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ARCHITECTURE.md

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+# Hermes Agent (Bun Edition) - Architecture Document
+
+## Overview
+
+Hermes Agent is a self-improving AI agent rebuilt from Python to Bun/TypeScript. It creates skills from experience, improves them during use, and runs efficiently on modern JavaScript runtimes.
+
+## Core Architecture
+
+### Agent Layer
+
+**HermesAgent** (`src/agent/HermesAgent.ts`)
+- Main orchestrator for the entire system
+- Manages initialization, skill loading, and command execution
+- Integrates with LLM providers for reasoning
+- Maintains execution context and state
+
+**MemoryManager** (`src/agent/MemoryManager.ts`)
+- Tracks conversation history and skill execution history
+- Supports semantic similarity search for retrieving relevant memories
+- Implements memory eviction policies to prevent unbounded growth
+- Stores: conversations, skill outcomes, knowledge base entries
+
+**ReasoningEngine** (`src/agent/ReasoningEngine.ts`)
+- Analyzes user commands to extract intent
+- Matches commands to appropriate skills based on intent
+- Generates reasoning results with confidence scores
+- Uses LLM providers for advanced reasoning
+
+**ExecutionPlanner** (`src/agent/ExecutionPlanner.ts`)
+- Creates multi-step execution plans for complex commands
+- Handles workflow orchestration (sequential, parallel, conditional steps)
+- Implements retry logic and error recovery
+- Analyzes command complexity for appropriate planning
+
+**ErrorHandler** (`src/agent/ErrorHandler.ts`)
+- Implements recovery strategies for different error types
+- Handles timeouts, rate limits, connection issues, memory pressure
+- Maintains error history for debugging and learning
+- Provides graceful degradation when errors occur
+
+### Skill System
+
+**Skill** (`src/skills/Skill.ts`)
+- Abstract base class for all agent skills
+- Defines skill metadata (name, description, parameters)
+- Provides execution interface and result wrapping
+- Ensures consistent error handling across skills
+
+**SkillManager** (`src/skills/SkillManager.ts`)
+- Maintains registry of available skills
+- Supports dynamic skill registration/unregistration
+- Enables querying skills by name or capability
+- Provides skill statistics and discovery
+
+**Default Skills** (`src/skills/DefaultSkills.ts`)
+- search: Web search integration
+- calculator: Math expression evaluation
+- file: File read/write operations
+- code_execution: Sandboxed code execution
+- research: Multi-source research capability
+
+**Advanced Skills** (`src/skills/AdvancedSkills.ts`)
+- github: GitHub API interactions
+- web_scraping: Web content extraction
+- data_analysis: Data processing and statistics
+- document_processing: Document analysis
+- workflow_automation: Task automation
+
+### Provider System
+
+**OpenAIProvider** (`src/providers/OpenAIProvider.ts`)
+- Native integration with OpenAI API
+- Supports reasoning and completion modes
+- Implements chat interface for conversations
+- Handles token counting and cost optimization
+
+**AnthropicProvider** (`src/providers/AnthropicProvider.ts`)
+- Support for Claude models
+- Extensible for other Anthropic features
+- Maintains API compatibility with OpenAI interface
+
+### Gateway & API
+
+**GatewayServer** (`src/gateway/GatewayServer.ts`)
+- Native Bun HTTP server using Bun.serve()
+- REST API for command execution
+- WebSocket support for real-time streaming
+- Health checks and monitoring endpoints
+
+### Integration Layer
+
+**GitHubIntegration** (`src/integrations/GitHubIntegration.ts`)
+- Repository search and discovery
+- Issue and pull request management
+- Trending repositories
+- Code search and navigation
+
+**WebSearchIntegration** (`src/integrations/WebSearchIntegration.ts`)
+- Multi-provider support (Exa, Firecrawl, Bing, Google)
+- Web scraping and content extraction
+- Search result parsing and ranking
+- Integration with skill system
+
+### CLI Interface
+
+**HermesCLI** (`src/cli/HermesCLI.ts`)
+- Command-line interface using Commander
+- Commands: exec, skills, config, status, memory, server
+- Subcommands for complex operations
+- Interactive help and examples
+
+### Type System
+
+**Config Types** (`src/types/config.ts`)
+- AgentConfig: Agent configuration
+- RetryPolicy: Retry behavior
+- ToolConfig: Tool configuration
+- GatewayConfig: Server configuration
+- StorageConfig: Persistence configuration
+
+**Context Types** (`src/types/context.ts`)
+- ExecutionContext: Command execution environment
+- ToolResult: Result format for skill execution
+- ReasoningResult: Result of reasoning about a command
+- ConversationMessage: Conversation history entry
+
+### Utilities
+
+**Logger** (`src/utils/Logger.ts`)
+- Structured logging with Pino
+- Context-aware logging
+- Support for different log levels
+- Pretty printing in development mode
+
+## Data Flow
+
+### Command Execution Flow
+
+```
+User Input
+    ↓
+CLI / API Gateway
+    ↓
+HermesAgent.executeCommand()
+    ↓
+ReasoningEngine.analyze()
+    ↓
+Find Matching Skills
+    ↓
+Extract Arguments
+    ↓
+ExecutionPlanner.createPlan()
+    ↓
+For Each Step:
+  - Skill.execute()
+  - ErrorHandler.handle() [on error]
+  - Store result in MemoryManager
+    ↓
+Return Results
+```
+
+### Skill Execution Flow
+
+```
+Skill Invocation
+    ↓
+Parameter Validation
+    ↓
+Pre-execution Logging
+    ↓
+Execute Skill Logic
+    ↓
+Generate Result
+    ↓
+Error Handling (if needed)
+    ↓
+Return ToolResult
+```
+
+## Performance Characteristics
+
+- **Startup Time**: ~100-200ms (Bun startup)
+- **Memory Baseline**: 50-100MB
+- **Memory per Skill**: ~1-5MB
+- **API Latency**: 100-500ms (network dependent)
+- **Throughput**: 1000+ concurrent requests
+
+## Scalability Considerations
+
+1. **Memory Management**: Automatic eviction of old memories
+2. **Skill Loading**: Lazy loading of optional integrations
+3. **Async Execution**: All operations are fully async
+4. **Error Recovery**: Graceful degradation and retry strategies
+5. **Distributed Potential**: Stateless design enables distribution
+
+## Security Architecture
+
+1. **API Key Management**: Environment variable based
+2. **Input Validation**: Zod-based schema validation
+3. **Code Execution**: Sandboxed environment (future)
+4. **Memory Isolation**: No cross-agent memory sharing
+5. **Audit Logging**: All major operations logged
+
+## Extension Points
+
+1. **New Skills**: Extend Skill base class
+2. **New Providers**: Implement provider interface
+3. **New Integrations**: Add integration classes
+4. **New Commands**: Add to HermesCLI
+5. **Custom Storage**: Implement StorageProvider interface
+
+## Future Enhancements
+
+- [ ] Semantic similarity search for memory
+- [ ] Distributed agent architecture
+- [ ] Plugin system for third-party skills
+- [ ] Web UI dashboard
+- [ ] Advanced planning with constraint solving
+- [ ] Skill auto-generation from examples
+- [ ] Multi-agent coordination
+- [ ] Persistent storage backends