mcp-sophon

npm wrapper for Sophon.

Honest token economics for MCP agents. One Rust binary. Zero ML. Reproducible benchmarks.

Sophon is a deterministic context layer for MCP-speaking agents: query-driven prompt compression, conversation memory, code navigation, file delta streaming, output compression. Measured 67 % session token savings, ~10 pts more saved than LLMLingua-2 on structured prompts at 35× lower latency, and parity with mem0 on LOCOMO retrieval at sub-second vs 8.7 minutes. Every number reproducible from BENCHMARK.md.

Installing this package downloads a prebuilt native binary from the matching GitHub release and exposes it as the sophon command.

Install

npm install -g mcp-sophon
sophon --help

Supported platforms (via GitHub Release prebuilds):

| OS | Arch | |---|---| | macOS | arm64, x64 | | Linux | arm64, x64 | | Windows | x64 |

Use as an MCP server

{
  "mcpServers": {
    "sophon": {
      "command": "sophon",
      "args": ["serve"]
    }
  }
}

Environment

• SOPHON_SKIP_DOWNLOAD=1 — do not attempt to download the binary on install (useful in Docker / air-gapped CI). Provide a sophon binary on PATH yourself.
• SOPHON_REPO=org/repo — override which GitHub repository the postinstall fetches from. Defaults to lacausecrypto/mcp-sophon.

See also

• Main README
• Measured benchmarks (BENCHMARK.md)

License

MIT