Surgext

A Model Context Protocol (MCP) server that indexes the Surge XT Synthesizer documentation. It provides tools for AI models to efficiently search and navigate the documentation to assist with sound design and recreation.

Setup

Ensure you have Bun installed.

bun install
bun run build
bun run ingest

The ingest step will download the latest documentation from the surge repository and create a data/chunks.json file.

Tools Provided

• search_docs(query: string, top_k?: number) - Full text search for docs.
• get_section(section: string) - Fetch the content of a specific heading path (e.g. Oscillators > Wavetable).
• list_sections() - Explore the document structure.
• get_parameter_info(parameter_name: string) - Get specific info about knobs and parameters.

Client Configurations

Claude Desktop

Add this to your claude_desktop_config.json:

{
  "mcpServers": {
    "surgext-mcp": {
      "command": "node",
      "args": ["/path/to/surgext-mcp/dist/index.js"]
    }
  }
}

Cursor

In your .cursor/settings.json or global cursor settings under MCP configuration:

{
  "mcp": {
    "servers": {
      "surgext-mcp": {
        "command": "node",
        "args": ["/path/to/surgext-mcp/dist/index.js"]
      }
    }
  }
}

OpenCode

Add the following to your opencode.json configuration:

{
  "mcpServers": {
    "surgext-mcp": {
      "command": "node",
      "args": ["/path/to/surgext-mcp/dist/index.js"]
    }
  }
}

Sample System Prompt for Sound Recreation

If you are using this MCP server to help an AI recreate a specific sound, use this prompt to guide the model:

You are an expert synthesizer patch designer specializing in Surge XT. You have access to the Surge XT Docs MCP server.

When recreating a sound, follow these steps:
1. Use `list_sections()` to understand the available documentation structure.
2. If you are unsure about the overall synth architecture or a specific feature, use `search_docs()`.
3. When deciding how to set a specific knob or control, use `get_parameter_info()` to read the exact documentation for that parameter.
4. Synthesize the patch step-by-step based on your findings.