MCP Configuration Best Practices

This guide outlines recommended patterns, anti-patterns, and optimization strategies for MCP configuration.

Configuration Management

Recommended Patterns

Use Environment-Specific Configurations

// config/development.json
{
  "onli-mcp": {
    "url": "https://stg.onli.app",
    "headers": {
      "User-Id": "${ONLI_DEV_USER_ID}",
      "App-Key": "${ONLI_DEV_APP_KEY}",
      "App-Symbol": "ENGMA"
    },
    "options": {
      "debug": true,
      "timeout": 30000
    }
[object Object][object Object]

Implement Configuration Validation

function validateConfig(config) {
  const required = ['url', 'headers.User-Id', 'headers.App-Key', 'headers.App-Symbol'];
  
  for (const field of required) {
    if (!getNestedValue(config, field)) {
      throw new Error(`Missing required field: ${field}`);
    }
  }
  
  return true;
[object Object]

Use Configuration Factories

class MCPConfigFactory {
  static createConfig(environment) {
    const baseConfig = {
      headers: {
        'User-Id': process.env.ONLI_USER_ID,
        'App-Key': process.env.ONLI_APP_KEY,
        'App-Symbol': process.env.ONLI_APP_SYMBOL || 'ENGMA'
      }
    };

    switch (environment) {
      case 'development':
        return [object Object]
[object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object]

Anti-Patterns to Avoid

Hardcoding Credentials

// DON'T DO THIS
const config = {
  "onli-mcp": {
    "url": "https://api.onli.app",
    "headers": {
      "User-Id": "user_12345_hardcoded",  // Never hardcode
      "App-Key": "ak_secret_key_123",     // Security risk
      "App-Symbol": "ENGMA"
    }
  }
};

Single Configuration for All Environments

// DON'T DO THIS - Use environment-specific configs
const oneConfigForAll = {
  url: "https://api.onli.app",  // Should vary by environment
  debug: true                   // Should be false in production
};

Missing Error Handling

// DON'T DO THIS
const client = new MCPClient(config);  // No validation or error handling
client.connect();                      // No error handling

Security Best Practices

Credential Management

Use Environment Variables

# .env.development
ONLI_USER_ID=dev_user_12345
ONLI_APP_KEY=ak_dev_secret_key
ONLI_APP_SYMBOL=ENGMA

# .env.production
ONLI_USER_ID=prod_user_67890
ONLI_APP_KEY=ak_prod_secret_key
ONLI_APP_SYMBOL=ENGMA

Implement Credential Rotation

class CredentialManager {
  constructor() {
    this.refreshInterval = 24 * 60 * 60 * 1000; // 24 hours
    this.setupRotation();
  }

  async rotateCredentials() {
    const newCredentials = await this.fetchNewCredentials();
    this.updateConfig(newCredentials);
    this.scheduleNextRotation()[object Object]
[object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object]

Monitor API Usage

class APIMonitor {
  trackRequest(endpoint, method, timestamp) {
    // Log API usage patterns
    console.log(`API Call: ${method} ${endpoint} at ${timestamp}`);
    
    // Check for unusual patterns
    this.detectAnomalies(endpoint, method);
  }

  detectAnomalies(endpoint, method) {
    [object Object]
[object Object][object Object][object Object][object Object][object Object][object Object][object Object]

Network Security

Always Use HTTPS

const config = {
  url: "https://api.onli.app",  // Always HTTPS
  options: {
    rejectUnauthorized: true,   // Verify SSL certificates
    secureProtocol: 'TLSv1_2_method'  // Use secure protocols
  }
};

Implement Request Signing

class SecureClient {
  signRequest(request) {
    const timestamp = Date.now();
    const signature = this.generateSignature(request, timestamp);
    
    return {
      ...request,
      headers: {
        ...request.headers,
        'X-Timestamp': timestamp,
        'X-Signature': signature
      }
    };
  }
[object Object]

Performance Optimization

Connection Management

Connection Pooling

const config = {
  "onli-mcp": {
    "url": "https://api.onli.app",
    "headers": {
      "User-Id": "${ONLI_USER_ID}",
      "App-Key": "${ONLI_APP_KEY}",
      "App-Symbol": "ENGMA"
    },
    "options": {
      "pooling": {
        "maxConnections": 10,
        "keepAlive": true,
        "keepAliveMsecs": 30000
      }
    [object Object]
[object Object][object Object]

Appropriate Timeouts

const timeoutConfig = {
  development: {
    connectionTimeout: 10000,
    requestTimeout: 30000,
    retryDelay: 2000
  },
  production: {
    connectionTimeout: 5000,
    requestTimeout: 15000,
    retryDelay: 1000
  }
};

Retry Strategies

Exponential Backoff

class RetryManager {
  async executeWithRetry(operation, maxRetries = 3) {
    let attempt = 0;
    
    while (attempt < maxRetries) {
      try {
        return await operation();
      } catch (error) {
        if (!this.isRetryableError(error) || attempt === maxRetries - 1) {
          throw error;
        [object Object]
[object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object]

Error Handling

Comprehensive Error Handling

class MCPErrorHandler {
  handleError(error, context) {
    switch (error.type) {
      case 'AUTHENTICATION_ERROR':
        this.handleAuthError(error, context);
        break;
      case 'NETWORK_ERROR':
        this.handleNetworkError(error, context);
        break;
      case 'TIMEOUT_ERROR':
        this.handleTimeoutError(error, context);
[object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object]

Circuit Breaker Pattern

class CircuitBreaker {
  constructor(threshold = 5, timeout = 60000) {
    this.failureThreshold = threshold;
    this.timeout = timeout;
    this.failureCount = 0;
    this.state = 'CLOSED'; // CLOSED, OPEN, HALF_OPEN
    this.lastFailureTime = null;
  }

  async execute(operation) {
    if (this.[object Object] [object Object] [object Object][object Object] [object Object]
[object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object]

Monitoring and Logging

Structured Logging

const logger = {
  logMCPOperation(operation, duration, success, metadata = {}) {
    const logEntry = {
      timestamp: new Date().toISOString(),
      operation,
      duration,
      success,
      environment: process.env.NODE_ENV,
      ...metadata
    };

    if (success) {
      console.log[object Object][object Object][object Object] [object Object][object Object][object Object][object Object]logEntry[object Object][object Object][object Object]
[object Object][object Object][object Object][object Object][object Object]

Health Checks

class HealthChecker {
  async performHealthCheck() {
    const checks = [
      this.checkConnectivity(),
      this.checkAuthentication(),
      this.checkLatency()
    ];

    const results = await Promise.allSettled(checks);
    
    return {
      healthy: results.every(r => r[object Object][object Object] [object Object] [object Object][object Object][object Object]
[object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object]

Testing Best Practices

Mock External Dependencies

// test/mcp-client.test.js
describe('MCP Client', () => {
  beforeEach(() => {
    nock('https://stg.onli.app')
      .get('/health')
      .reply(200, { status: 'healthy' });
  });

  it('should connect successfully with valid config', async () => {
    const config = createTestConfig()[object Object]
[object Object][object Object][object Object][object Object][object Object][object Object]

Test Different Environments

const testConfigs = {
  development: createDevConfig(),
  staging: createStagingConfig(),
  production: createProdConfig()
};

Object.entries(testConfigs).forEach(([env, config]) => {
  describe(`${env} environment`, () => {
    [object Object][object Object][object Object][object Object] [object Object][object Object] [object Object] [object Object]
[object Object][object Object][object Object][object Object]

Next Steps

Review Setup Instructions for implementation details
Check Troubleshooting Guide for common issues
Join our Developer Community for best practice discussions

Support

For questions about best practices:

Email: support@onli.one
Documentation: Configuration Guides
Community: Onli Developer Forum