14. Production AI Agent Architecture

flowchart TD
    USER["👤 User"] --> GATEWAY["🚪 API Gateway"]
    GATEWAY --> AUTH["🔐 Auth & Rate Limiting"]
    AUTH --> ROUTER["🔀 Router\n(Intent Classification)"]

    ROUTER --> PLAN["📋 Planner\n(Task Decomposition)"]
    PLAN --> QUEUE["📨 Task Queue"]

    QUEUE --> MEM["💾 Memory Layer"]
    QUEUE --> RETRIEVER["🔍 Retriever\n(Knowledge Base)"]
    QUEUE --> LLM["🧠 LLM Service"]
    QUEUE --> TOOLS["🛠️ Tool Registry"]

    TOOLS --> BROWSER["🌐 Browser"]
    TOOLS --> CODE["💻 Code Execution"]
    TOOLS --> FS["📁 File System"]
    TOOLS --> API["🔌 External APIs"]
    TOOLS --> DB["🗄️ Database"]

    TOOLS --> EXEC["⚡ Execution Engine"]
    EXEC --> OBS["👁️ Observer"]
    OBS --> REFLECT["🪞 Reflection"]
    REFLECT -->|"Continue"| PLAN
    REFLECT -->|"Done"| RESPONSE["✅ Response"]

    OBSERV["📊 Observability\n(Tracing, Logs, Metrics)"] -.-> ALL
    GUARD["🛡️ Guardrails\n(Safety, Validation)"] -.-> ALL

    style USER fill:#3b82f6,color:#fff
    style GATEWAY fill:#8b5cf6,color:#fff
    style PLAN fill:#f59e0b,color:#fff
    style LLM fill:#22c55e,color:#fff
    style EXEC fill:#ef4444,color:#fff
    style RESPONSE fill:#22c55e,color:#fff
    style OBSERV fill:#6366f1,color:#fff
    style GUARD fill:#ec4899,color:#fff

flowchart LR
    subgraph PRODUCTS["Real AI Agent Products"]
        CURSOR["Cursor\nCode Editor Agent"]
        DEVIN["Devin\nSoftware Engineer Agent"]
        OPERATOR["OpenAI Operator\nWeb Task Agent"]
        CLAUDE["Claude Desktop\nComputer Use Agent"]
    end

    PRODUCTS --> COMMON["Common Architecture Patterns"]

    style CURSOR fill:#3b82f6,color:#fff
    style DEVIN fill:#8b5cf6,color:#fff
    style OPERATOR fill:#f59e0b,color:#fff
    style CLAUDE fill:#22c55e,color:#fff
    style COMMON fill:#6366f1,color:#fff

flowchart TD
    USER_CODE["👤 User writes code"] --> AI["🤖 AI Engine"]
    AI --> CONTEXT["📄 Context Builder\n(Current file, imports, errors)"]
    CONTEXT --> INDEX["📑 Code Index\n(AST + Embeddings)"]
    INDEX --> LLM_CURSOR["🧠 LLM\n(Code completion)"]
    LLM_CURSOR --> SUGGEST["💡 Suggestion"]

    USER_CODE --> DIFF["🔍 Diff Detection"]
    DIFF --> ERRORS["❌ Error Detection"]
    ERRORS --> AI

    AI --> TERMINAL["💻 Terminal Execution"]
    TERMINAL --> OUTPUT["📊 Output Analysis"]
    OUTPUT --> AI

    style USER_CODE fill:#3b82f6,color:#fff
    style AI fill:#8b5cf6,color:#fff
    style LLM_CURSOR fill:#f59e0b,color:#fff
    style SUGGEST fill:#22c55e,color:#fff

flowchart TD
    GOAL["🎯 User Goal:\n'Build a web app'"] --> PLANNER_D["📋 Planner\n(High-level plan)"]
    PLANNER_D --> SHELL["💻 Shell Agent\n(Commands & scripts)"]
    PLANNER_D --> EDITOR["📝 Editor Agent\n(Code writing)"]
    PLANNER_D --> BROWSER_D["🌐 Browser Agent\n(Testing & debugging)"]
    PLANNER_D --> SEARCH["🔍 Search Agent\n(Research & docs)"]

    SHELL --> MEM_D["🧠 Memory\n(Project state)"]
    EDITOR --> MEM_D
    BROWSER_D --> MEM_D
    SEARCH --> MEM_D

    MEM_D --> REVIEW_D["📝 Reviewer\n(Code review)"]
    REVIEW_D -->|"Issues"| EDITOR
    REVIEW_D -->|"Approved"| DEPLOY["🚀 Deploy"]

    style GOAL fill:#3b82f6,color:#fff
    style PLANNER_D fill:#8b5cf6,color:#fff
    style MEM_D fill:#f59e0b,color:#fff
    style DEPLOY fill:#22c55e,color:#fff

flowchart LR
    subgraph OPERATOR_ARCH["OpenAI Operator"]
        O_USER["👤 User"] --> O_LLM["🧠 LLM"]
        O_LLM --> O_BROWSER["🌐 Browser Control"]
        O_BROWSER --> O_SS["📸 Screenshot Analysis"]
        O_SS --> O_ACT["🖱️ Click / Type / Navigate"]
        O_ACT --> O_CHECK["✅ Check Result"]
        O_CHECK -->|"Failed"| O_RETRY["🔄 Retry with different approach"]
        O_CHECK -->|"Success"| O_DONE["✅ Done"]
        O_HITL["👤 Human Approval\n(for purchases, logins)"] -.-> O_ACT
    end

    subgraph CLAUDE_ARCH["Claude Desktop"]
        C_USER["👤 User"] --> C_LLM["🧠 LLM"]
        C_LLM --> C_SCREEN["📸 Screen Capture"]
        C_SCREEN --> C_ANALYZE["👁️ Visual Analysis"]
        C_ANALYZE --> C_MOUSE["🖱️ Mouse Control"]
        C_ANALYZE --> C_KEYBOARD["⌨️ Keyboard Control"]
        C_MOUSE --> C_RESULT["📊 Check Result"]
        C_KEYBOARD --> C_RESULT
        C_RESULT -->|"Continue"| C_SCREEN
        C_RESULT -->|"Done"| C_DONE["✅ Task Complete"]
    end

    style OPERATOR_ARCH fill:#3b82f6,color:#fff
    style CLAUDE_ARCH fill:#22c55e,color:#fff

flowchart TD
    subgraph LAYERS["Production Agent Layers"]
        L1["🔹 Layer 1: Gateway\nAPI Gateway, Auth, Rate Limiting"]
        L2["🔹 Layer 2: Orchestration\nPlanner, Router, Task Queue"]
        L3["🔹 Layer 3: Intelligence\nLLM, Memory, Retrieval"]
        L4["🔹 Layer 4: Execution\nTool Registry, Execution Engine"]
        L5["🔹 Layer 5: Observability\nTracing, Logging, Monitoring"]
        L6["🔹 Layer 6: Safety\nGuardrails, Validation, Human-in-Loop"]
    end

    L1 --> L2 --> L3 --> L4
    L5 -.-> ALL
    L6 -.-> ALL

    style L1 fill:#3b82f6,color:#fff
    style L2 fill:#8b5cf6,color:#fff
    style L3 fill:#f59e0b,color:#fff
    style L4 fill:#22c55e,color:#fff
    style L5 fill:#ef4444,color:#fff
    style L6 fill:#ec4899,color:#fff

flowchart LR
    subgraph SCALING["Production Scaling Considerations"]
        S1["🎯 Horizontal Scaling\nStateless agents behind load balancer"]
        S2["💾 State Management\nRedis + PostgreSQL for persistence"]
        S3["⚡ Caching\nResponse cache + embedding cache"]
        S4["🔀 Queue-Based Processing\nAsync for long-running tasks"]
        S5["🌐 Multi-Model Routing\nCheap model for simple, expensive for complex"]
    end

    style S1 fill:#3b82f6,color:#fff
    style S2 fill:#8b5cf6,color:#fff
    style S3 fill:#f59e0b,color:#fff
    style S4 fill:#22c55e,color:#fff
    style S5 fill:#ef4444,color:#fff

flowchart TD
    subgraph SEC["Security Layers"]
        S1["🔐 Authentication\nJWT / OAuth / SSO"]
        S2["📋 Authorization\nRBAC + Scope-based permissions"]
        S3["🛡️ Prompt Protection\nInput sanitization\nInjection detection\nPII masking"]
        S4["🔒 Execution Isolation\nSandboxed tool execution\nDocker containers\nNo network for code exec"]
        S5["📝 Audit Logging\nEvery action logged\nImmutable logs\nFull traceability"]
    end

    S1 --> S2 --> S3 --> S4 --> S5

    style S1 fill:#3b82f6,color:#fff
    style S2 fill:#8b5cf6,color:#fff
    style S3 fill:#f59e0b,color:#fff
    style S4 fill:#ef4444,color:#fff
    style S5 fill:#22c55e,color:#fff