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brevix-shrink
brevix-shrink/index.js

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Readme

brevix-shrink

MCP middleware proxy that compresses tool/prompt/resource descriptions to save tokens.

brevix-shrink sits between an MCP client (Claude Desktop, Claude Code, Cursor, etc.) and an upstream MCP server. It intercepts tools/list, prompts/list, resources/list, and resources/templates/list responses, then runs Brevix's compression rules on description-style fields. Code, URLs, identifiers, and error quotes are preserved.

Why: MCP servers ship verbose descriptions for every tool. Those descriptions are loaded into the model's input on every session. Compressing them once at the proxy saves input tokens for the whole session lifetime.

Install

npm install -g brevix-shrink
# or run on demand
npx brevix-shrink <upstream> [args...]

Usage

Wrap any MCP server command:

brevix-shrink npx -y @modelcontextprotocol/server-filesystem /tmp

{
  "mcpServers": {
    "fs-shrunk": {
      "command": "npx",
      "args": ["-y", "brevix-shrink", "npx", "-y",
               "@modelcontextprotocol/server-filesystem", "/tmp"]
    }
  }
}

Configuration

Env var	Default	Effect
`BREVIX_SHRINK_FIELDS`	`description,prompt,instructions`	Comma-separated field names to compress
`BREVIX_SHRINK_DEBUG`	unset	Log proxy events to stderr

License

MIT