mcpbeat Sign in

ChatCrystal MCP Server

by zengliangyi Your server? Claim it
local only

ChatCrystal runs on your own machine — the client starts it, so there is no endpoint to ping. 441 installs a week from npm. Last commit 23 Oct 2026.

Local-first AI PKM memory for coding conversations.

Installs per day peak 168 · avg 31 · +7% w/w
a month agotoday
441
Installs / week
npm · chatcrystal
61
Stars
0 open issues
23 Oct 2026
Last commit
4 releases in 90 days
Apache-2.0
License
TypeScript

What the code does

We read the source, 1 d ago · rules 995398eba69f

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.

Builds a file path from a variable electron/remote-import-worker.ts:25
    const modulePath = path.join(
        appPath,
        "server",
        "dist",
        "server",
        "src",
        relativeModulePath,

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

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add chatcrystal -- npx -y chatcrystal
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "chatcrystal": {
      "command": "npx",
      "args": [
        "-y",
        "chatcrystal"
      ]
    }
  }
}
~/.codex/config.toml
[mcp_servers.chatcrystal]
command = "npx"
args = ["-y", "chatcrystal"]
.cursor/mcp.json
{
  "mcpServers": {
    "chatcrystal": {
      "command": "npx",
      "args": [
        "-y",
        "chatcrystal"
      ]
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "chatcrystal": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "chatcrystal"
      ]
    }
  }
}

Optional settings from the registry entry, left out of the block above: CHATCRYSTAL_BASE_URL (Optional ChatCrystal Core URL. Leave empty to use the local default at http://localhost:3721), CHATCRYSTAL_API_TOKEN (Optional token for a protected ChatCrystal Cloud or remote instance).

Alternatives to ChatCrystal

same job, measured the same way
PMB AI
by oleksiijko

Local-first persistent memory for AI coding agents.

278 installs/wk local only
Agentos
by officialtanishsharma

Local-first persistent memory MCP server for AI coding agents.

local only
Dreamd
by botzrdev

Local-first, cross-harness memory for AI coding agents.

376 installs/wk local only
Omega Memory
by omega-memory

Persistent memory for AI coding agents. #1 on LongMemEval. Local-first.

local only
CP Memory
by cjhuochai

Local-first, governable long-term memory for AI coding agents

115 installs/wk local only
Context Engine
by shamsundarsk

Local-first persistent context memory MCP server for AI coding agents.

128 installs/wk local only
Memnest
by blue-b

Local memory for coding AIs: search past conversations and decisions from the original text.

local only
Aifp MCP
by wjabanjj

Persistent memory MCP server for AI coding assistants. Chinese-first and fully local.

248 installs/wk local only

ChatCrystal — questions

Answers built from our own checks of this server.

Why is there no uptime for ChatCrystal?
ChatCrystal runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package chatcrystal was installed 441 times last week.
How do I connect ChatCrystal?
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 runs locally, so the command pulls chatcrystal straight from npm; nothing to host, nothing to sign up for.
How many people use ChatCrystal?
The npm package chatcrystal was installed 441 times in the last week. Week over week that is +7%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is ChatCrystal open source?
Yes — it is published under the Apache-2.0 licence, written in TypeScript and 61 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.