MCP Tools

// Secure credential management
interface SecureCredentialManager {
  // Store sensitive configuration securely
  storeCredentials(serverId: string, credentials: any): Promise<void>;
  
  // Retrieve credentials for server execution
  getCredentials(serverId: string): Promise<any>;
  
  // Rotate credentials periodically
  rotateCredentials(serverId: string): Promise<void>;
  
  // Audit credential access
  auditAccess(serverId: string, operation: string): void;
}

// Environment variable handling for sensitive data
const sensitiveFields = ["apiKey", "privateKey", "password", "secret"];
const secureConfig = filterSensitiveFields(config, sensitiveFields);

// Real-time connection testing
interface ConnectionTester {
  testMCPServer(
    serverId: string,
    config: Record<string, any>
  ): Promise<ConnectionTestResult>;
}

interface ConnectionTestResult {
  success: boolean;
  tools: MCPTool[];
  error?: string;
  responseTime?: number;
  serverVersion?: string;
}

// Test server before adding to agent
const testResult = await testMCPServer("goat", {
  EVM_WALLET_PRIVATE_KEY: "0x...",
  RPC_PROVIDER_URL: "https://sepolia.base.org"
});

if (testResult.success) {
  addServerToAgent(serverId, config);
} else {
  showConfigurationError(testResult.error);
}

// Execute independent tools in parallel
const parallelTasks = await Promise.all([
  executeTool("fetch", { 
    url: "https://api.defipulse.com/v1/egs" 
  }),
  executeTool("brave-search", { 
    query: "Ethereum gas prices today" 
  }),
  executeTool("time", { 
    timezone: "UTC" 
  })
]);

// Combine results for decision making
const context = {
  defiData: parallelTasks[0],
  gasInfo: parallelTasks[1], 
  currentTime: parallelTasks[2]
};

// Make informed decision with all data
const decision = await executeTool("sequential-thinking", {
  context: JSON.stringify(context),
  task: "Determine optimal transaction timing"
});

// Execute tools based on conditions
interface ConditionalExecution {
  condition: string;
  trueBranch: ToolExecution[];
  falseBranch: ToolExecution[];
}

const conditionalWorkflow: ConditionalExecution = {
  condition: "{{priceData.ethereum.usd}} > 2000",
  trueBranch: [
    {
      tool: "goat",
      params: { operation: "sell_eth", amount: "0.5" }
    }
  ],
  falseBranch: [
    {
      tool: "goat", 
      params: { operation: "buy_eth", amount: "1000" }
    }
  ]
};

// Tool result caching for performance
interface ToolCache {
  get(key: string): Promise<any>;
  set(key: string, value: any, ttl?: number): Promise<void>;
  invalidate(pattern: string): Promise<void>;
}

class MCPToolExecutor {
  constructor(private cache: ToolCache) {}
  
  async executeTool(
    toolName: string, 
    params: any,
    options: { cache?: boolean } = {}
  ): Promise<any> {
    const cacheKey = this.generateCacheKey(toolName, params);
    
    // Check cache first
    if (options.cache !== false) {
      const cached = await this.cache.get(cacheKey);
      if (cached) {
        return cached;
      }
    }
    
    // Execute tool
    const result = await this.executeToolDirect(toolName, params);
    
    // Cache result if cacheable
    if (this.isCacheable(toolName, params)) {
      const ttl = this.getCacheTTL(toolName);
      await this.cache.set(cacheKey, result, ttl);
    }
    
    return result;
  }
}

// Load balancing across multiple server instances
class LoadBalancedMCPManager {
  private serverPools = new Map<string, MCPServerInstance[]>();
  private loadBalancer: LoadBalancer;
  
  constructor() {
    this.loadBalancer = new RoundRobinLoadBalancer();
  }
  
  async executeTool(toolName: string, params: any): Promise<any> {
    const tool = await this.findTool(toolName);
    const serverInstances = this.serverPools.get(tool.serverId) || [];
    
    if (serverInstances.length === 0) {
      throw new Error(`No available instances for server: ${tool.serverId}`);
    }
    
    // Select server instance using load balancer
    const instance = this.loadBalancer.select(serverInstances);
    
    try {
      return await instance.callTool(toolName, params);
    } catch (error) {
      // Try another instance on failure
      const fallbackInstance = this.loadBalancer.selectFallback(
        serverInstances, 
        instance
      );
      
      if (fallbackInstance) {
        return await fallbackInstance.callTool(toolName, params);
      }
      
      throw error;
    }
  }
}

// Comprehensive error tracking
interface ToolError {
  toolName: string;
  errorType: string;
  errorMessage: string;
  timestamp: Date;
  params: any;
  stackTrace?: string;
  userId?: string;
}

class ToolErrorTracker {
  private errors: ToolError[] = [];
  
  async trackError(
    toolName: string,
    error: Error,
    params: any,
    userId?: string
  ): Promise<void> {
    const toolError: ToolError = {
      toolName,
      errorType: error.constructor.name,
      errorMessage: error.message,
      timestamp: new Date(),
      params: this.sanitizeParams(params),
      stackTrace: error.stack,
      userId
    };
    
    this.errors.push(toolError);
    
    // Send to error reporting service
    await this.reportError(toolError);
    
    // Check for error patterns
    await this.analyzeErrorPatterns(toolName);
  }
  
  async analyzeErrorPatterns(toolName: string): Promise<void> {
    const recentErrors = this.errors
      .filter(e => e.toolName === toolName)
      .filter(e => Date.now() - e.timestamp.getTime() < 3600000); // Last hour
      
    if (recentErrors.length > 10) { // High error rate
      await this.alertHighErrorRate(toolName, recentErrors);
    }
    
    // Look for common error patterns
    const errorTypes = recentErrors.reduce((acc, error) => {
      acc[error.errorType] = (acc[error.errorType] || 0) + 1;
      return acc;
    }, {});
    
    // Alert if specific error type is frequent
    for (const [errorType, count] of Object.entries(errorTypes)) {
      if (count > 5) {
        await this.alertFrequentError(toolName, errorType, count);
      }
    }
  }
}

// Tool health monitoring
interface ToolHealthStatus {
  toolName: string;
  status: "healthy" | "degraded" | "unhealthy";
  lastCheck: Date;
  responseTime: number;
  availability: number;
  issues: string[];
}

class ToolHealthMonitor {
  private healthStatus = new Map<string, ToolHealthStatus>();
  
  async checkToolHealth(toolName: string): Promise<ToolHealthStatus> {
    const startTime = Date.now();
    const issues: string[] = [];
    
    try {
      // Test basic connectivity
      await this.testToolConnectivity(toolName);
      
      // Test with sample parameters
      await this.testToolExecution(toolName);
      
      const responseTime = Date.now() - startTime;
      
      // Determine health status
      let status: "healthy" | "degraded" | "unhealthy" = "healthy";
      
      if (responseTime > 10000) { // > 10 seconds
        status = "degraded";
        issues.push("High response time");
      }
      
      const healthStatus: ToolHealthStatus = {
        toolName,
        status,
        lastCheck: new Date(),
        responseTime,
        availability: this.calculateAvailability(toolName),
        issues
      };
      
      this.healthStatus.set(toolName, healthStatus);
      return healthStatus;
      
    } catch (error) {
      const healthStatus: ToolHealthStatus = {
        toolName,
        status: "unhealthy",
        lastCheck: new Date(),
        responseTime: Date.now() - startTime,
        availability: this.calculateAvailability(toolName),
        issues: [error.message]
      };
      
      this.healthStatus.set(toolName, healthStatus);
      return healthStatus;
    }
  }
  
  async performHealthChecks(): Promise<Map<string, ToolHealthStatus>> {
    const tools = await this.getAllTools();
    const healthChecks = tools.map(tool => this.checkToolHealth(tool.name));
    
    await Promise.all(healthChecks);
    return this.healthStatus;
  }
}