A
securityA
licenseA
qualityFacilitates searching and accessing programming resources across platforms like Stack Overflow, MDN, GitHub, npm, and PyPI, aiding LLMs in finding code examples and documentation.
Last updated -
6
39
AGPL 3.0
The MCP Package Docs Server provides access to package documentation and Language Server Protocol (LSP) capabilities for multiple programming languages:
Documentation Access: Retrieve structured documentation for Go, Python, NPM, and Rust packages, optionally focusing on specific symbols or versions.
Search Capabilities: Perform fuzzy or exact searches within package documentation across supported languages.
LSP Support: Enable hover information, code completions, and diagnostics for TypeScript/JavaScript files.
Registry Configuration: Support for public and private NPM registries using
.npmrcconfigurations.Filtering Options: Filter documentation by query, section, or maximum length.
Performance Features: Includes caching and efficient parsing with minimal memory footprint.
Provides Language Server Protocol (LSP) support for CSS through vscode-css-language-server
Supports private npm registries including GitHub Packages via .npmrc configuration
Supports private npm registries including GitLab via .npmrc configuration
Provides Language Server Protocol (LSP) support for JavaScript, including hover information, code completions, and diagnostics
Provides documentation lookups for NPM packages via registry documentation, supporting both public and private registries with automatic configuration detection from .npmrc
Provides documentation lookups for Python libraries via built-in help() function, including specific symbol/function lookups and search capabilities
Provides Language Server Protocol (LSP) support for TypeScript, including hover information, code completions, and diagnostics
Package Documentation MCP Server
An MCP (Model Context Protocol) server that provides LLMs with efficient access to package documentation across multiple programming languages and language server protocol (LSP) capabilities.
Features
Multi-Language Support:
Go packages via
go docPython libraries via built-in
help()NPM packages via registry documentation (including private registries)
Rust crates via crates.io and docs.rs
Smart Documentation Parsing:
Structured output with description, usage, and examples
Focused information to avoid context overload
Support for specific symbol/function lookups
Fuzzy and exact search capabilities across documentation
Advanced Search Features:
Search within package documentation
Fuzzy matching for flexible queries
Context-aware results with relevance scoring
Symbol extraction from search results
Language Server Protocol (LSP) Support:
Hover information for code symbols
Code completions
Diagnostics (errors and warnings)
Currently supports TypeScript/JavaScript
Extensible for other languages
Performance Optimised:
Built-in caching
Efficient parsing
Minimal memory footprint
Installation
npx -y mcp-package-docs
Installing via Smithery
To install Package Docs for Claude Desktop automatically via Smithery:
npx -y @smithery/cli install mcp-package-docs --client claude
Usage
As an MCP Server
Add to your MCP settings configuration:
{
"mcpServers": {
"package-docs": {
"command": "npx",
"args": ["-y", "mcp-package-docs"],
"env": {
"ENABLE_LSP": "true" // Optional: Enable Language Server Protocol support
}
}
}
}
The LSP functionality includes default configurations for common language servers:
TypeScript/JavaScript:
typescript-language-server --stdioHTML:
vscode-html-language-server --stdioCSS:
vscode-css-language-server --stdioJSON:
vscode-json-language-server --stdio
You can override these defaults if needed:
{
"mcpServers": {
"package-docs": {
"command": "npx",
"args": ["-y", "mcp-package-docs"],
"env": {
"ENABLE_LSP": "true",
"TYPESCRIPT_SERVER": "{\"command\":\"/custom/path/typescript-language-server\",\"args\":[\"--stdio\"]}"
}
}
}
}
The server provides the following tools:
lookup_go_doc / describe_go_package
Fetches Go package documentation
{
"name": "describe_go_package",
"arguments": {
"package": "encoding/json", // required
"symbol": "Marshal" // optional
}
}
lookup_python_doc / describe_python_package
Fetches Python package documentation
{
"name": "describe_python_package",
"arguments": {
"package": "requests", // required
"symbol": "get" // optional
}
}
describe_rust_package
Fetches Rust crate documentation from crates.io and docs.rs
{
"name": "describe_rust_package",
"arguments": {
"package": "serde", // required: crate name
"version": "1.0.219" // optional: specific version
}
}
search_package_docs
Search within package documentation
{
"name": "search_package_docs",
"arguments": {
"package": "requests", // required: package name
"query": "authentication", // required: search query
"language": "python", // required: "go", "python", "npm", "swift", or "rust"
"fuzzy": true // optional: enable fuzzy matching (default: true)
}
}
lookup_npm_doc / describe_npm_package
Fetches NPM package documentation from both public and private registries. Automatically uses the appropriate registry based on your .npmrc configuration.
{
"name": "describe_npm_package",
"arguments": {
"package": "axios", // required - supports both scoped (@org/pkg) and unscoped packages
"version": "1.6.0" // optional
}
}
The tool reads your ~/.npmrc file to determine the correct registry for each package:
Uses scoped registry configurations (e.g., @mycompany:registry=...)
Supports private registries (GitHub Packages, GitLab, Nexus, Artifactory, etc.)
Falls back to the default npm registry if no custom registry is configured
Example .npmrc configurations:
registry=https://nexus.mycompany.com/repository/npm-group/
@mycompany:registry=https://nexus.mycompany.com/repository/npm-private/
@mycompany-ct:registry=https://npm.pkg.github.com/
Language Server Protocol (LSP) Tools
When LSP support is enabled, the following additional tools become available:
get_hover
Get hover information for a position in a document
{
"name": "get_hover",
"arguments": {
"languageId": "typescript", // required: language identifier (e.g., "typescript", "javascript")
"filePath": "src/index.ts", // required: path to the source file
"content": "const x = 1;", // required: content of the file
"line": 0, // required: zero-based line number
"character": 6, // required: zero-based character position
"projectRoot": "/path/to/project" // optional: project root directory
}
}
get_completions
Get completion suggestions for a position in a document
{
"name": "get_completions",
"arguments": {
"languageId": "typescript", // required: language identifier
"filePath": "src/index.ts", // required: path to the source file
"content": "const arr = []; arr.", // required: content of the file
"line": 0, // required: zero-based line number
"character": 16, // required: zero-based character position
"projectRoot": "/path/to/project" // optional: project root directory
}
}
get_diagnostics
Get diagnostic information (errors, warnings) for a document
{
"name": "get_diagnostics",
"arguments": {
"languageId": "typescript", // required: language identifier
"filePath": "src/index.ts", // required: path to the source file
"content": "const x: string = 1;", // required: content of the file
"projectRoot": "/path/to/project" // optional: project root directory
}
}
Example Usage in an LLM
Looking up Documentation
// Looking up Go documentation
const goDocResult = await use_mcp_tool({
server_name: "package-docs",
tool_name: "describe_go_package",
arguments: {
package: "encoding/json",
symbol: "Marshal"
}
});
// Looking up Python documentation
const pythonDocResult = await use_mcp_tool({
server_name: "package-docs",
tool_name: "describe_python_package",
arguments: {
package: "requests",
symbol: "post"
}
});
// Looking up Rust documentation
const rustDocResult = await use_mcp_tool({
server_name: "package-docs",
tool_name: "describe_rust_package",
arguments: {
package: "serde"
}
});
// Searching within documentation
const searchResult = await use_mcp_tool({
server_name: "package-docs",
tool_name: "search_package_docs",
arguments: {
package: "serde",
query: "serialize",
language: "rust",
fuzzy: true
}
});
// Using LSP for hover information (when LSP is enabled)
const hoverResult = await use_mcp_tool({
server_name: "package-docs",
tool_name: "get_hover",
arguments: {
languageId: "typescript",
filePath: "src/index.ts",
content: "const axios = require('axios');\naxios.get",
line: 1,
character: 7
}
});
Requirements
Node.js >= 20
Go (for Go package documentation)
Python 3 (for Python package documentation)
Internet connection (for NPM package documentation and Rust crate documentation)
Language servers (for LSP functionality):
TypeScript/JavaScript:
npm install -g typescript-language-server typescriptHTML/CSS/JSON:
npm install -g vscode-langservers-extracted
Development
# Install dependencies
npm i
# Build
npm run build
# Watch mode
npm run watch
Contributing
Fork the repository
Create your feature branch (
git checkout -b feature/amazing-feature)Commit your changes (
git commit -m 'Add some amazing feature')Push to the branch (
git push origin feature/amazing-feature)Open a Pull Request
License
This project is licensed under the MIT License - see the LICENSE file for details.
hybrid server
The server is able to function both locally and remotely, depending on the configuration or use case.
Facilitates LLMs to efficiently access and fetch structured documentation for packages in Go, Python, and NPM, enhancing software development with multi-language support and performance optimization.
Related Resources
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- AsecurityAlicenseAqualityFetches up-to-date, version-specific documentation and code examples from the source and adds them to your LLM prompts, helping eliminate outdated code generations and hallucinated APIs.
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