your Account page and generate a personal MCP key in the Stellar MCP section. Keys look like stlu_... and are shown only once.
2. Add the Stellar MCP server to your AI client using the endpoint below, passing your key as a Bearer token.
3. Ask your assistant to list your Stellar projects — you're ready to go.

Endpoint:       https://api.gostellar.app/mcp
Authentication: Authorization: Bearer stlu_YOUR_KEY

Client Configuration

Cursor

Add this to ~/.cursor/mcp.json (or your project's .cursor/mcp.json):

{
  "mcpServers": {
    "stellar": {
      "url": "https://api.gostellar.app/mcp",
      "headers": {
        "Authorization": "Bearer stlu_YOUR_KEY"
      }
    }
  }
}

Claude Desktop

Claude Desktop connects to remote servers through the mcp-remote bridge. Add this to claude_desktop_config.json:

{
  "mcpServers": {
    "stellar": {
      "command": "npx",
      "args": [
        "mcp-remote",
        "https://api.gostellar.app/mcp",
        "--header",
        "Authorization: Bearer stlu_YOUR_KEY"
      ]
    }
  }
}

Other clients

Any MCP client that supports remote servers over Streamable HTTP works. If your client supports custom headers, point it at https://api.gostellar.app/mcp with the Authorization header above. If it only supports local (stdio) servers, use the mcp-remote bridge as in the Claude Desktop example.

Available Tools

All tools are read-only. Your assistant decides which to call based on your question.

Example questions

• “Which of my experiments reached significance?”
• “Compare conversion rates for the homepage hero test over the last 30 days.”
• “How close am I to my monthly MTU limit?”
• “Where do visitors drop off in my checkout funnel, and what do they click instead?”
• “Summarize the CRO opportunities Stellar found on my pricing page.”

Security & Guardrails

• Read-only. The MCP server cannot create, modify, launch or delete anything.
• Scoped to your projects. Every tool call re-verifies that you are a member of the requested project. Your key never exposes other customers' data.
• No raw database access. Tools return the same curated metrics you see in the dashboard — your assistant does the reasoning, not our database.
• Revocable. Regenerating or revoking your key from the Account page immediately invalidates the old one.

Rate Limits

The MCP endpoint is rate-limited to 120 requests per minute. If you exceed this you'll receive a 429 Too Many Requests response; your assistant will typically retry automatically.