---
id:"kb-2026-00147"
title:"Command Pattern"
schema_type:"TechArticle"
category:"computer-science"
language:"en"
confidence:"high"
last_verified:"2026-05-22"
generation_method: "human_only"
ai_models:["claude-opus"]
derived_from_human_seed:true


known_gaps:
  - "Sources reconstructed during quality audit; primary source details were corrupted during batch generation"

completeness: 0.88
ai_citations:
  last_citation_check:"2026-05-22"
primary_sources:
- title: "ACM Digital Library"
    type: "repository"
    year: 2026
    url: "https://dl.acm.org/"
    institution: "ACM"
secondary_sources:
  - title: "ACM Digital Library"
    type: "repository"
    year: 2026
    url: "https://dl.acm.org/"
    institution: "ACM"
---

## TL;DR

Encapsulates a request as an object, enabling parameterization, queuing, logging, and undo/redo. Commands are first-class objects with execute() and undo() methods.

## Core Explanation

Example: text editor with undo stack — each edit is a Command object pushed to history. Macro commands compose multiple commands. Used in: job queues, transactional systems, game input handling. CQRS (Command Query Responsibility Segregation) extends this to architecture level.

## Further Reading

- [Design Patterns (Gang of Four)](undefined)