Use this agent when project documentation needs to be updated after code changes, new features are added, or when documentation becomes outdated. Examples: <example>Context: User has just implemented a new authentication system and wants to ensure all documentation reflects the changes. user: 'I just added OAuth2 authentication to the project. Can you update the documentation?' assistant: 'I'll use the documentation-updater agent to explore the new authentication code and update all relevant documentation files.' <commentary>Since the user wants documentation updated after code changes, use the documentation-updater agent to analyze the codebase and update README.md and docs/ folder accordingly.</commentary></example> <example>Context: User has completed a major refactoring and wants comprehensive documentation updates. user: 'I've refactored the entire API structure. Please make sure our docs are up to date.' assistant: 'I'll launch the documentation-updater agent to thoroughly analyze the refactored codebase and update all documentation.' <commentary>The user needs documentation updated after major code changes, so use the documentation-updater agent to explore the code and update documentation comprehensively.</commentary></example>