Substrate MCP Server

by trysubstrate Your server? Claim it

answering

Substrate is answering right now. Last checked moments ago. Last commit 4 Nov 2026.

Shared memory MCP server for Claude Code, Codex, Gemini CLI and Cursor. Cited, editable.

Uptime history 6 hours of history

6 hours agonow

100.0%

Uptime 24h

18 of 18 checks

—

Tools

hidden behind auth

461 ms

Response time

average over 24h

Stars

last commit 4 Nov 2026

Nothing serious here today

Today is the operative word: we check Substrate 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 0 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add memory --transport http https://app.trysubstrate.co/mcp

Settings → Connectors → Add custom connector, then paste this address

https://app.trysubstrate.co/mcp

~/.codex/config.toml

[mcp_servers.memory]
url = "https://app.trysubstrate.co/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "memory": {
      "url": "https://app.trysubstrate.co/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "memory": {
      "type": "http",
      "url": "https://app.trysubstrate.co/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://app.trysubstrate.co/mcp	streamable-http	sign-in	504 ms	0 min ago

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Substrate — questions

Answers built from our own checks of this server.

Why is there no tool list for Substrate?

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 Substrate working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 18 of 18 checks got a reply (100.0%), average response time 461 ms. The bar chart above shows every period we have measured.

How do I connect Substrate?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form 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 Substrate?

No API key is involved. Substrate 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 Substrate?

It answers our handshake in 461 ms on average, which is faster than 28% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Substrate open source?

The code is open source: it is published under the MIT licence, written in Python and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at app.trysubstrate.co, which runs on its operator's own terms.