ChatCrystal MCP Server

Name: ChatCrystal MCP Server
Author: io.github.ZengLiangYi

io.github.ZengLiangYi/chatcrystal

Repository Registry

What is the ChatCrystal MCP server?

Local-first AI PKM memory for coding conversations.

How to install ChatCrystal

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

CHATCRYSTAL_BASE_URL
Optional ChatCrystal Core URL. Leave empty to use the local default at http://localhost:3721.
CHATCRYSTAL_API_TOKEN
secret
Optional token for a protected ChatCrystal Cloud or remote instance.

Claude Desktop

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

{
  "mcpServers": {
    "chatcrystal": {
      "command": "npx",
      "args": [
        "-y",
        "chatcrystal",
        "-y",
        "mcp"
      ],
      "env": {
        "CHATCRYSTAL_BASE_URL": "<YOUR_CHATCRYSTAL_BASE_URL>",
        "CHATCRYSTAL_API_TOKEN": "<YOUR_CHATCRYSTAL_API_TOKEN>"
      }
    }
  }
}

Cursor

~/.cursor/mcp.json

{
  "mcpServers": {
    "chatcrystal": {
      "command": "npx",
      "args": [
        "-y",
        "chatcrystal",
        "-y",
        "mcp"
      ],
      "env": {
        "CHATCRYSTAL_BASE_URL": "<YOUR_CHATCRYSTAL_BASE_URL>",
        "CHATCRYSTAL_API_TOKEN": "<YOUR_CHATCRYSTAL_API_TOKEN>"
      }
    }
  }
}

Windsurf

~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "chatcrystal": {
      "command": "npx",
      "args": [
        "-y",
        "chatcrystal",
        "-y",
        "mcp"
      ],
      "env": {
        "CHATCRYSTAL_BASE_URL": "<YOUR_CHATCRYSTAL_BASE_URL>",
        "CHATCRYSTAL_API_TOKEN": "<YOUR_CHATCRYSTAL_API_TOKEN>"
      }
    }
  }
}

VS Code

.vscode/mcp.json

{
  "servers": {
    "chatcrystal": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "chatcrystal",
        "-y",
        "mcp"
      ],
      "env": {
        "CHATCRYSTAL_BASE_URL": "<YOUR_CHATCRYSTAL_BASE_URL>",
        "CHATCRYSTAL_API_TOKEN": "<YOUR_CHATCRYSTAL_API_TOKEN>"
      }
    }
  }
}

Claude Code

claude mcp add chatcrystal --env CHATCRYSTAL_BASE_URL=<YOUR_CHATCRYSTAL_BASE_URL> --env CHATCRYSTAL_API_TOKEN=<YOUR_CHATCRYSTAL_API_TOKEN> -- npx -y chatcrystal -y mcp