MCPInstall

async-patterns

by pluginagentmarketplaceBackend & APIs

Master asynchronous programming in Node.js with Promises, async/await, streams, and event-driven patterns for efficient non-blocking operations

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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/pluginagentmarketplace/custom-plugin-nodejs --skill async-patterns
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads async-patterns automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Async Programming Patterns Skill

Master asynchronous programming - the foundation of Node.js performance and scalability.

Quick Start

Three pillars of async JavaScript:

  1. Callbacks - Traditional pattern (error-first)
  2. Promises - Modern chainable pattern
  3. Async/Await - Synchronous-looking async code

Core Patterns

Callbacks → Promises → Async/Await Evolution

// 1. Callbacks (old way)
fs.readFile('file.txt', (err, data) => {
  if (err) throw err;
  console.log(data);
});

// 2. Promises (better)
fs.promises.readFile('file.txt')
  .then(data => console.log(data))
  .catch(err => console.error(err));

// 3. Async/Await (modern)
async function readFile() {
  try {
    const data = await fs.promises.readFile('file.txt');
    console.log(data);
  } catch (err) {
    console.error(err);
  }
}

Sequential vs Parallel

// ❌ Slow: Sequential (300ms total)
async function slow() {
  const a = await fetch('/api/a'); // 100ms
  const b = await fetch('/api/b'); // 100ms
  const c = await fetch('/api/c'); // 100ms
  return [a, b, c];
}

// ✅ Fast: Parallel (100ms total)
async function fast() {
  const [a, b, c] = await Promise.all([
    fetch('/api/a'),
    fetch('/api/b'),
    fetch('/api/c')
  ]);
  return [a, b, c];
}

Promise Methods

// Promise.all - Wait for all (fails if one fails)
const [users, posts] = await Promise.all([getUsers(), getPosts()]);

// Promise.allSettled - Wait for all (never fails)
const results = await Promise.allSettled([fetch1(), fetch2(), fetch3()]);

// Promise.race - First to complete
const fastest = await Promise.race([server1(), server2()]);

// Promise.any - First to succeed
const result = await Promise.any([tryAPI1(), tryAPI2()]);

Learning Path

Beginner (1-2 weeks)

  • ✅ Understand event loop
  • ✅ Master callbacks
  • ✅ Learn Promises basics
  • ✅ Practice async/await

Intermediate (3-4 weeks)

  • ✅ Error handling patterns
  • ✅ Sequential vs parallel execution
  • ✅ Promise composition
  • ✅ Event emitters

Advanced (5-6 weeks)

  • ✅ Streams and backpressure
  • ✅ Concurrency control
  • ✅ Circuit breakers
  • ✅ Performance optimization

Common Patterns

Error Handling

// Try/catch for async/await
async function safeOperation() {
  try {
    const result = await riskyOperation();
    return { success: true, data: result };
  } catch (error) {
    console.error('Operation failed:', error);
    return { success: false, error: error.message };
  }
}

// Process-level handlers
process.on('unhandledRejection', (reason, promise) => {
  console.error('Unhandled Rejection:', reason);
});

Retry with Exponential Backoff

async function retryWithBackoff(fn, maxRetries = 3) {
  for (let i = 0; i < maxRetries; i++) {
    try {
      return await fn();
    } catch (error) {
      if (i === maxRetries - 1) throw error;
      const delay = Math.pow(2, i) * 1000;
      await new Promise(resolve => setTimeout(resolve, delay));
    }
  }
}

Concurrency Limit

async function batchProcess(items, concurrency = 5) {
  const results = [];
  for (let i = 0; i < items.length; i += concurrency) {
    const batch = items.slice(i, i + concurrency);
    const batchResults = await Promise.all(
      batch.map(item => processItem(item))
    );
    results.push(...batchResults);
  }
  return results;
}

Streams

const { pipeline } = require('stream');
const fs = require('fs');

// Efficient file processing
pipeline(
  fs.createReadStream('input.txt'),
  transformStream,
  fs.createWriteStream('output.txt'),
  (err) => {
    if (err) console.error('Pipeline failed:', err);
    else console.log('Pipeline succeeded');
  }
);

Event Emitters

const EventEmitter = require('events');

class MyEmitter extends EventEmitter {}
const emitter = new MyEmitter();

emitter.on('event', (data) => {
  console.log('Event fired:', data);
});

emitter.emit('event', { id: 123 });

When to Use

Use async patterns when:

  • Handling I/O operations (file, network, database)
  • Building scalable Node.js applications
  • Managing multiple concurrent operations
  • Processing streams of data
  • Creating event-driven architectures

Related Skills

  • Express REST API (async route handlers)
  • Database Integration (async queries)
  • Testing & Debugging (test async code)
  • Performance Optimization (async performance)

Resources

FAQ

What does the async-patterns skill do?

Master asynchronous programming in Node.js with Promises, async/await, streams, and event-driven patterns for efficient non-blocking operations

How do I install async-patterns?

Run npx skills add https://github.com/pluginagentmarketplace/custom-plugin-nodejs --skill async-patterns in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/async-patterns/ (personal) or .claude/skills/async-patterns/ (project).

Which AI agents can use async-patterns?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is async-patterns safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains async-patterns?

It is published by pluginagentmarketplace in pluginagentmarketplace/custom-plugin-nodejs. It has 97 recorded installs.

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