Security MCP Server

# Plan: Project Architecture Document (PAD) Creation ## 1. Objective The primary goal is to create a comprehensive **Project Architecture Document (PAD)** that serves as the single source of truth for developers. This document will provide a deep dive into the system's architecture, components, and logic flows, enabling a new developer to get up to speed with the project quickly and efficiently. ## 2. Audience The target audience is a new developer joining the project. The document should assume they have general software engineering knowledge but are unfamiliar with this specific codebase. ## 3. PAD Outline & Content Strategy The `Project_Architecture_Document.md` will be structured into the following sections. ### Section 1: Introduction - **Content:** A high-level summary of the project's purpose: to provide secure, monitored access to network security tools for AI agents via the Model Context Protocol (MCP). - **Strategy:** I will synthesize this from the "Overview" section of the `README.md` and my own understanding. ### Section 2: System Architecture - **Content:** A Mermaid diagram illustrating the high-level components and their interactions (e.g., MCP Server, Tool Registry, Health Manager, Metrics Manager, Circuit Breaker, Tools). - **Strategy:** I will adapt the architecture diagram from the `README.md` to ensure it accurately reflects the codebase I have reviewed, adding detail where necessary. ### Section 3: File Hierarchy & Key Components - **Content:** 1. A tree-like representation of the project's file structure, generated from the provided file list. 2. A detailed breakdown of the most critical files/modules, explaining their responsibilities. - **Strategy:** - I will format the provided file list into a clear, hierarchical structure. - For the key components, I will write a detailed description for each of the following, explaining its role and significance: - `mcp_server/server.py`: The application's core request handler and orchestrator. - `mcp_server/base_tool.py`: The security foundation for all tools. - `mcp_server/tools/`: The extensible tool module system. - `mcp_server/config.py`: The configuration management system. - `mcp_server/health.py`: The health monitoring engine. - `mcp_server/metrics.py`: The observability and metrics collection system. - `mcp_server/circuit_breaker.py`: The resilience pattern implementation. - `Dockerfile` & `docker-compose.yml`: The deployment and containerization strategy. ### Section 4: Execution Flow Diagrams - **Content:** Two Mermaid diagrams to visualize the application's logic. 1. **User Interaction Flow (Sequence Diagram):** Shows the sequence of events from an AI agent's request to the final response, illustrating the interaction between the MCP Server, Tool Registry, Circuit Breaker, and a specific Tool. 2. **Application Logic Flow (Flowchart):** A more detailed flowchart that visualizes the internal logic of the `MCPBaseTool.run()` method, including input validation, security checks, concurrency control (semaphore), circuit breaker checks, command execution, and metrics recording. - **Strategy:** I will meticulously design these diagrams to be accurate representations of the code's execution path. ### Section 5: Core Concepts Deep Dive - **Content:** Dedicated sections explaining the key architectural concepts. 1. **Security Model:** Detail the "defense in depth" strategy, covering network restrictions, input validation (whitelisting), script filtering, and policy-gated intrusive operations. 2. **Observability:** Explain how health checks and Prometheus metrics work together to provide a complete picture of the system's status. 3. **Configuration:** Describe the multi-source configuration system and the priority order (Env > File > Defaults). 4. **Extensibility:** Provide a concise, step-by-step guide on how a developer would create and add a new, safe tool to the system. - **Strategy:** I will write clear, concise explanations for each concept, using examples from the code to illustrate the points. ## 4. Execution Checklist - [ ] **Phase 1: Initial Documentation** - [x] Create `Codebase_Review_and_my_Understanding.md`. - [x] Create and save this plan as `docs/PAD_Creation_Plan.md`. - [ ] **Phase 2: PAD Generation** - [ ] Create the main `Project_Architecture_Document.md` file. - [ ] Write the **Introduction** section. - [ ] Create the **System Architecture** Mermaid diagram. - [ ] Generate the **File Hierarchy** from the provided list. - [ ] Write the detailed descriptions for all **Key Components**. - [ ] Create the **User Interaction Flow** Mermaid sequence diagram. - [ ] Create the **Application Logic Flow** Mermaid flowchart. - [ ] Write the **Security Model** deep dive section. - [ ] Write the **Observability** deep dive section. - [ ] Write the **Configuration** deep dive section. - [ ] Write the **Extensibility** guide. - [ ] **Phase 3: Review and Finalize** - [ ] Review the entire PAD for clarity, accuracy, and completeness. - [ ] Validate that all requirements from the user's prompt have been met. - [ ] Ensure the document is well-formatted and easy to read. - [ ] Mark all checklist items as complete.