/langchain-agent

Create LangChain agent implementation

# LangChain/LangGraph Agent Scaffold

Create a production-ready LangChain/LangGraph agent for: $ARGUMENTS

Implement a complete agent system including:

1. **Agent Architecture**:
   - LangGraph state machine
   - Tool selection logic
   - Memory management
   - Context window optimization
   - Multi-agent coordination

2. **Tool Implementation**:
   - Custom tool creation
   - Tool validation
   - Error handling in tools
   - Tool composition
   - Async tool execution

3. **Memory Systems**:
   - Short-term memory
   - Long-term storage (vector DB)
   - Conversation summarization
   - Enti...