mcp-api-reference
Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type
@followed by the MCP server name and your instructions, e.g., "@mcp-api-referencesearch docs for kintone: create record"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
mcp-api-reference
An MCP (Model Context Protocol) server that automatically crawls, indexes, and serves API reference documentation for LLMs.
Problem & Solution
When LLMs generate code that uses APIs, the following problems occur:
Hallucination: Generating non-existent endpoints or parameters
Stale information: Unable to reference the latest API specs not included in training data
Inefficient context consumption: Passing entire documentation wastes tokens
This tool automatically crawls, parses, and indexes API reference sites just by specifying a URL, then provides token-efficient search results via MCP tools.
Related MCP server: API Docs MCP Server
MCP Tools
Tool | Description | Main Inputs |
| Full-text search by keyword |
|
| Get details of a specific endpoint |
|
| List available APIs and categories |
|
Requirements
Node.js >= 18.0.0
Installation
npm install
npm run buildUsage
Start as MCP Server
node dist/index.jsCLI Options
# Specify a custom config file
node dist/index.js --config ./my-sites.json
# Refresh cache for a specific API
node dist/index.js --refresh kintone
# Clear all cache
node dist/index.js --clear-cacheOption | Short | Description |
|
| Path to custom site config file |
|
| Re-fetch documentation for the specified API |
| - | Clear all cache and exit |
Claude Desktop Integration
Add the following to claude_desktop_config.json:
{
"mcpServers": {
"api-reference": {
"command": "node",
"args": ["/path/to/mcp-reference-doc/dist/index.js"]
}
}
}Presets
kintone REST API
A parser for the kintone REST API is built in as a preset. No additional configuration required.
Backlog API
A parser for the Backlog API is also available as a preset. No additional configuration required.
SmartHR API
A parser for the SmartHR API is also available as a preset. No additional configuration required.
Custom Sites
You can add any API documentation site by specifying a JSON file with the --config option.
{
"sites": [
{
"id": "my-api",
"name": "My API",
"baseUrl": "https://api.example.com",
"crawl": {
"startUrl": "https://api.example.com/docs",
"includePatterns": ["https://api.example.com/docs/**"],
"excludePatterns": [],
"maxPages": 500,
"delayMs": 500
},
"parser": {
"type": "generic",
"selectors": {
"endpointContainer": ".endpoint",
"method": ".http-method",
"path": ".api-path",
"title": "h3",
"description": ".description",
"parameters": ".parameters",
"responseFields": ".response"
}
}
}
]
}Project Structure
src/
├── index.ts # CLI entry point
├── server.ts # MCP server initialization and tool registration
├── core/
│ ├── crawler.ts # Web crawler with robots.txt support
│ ├── parser.ts # Parser registry
│ ├── generic-parser.ts # Generic HTML parser (CSS selector-based)
│ ├── indexer.ts # Full-text search index via MiniSearch
│ ├── store.ts # Document store
│ ├── cache.ts # TTL-based cache management
│ └── pipeline.ts # Crawl → parse → index pipeline
├── tools/
│ ├── search-docs.ts # search_docs tool
│ ├── get-endpoint.ts # get_endpoint tool
│ └── list-apis.ts # list_apis tool
├── presets/
│ ├── kintone/ # kintone preset
│ ├── backlog/ # Backlog preset
│ └── smarthr/ # SmartHR preset
├── formatters/
│ └── response.ts # MCP response formatter
├── types/ # Type definitions
└── utils/ # Utilities (logger, glob, hash)Development
# Build in watch mode
npm run dev
# Run tests
npm test
# Run tests (watch mode)
npm run test:watch
# Type check
npm run typecheck
# Lint
npm run lintTech Stack
@modelcontextprotocol/sdk - MCP server implementation
cheerio - HTML parser
minisearch - Full-text search engine (with Japanese tokenization support)
zod - Schema validation
tsup - TypeScript bundler
vitest - Test framework
Environment Variables
Variable | Description | Default |
| Path to cache directory |
|
| Path to site config file | - |
License
MIT
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