09 · Architecture Patterns Reference

graph TD
    A[JIRA Webhook] --> B[Agent Service · FastAPI]
    B --> C[LangGraph Workflow]

    subgraph Orchestration
        C --> D[Ticket Reader Node]
        D --> E[Service Identifier Node]
        E --> F[Code Retrieval Node · RAG]
        F --> G[Analysis Node · ReAct]
        G --> H[Code Generator Node]
        H --> I[Test Writer Node]
        I --> J[Validator Node · build + lint]
        J --> K[INTERRUPT: Human Review]
        K --> L[PR Creator Node]
    end

    subgraph Tools
        M[JIRA MCP Server]
        N[GitHub MCP Server]
        O[Vector DB · pgvector]
        P[Build Sandbox · Docker]
    end

    D --> M
    F --> O
    H --> P
    L --> N

graph LR
    subgraph External
        A[JIRA API]
        B[GitHub API]
        C[LLM API · Anthropic]
    end

    subgraph Agent Platform
        D[Input Guardrail]
        E[LangGraph State Machine]
        F[Output Guardrail]
        G[PostgreSQL · state + checkpoints]
        H[pgvector · code embeddings]
    end

    A --> D --> E
    E --> C
    C --> E
    E --> H
    E --> G
    E --> F --> B