Reason MCP Server

by reason-machines Your server? Claim it

answering

Reason is answering right now. Last checked 4 min ago. Last commit 15 Oct 2026.

Start and manage Reason cloud coding agents, projects and sessions from any MCP client.

Uptime history 6 days of history

6 days agonow

100.0%

Uptime 24h

92 of 92 checks

—

Tools

hidden behind auth

338 ms

Response time

average over 24h

Stars

last commit 15 Oct 2026

Nothing serious here today

Today is the operative word: we check Reason every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add reason --transport http https://mcp.reasonmachines.com/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "reason": {
      "url": "https://mcp.reasonmachines.com/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.reason]
url = "https://mcp.reasonmachines.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "reason": {
      "url": "https://mcp.reasonmachines.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "reason": {
      "url": "https://mcp.reasonmachines.com/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.reasonmachines.com/mcp	streamable-http	sign-in	364 ms	4 min ago

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Reason — questions

Answers built from our own checks of this server.

Why is there no tool list for Reason?

The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 100.0% of checks in the last 24 hours got a reply.

Is Reason working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 338 ms. The bar chart above shows every period we have measured.

How do I connect Reason?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You sign in through your browser once and the client keeps the session: no key to copy, and it refuses anonymous clients.

How do you sign in to Reason?

No API key is involved. Reason answers our knock with an OAuth challenge, so you authorise it once in your browser and the client keeps the session. That is also why we see no tool list: it will not describe itself to an anonymous client, and that is the server working as intended, not a fault.

How fast is Reason?

It answers our handshake in 338 ms on average, which is faster than 40% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Reason open source?

Yes — it is published under the MIT licence, written in Python, 1 stars on GitHub and 2 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.