Extend MCP server

Extend is the official remote MCP server from extend.ai. It answers at https://mcp.extend.ai/mcp over streamable HTTP and asks you to sign in with your extend.ai account before it lists its tools, so your client opens a login the first time it connects. Our probes reached it 11 of 11 times since 3 September 2026; the last check, on 19 October 2026, got the sign-in challenge, so it is up.

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Description as the publisher wrote it.

What Extend needs before it works

A sign-in. The server refused to list its tools to an anonymous client and answered with an authentication challenge, which is how an MCP server protected by OAuth behaves. Add it with one of the setups below; the first connection opens a login for your extend.ai account, and the tools appear once you have approved it.

Add Extend to your AI client

Every block below points at https://mcp.extend.ai/mcp. Pick your client and copy.

claude mcp add --transport http extend https://mcp.extend.ai/mcp

{
  "mcpServers": {
    "extend": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://mcp.extend.ai/mcp"]
    }
  }
}

{
  "mcpServers": {
    "extend": {
      "url": "https://mcp.extend.ai/mcp"
    }
  }
}

{
  "servers": {
    "extend": {
      "type": "http",
      "url": "https://mcp.extend.ai/mcp"
    }
  }
}

{
  "context_servers": {
    "extend": {
      "url": "https://mcp.extend.ai/mcp"
    }
  }
}

{
  "mcpServers": {
    "extend": {
      "serverUrl": "https://mcp.extend.ai/mcp"
    }
  }
}

{
  "mcpServers": {
    "extend": {
      "url": "https://mcp.extend.ai/mcp"
    }
  }
}

name: Extend
version: 0.0.1
schema: v1
mcpServers:
  - name: Extend
    type: streamable-http
    url: https://mcp.extend.ai/mcp

{
  "mcpServers": {
    "extend": {
      "httpUrl": "https://mcp.extend.ai/mcp"
    }
  }
}

{
  "mcpServers": {
    "extend": {
      "type": "http",
      "url": "https://mcp.extend.ai/mcp"
    }
  }
}

{
  "mcpServers": {
    "extend": {
      "url": "https://mcp.extend.ai/mcp"
    }
  }
}

goose://extension?url=https%3A%2F%2Fmcp.extend.ai%2Fmcp&type=streamable_http&id=extend&name=Extend

Is Extend up right now?

It answered our last check on 19 October 2026 in 556 ms. Over 11 checks since 3 September 2026 it answered 11. Status here comes from Neuronto's own probes, not from the publisher.

MCP servers similar to Extend

Questions about Extend

Is there an official Extend MCP server?

Yes. It is published by extend.ai and served from mcp.extend.ai, the vendor's own domain: https://mcp.extend.ai/mcp.

How do I sign in to Extend?

Add the server with a setup above. The first time your client connects it opens the sign-in page for extend.ai; approve it and the tools load.

Is Extend down?

It answered our last check on 19 October 2026 in 556 ms. Over 11 checks since 3 September 2026 it answered 11.

How do I add Extend to Cursor?

Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://mcp.extend.ai/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.

Does Extend need an API key?

It needs a sign-in rather than a key you paste: the server answered with an authentication challenge, so your client runs the login when it first connects.

Where this comes from

Publisher: ai.extend. Endpoint host: mcp.extend.ai. ARD identifier: urn:air:ai.extend:mcp:extend. First indexed 3 September 2026. The tools are exactly what the server returned; nothing on this page is inferred from its name. Ranking in Neuronto search is never for sale.