sv-tools/pkgsite-mcp

pkgsite-mcp

An MCP server that exposes the pkg.go.dev API as tools, so an LLM can search for Go packages and inspect modules, packages, symbols, importers, and vulnerabilities — without downloading anything.

It wraps the pkg.go.dev v1beta HTTP API (see the announcement), the same API used by the pkgsite-cli reference client. The server speaks MCP over stdio, the transport used by Claude Code, Claude Desktop, and most IDE integrations.

Install

go install github.com/sv-tools/pkgsite-mcp@latest

This installs the pkgsite-mcp binary into $(go env GOPATH)/bin.

Use with Claude Code

claude mcp add pkgsite --scope=user -- pkgsite-mcp

Use with Codex

codex mcp add pkgsite -- pkgsite-mcp

Use with Claude Desktop / other MCP clients

Add the server to your client's MCP config (for Claude Desktop, claude_desktop_config.json):

{
  "mcpServers": {
    "pkgsite": {
      "command": "pkgsite-mcp"
    }
  }
}

Use the absolute path to the binary if it is not on your PATH.

Tools

| Tool | Description | |------------------------|--------------------------------------------------------------------------------------------------| | search | Search pkg.go.dev for packages by name or keywords. | | get_package | Package details: module, version, synopsis, and optionally rendered docs, imports, and licenses. | | get_package_symbols | Exported symbols (functions, types, methods, vars, consts) of a package. | | get_imported_by | Packages from other modules that import a given package (re