augmnt/augments-mcp-server

A next-generation framework documentation provider for Claude Code via Model Context Protocol (MCP). Returns types + prose + examples with context-aware formatting for any npm package — not just curated ones.

mcp-name: dev.augments/mcp

What's New in v7

Version 7.0 is the biggest upgrade yet — documentation-first search, 4 new tools, BM25 indexing, and production-grade reliability.

v6	v7
3 tools	8 tools (+ diagnostics)
Types-only search	Documentation-first BM25 search
8 concept synonyms	25 concept synonym clusters
Generic version diffs	Real changelog-backed breaking changes
No migration guides	Cross-version migration guides
No error diagnosis	Curated error patterns + GitHub Issues
No package comparison	Side-by-side package comparison
No dep scanning	Dependency scanner (outdated/deprecated/security)
FIFO caches	LRU caches with hit/miss stats
Fixed retry delays	Exponential backoff + circuit breaker

Quick Start

Claude Code

# Add the MCP server (runs locally via npx)
claude mcp add -s user augments -- npx -y @augmnt-sh/augments-mcp-server

# Verify configuration
claude mcp list

Cursor

Add to your MCP config:

{
  "mcpServers": {
    "augments": {
      "command": "npx",
      "args": ["-y", "@augmnt-sh/augments-mcp-server"]
    }
  }
}

Environment Variables

Set GITHUB_TOKEN for higher GitHub API rate limits when fetching examples and documentation:

{
  "mcpServers": {
    "augments": {
      "command": "npx",
      "args": ["-y", "@augmnt-sh/augments-mcp-server"],
      "env": {
        "GITHUB_TOKEN": "ghp_your_token_here"
      }
    }
  }
}

Usage

# Get API context with prose + examples (recommended first tool)
@augments get_api_context query="useEffect cleanup" framework="react"

# Natural language queries work great
@augments get_api_context query="how to use zustand middleware"

# Search for APIs by concept (synonym-aware)
@augments search_apis query="state management"

# Get version info with real breaking changes
@augments get_version_info framework="react" fromVersion="18" toVersion="19"

# Migration guide between versions
@augments get_migration_guide package="next" fromVersion="14" toVersion="15"

# Diagnose an error
@augments diagnose_error error="Objects are not valid as a React child" package="react"

# Compare packages side-by-side
@augments compare_packages packages=["zod", "yup", "joi"]

# Scan project dependencies
@augments scan_project_deps

Tools

Tool	Description
get_api_context	Primary tool. Returns API signatures, prose documentation, and code examples for any npm package. Handles natural language queries with intent detection. Now with documentation-first BM25 search.
search_apis	Search for APIs across frameworks by keyword or concept. 25 synonym clusters ("state" matches useState, createStore, atom, etc).
get_version_info	Get npm version info, compare versions, and detect breaking changes backed by real changelogs.
get_migration_guide	New. Cross-version migration guide with breaking changes, new features, deprecations, type diffs, and official migration docs.
diagnose_error	New. Diagnose errors using curated patterns, GitHub Issues search, and troubleshooting docs.
compare_packages	New. Compare 2-5 npm packages: downloads, bundle size, GitHub stars, dependencies, exported APIs.
scan_project_deps	New. Scan package.json for outdated, deprecated, and insecure dependencies.
diagnostics	Server health: version, uptime, memory, cache stats, Node.js version.

Architecture

flowchart TD
    A["Query: 'how to use useEffect cleanup'"] --> B

    B["Intent Detection → howto<br/>Query Parser → react / useEffect"]

    B --> C["Type Fetcher<br/>CDN racing · npm metadata · @types"]
    B --> D["Doc Fetcher<br/>GitHub API · BM25 search · 25 synonym clusters"]
    B --> E["Example Extractor<br/>GitHub docs · README fallback · Auto-discovery"]

    C --> F["Type Parser<br/>Signatures · Parameters · Related types"]
    D --> G["Doc Search Engine<br/>BM25 indexing · Heading-based chunks · API boost"]

    F --> H["Intent-Driven Formatter (howto)<br/>→ Examples first, prose, brief signature<br/>→ ~500-2000 tokens, 10KB max"]
    G --> H
    E --> H

Source Structure

src/
├── cli.ts                   # stdio entry point
├── server.ts                # MCP server (8 tools + diagnostics)
├── core/                    # Core modules
│   ├── query-parser.ts      # Parse natural language → framework + concept
│   ├── type-fetcher.ts      # Fetch .d.ts + README from npm/unpkg/jsdelivr
│   ├── type-parser.ts       # Parse TypeScript, extract signatures, synonym search
│   ├── example-extractor.ts # Fetch examples from GitHub docs + auto-discovery
│   ├── version-registry.ts  # npm registry integration + changelog-backed diffs
│   ├── doc-fetcher.ts       # GitHub documentation fetcher
│   ├── doc-search.ts        # BM25 inverted index search engine
│   ├── changelog-fetcher.ts # CHANGELOG.md + GitHub Releases parser
│   ├── type-differ.ts       # .d.ts diff between versions
│   └── error-patterns.ts    # Curated error pattern database
├── tools/v4/                # MCP tools
│   ├── get-api-context.ts   # Primary tool (types + docs + examples)
│   ├── search-apis.ts       # Cross-framework API search
│   ├── get-version-info.ts  # Version comparison
│   ├── get-migration-guide.ts # Cross-version migration guides
│   ├── diagnose-error.ts    # Error diagnosis
│   ├── compare-packages.ts  # Package comparison
│   └── scan-project-deps.ts # Dependency scanner
└── utils/
    ├── logger.ts            # stderr logger
    └── lru-cache.ts         # Generic LRU cache with stats

Key Features

Documentation-First Search (New in v7)

Queries like "prisma findMany with pagination" and "zustand create store with middleware" now return real documentation content. The BM25 search engine indexes docs fetched from GitHub by heading-based chunks, with API name boosting and synonym expansion.

Concept Synonyms

25 synonym clusters cover state, form, fetch, animation, routing, auth, cache, effect, middleware, pagination, validation, testing, streaming, error handling, database, layout, modal, table, upload, realtime, deployment, i18n, SSR, component, and context patterns. Bidirectional lookup means "usestate" expands to the "state" cluster.

Intent-Aware Formatting

Intent	Trigger	Format
howto	"how to", "example of", "guide"	Examples → prose → brief signature
reference	"signature", "types", "parameters"	Full signature → related types → 1 example
migration	"migrate", "upgrade", "breaking"	Prose → signature → examples
balanced	Default	Signature → prose → examples

Production Reliability (New in v7)

• Exponential backoff with jitter for npm registry retries, with 429 Retry-After support
• CDN circuit breaker — skips repeatedly failing CDN endpoints (3 failures / 5 min)
• GitHub rate limiting — tracks remaining quota, skips fetches when exhausted
• LRU caches with hit/miss statistics across all cache-using modules

Coverage

Any npm Package

Every npm package is supported out of the box — no curation or configuration needed. Augments resolves documentation automatically through four layers:

1. Documentation search — fetches real docs from GitHub repos, indexes with BM25
2. TypeScript types — bundled ("types" in package.json) or DefinitelyTyped (@types/*)
3. Auto-discovered docs — parses the npm repository field, finds the GitHub repo, probes docs/ directories
4. README fallback — extracts concept-relevant code blocks and prose from README.md

This means augments works with the entire npm ecosystem (~2.5M packages), not just a curated subset.

Enhanced Results for Popular Frameworks

22 frameworks have curated doc sources for richer examples: React, Next.js, Vue, Prisma, Zod, Supabase, TanStack Query, tRPC, React Hook Form, Framer Motion, Express, Zustand, Jotai, Drizzle, SWR, Vitest, Playwright, Fastify, Hono, Solid, Svelte, Angular, Redux

Barrel Export Handling

Special sub-module resolution for: React Hook Form, TanStack Query, Zustand, Jotai, tRPC, Drizzle ORM, Next.js

Local Development

# Clone and install
git clone https://github.com/augmentscode/augments-mcp-server.git
cd augments-mcp-server
npm install

# Build with tsup
npm run build

# Run locally
npm start

# Watch mode
npm run dev

# Run tests
npm test

# Run e2e tests (real network calls)
npm run test:e2e

# Type check
npm run type-check

How Augments Compares to Context7

Aspect	Context7	Augments v7
Source	Parsed prose docs	Types + BM25-indexed docs + README
Accuracy	Docs can be wrong	Types must be correct, docs supplement
Context size	~5-10KB chunks	~500-2000 tokens (intent-aware)
Coverage	Manual submission	Any npm package (auto-discovery)
Format	One-size-fits-all	Intent-aware (how-to vs reference)
Search	Keyword match	BM25 + 25 concept synonym clusters
Freshness	Crawl schedule	On-demand from npm + GitHub
Migration	No	Cross-version migration guides
Error help	No	Curated patterns + GitHub Issues
Dep scanning	No	Outdated/deprecated/security checks

Contributing

1. Fork the repository
2. Create a feature branch: git checkout -b feature/amazing-feature
3. Make your changes
4. Run tests: npm test
5. Submit a pull request

License

MIT License - see LICENSE for details.

Support

• GitHub Issues
• GitHub Discussions

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Built for the Claude Code ecosystem | Version 7.0.0