Crux

Verified Integration

Author: @CueCrux•Category: ServerApplication

GitHub Repository

JSON-RPC 2.0

Protocol Standard

Sub-second

Execution Latency

Active

Operational Status

Client Configuration

— Connect Crux to Claude Desktop or Cursor in seconds

{
  "mcpServers": {
    "crux-2": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-crux-2"
      ],
      "env": {}
    }
  }
}

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows).

Architecture & Capabilities

System Overview

Provides a local-first memory daemon for AI agents, offering versioned fact storage, token-budgeted retrieval, and cryptographic receipts for all writes.

Indexed Date

7/23/2026

License

Open Source

Protocol Layer

stdio / SSE RPC

Frequently Asked Questions

Architecture and operational details for Crux

Crux utilizes a token-budgeted BM25 + graph retrieval system that significantly reduces context window usage by 60-80% compared to traditional top-K context stuffing. It prioritizes metadata and token counts, delivering content only within budget.

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