tool-subagent-mcp

tool-subagent-mcp

MCP server for Code from Spec subagents. Provides confined tools for code generation — the subagent can only read the spec chain and write declared output files.

Tools

• load_chain — returns the complete spec chain for a given logical name, with frontmatter stripped from ancestors and dependencies, duplicate files removed, and existing source files included
• write_file — writes a generated file to disk, validated against the node's implements list

Install

Download the latest release for your platform from Releases and extract the binary into your project's tools/ directory.

Or build from source:

go build -o tools/subagent-mcp ./cmd/subagent-mcp

Configure

Register the server in .claude/settings.json:

{
  "mcpServers": {
    "subagent-mcp": {
      "type": "stdio",
      "command": "tools/subagent-mcp"
    }
  }
}

On Windows, use tools/subagent-mcp.exe as the command.

Usage

The server takes no arguments. Run subagent-mcp --help for usage information.

Usage: subagent-mcp

Starts an MCP server over stdin/stdout for Code from Spec
subagents.

Documentation

• Code from Spec framework
• Getting Started
• Code Generation with Subagents