Architecture Overview¶

The SolidWorks MCP Server implements an intelligent, multi-layered architecture designed to overcome the limitations of traditional COM-based SolidWorks automation while providing enterprise-grade reliability and security.

High-Level Architecture¶

flowchart TB
    subgraph "Client Layer"
        Claude["Claude Desktop"]
        Custom["Custom Applications"]  
        Web["Web Interface"]
    end

    subgraph "MCP Protocol Layer"
        Transport["JSON-RPC Transport"]
        Protocol["MCP Protocol Handler"]
        Auth["Authentication & Security"]
    end

    subgraph "Application Layer"
        Router["Intelligent Router"]
        Tools["Tool Registry (90+)"]
        Cache["Response Cache"]
    end

    subgraph "Adapter Layer"
        Analyzer["Complexity Analyzer"]
        COM["Direct COM Adapter"]
        VBA["VBA Generator Adapter"]
        Breaker["Circuit Breaker"]
    end

    subgraph "SolidWorks Layer"
        SW["SolidWorks Application"]
        API["SolidWorks API"]
        Macros["VBA Execution Engine"]
    end

    Claude --> Transport
    Custom --> Transport
    Web --> Transport

    Transport --> Protocol
    Protocol --> Auth
    Auth --> Router

    Router --> Tools
    Router --> Cache
    Tools --> Analyzer

    Analyzer --> COM
    Analyzer --> VBA
    COM --> Breaker
    VBA --> Breaker

    Breaker --> SW
    COM --> API
    VBA --> Macros

Core Components¶

1. Intelligent Router¶

The core orchestrator that:

• Route Selection: Determines optimal execution path based on operation complexity
• Load Balancing: Distributes requests across available SolidWorks instances
• Fallback Management: Handles failures gracefully with automatic retry strategies
• Caching: Stores frequently accessed data to improve performance

2. Complexity Analyzer¶

Advanced analysis engine that examines operations to determine the best execution strategy:

Analysis Criteria¶

• Parameter Count: Operations with 13+ parameters typically require VBA
• Operation Type: Certain operations (sweeps, lofts) are VBA-preferred
• Data Complexity: Large datasets benefit from VBA batch processing
• Performance History: Past success/failure rates influence routing decisions

Decision Tree¶

flowchart TD
    A[Tool Request] --> B{Parameter Count}
    B -->|"≤12"| C{Operation Type}
    B -->|">12"| D[VBA Generator]

    C -->|Simple| E[Direct COM]
    C -->|Complex| F{Performance History}

    F -->|"Good COM History"| E
    F -->|"Poor COM History"| D

    E --> G{Success?}
    D --> H{Success?}

    G -->|Yes| I[Return Result]
    G -->|No| J[Circuit Breaker]

    H -->|Yes| I
    H -->|No| K[Error Handler]

    J --> L{Retry Count}
    L -->|"< Max"| D
    L -->|"= Max"| M[Report Failure]

3. Adapter Architecture¶

Dual-adapter system providing multiple execution paths:

Direct COM Adapter¶

• Speed: Fastest execution for simple operations
• Reliability: Direct API access with immediate feedback
• Limitations: Parameter count restrictions, complex operation failures
• Use Cases: Basic modeling, simple sketches, property queries

VBA Generator Adapter¶

• Flexibility: Handles any operation complexity
• Reliability: Robust handling of complex parameter sets
• Performance: Optimized batch operations
• Use Cases: Complex features, batch processing, advanced operations

4. Security Architecture¶

Multi-layered security system with configurable protection levels:

flowchart TB
    subgraph "Security Layers"
        Auth["Authentication Layer"]
        Authz["Authorization Layer"]  
        Tool["Tool Access Control"]
        File["File System Security"]
        VBA["VBA Execution Control"]
    end

    subgraph "Security Levels"
        Dev["Development (High Risk)"]
        Rest["Restricted (Medium Risk)"]
        Sec["Secure (Low Risk)"]
        Lock["Locked (Minimal Risk)"]
    end

    Request["Client Request"] --> Auth
    Auth --> Authz
    Authz --> Tool
    Tool --> File
    File --> VBA

    VBA --> Dev
    VBA --> Rest  
    VBA --> Sec
    VBA --> Lock

Security Level Matrix¶

5. Connection Management¶

Enterprise-grade connection handling:

Connection Pool¶

• Instance Reuse: Maintains pool of SolidWorks instances
• Load Distribution: Balances requests across instances
• Health Monitoring: Tracks instance health and performance
• Auto-scaling: Adds/removes instances based on demand

Circuit Breaker Pattern¶

stateDiagram-v2
    [*] --> Closed
    Closed --> Open : Failure threshold reached
    Open --> HalfOpen : Timeout elapsed
    HalfOpen --> Closed : Success
    HalfOpen --> Open : Failure

    note right of Closed : Normal operation
    note right of Open : Reject requests
    note right of HalfOpen : Test recovery

Performance Optimizations¶

Caching Strategy¶

Multi-Level Caching¶

1. Result Cache: Stores operation results for reuse
2. Feature Cache: Caches SolidWorks feature trees
3. Property Cache: Stores frequently accessed properties
4. Query Cache: Caches complex queries and analyses

Cache Invalidation¶

• Time-based: TTL expiration for dynamic data
• Event-based: Invalidation on model changes
• Manual: Explicit cache clearing commands

Asynchronous Operations¶

Non-blocking Design¶

• Async Tools: All tools support asynchronous execution
• Background Processing: Long operations run in background
• Progress Tracking: Real-time progress for lengthy operations
• Cancellation: Ability to cancel in-progress operations

Batch Processing¶

• Queue Management: Smart queueing of batch operations
• Resource Allocation: Optimal resource utilization
• Error Recovery: Robust handling of batch failures
• Progress Reporting: Detailed batch progress tracking

Error Handling¶

Comprehensive Error Strategy¶

Error Classification¶

1. Transient Errors: Network, temporary SolidWorks issues
2. Configuration Errors: Invalid parameters, missing files
3. System Errors: SolidWorks crashes, COM failures
4. Security Errors: Access denied, authentication failures

Recovery Mechanisms¶

• Automatic Retry: Configurable retry with exponential backoff
• Graceful Degradation: Fallback to simpler operations
• Health Checks: Proactive system health monitoring
• Alerting: Configurable error notification system

Monitoring and Observability¶

Comprehensive Logging¶

• Structured Logging: JSON-formatted logs for analysis
• Performance Metrics: Operation timing and resource usage
• Security Audit: Complete audit trail of all operations
• Health Metrics: System health and performance indicators

Metrics Collection¶

flowchart LR
    App["Application"] --> Metrics["Metrics Collector"]
    Metrics --> Store["Metrics Store"]
    Store --> Dash["Dashboard"]
    Store --> Alert["Alerting"]

    subgraph "Key Metrics"
        Perf["Performance"]
        Error["Error Rates"]  
        Usage["Tool Usage"]
        Health["Health Status"]
    end

Deployment Patterns¶

Local Development¶

• Single instance with mock SolidWorks for testing
• Full debugging and development tool access
• Hot reloading for rapid development

Enterprise Production¶

• Load-balanced multiple instances
• Database-backed caching and state management
• Comprehensive monitoring and alerting
• Security hardening and audit compliance

Cloud Deployment¶

• Containerized instances with orchestration
• Auto-scaling based on demand
• Distributed caching and state management
• Global load balancing and CDN integration