Cello Client

Verified Integration

Author: @scanning•Category: ServerApplication

GitHub Repository

JSON-RPC 2.0

Protocol Standard

Sub-second

Execution Latency

Active

Operational Status

Client Configuration

— Connect Cello Client to Claude Desktop or Cursor in seconds

{
  "mcpServers": {
    "cello-client": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-cello-client"
      ],
      "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 an official client for the CELLO protocol, including an MCP server and native adapters for various agent variants.

Indexed Date

7/21/2026

License

Open Source

Protocol Layer

stdio / SSE RPC

Frequently Asked Questions

Architecture and operational details for Cello Client

It enhances security by scanning all incoming messages for prompt injection attacks, cryptographically signing and hashing outgoing messages for authenticity, and Merkle-recording conversations to ensure non-repudiation.

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