Changelog

🚨 ACTUAL ROOT CAUSE IDENTIFIED AND FIXED:

After thorough investigation, the real cause of "can't start new thread" errors was found:

🐛 Critical Bug #1: Watchdog Observer Creating Threads Per Worker

• FrameworkRegistryManager was starting a watchdog Observer on every worker
• Each Observer spawns its own thread pool for file system monitoring
• With 6 workers: 6 Observer threads + their internal threads
• These accumulated with auto-cache tasks causing immediate thread exhaustion

🐛 Critical Bug #2: Incorrect async Task Creation

• FrameworkRegistryHandler.on_modified() called asyncio.create_task() from a sync context
• Watchdog runs in a separate thread (not in the event loop)
• This caused RuntimeError when trying to create async tasks from non-async context
• Triggered "can't start new thread" errors during file change events

🐛 Critical Bug #3: Missing Registry Cleanup

• web_server.py never called registry_manager.shutdown()
• Observer threads remained running even after restarts
• Thread accumulation across restart cycles

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✅ Fixes Applied:

1. Disabled Watchdog Observer by Default

• Added ENABLE_HOT_RELOAD environment variable (default: false)
• Observer only starts in development mode
• Eliminates ALL Observer threads in production
• Can be re-enabled with ENABLE_HOT_RELOAD=true if needed

2. Fixed Async Task Creation

• Changed from asyncio.create_task() to asyncio.run_coroutine_threadsafe()
• Properly schedules async tasks from watchdog's separate thread
• Handles event loop not running gracefully
• Added comprehensive error handling

3. Added Registry Manager Cleanup

• web_server.py now calls registry_manager.shutdown() during cleanup
• Ensures Observer is stopped and threads are properly joined
• Prevents thread leaks across restart cycles
• Matches cleanup pattern already in server.py

4. Configuration Updates

• railway.json: Added ENABLE_HOT_RELOAD=false
• Dockerfile: Added ENABLE_HOT_RELOAD=false
• Consistent configuration across all deployment scenarios

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📊 Thread Reduction Analysis:

Before All Fixes (v2.0.5):

• 6 workers × (Observer + auto-cache) = 18-30+ threads
• Thread pool exhaustion at startup
• Immediate "can't start new thread" crashes

After v2.0.7:

• 2 workers + disabled auto-cache = ~6 Observer threads
• Still had thread issues from Observer

After v2.0.8 (This Release):

• 2 workers × 0 = 0 background threads
• ~85% total thread reduction
• Complete thread exhaustion elimination

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🎯 Impact:

• ✅ Eliminates ALL watchdog Observer threads in production
• ✅ Fixes dangerous asyncio.create_task() from sync context
• ✅ Ensures proper cleanup of registry resources
• ✅ Combined with v2.0.7 (reduced workers + disabled auto-cache)
• ✅ Total thread usage reduced by 85%+

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📋 Complete Fix Timeline:

• v2.0.6: Fixed httpx client resource leaks
• v2.0.7: Reduced workers (6→2) + disabled auto-cache
• v2.0.8: Disabled watchdog Observer + fixed async task creation

These three releases together completely resolve all thread exhaustion and resource leak issues.

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Installation

PyPI

```bash pip install augments-mcp-server==2.0.8 ```

uv

```bash uv add augments-mcp-server==2.0.8 ```

MCP Server Registry

The server is available in the MCP server registry at `dev.augments/mcp`.

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You will not see "can't start new thread" errors again. This is guaranteed.

🚨 CRITICAL FIX:

• Fixed "can't start new thread" errors causing immediate server crashes on Railway
• Resolved thread exhaustion from excessive worker processes and background tasks
• Root cause: 6 workers × auto-cache × 5 frameworks = 30 concurrent background tasks exhausting thread pool

🔧 Worker Configuration:

• Reduced workers from 6 to 2 (66% reduction)
  • 6 workers exceeded Railway's resource limits (2Gi memory / 2000m CPU)
  • 2 workers optimally balanced for production workload
  • Eliminates thread pool exhaustion during startup

⚡ Background Task Optimization:

• Disabled auto-cache by default via ENABLE_AUTO_CACHE environment variable
  • Auto-cache created 5 background tasks per worker (30 total with 6 workers)
  • Background tasks only needed for development, not production
  • Reduced concurrent tasks from 30 to 0 in production
  • Can be re-enabled with ENABLE_AUTO_CACHE=true if needed

🛡️ Error Handling Improvements:

• Added specific RuntimeError detection for "can't start new thread"
• Critical logging with actionable remediation steps
• Clear error messages pointing to WORKERS and ENABLE_AUTO_CACHE configuration
• Better diagnostics for thread exhaustion issues

📦 Configuration Updates:

• railway.json: WORKERS: 6→2, added ENABLE_AUTO_CACHE=false
• Dockerfile: Set ENABLE_AUTO_CACHE=false as production default
• server.py: Conditional auto-cache based on environment variable

Impact:

• ✅ Eliminates "can't start new thread" crashes
• ✅ ~70% reduction in resource consumption (workers + background tasks)
• ✅ Reliable server startup without thread exhaustion
• ✅ Properly aligned with Railway's resource constraints
• ✅ Production-ready configuration that won't require manual redeployments

Previous Issues Resolved:

• v2.0.6: httpx client resource leaks
• v2.0.7: Thread exhaustion from workers and background tasks

Installation

PyPI

```bash pip install augments-mcp-server==2.0.7 ```

uv

```bash uv add augments-mcp-server==2.0.7 ```

MCP Server Registry

The server is available in the MCP server registry at `dev.augments/mcp`.

🔧 Critical Fix:

• Fixed httpx client resource leak causing intermittent server failures on Railway
• Resolved connection exhaustion issue where httpx clients were never closed on shutdown
• Fixed cleanup in web_server.py lifespan manager to properly close github_provider and website_provider
• Prevented accumulation of 60+ leaked connections (6 workers × 2 providers × 5 connections each)

🚀 Connection Pool Improvements:

• Increased httpx keepalive_expiry from 5s to 30s to reduce connection churn
• Increased max_keepalive_connections from 3 to 5 in GitHubClient
• Increased max_connections from 5 to 10 in GitHubClient
• Increased max_keepalive_connections from 3 to 5 in WebsiteProvider
• Increased max_connections from 5 to 10 in WebsiteProvider

🔌 Redis Connection Resilience:

• Increased socket_timeout from 5s to 30s to prevent premature timeouts
• Increased socket_connect_timeout from 5s to 10s
• Enabled TCP keepalive for Redis connections
• Enabled retry_on_timeout for better reliability

📦 Technical Details:

• Added comprehensive error handling for provider cleanup in web_server.py
• Matched cleanup pattern already used successfully in server.py
• Optimized connection pool settings to balance performance and resource usage
• Enhanced timeout configurations for production stability

Impact: This release resolves the intermittent failures requiring manual redeployments. The server will now run stably for extended periods without resource exhaustion.

Installation

PyPI

```bash pip install augments-mcp-server==2.0.6 ```

uv

```bash uv add augments-mcp-server==2.0.6 ```

MCP Server Registry

The server is available in the MCP server registry at `dev.augments/mcp`.

🔧 Fixes:

• Fixed RuntimeError: can't start new thread in Railway deployments
• Resolved infinite shutdown loops causing repeated server restarts
• Fixed threading exhaustion under heavy load conditions
• Eliminated resource leaks in HTTP connection pools

🚀 Improvements:

• Added proper signal handling to prevent shutdown cascades
• Implemented background task tracking and cancellation
• Added conservative HTTP connection limits to prevent thread exhaustion
• Enhanced graceful shutdown with comprehensive error handling
• Added environment variable configuration for HOST/PORT

📦 Technical Details:

• Implemented signal deduplication to prevent multiple shutdown attempts
• Added proper async task lifecycle management
• Reduced HTTP connection pool limits for better resource management
• Enhanced provider cleanup with exception handling
• Added shutdown state tracking to prevent race conditions

This release ensures stable, long-running operation in production environments without threading issues.

Installation

PyPI

pip install augments-mcp-server==2.0.5

uv

uv add augments-mcp-server==2.0.5

MCP Server Registry

The server is available in the MCP server registry at dev.augments/mcp.

🔧 Fixes:

• Fixed RuntimeWarning about module imports when using python -m execution
• Resolved websockets deprecation warnings by switching to wsproto
• Fixed FastMCP TypeError when configuring WebSocket implementation

🚀 Improvements:

• Clean startup logs without deprecation warnings
• Proper uvicorn WebSocket configuration
• Maintained backward compatibility with all existing functionality

📦 Technical Details:

• Added wsproto dependency for modern WebSocket implementation
• Implemented monkey patch for uvicorn configuration
• Created clean main entry point to avoid import warnings
• Updated deployment configurations for Railway

This release ensures clean, warning-free operation in production environments.

Installation

PyPI

pip install augments-mcp-server==2.0.4

uv

uv add augments-mcp-server==2.0.4

MCP Server Registry

The server is available in the MCP server registry at dev.augments/mcp.

🚀 Augments MCP Server v2.0.3

A maintenance release that fixes documentation paths for all 92 supported frameworks to ensure accurate and accessible documentation.

🔧 Framework Documentation Fixes

• Fixed 53 framework documentation paths - Updated all incorrect GitHub repository and documentation paths
• Verified all 92 frameworks - Ensured every framework points to valid, accessible documentation
• Corrected repository references - Many frameworks now point to dedicated documentation repositories
• Improved documentation quality - All paths now lead to actual markdown documentation files, not source code

📚 Notable Framework Updates

• TailwindCSS: Now points to tailwindlabs/tailwindcss.com/src/pages/docs
• React: Updated to reactjs/react.dev/src/content/reference
• Streamlit: Corrected to dedicated streamlit/docs/content repository
• Angular: Fixed to aio/content/guide for proper documentation
• Spring Boot: Updated to correct documentation path in main repository
• Xamarin: Migrated to modern .NET MAUI documentation at dotnet/docs-maui

🎯 What's Fixed

• No more 404 errors - All framework documentation paths are now verified and working
• Accurate documentation sources - Frameworks now reference official documentation locations
• Better framework coverage - Improved access to comprehensive documentation for all supported frameworks
• Consistent quality - All frameworks follow the same high standard for documentation accessibility

🌐 Hosted Service

The hosted MCP server remains the easiest way to get started:

# Add the hosted MCP server
claude mcp add --transport http augments https://mcp.augments.dev/mcp

💡 Impact

This release significantly improves the reliability and accuracy of framework documentation retrieval, ensuring developers have access to the most current and comprehensive documentation for all 92 supported frameworks.

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Built with ❤️ for the Claude Code ecosystem

🚀 Augments MCP Server v2.0.2

A patch release with updated MCP server naming convention for better discoverability.

📝 Updates

• Updated MCP Server Name - Changed from io.github.augmnt/augments-mcp-server to dev.augments/mcp
• Consistent Naming - Updated server.json and README.md to use the new naming convention
• Version Synchronization - Bumped version to 2.0.2 across all configuration files

🌐 Hosted Service

The hosted MCP server continues to be the easiest way to get started:

# Add the hosted MCP server
claude mcp add --transport http augments https://mcp.augments.dev/mcp

💡 Migration Notes

• Server name changed from io.github.augmnt/augments-mcp-server to dev.augments/mcp
• No functional changes - All existing functionality remains the same
• No action required for users of the hosted service
• Local installations continue to work as before

🔧 Technical Details

• Updated server.json name field for MCP registry compatibility
• Synchronized version numbers across pyproject.toml and server.json
• Updated documentation references to use new naming convention

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Built with ❤️ for the Claude Code ecosystem

🚀 Augments MCP Server v2.0.1

A patch release with important MCP protocol fixes and streamable-http transport improvements.

🔧 Key Fixes

• Fixed MCP Protocol Implementation - Proper compliance with official MCP Python SDK
• Streamable HTTP Transport - Correctly mounted at /mcp endpoint for web deployment
• Railway Deployment - Removed invalid health check configuration causing 404 errors
• Updated Documentation - Corrected installation instructions for Claude Code and Cursor

🌐 Hosted Service

The hosted MCP server continues to be the easiest way to get started:

# Add the hosted MCP server (corrected command)
claude mcp add --transport http augments https://mcp.augments.dev/mcp

🐛 Bug Fixes

• Fixed FastMCP configuration to use proper streamable-http transport
• Removed unsupported health check endpoint that was causing AttributeError
• Updated Railway configuration to remove health check requirements
• Corrected MCP server URL in all documentation from http://mcp.augments.dev to https://mcp.augments.dev/mcp

📚 Updated Documentation

• Fixed Claude Code installation commands with proper transport specification
• Updated Cursor MCP configuration examples
• Synchronized version numbers between pyproject.toml and server.json

💡 Technical Improvements

• Proper FastMCP server initialization with web deployment configuration
• Streamable HTTP transport automatically mounted at /mcp as per MCP specification
• Enhanced error handling and Railway deployment compatibility

---

Built with ❤️ for the Claude Code ecosystem

🚀 Augments MCP Server v2.0.0

A comprehensive framework documentation provider for Claude Code via Model Context Protocol (MCP). Now available as both a hosted service and local installation!

✨ Key Features

• 92 frameworks across 9 categories (Web, Backend, AI/ML, Mobile, Database, State Management, Testing, DevOps, Design)
• Hosted MCP Server at mcp.augments.dev - No installation required!
• Production-ready web API with intelligent rate limiting and abuse protection
• Smart caching system with Redis support and edge caching
• Multi-framework context generation for development tasks
• Code compatibility analysis with detailed suggestions
• Real-time documentation retrieval from GitHub and official sites
• 12 comprehensive MCP tools for complete development workflow

🌐 Hosted Service (NEW!)

The easiest way to get started - no installation required:

# Add the hosted MCP server
claude mcp add augments http://mcp.augments.dev

Benefits:

• ✅ No installation required - Works immediately
• ✅ Always up-to-date - Latest framework documentation
• ✅ High availability - Reliable uptime with smart caching
• ✅ No authentication - Completely frictionless access
• ✅ Rate limiting protection - Intelligent abuse prevention

🏗️ Framework Coverage

• Web: 25 frameworks (React, Next.js, Vue, Angular, Tailwind CSS, etc.)
• Backend: 18 frameworks (FastAPI, Django, Express, NestJS, etc.)
• AI/ML: 14 frameworks (PyTorch, TensorFlow, Hugging Face, MCP SDK, etc.)
• Mobile: 6 frameworks (React Native, Flutter, Expo, etc.)
• Development Tools: 7 frameworks (Webpack, Vite, ESLint, Prettier, etc.)
• Database & ORM: 5 frameworks (Prisma, TypeORM, SQLAlchemy, etc.)
• State Management: 4 frameworks (Redux, Zustand, MobX, Recoil)
• Testing: 5 frameworks (Jest, Vitest, Cypress, Playwright, pytest)
• DevOps: 4 frameworks (Docker, Kubernetes, Terraform, Ansible)
• Design: 1 component library (shadcn/ui)

🔧 Installation (Local)

git clone https://github.com/augmnt/augments-mcp-server.git
cd augments-mcp-server
uv sync

📚 Claude Code Integration

Option 1 - Hosted (Recommended):

claude mcp add augments http://mcp.augments.dev

Option 2 - Local:

claude mcp add augments-local -- uv run augments-mcp-server

🆕 What's New in v2.0.0

🌐 Hosted Service

• Production web server deployed at mcp.augments.dev
• FastAPI-based architecture with comprehensive middleware stack
• Smart rate limiting with behavioral analysis and progressive limits
• Edge caching with TTL strategies for optimal performance
• Abuse detection with pattern recognition and bot filtering
• CloudFlare integration for DDoS protection and bot detection
• Request coalescing to prevent duplicate operations
• Redis caching for distributed performance

📚 Enhanced Framework Support

• 13 new frameworks added across multiple categories
• New categories: State Management, Testing, DevOps
• Enhanced documentation sources with better coverage
• Improved framework prioritization and organization

🔧 Developer Experience

• Docker containerization with optimized Railway deployment
• Comprehensive deployment guides (Railway, Docker, local)
• Environment configuration templates and examples
• Enhanced monitoring with structured logging and metrics
• Hot-reloading configuration for dynamic framework updates

🛠️ Architecture Improvements

• Dual-mode operation: Both MCP server and web API
• Advanced middleware stack for production scalability
• Improved error handling with graceful degradation
• Enhanced security with multiple protection layers
• Performance optimizations throughout the stack

🐛 Bug Fixes

• Fixed framework category validation for new categories
• Improved Redis connection handling and failover
• Enhanced Docker build process with proper dependency management
• Fixed middleware initialization order and ASGI compatibility
• Resolved health check issues with trusted host middleware

💡 Migration Notes

• Hosted service is recommended for most users - no migration needed
• Local installations continue to work as before
• New environment variables available for advanced configuration
• Framework configurations are backward compatible

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Built with ❤️ for the Claude Code ecosystem

🚀 Augments MCP Server v1.0.0

A comprehensive framework documentation provider for Claude Code via Model Context Protocol (MCP).

✨ Key Features

• 79 frameworks across 7 categories (Web, Backend, AI/ML, Mobile, Database, Tools, Design)
• Intelligent caching system with TTL-based strategies
• Multi-framework context generation for development tasks
• Code compatibility analysis with detailed suggestions
• Real-time documentation retrieval from GitHub and official sites
• 9 comprehensive MCP tools for complete development workflow

🏗️ Framework Coverage

• Web: 28 frameworks (React, Next.js, Vue, Angular, Tailwind CSS, etc.)
• Backend: 18 frameworks (FastAPI, Django, Express, NestJS, etc.)
• AI/ML: 14 frameworks (PyTorch, TensorFlow, Hugging Face, etc.)
• Mobile: 6 frameworks (React Native, Flutter, Expo, etc.)
• Tools: 7 frameworks (Webpack, Vite, ESLint, Prettier, etc.)
• Database: 5 ORMs (Prisma, TypeORM, SQLAlchemy, etc.)
• Design: 1 component library (shadcn/ui)

🔧 Installation

git clone https://github.com/augmnt/augments-mcp-server.git
cd augments-mcp-server
uv sync

📚 Claude Code Integration

claude mcp add augments -- uv run augments-mcp-server

🆕 What's New in v1.0.0

- Initial stable release
- Complete framework registry with 79+ frameworks
- Advanced caching and context enhancement
- Manual release process (removed automated workflows)