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Secure MCP (Model Context Protocol) Implementation for Script Language

Project Context

I have a comprehensive Script programming language implementation with:

  • Complete lexer, parser, and semantic analyzer
  • LSP server implementation (script-lsp)
  • Package manager (manuscript)
  • Documentation generator, testing framework, and debugger
  • Existing binary targets in src/bin/
  • Modular architecture with separate concerns

Implementation Goal

Add secure MCP server functionality to make Script the first "AI-native" programming language with built-in, secure AI assistant integration. The MCP server should expose Script's language intelligence while maintaining enterprise-grade security.

Security Requirements (CRITICAL)

Primary Security Principle: Never execute user code - only perform static analysis.

Security Layers Required:

  1. Input Validation: Strict code pattern filtering, size limits, complexity detection
  2. Sandboxing: Isolated analysis environment with resource limits
  3. Path Validation: Prevent directory traversal, restrict file access
  4. Rate Limiting: Prevent resource exhaustion attacks
  5. Audit Logging: Complete logging of all AI interactions
  6. Session Management: Secure session handling and cleanup

Architecture Overview

src/
├── mcp/                           # New MCP module
│   ├── mod.rs                     # Module exports
│   ├── server/                    # MCP server implementation
│   │   ├── mod.rs                 # Main server logic
│   │   └── protocol.rs            # MCP protocol types
│   ├── security/                  # Security framework
│   │   ├── mod.rs                 # Security manager
│   │   ├── validator.rs           # Input validation
│   │   └── audit.rs               # Audit logging
│   ├── sandbox/                   # Sandboxed analysis
│   │   ├── mod.rs                 # Sandbox implementation
│   │   └── analyzer.rs            # Safe code analysis
│   ├── tools/                     # MCP tools
│   │   ├── mod.rs                 # Tool registry
│   │   ├── script_analyzer.rs     # Code analysis tool
│   │   ├── formatter.rs           # Code formatting tool
│   │   └── documentation.rs       # Documentation generator
│   └── resources/                 # MCP resources
│       ├── mod.rs                 # Resource registry
│       └── project_files.rs       # Secure file access
├── bin/
│   └── script_mcp.rs              # New MCP server binary
└── lib.rs                         # Add mcp module export

Implementation Steps

1. Create Core MCP Module Structure

Create the following module structure with security-first design:

src/mcp/mod.rs:

  • Export all public APIs
  • Feature-gate MCP functionality
  • Define security configuration types

src/mcp/security/mod.rs:

  • SecurityManager for session management
  • Input validation and sanitization
  • Rate limiting and resource control
  • Audit logging system

src/mcp/sandbox/mod.rs:

  • SecureSandbox for isolated analysis
  • Resource limits (CPU, memory, time)
  • Safe AST analysis without code execution
  • Complexity metrics calculation

2. Implement MCP Server

src/mcp/server/mod.rs:

  • SecureMcpServer with full protocol support
  • Transport layer (stdio/tcp) with security
  • Session management and cleanup
  • Tool and resource registry

Protocol Support:

  • Initialize/capabilities negotiation
  • Tool calling with validation
  • Resource access with path restrictions
  • Error handling and security violations

3. Create Secure Tools

src/mcp/tools/script_analyzer.rs:

  • Integrate with existing lexer/parser/semantic analyzer
  • Provide syntax/semantic analysis results
  • Generate complexity metrics
  • Suggest improvements (game dev focused)

src/mcp/tools/formatter.rs:

  • Code formatting with Script conventions
  • Safe text transformation only

src/mcp/tools/documentation.rs:

  • Extract documentation comments
  • Generate structured documentation

4. Implement Secure Resources

src/mcp/resources/project_files.rs:

  • Secure file access with path validation
  • Read-only access to allowed directories
  • File type restrictions (.script, .md, .toml, etc.)
  • Project metadata generation

5. Create MCP Server Binary

src/bin/script_mcp.rs:

  • CLI with configuration options
  • Support for strict/development/production modes
  • Configuration file loading (TOML)
  • Graceful shutdown handling
  • Health check and statistics endpoints

6. Integration Requirements

Integrate with existing components:

  • Use existing Lexer, Parser, SemanticAnalyzer
  • Leverage existing error types and span information
  • Maintain consistency with LSP server architecture
  • Share configuration patterns with other tools

Cargo.toml updates:

  • Add MCP server binary target
  • Add required dependencies (tokio, serde, etc.)
  • Create "mcp" feature flag
  • Update existing dependencies as needed

Security Implementation Details

Input Validation Patterns

Detect and block these dangerous patterns:

  • File system operations: import std.fs, delete, remove
  • Network operations: http, tcp, connect
  • Process operations: exec, spawn, system
  • Path traversal: ../, ..\\
  • Excessive nesting (complexity bombs)

Resource Limits

  • Code size: 100KB default, 10KB strict mode
  • Analysis time: 30s default, 5s strict mode
  • Memory usage: 256MB default, 64MB strict mode
  • File access: Read-only to specific directories
  • Network access: Disabled by default

Audit Logging

Log all security events:

  • Session creation/destruction
  • Tool calls with parameters
  • Resource access attempts
  • Security violations
  • Rate limit violations

Configuration Examples

Development Mode (script-mcp-dev.toml):

[security]
max_code_size = 1000000
max_analysis_time = "60s"
allowed_paths = ["./src", "./docs", "./examples"]

Production Mode (script-mcp-prod.toml):

[security]
max_code_size = 50000
max_analysis_time = "15s"
allowed_paths = ["./src"]
audit_enabled = true

Testing Requirements

Create comprehensive tests for:

  • Security validation (malicious input rejection)
  • Sandbox isolation (resource limits)
  • Tool functionality (analysis accuracy)
  • Resource access (path validation)
  • Protocol compliance (MCP specification)

Integration with Existing Project

  1. Maintain existing architecture: Follow patterns from LSP server
  2. Reuse existing components: Leverage lexer, parser, semantic analyzer
  3. Consistent error handling: Use existing error types and spans
  4. Shared configuration: Similar patterns to other tools
  5. Testing integration: Add to existing test suite

Expected Outcomes

After implementation, users should be able to:

  1. Start MCP server: script-mcp --mode stdio --project-root ./my-game
  2. Connect AI assistants (Claude, ChatGPT, etc.)
  3. Get secure code analysis and suggestions
  4. Access project files safely
  5. Generate documentation
  6. Format code according to Script conventions

The AI assistant will understand Script's:

  • Syntax and semantics
  • Type system (gradual typing)
  • Game development patterns
  • Actor model concepts
  • Project structure and conventions

Success Criteria

  • ✅ MCP server starts without errors
  • ✅ AI assistants can connect and communicate
  • ✅ Code analysis works safely (no execution)
  • ✅ Security violations are detected and logged
  • ✅ Resource limits are enforced
  • ✅ File access is restricted appropriately
  • ✅ All tests pass
  • ✅ Documentation is complete

This implementation will make Script the first programming language designed specifically for secure AI integration, providing a significant competitive advantage over other languages that only have external AI tool support.

Files to Create/Modify

New Files:

  • src/mcp/mod.rs
  • src/mcp/security/mod.rs
  • src/mcp/sandbox/mod.rs
  • src/mcp/server/mod.rs
  • src/mcp/tools/mod.rs
  • src/mcp/tools/script_analyzer.rs
  • src/mcp/tools/formatter.rs
  • src/mcp/tools/documentation.rs
  • src/mcp/resources/mod.rs
  • src/mcp/resources/project_files.rs
  • src/bin/script_mcp.rs

Modified Files:

  • src/lib.rs (add mcp module export)
  • Cargo.toml (add binary target and dependencies)

Please implement this secure MCP functionality following the architecture and security requirements outlined above. Focus on security first, then functionality.