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Knowl MCP Server

answering

Knowl is answering right now. Last checked 6 min ago. 509 installs a week from npm. Last commit 16 Sep 2026.

Persistent memory for Claude Code, Cursor and Codex. Facts retire when they change.

Installs per day peak 397 · avg 145 · -41% w/w
a month agotoday
Uptime history 9 days of history · worst day 99%
9 days agonow
100.0%
Uptime 24h
92 of 92 checks
Tools
hidden behind auth
495 ms
Response time
average over 24h
509
Installs / week
npm and PyPI

What the code does

We read the source, 19 h ago · rules 3dff92dd89df

A tool parameter reaches a dangerous call

A value the model can set ends up inside a file or shell call. That is not a flaw by itself — for a terminal server it is the job — but it is where things go wrong when it is not.

A tool parameter reaches a dangerous call knowl_store.category → integrations/hermes/knowl/__init__.py:456
            proc = subprocess.run(
Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

      const child = spawn(command, ['agent-hook', 'cline', event, '--json'], {
  const pathname = path.join(projectRoot, target.file);
Builds a database query by concatenation src/mcp/tool-schema.ts:210
const QUERY_LEAK = /Failed query:|\bparams:\s|\binsert into\b|\bdelete from\b|\bcreate table\b|\bupdate\s+"?[a-z_]+"?\s+set\b|\bselect\b[\s\S]{0,200}?\bfrom\b/i;
Touches key and credential files src/core/knowledge-validation.ts:43
const SENSITIVE_PATH = /(^|[\\/])(?:\.env(?:\.[^\\/]+)?|[^\\/]*(?:credential|secret)[^\\/]*|id_rsa(?:\.pub)?|[^\\/]*\.(?:pem|p12|pfx|key))$/i;

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

A tool parameter here reaches a dangerous call

That is not a flaw by itself — but it is where things go wrong when it is not the job. We re-read this code on every release. Watch it and you hear from us the day another one appears.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 6 min ago.

run in your terminal
claude mcp add knowl --transport http https://api.knowl.cloud/mcp/
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "knowl": {
      "url": "https://api.knowl.cloud/mcp/"
    }
  }
}
~/.codex/config.toml
[mcp_servers.knowl]
url = "https://api.knowl.cloud/mcp/"
.cursor/mcp.json
{
  "mcpServers": {
    "knowl": {
      "url": "https://api.knowl.cloud/mcp/"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "knowl": {
      "url": "https://api.knowl.cloud/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

URLTransportStateLatencyChecked
https://api.knowl.cloud/mcp/ streamable-http sign-in 418 ms 6 min ago

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Knowl — questions

Answers built from our own checks of this server.

Why is there no tool list for Knowl?
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 Knowl 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 495 ms. The bar chart above shows every period we have measured.
How do I connect Knowl?
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 Knowl?
No API key is involved. Knowl 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 Knowl?
It answers our handshake in 495 ms on average, which is faster than 29% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
How many people use Knowl?
The npm package @dat999zx/knowl was installed 509 times in the last week. Week over week that is -41%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is Knowl open source?
Yes — it is published under the Apache-2.0 licence, written in TypeScript, 89 stars on GitHub and 3 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.