lain-mcp

Architectural code intelligence for AI coding agents.

Installation

npm install -g lain-mcp

Or with npx (downloads binary on first run):

npx lain-mcp --workspace /path/to/project

What this installs

• Binary: ~/.lain/bin/lain — the Lain executable (downloaded from GitHub releases)
• Config: ~/.lain/tuning.toml — default tuning parameters
• Toolchains: ~/.lain/toolchains/ — empty dir for user toolchain overrides
• Models: ~/.lain/models/ — empty dir for ONNX embedding models (optional)

Configuration

Edit ~/.lain/tuning.toml to customize Lain's behavior. All values are optional — omit a field to use the built-in default.

Usage

After installation, add Lain to your MCP configuration:

{
  "mcpServers": {
    "lain": {
      "command": "lain",
      "args": ["--workspace", "/path/to/your/project"]
    }
  }
}

Or run directly:

~/.lain/bin/lain --workspace /path/to/project --transport stdio

Uninstall

npm uninstall -g lain-mcp
# Binary and config remain in ~/.lain/ — delete manually to fully remove
rm -rf ~/.lain