Automated accessibility testing and compliance checking for web applications following WCAG 2.1 and WCAG 2.2 guidelines. This hook automatically runs accessibility scans on HTML files after they are written or edited, using axe-core for comprehensive WCAG compliance testing. Features include automated violation detection, color contrast analysis, keyboard navigation testing, screen reader compatibility checks, and comprehensive accessibility reporting. The hook integrates seamlessly into development workflows, providing real-time accessibility feedback during development and ensuring WCAG compliance before deployment. Supports both advanced axe-core scanning and fallback basic checks for environments without axe-core installed.

Automatically generates or updates API documentation when endpoint files are modified, supporting OpenAPI 3.1.0, Swagger 2.0, and AsyncAPI 2.0 specifications. This hook automatically detects changes to API route files (JavaScript, TypeScript, Python) and generates comprehensive documentation using swagger-jsdoc (v6+), JSDoc, or FastAPI's built-in OpenAPI generation. Features include real-time documentation synchronization, multi-format output (JSON, YAML, Markdown), automatic endpoint discovery, parameter and response type extraction, and integration with Swagger UI and ReDoc for interactive documentation. The hook supports both annotation-based documentation (JSDoc comments) and automatic schema inference (FastAPI), ensuring API documentation stays synchronized with code changes throughout the development lifecycle.

Automatically formats code files after Claude writes or edits them using industry-standard formatters including Prettier 3.6.2+ (JavaScript/TypeScript/Web), Black or Ruff (Python), gofmt (Go), and rustfmt (Rust). This hook automatically detects file types and applies appropriate formatting rules, ensuring consistent code style across team projects without manual intervention. Features include language-specific formatting rules, automatic formatter detection, configurable timeout and error handling, preservation of file permissions and structure, and silent operation with optional feedback. The hook supports multiple programming languages in the same project, automatically fixes formatting issues after AI code generation, and reduces code review friction by handling formatting automatically. Supports both traditional formatters (Prettier, Black) and modern high-performance alternatives (Ruff for Python, which is 10-100x faster than Black while maintaining Black-compatible formatting).

Automatically creates timestamped backups of files before modification to prevent data loss. This hook runs before file editing operations (Edit, Write, Multiedit) and creates versioned backups in a centralized .backups directory with ISO 8601-compliant timestamps including nanoseconds for collision prevention. Features include automatic backup creation before any file modification, organized backup storage with configurable retention policies, support for all file editing operations including bulk operations, version history maintenance with automatic cleanup, and silent failure handling to prevent workflow interruption. The hook implements best practices including disk space management, backup rotation policies, and efficient file copying to ensure reliable data protection without impacting development workflow performance.

Validates AWS CloudFormation templates for syntax errors and best practices using cfn-lint v1.40.4+ and AWS CLI v2.27.54+. This hook automatically detects CloudFormation template files (JSON, YAML) and runs comprehensive validation including syntax error detection, AWS best practices compliance checking, type mismatch validation, resource property validation, and SAM template support. Features include advanced CloudFormation template validation with cfn-lint supporting multi-region validation, custom rules, and comprehensive error reporting. The hook provides fallback to AWS CLI validation when cfn-lint is unavailable, ensuring validation works in all environments. Supports both JSON and YAML template formats, automatically transforms SAM templates to CloudFormation for validation, and integrates seamlessly into development workflows and CI/CD pipelines for infrastructure as code quality assurance.

Automatically backs up changed files to cloud storage when Claude Code session ends using AWS S3, Google Cloud Storage, or rclone for universal cloud provider support. This hook runs on session stop and intelligently identifies modified files using git diff, creates timestamped backup archives, and uploads them to configured cloud storage providers. Features include automatic cloud backup when Claude session ends, support for multiple cloud providers (AWS S3, Google Cloud Storage, rclone for 40+ providers), intelligent file selection using git diff to track only changed files, timestamped backup archives with ISO 8601 format, fallback to rclone for universal cloud support, and environment variable configuration for security. The hook implements best practices including incremental backups, compression for efficient storage, error handling with graceful fallbacks, and secure credential management using environment variables.

Alerts when code complexity exceeds thresholds in real-time using cyclomatic complexity analysis, line count monitoring, function count analysis, and nesting level detection. This hook runs on file write operations and analyzes JavaScript, TypeScript, and Python code to detect maintainability issues before they become technical debt. Features include real-time complexity monitoring for JavaScript, TypeScript, and Python using pattern matching and AST-based analysis, configurable line count thresholds (default: 500 lines) with customizable warning and error levels, function count analysis and alerting to detect over-modularization or under-modularization, nesting level detection for code structure using brace counting and indentation depth analysis, instant feedback on code maintainability issues with severity levels (INFO, WARNING, ERROR), multi-language support with pattern matching for .js, .jsx, .ts, .tsx, and .py files, cyclomatic complexity estimation using control flow analysis, and integration with ESLint complexity rules (max-complexity) and Radon for Python for comprehensive analysis.

Automatically run relevant tests when code changes are detected using intelligent test selection, parallel execution, and multi-framework support. This hook runs on file write/edit operations and automatically identifies and executes tests related to changed files using dependency analysis, test file pattern matching, and framework-specific test discovery. Features include intelligent test selection based on code changes using Jest --findRelatedTests, Vitest test selection patterns, and pytest test discovery, parallel test execution for faster feedback using Jest workers, Vitest concurrent tests, and pytest-xdist, support for multiple testing frameworks including Jest v29.7.0+, Vitest v4.0.7+, pytest 9.0.0+, Go testing, Maven, and Gradle, fail-fast mode for quick feedback stopping on first failure, smart retry for flaky tests with configurable retry counts, impact analysis and dependency mapping to find tests affected by code changes, and integration with CI/CD pipelines for automated testing workflows.

Detects unused CSS selectors when stylesheets are modified to keep CSS lean using PurgeCSS, PostCSS, and content analysis. This hook runs on CSS/SCSS file write/edit operations and automatically analyzes stylesheets to identify unused selectors, generate optimized CSS output, and provide before/after comparison metrics. Features include automatic unused CSS selector detection with PurgeCSS ^6.0.0+ for comprehensive content scanning, support for CSS, SCSS, SASS, and modern CSS frameworks (Tailwind CSS, Bootstrap, Material UI), content analysis across HTML, JS, JSX, TS, TSX, Vue, and Svelte files using multiple content path patterns, before/after comparison with line count reduction and byte size savings calculation, optimized CSS output generation with safelist support for critical framework classes, integration with modern build workflows supporting Vite, Webpack, Rollup, and PostCSS pipelines, safelist configuration to protect dynamically-generated classes and framework utilities, and detailed reporting with percentage reduction metrics and file size savings.

Closes all database connections and cleans up resources when Claude Code session ends using PostgreSQL pg_terminate_backend, MySQL KILL, MongoDB connection management, and Redis CLIENT KILL commands. This hook runs on session stop and automatically identifies active database connections, terminates idle connections exceeding timeout thresholds, monitors connection counts, and reports resource usage. Features include automatic database connection cleanup on session end using Stop hook with intelligent connection detection, multi-database support for PostgreSQL 17+, MySQL 8.0+, MongoDB 7.0+ (mongosh), and Redis 7.0+ with automatic database type detection, idle connection termination for PostgreSQL using pg_terminate_backend with configurable timeout thresholds (default: 5 minutes), connection monitoring and reporting showing active, idle, and total connection counts for each database type, safe cleanup with error handling preventing accidental termination of critical connections, resource leak prevention automatically closing orphaned connections and cleaning up connection pools, connection string detection from environment variables (.env files) for automatic database discovery, and detailed reporting with connection statistics and cleanup results for each database type.

Automated database migration management with rollback capabilities, validation, and multi-environment support using Knex 3.x, Sequelize 6.x/7.x, TypeORM 0.3.x, Django 5.x, and Rails 7.x. This PostToolUse hook automatically detects migration-related files when created or edited, identifies the migration framework in use, checks migration status, validates migration files for potentially destructive operations, and provides framework-specific guidance. Features include automated database migration detection and execution with intelligent framework detection, support for multiple database systems (PostgreSQL, MySQL, SQLite, SQL Server) across all major migration frameworks, safe rollback capabilities with validation and transaction support, migration file integrity checking with checksums and validation, environment-specific migration configurations for development, staging, and production, CI/CD pipeline integration with automated migration execution, destructive operation detection warning about DROP/DELETE/TRUNCATE statements, and migration best practices reminders including backup recommendations and testing guidelines.

Monitors and logs database query performance metrics with slow query detection, N+1 analysis, and optimization suggestions using PostgreSQL pg_stat_statements, Prisma query logging, Sequelize query logging, TypeORM query logging, and Bullet N+1 detection patterns. This PostToolUse hook automatically detects database query files and commands, analyzes query patterns for performance issues, identifies N+1 query problems, detects slow queries exceeding configurable thresholds, monitors database connection pools, provides query plan analysis and optimization hints, and logs performance metrics for historical analysis. Features include automatic slow query detection and alerting with configurable thresholds (default: 1000ms), N+1 query pattern identification detecting loops with database queries and suggesting eager loading, query execution time tracking and statistics with detailed performance metrics, database connection pool monitoring tracking active connections and pool utilization, query plan analysis and optimization hints using EXPLAIN/ANALYZE for PostgreSQL, support for PostgreSQL 17+ (pg_stat_statements), MySQL 8.0+, SQLite query logs, Prisma 5.x query logging, Sequelize 6.x/7.x query logging, and TypeORM 0.3.x query logging, SELECT * pattern detection warning about unnecessary data transfer, missing LIMIT clause detection preventing unbounded result sets, and unindexed WHERE clause detection suggesting index creation.

Automatically detects and removes unused code, imports, and dependencies with safe deletion verification and rollback support using Knip 5.x, ts-prune, depcheck, autoflake, Vulture, and ESLint 9.37.0. This SessionEnd hook runs when Claude Code session ends and automatically analyzes the codebase for unused imports, dead code paths, unreferenced functions and variables, orphaned test files, unused dependencies, and zero-coverage files. Features include unused import detection and removal across multiple languages (JavaScript/TypeScript, Python, and more), dead code path identification using static analysis and AST parsing, unreferenced function and variable detection with confidence scoring, orphaned test file cleanup with verification and safety checks, safe deletion with backup and rollback capabilities creating timestamped backups before removal, bundle size impact analysis after cleanup showing size reduction metrics, coverage-based dead code detection identifying zero-coverage files as potential dead code, and multi-language support for JavaScript/TypeScript (Knip 5.x, ts-prune, ESLint 9.37.0), Python (autoflake, Vulture), and dependency analysis (depcheck).

Performs a comprehensive security audit of all dependencies when Claude Code session ends using npm audit (npm 10.x+), yarn audit (Yarn 4.x+), pip-audit 2.7.x+, safety, bundler-audit, and OWASP dep-scan. This Stop hook automatically detects package managers, runs security vulnerability scans, identifies outdated packages, generates detailed audit reports, and provides remediation recommendations. Features include comprehensive security audit for multiple package managers (npm, Yarn, pnpm, pip, Poetry, bundler) with automatic detection, support for NPM 10.x+, Yarn 4.x+, Python (pip-audit 2.7.x+, safety), and Ruby (bundler-audit) dependency scanning, vulnerability detection with severity levels (critical, high, moderate, low) and CVSS scores, outdated package identification showing current vs latest versions with update recommendations, detailed audit report generation with timestamped logs and vulnerability details, integration with popular security tools (npm audit, pip-audit, safety, bundler-audit, OWASP dep-scan), SBOM (Software Bill of Materials) generation support for compliance and supply chain security, and automated remediation suggestions with fix commands and version recommendations.

Real-time vulnerability scanning for dependencies with automated CVE detection, severity assessment, and patch recommendations. This PostToolUse hook automatically triggers security scans when dependency manifest files (package.json, requirements.txt, Cargo.toml, go.mod, Gemfile, composer.json) are modified. Supports npm audit (npm 10.x+), yarn audit (Yarn 4.x+), pip-audit 2.9.0+, safety, cargo-audit, govulncheck, and bundler-audit with real-time CVE database integration, severity-based alerting (critical, high, medium, low), automatic patch version recommendations, license compliance checking, and supply chain security validation. Features include automated vulnerability scanning on dependency file changes with PostToolUse hook integration, CVE database integration for real-time threat detection using official vulnerability databases, severity-based alerting (critical, high, medium, low) with CVSS scores and detailed vulnerability descriptions, automatic patch version recommendations with fix commands and compatibility checks, support for npm 10.x+, yarn 4.x+, pip-audit 2.9.0+, safety, cargo-audit, govulncheck, bundler-audit, and composer audit, license compliance checking and risk assessment with license type detection, and supply chain security validation with SBOM generation support.

Automatically checks for outdated dependencies and suggests updates with security analysis. This PostToolUse hook triggers when dependency manifest files (package.json, requirements.txt, Gemfile, go.mod, Cargo.toml, pyproject.toml) are modified, providing real-time dependency health monitoring. Supports npm-check-updates (ncu), npm outdated, pip-audit 2.9.0+, safety, cargo-outdated, cargo-audit, govulncheck, and bundler-audit with categorized update recommendations (critical, major, minor, patch), breaking change warnings for major version updates, security vulnerability detection integrated with dependency updates, multi-language support (Node.js, Python, Ruby, Go, Rust), and detailed update strategy guidance with changelog references.

Sends development activity updates to Discord channel for team collaboration. This Notification hook automatically sends rich embed messages to Discord webhooks when Claude Code activities occur, providing real-time team visibility into development workflows. Features include real-time Discord notifications for Claude Code activities (tool usage, file operations, errors), rich embed messages with file information, timestamps, Git branch/commit details, and file type icons, dynamic color coding based on action types (success: green, error: red, warning: yellow, edit/write: purple), team collaboration and activity visibility with configurable webhook integration, silent operation with fallback error handling and rate limiting support, Discord webhook API integration using curl with proper JSON formatting, and embed customization with fields, footers, and timestamps following Discord embed specifications.

Automatically rebuilds Docker containers when Dockerfile or docker-compose.yml files are modified. This PostToolUse hook triggers automatic Docker image rebuilding when Docker-related files (Dockerfile, docker-compose.yml, .dockerignore) are modified, providing real-time container synchronization during development. Supports Docker Engine 24.0+, Docker Compose v2 (docker compose), BuildKit for faster builds, multi-stage builds, layer caching optimization, and intelligent file detection for Docker-related configurations. Features include automatic Docker image rebuilding on Dockerfile changes with BuildKit support and layer caching, Docker Compose v2 service rebuilding for compose file updates with dependency resolution, intelligent file detection for Docker-related configurations (Dockerfile, docker-compose.yml, .dockerignore, .dockerfile), support for multiple Docker file patterns and variations with explicit Dockerfile path specification, build status reporting and error handling with detailed build output and image information, development environment synchronization with automatic container updates, BuildKit integration for faster builds with cache mount support, and .dockerignore optimization for reduced build context size.

Comprehensive Docker image vulnerability scanning with layer analysis, base image recommendations, and security best practices enforcement. This PostToolUse hook automatically scans Docker images for vulnerabilities when Dockerfiles are modified, providing real-time security validation during development. Supports Trivy 0.52.0+, Grype, Docker Scout (Docker Desktop 4.17+), SBOM generation, VEX (Vulnerability Exploitability eXchange) support, and comprehensive security best practices validation. Features include automated vulnerability scanning on Dockerfile changes with real-time security validation, Docker image layer-by-layer security analysis with detailed vulnerability reporting, base image vulnerability detection and recommendations with alternative base image suggestions, malware and rootkit scanning in container images using Trivy and Grype, security best practices validation (non-root user, minimal layers, version pinning, secrets detection), and integration with Trivy 0.52.0+, Grype, and Docker Scout for comprehensive vulnerability coverage.

Automatically generates or updates project documentation when session ends. This Stop hook provides comprehensive documentation generation for multiple programming languages and frameworks, supporting TypeDoc 0.26.0+ for TypeScript, JSDoc 4.0.0+ for JavaScript, Sphinx 7.0+ and pdoc 14.0+ for Python, Go doc/godoc for Go projects, and Cargo doc for Rust projects. Features include automatic API documentation generation with multi-language support, changelog updates with session summaries, project structure analysis and documentation, README file updates and maintenance, multi-format output (HTML, Markdown, PDF), and comprehensive documentation index generation. The hook automatically detects project type and uses appropriate documentation generators, ensuring documentation stays up-to-date with code changes.

Automated documentation coverage analysis with missing docstring detection, API documentation validation, and completeness scoring. This PostToolUse hook automatically checks documentation coverage when code files are modified, providing real-time documentation quality validation during development. Supports JSDoc 4.0.0+, TSDoc (Microsoft specification), Python docstring validation with interrogate, Go documentation checking, API endpoint documentation validation with OpenAPI/Swagger, and comprehensive documentation coverage metrics and reporting. Features include automatic detection of undocumented functions and classes, multi-language documentation validation (JavaScript, TypeScript, Python, Go, Rust), API endpoint documentation completeness checking, documentation coverage metrics and reporting with threshold enforcement, README and changelog freshness validation, and support for multiple languages and documentation formats.

Automatically generates and updates project documentation from code comments, README files, and API definitions. This PostToolUse hook provides real-time documentation generation when code files are modified, supporting multiple programming languages and documentation formats. Features include real-time documentation generation from code comments with automatic detection of JSDoc, TSDoc, Python docstrings, Go comments, and Rust documentation comments, multi-language support (JavaScript, TypeScript, Python, Go, Rust) with appropriate documentation generators (JSDoc 4.0.0+, TypeDoc 0.26.0+, pdoc 14.0+, Go doc, Cargo doc), API documentation extraction from JSDoc, docstrings, and comments with automatic API endpoint detection and documentation, README.md analysis and improvement suggestions with completeness checking and metadata validation, documentation quality and completeness checking with coverage metrics, and integration with popular documentation tools including jsdoc2md for markdown output.

Cleans up temporary files, caches, and resources when Claude session ends. This Stop hook provides comprehensive environment cleanup for development projects, automatically removing temporary files, build artifacts, cache directories, and system-specific files across multiple platforms. Features include automatic temporary file cleanup (*.tmp, *.log, .DS_Store, Thumbs.db) with cross-platform support, NPM cache verification and cleanup with npm 10.x+ support, Python bytecode and __pycache__ directory removal with Python 3.12+ support, development build artifacts cleanup including object files and shared libraries, disk space usage reporting and optimization with detailed cache size reporting, multi-platform support (macOS, Linux, Windows) with platform-specific cleanup rules, safe cleanup with error handling and logging, and cache invalidation for faster future builds. The hook automatically detects project type and cleans up language-specific artifacts, ensuring development environments remain clean and optimized.

Validates environment variables, checks for required vars, and ensures proper configuration across environments. This PostToolUse hook provides comprehensive environment variable validation when .env files, docker-compose files, or configuration files are modified, ensuring secure and consistent configuration across development, staging, and production environments. Features include automatic validation when .env files are modified with real-time validation feedback, required environment variable checking with cross-environment consistency validation, security validation for insecure defaults and weak secrets with minimum length requirements (16+ characters for secrets, 32+ for JWT/encryption keys), format validation for URLs, emails, ports, and booleans with comprehensive type checking, cross-environment consistency checking comparing .env, .env.local, .env.development, .env.staging, and .env.production files, production vs development environment validation with environment-specific security rules, configuration schema validation with Docker Compose environment variable validation, and comprehensive error reporting and security warnings with detailed validation summaries.

Tracks error patterns and alerts when error rates spike. This Notification hook provides comprehensive error rate monitoring across log files, Docker containers, and application logs, automatically detecting error patterns and alerting when error rates exceed configurable thresholds. Features include real-time error pattern detection in log files with automatic log file discovery across standard and framework-specific locations, configurable error rate thresholds and alerting with environment variable configuration, multi-log file monitoring (*.log, logs/*, custom paths) with recursive directory scanning, error severity classification (fatal, error, warning) with pattern-based severity detection, recent error sample display for quick debugging with truncated error messages, time-based error rate calculations with configurable time windows, framework-specific error pattern recognition for Node.js, Python, Next.js, and Docker applications, and silent operation with threshold-based notifications. The hook automatically discovers log files in common locations and monitors Docker container logs when Docker is available, providing comprehensive error monitoring across development environments.

Alerts when files exceed size thresholds that could impact performance. This PostToolUse hook provides comprehensive file size monitoring when files are created or modified, automatically detecting files that exceed recommended size thresholds for different file types and providing optimization suggestions. Features include real-time file size monitoring during write/edit operations with automatic file size detection across platforms, configurable size thresholds for different file types (source code 500KB, images 2MB, videos 50MB, JSON 1MB) with environment variable overrides, file type-specific recommendations (images, JSON, code, etc.) with optimization suggestions for each file type, performance impact warnings for large files with impact assessment (high/medium/low), Git repository size impact analysis with size change tracking and Git LFS recommendations, compression suggestions for media files including JPEG optimization, WebP format, and video compression, size comparison with previous versions using Git history to track file size growth, and multi-platform file size detection (macOS, Linux, Windows) with cross-platform stat command compatibility. The hook automatically detects file types and provides appropriate optimization suggestions, helping maintain optimal file sizes for performance and repository health.

Analyzes and reports final bundle sizes when the development session ends. This Stop hook provides comprehensive bundle size analysis for multiple build tools (Webpack, Vite, Rollup, Next.js, Rust) with automatic build output detection, asset size breakdown by file type (JavaScript, CSS, images, fonts), performance impact assessment with configurable size thresholds, timestamped bundle reports with historical tracking, bundle optimization recommendations including code splitting and compression suggestions, Gzip and Brotli compression analysis with compression ratio calculations, and tree-shaking effectiveness measurement. The hook automatically detects build output directories (dist, build, out, .next, public, www, target/release), analyzes file types and sizes, provides framework-specific recommendations, and generates detailed reports for performance budget monitoring and CI/CD pipeline validation.

Automatically commits all changes with a summary when Claude Code session ends. This Stop hook provides comprehensive Git automation for development sessions with automatic commit creation when session ends, detailed commit statistics (files changed, insertions, deletions) with accurate line count calculations, smart commit message generation with timestamps and session summaries, pre-commit validation and safety checks including sensitive file detection (.env, secrets, keys), branch and repository state verification with Git configuration validation, customizable commit message templates with environment variable overrides, untracked file handling and gitignore respect with .gitignore validation, and error handling with informative feedback including commit failure recovery. The hook automatically detects uncommitted changes, validates Git configuration, checks for sensitive files, stages all changes respecting .gitignore, generates detailed commit messages with statistics, and optionally pushes to remote repositories. Supports environment variables (SKIP_AUTO_COMMIT, AUTO_PUSH) for flexible control and provides comprehensive commit summaries for session tracking and progress documentation.

Prevents direct edits to protected branches like main or master, enforcing PR-based workflows. This PreToolUse hook provides comprehensive branch protection for Git repositories with protection of critical branches (main, master, production, release, staging, develop) with configurable protected branch patterns, configurable protected branch patterns including wildcard patterns (release/*, hotfix/*, support/*) and environment variable customization, clear error messages with actionable guidance including suggested branch names, feature branch creation commands, and workflow recommendations, feature branch creation suggestions based on file names being edited with sanitized branch name generation, integration with CI/CD workflow enforcement preventing direct commits that bypass CI/CD pipelines, override capability for emergency changes with FORCE_ALLOW_PROTECTED_EDIT environment variable and safety warnings, branch naming convention validation with pattern matching for feature/*, bugfix/*, hotfix/* branches, and repository safety and collaboration enforcement with detailed protection violation messages and workflow guidance. The hook automatically detects the current Git branch, validates against protected branch lists and patterns, provides actionable error messages with suggested workflows, and optionally allows emergency overrides while maintaining repository safety and code quality standards.

Comprehensive pre-commit hook that validates code quality, runs tests, and enforces standards. This PreToolUse hook provides comprehensive pre-commit validation for Git repositories with code quality validation using linting (ESLint, Prettier, RuboCop, Black) and formatting checks, security scanning for secrets and vulnerabilities with pattern matching for API keys, passwords, tokens, and certificates, automated test execution before commits with support for multiple test frameworks (Jest, Mocha, pytest, RSpec), file validation and size limits with configurable file size thresholds and forbidden file detection (.env, .DS_Store, node_modules), commit message format enforcement with conventional commit message validation and pattern matching, support for multiple programming languages (JavaScript, TypeScript, Python, Ruby, Go, Rust) with language-specific validation tools, and integration with popular pre-commit frameworks (pre-commit, husky, lint-staged) with configuration file support. The hook automatically detects staged files, runs appropriate validation tools based on file types, provides actionable error messages, and optionally auto-fixes formatting issues before blocking commits.

Automated accessibility testing and compliance checking for web applications following WCAG 2.1 and WCAG 2.2 guidelines. This hook automatically runs accessibility scans on HTML files after they are written or edited, using axe-core for comprehensive WCAG compliance testing. Features include automated violation detection, color contrast analysis, keyboard navigation testing, screen reader compatibility checks, and comprehensive accessibility reporting. The hook integrates seamlessly into development workflows, providing real-time accessibility feedback during development and ensuring WCAG compliance before deployment. Supports both advanced axe-core scanning and fallback basic checks for environments without axe-core installed.

Automatically generates or updates API documentation when endpoint files are modified, supporting OpenAPI 3.1.0, Swagger 2.0, and AsyncAPI 2.0 specifications. This hook automatically detects changes to API route files (JavaScript, TypeScript, Python) and generates comprehensive documentation using swagger-jsdoc (v6+), JSDoc, or FastAPI's built-in OpenAPI generation. Features include real-time documentation synchronization, multi-format output (JSON, YAML, Markdown), automatic endpoint discovery, parameter and response type extraction, and integration with Swagger UI and ReDoc for interactive documentation. The hook supports both annotation-based documentation (JSDoc comments) and automatic schema inference (FastAPI), ensuring API documentation stays synchronized with code changes throughout the development lifecycle.

Automatically formats code files after Claude writes or edits them using industry-standard formatters including Prettier 3.6.2+ (JavaScript/TypeScript/Web), Black or Ruff (Python), gofmt (Go), and rustfmt (Rust). This hook automatically detects file types and applies appropriate formatting rules, ensuring consistent code style across team projects without manual intervention. Features include language-specific formatting rules, automatic formatter detection, configurable timeout and error handling, preservation of file permissions and structure, and silent operation with optional feedback. The hook supports multiple programming languages in the same project, automatically fixes formatting issues after AI code generation, and reduces code review friction by handling formatting automatically. Supports both traditional formatters (Prettier, Black) and modern high-performance alternatives (Ruff for Python, which is 10-100x faster than Black while maintaining Black-compatible formatting).

Automatically creates timestamped backups of files before modification to prevent data loss. This hook runs before file editing operations (Edit, Write, Multiedit) and creates versioned backups in a centralized .backups directory with ISO 8601-compliant timestamps including nanoseconds for collision prevention. Features include automatic backup creation before any file modification, organized backup storage with configurable retention policies, support for all file editing operations including bulk operations, version history maintenance with automatic cleanup, and silent failure handling to prevent workflow interruption. The hook implements best practices including disk space management, backup rotation policies, and efficient file copying to ensure reliable data protection without impacting development workflow performance.

Validates AWS CloudFormation templates for syntax errors and best practices using cfn-lint v1.40.4+ and AWS CLI v2.27.54+. This hook automatically detects CloudFormation template files (JSON, YAML) and runs comprehensive validation including syntax error detection, AWS best practices compliance checking, type mismatch validation, resource property validation, and SAM template support. Features include advanced CloudFormation template validation with cfn-lint supporting multi-region validation, custom rules, and comprehensive error reporting. The hook provides fallback to AWS CLI validation when cfn-lint is unavailable, ensuring validation works in all environments. Supports both JSON and YAML template formats, automatically transforms SAM templates to CloudFormation for validation, and integrates seamlessly into development workflows and CI/CD pipelines for infrastructure as code quality assurance.

Automatically backs up changed files to cloud storage when Claude Code session ends using AWS S3, Google Cloud Storage, or rclone for universal cloud provider support. This hook runs on session stop and intelligently identifies modified files using git diff, creates timestamped backup archives, and uploads them to configured cloud storage providers. Features include automatic cloud backup when Claude session ends, support for multiple cloud providers (AWS S3, Google Cloud Storage, rclone for 40+ providers), intelligent file selection using git diff to track only changed files, timestamped backup archives with ISO 8601 format, fallback to rclone for universal cloud support, and environment variable configuration for security. The hook implements best practices including incremental backups, compression for efficient storage, error handling with graceful fallbacks, and secure credential management using environment variables.

Alerts when code complexity exceeds thresholds in real-time using cyclomatic complexity analysis, line count monitoring, function count analysis, and nesting level detection. This hook runs on file write operations and analyzes JavaScript, TypeScript, and Python code to detect maintainability issues before they become technical debt. Features include real-time complexity monitoring for JavaScript, TypeScript, and Python using pattern matching and AST-based analysis, configurable line count thresholds (default: 500 lines) with customizable warning and error levels, function count analysis and alerting to detect over-modularization or under-modularization, nesting level detection for code structure using brace counting and indentation depth analysis, instant feedback on code maintainability issues with severity levels (INFO, WARNING, ERROR), multi-language support with pattern matching for .js, .jsx, .ts, .tsx, and .py files, cyclomatic complexity estimation using control flow analysis, and integration with ESLint complexity rules (max-complexity) and Radon for Python for comprehensive analysis.

Automatically run relevant tests when code changes are detected using intelligent test selection, parallel execution, and multi-framework support. This hook runs on file write/edit operations and automatically identifies and executes tests related to changed files using dependency analysis, test file pattern matching, and framework-specific test discovery. Features include intelligent test selection based on code changes using Jest --findRelatedTests, Vitest test selection patterns, and pytest test discovery, parallel test execution for faster feedback using Jest workers, Vitest concurrent tests, and pytest-xdist, support for multiple testing frameworks including Jest v29.7.0+, Vitest v4.0.7+, pytest 9.0.0+, Go testing, Maven, and Gradle, fail-fast mode for quick feedback stopping on first failure, smart retry for flaky tests with configurable retry counts, impact analysis and dependency mapping to find tests affected by code changes, and integration with CI/CD pipelines for automated testing workflows.

Detects unused CSS selectors when stylesheets are modified to keep CSS lean using PurgeCSS, PostCSS, and content analysis. This hook runs on CSS/SCSS file write/edit operations and automatically analyzes stylesheets to identify unused selectors, generate optimized CSS output, and provide before/after comparison metrics. Features include automatic unused CSS selector detection with PurgeCSS ^6.0.0+ for comprehensive content scanning, support for CSS, SCSS, SASS, and modern CSS frameworks (Tailwind CSS, Bootstrap, Material UI), content analysis across HTML, JS, JSX, TS, TSX, Vue, and Svelte files using multiple content path patterns, before/after comparison with line count reduction and byte size savings calculation, optimized CSS output generation with safelist support for critical framework classes, integration with modern build workflows supporting Vite, Webpack, Rollup, and PostCSS pipelines, safelist configuration to protect dynamically-generated classes and framework utilities, and detailed reporting with percentage reduction metrics and file size savings.

Closes all database connections and cleans up resources when Claude Code session ends using PostgreSQL pg_terminate_backend, MySQL KILL, MongoDB connection management, and Redis CLIENT KILL commands. This hook runs on session stop and automatically identifies active database connections, terminates idle connections exceeding timeout thresholds, monitors connection counts, and reports resource usage. Features include automatic database connection cleanup on session end using Stop hook with intelligent connection detection, multi-database support for PostgreSQL 17+, MySQL 8.0+, MongoDB 7.0+ (mongosh), and Redis 7.0+ with automatic database type detection, idle connection termination for PostgreSQL using pg_terminate_backend with configurable timeout thresholds (default: 5 minutes), connection monitoring and reporting showing active, idle, and total connection counts for each database type, safe cleanup with error handling preventing accidental termination of critical connections, resource leak prevention automatically closing orphaned connections and cleaning up connection pools, connection string detection from environment variables (.env files) for automatic database discovery, and detailed reporting with connection statistics and cleanup results for each database type.

Automated database migration management with rollback capabilities, validation, and multi-environment support using Knex 3.x, Sequelize 6.x/7.x, TypeORM 0.3.x, Django 5.x, and Rails 7.x. This PostToolUse hook automatically detects migration-related files when created or edited, identifies the migration framework in use, checks migration status, validates migration files for potentially destructive operations, and provides framework-specific guidance. Features include automated database migration detection and execution with intelligent framework detection, support for multiple database systems (PostgreSQL, MySQL, SQLite, SQL Server) across all major migration frameworks, safe rollback capabilities with validation and transaction support, migration file integrity checking with checksums and validation, environment-specific migration configurations for development, staging, and production, CI/CD pipeline integration with automated migration execution, destructive operation detection warning about DROP/DELETE/TRUNCATE statements, and migration best practices reminders including backup recommendations and testing guidelines.

Monitors and logs database query performance metrics with slow query detection, N+1 analysis, and optimization suggestions using PostgreSQL pg_stat_statements, Prisma query logging, Sequelize query logging, TypeORM query logging, and Bullet N+1 detection patterns. This PostToolUse hook automatically detects database query files and commands, analyzes query patterns for performance issues, identifies N+1 query problems, detects slow queries exceeding configurable thresholds, monitors database connection pools, provides query plan analysis and optimization hints, and logs performance metrics for historical analysis. Features include automatic slow query detection and alerting with configurable thresholds (default: 1000ms), N+1 query pattern identification detecting loops with database queries and suggesting eager loading, query execution time tracking and statistics with detailed performance metrics, database connection pool monitoring tracking active connections and pool utilization, query plan analysis and optimization hints using EXPLAIN/ANALYZE for PostgreSQL, support for PostgreSQL 17+ (pg_stat_statements), MySQL 8.0+, SQLite query logs, Prisma 5.x query logging, Sequelize 6.x/7.x query logging, and TypeORM 0.3.x query logging, SELECT * pattern detection warning about unnecessary data transfer, missing LIMIT clause detection preventing unbounded result sets, and unindexed WHERE clause detection suggesting index creation.

Automatically detects and removes unused code, imports, and dependencies with safe deletion verification and rollback support using Knip 5.x, ts-prune, depcheck, autoflake, Vulture, and ESLint 9.37.0. This SessionEnd hook runs when Claude Code session ends and automatically analyzes the codebase for unused imports, dead code paths, unreferenced functions and variables, orphaned test files, unused dependencies, and zero-coverage files. Features include unused import detection and removal across multiple languages (JavaScript/TypeScript, Python, and more), dead code path identification using static analysis and AST parsing, unreferenced function and variable detection with confidence scoring, orphaned test file cleanup with verification and safety checks, safe deletion with backup and rollback capabilities creating timestamped backups before removal, bundle size impact analysis after cleanup showing size reduction metrics, coverage-based dead code detection identifying zero-coverage files as potential dead code, and multi-language support for JavaScript/TypeScript (Knip 5.x, ts-prune, ESLint 9.37.0), Python (autoflake, Vulture), and dependency analysis (depcheck).

Performs a comprehensive security audit of all dependencies when Claude Code session ends using npm audit (npm 10.x+), yarn audit (Yarn 4.x+), pip-audit 2.7.x+, safety, bundler-audit, and OWASP dep-scan. This Stop hook automatically detects package managers, runs security vulnerability scans, identifies outdated packages, generates detailed audit reports, and provides remediation recommendations. Features include comprehensive security audit for multiple package managers (npm, Yarn, pnpm, pip, Poetry, bundler) with automatic detection, support for NPM 10.x+, Yarn 4.x+, Python (pip-audit 2.7.x+, safety), and Ruby (bundler-audit) dependency scanning, vulnerability detection with severity levels (critical, high, moderate, low) and CVSS scores, outdated package identification showing current vs latest versions with update recommendations, detailed audit report generation with timestamped logs and vulnerability details, integration with popular security tools (npm audit, pip-audit, safety, bundler-audit, OWASP dep-scan), SBOM (Software Bill of Materials) generation support for compliance and supply chain security, and automated remediation suggestions with fix commands and version recommendations.

Real-time vulnerability scanning for dependencies with automated CVE detection, severity assessment, and patch recommendations. This PostToolUse hook automatically triggers security scans when dependency manifest files (package.json, requirements.txt, Cargo.toml, go.mod, Gemfile, composer.json) are modified. Supports npm audit (npm 10.x+), yarn audit (Yarn 4.x+), pip-audit 2.9.0+, safety, cargo-audit, govulncheck, and bundler-audit with real-time CVE database integration, severity-based alerting (critical, high, medium, low), automatic patch version recommendations, license compliance checking, and supply chain security validation. Features include automated vulnerability scanning on dependency file changes with PostToolUse hook integration, CVE database integration for real-time threat detection using official vulnerability databases, severity-based alerting (critical, high, medium, low) with CVSS scores and detailed vulnerability descriptions, automatic patch version recommendations with fix commands and compatibility checks, support for npm 10.x+, yarn 4.x+, pip-audit 2.9.0+, safety, cargo-audit, govulncheck, bundler-audit, and composer audit, license compliance checking and risk assessment with license type detection, and supply chain security validation with SBOM generation support.

Automatically checks for outdated dependencies and suggests updates with security analysis. This PostToolUse hook triggers when dependency manifest files (package.json, requirements.txt, Gemfile, go.mod, Cargo.toml, pyproject.toml) are modified, providing real-time dependency health monitoring. Supports npm-check-updates (ncu), npm outdated, pip-audit 2.9.0+, safety, cargo-outdated, cargo-audit, govulncheck, and bundler-audit with categorized update recommendations (critical, major, minor, patch), breaking change warnings for major version updates, security vulnerability detection integrated with dependency updates, multi-language support (Node.js, Python, Ruby, Go, Rust), and detailed update strategy guidance with changelog references.

Sends development activity updates to Discord channel for team collaboration. This Notification hook automatically sends rich embed messages to Discord webhooks when Claude Code activities occur, providing real-time team visibility into development workflows. Features include real-time Discord notifications for Claude Code activities (tool usage, file operations, errors), rich embed messages with file information, timestamps, Git branch/commit details, and file type icons, dynamic color coding based on action types (success: green, error: red, warning: yellow, edit/write: purple), team collaboration and activity visibility with configurable webhook integration, silent operation with fallback error handling and rate limiting support, Discord webhook API integration using curl with proper JSON formatting, and embed customization with fields, footers, and timestamps following Discord embed specifications.

Automatically rebuilds Docker containers when Dockerfile or docker-compose.yml files are modified. This PostToolUse hook triggers automatic Docker image rebuilding when Docker-related files (Dockerfile, docker-compose.yml, .dockerignore) are modified, providing real-time container synchronization during development. Supports Docker Engine 24.0+, Docker Compose v2 (docker compose), BuildKit for faster builds, multi-stage builds, layer caching optimization, and intelligent file detection for Docker-related configurations. Features include automatic Docker image rebuilding on Dockerfile changes with BuildKit support and layer caching, Docker Compose v2 service rebuilding for compose file updates with dependency resolution, intelligent file detection for Docker-related configurations (Dockerfile, docker-compose.yml, .dockerignore, .dockerfile), support for multiple Docker file patterns and variations with explicit Dockerfile path specification, build status reporting and error handling with detailed build output and image information, development environment synchronization with automatic container updates, BuildKit integration for faster builds with cache mount support, and .dockerignore optimization for reduced build context size.

Comprehensive Docker image vulnerability scanning with layer analysis, base image recommendations, and security best practices enforcement. This PostToolUse hook automatically scans Docker images for vulnerabilities when Dockerfiles are modified, providing real-time security validation during development. Supports Trivy 0.52.0+, Grype, Docker Scout (Docker Desktop 4.17+), SBOM generation, VEX (Vulnerability Exploitability eXchange) support, and comprehensive security best practices validation. Features include automated vulnerability scanning on Dockerfile changes with real-time security validation, Docker image layer-by-layer security analysis with detailed vulnerability reporting, base image vulnerability detection and recommendations with alternative base image suggestions, malware and rootkit scanning in container images using Trivy and Grype, security best practices validation (non-root user, minimal layers, version pinning, secrets detection), and integration with Trivy 0.52.0+, Grype, and Docker Scout for comprehensive vulnerability coverage.

Automatically generates or updates project documentation when session ends. This Stop hook provides comprehensive documentation generation for multiple programming languages and frameworks, supporting TypeDoc 0.26.0+ for TypeScript, JSDoc 4.0.0+ for JavaScript, Sphinx 7.0+ and pdoc 14.0+ for Python, Go doc/godoc for Go projects, and Cargo doc for Rust projects. Features include automatic API documentation generation with multi-language support, changelog updates with session summaries, project structure analysis and documentation, README file updates and maintenance, multi-format output (HTML, Markdown, PDF), and comprehensive documentation index generation. The hook automatically detects project type and uses appropriate documentation generators, ensuring documentation stays up-to-date with code changes.

Automated documentation coverage analysis with missing docstring detection, API documentation validation, and completeness scoring. This PostToolUse hook automatically checks documentation coverage when code files are modified, providing real-time documentation quality validation during development. Supports JSDoc 4.0.0+, TSDoc (Microsoft specification), Python docstring validation with interrogate, Go documentation checking, API endpoint documentation validation with OpenAPI/Swagger, and comprehensive documentation coverage metrics and reporting. Features include automatic detection of undocumented functions and classes, multi-language documentation validation (JavaScript, TypeScript, Python, Go, Rust), API endpoint documentation completeness checking, documentation coverage metrics and reporting with threshold enforcement, README and changelog freshness validation, and support for multiple languages and documentation formats.

Automatically generates and updates project documentation from code comments, README files, and API definitions. This PostToolUse hook provides real-time documentation generation when code files are modified, supporting multiple programming languages and documentation formats. Features include real-time documentation generation from code comments with automatic detection of JSDoc, TSDoc, Python docstrings, Go comments, and Rust documentation comments, multi-language support (JavaScript, TypeScript, Python, Go, Rust) with appropriate documentation generators (JSDoc 4.0.0+, TypeDoc 0.26.0+, pdoc 14.0+, Go doc, Cargo doc), API documentation extraction from JSDoc, docstrings, and comments with automatic API endpoint detection and documentation, README.md analysis and improvement suggestions with completeness checking and metadata validation, documentation quality and completeness checking with coverage metrics, and integration with popular documentation tools including jsdoc2md for markdown output.

Cleans up temporary files, caches, and resources when Claude session ends. This Stop hook provides comprehensive environment cleanup for development projects, automatically removing temporary files, build artifacts, cache directories, and system-specific files across multiple platforms. Features include automatic temporary file cleanup (*.tmp, *.log, .DS_Store, Thumbs.db) with cross-platform support, NPM cache verification and cleanup with npm 10.x+ support, Python bytecode and __pycache__ directory removal with Python 3.12+ support, development build artifacts cleanup including object files and shared libraries, disk space usage reporting and optimization with detailed cache size reporting, multi-platform support (macOS, Linux, Windows) with platform-specific cleanup rules, safe cleanup with error handling and logging, and cache invalidation for faster future builds. The hook automatically detects project type and cleans up language-specific artifacts, ensuring development environments remain clean and optimized.

Validates environment variables, checks for required vars, and ensures proper configuration across environments. This PostToolUse hook provides comprehensive environment variable validation when .env files, docker-compose files, or configuration files are modified, ensuring secure and consistent configuration across development, staging, and production environments. Features include automatic validation when .env files are modified with real-time validation feedback, required environment variable checking with cross-environment consistency validation, security validation for insecure defaults and weak secrets with minimum length requirements (16+ characters for secrets, 32+ for JWT/encryption keys), format validation for URLs, emails, ports, and booleans with comprehensive type checking, cross-environment consistency checking comparing .env, .env.local, .env.development, .env.staging, and .env.production files, production vs development environment validation with environment-specific security rules, configuration schema validation with Docker Compose environment variable validation, and comprehensive error reporting and security warnings with detailed validation summaries.

Tracks error patterns and alerts when error rates spike. This Notification hook provides comprehensive error rate monitoring across log files, Docker containers, and application logs, automatically detecting error patterns and alerting when error rates exceed configurable thresholds. Features include real-time error pattern detection in log files with automatic log file discovery across standard and framework-specific locations, configurable error rate thresholds and alerting with environment variable configuration, multi-log file monitoring (*.log, logs/*, custom paths) with recursive directory scanning, error severity classification (fatal, error, warning) with pattern-based severity detection, recent error sample display for quick debugging with truncated error messages, time-based error rate calculations with configurable time windows, framework-specific error pattern recognition for Node.js, Python, Next.js, and Docker applications, and silent operation with threshold-based notifications. The hook automatically discovers log files in common locations and monitors Docker container logs when Docker is available, providing comprehensive error monitoring across development environments.

Alerts when files exceed size thresholds that could impact performance. This PostToolUse hook provides comprehensive file size monitoring when files are created or modified, automatically detecting files that exceed recommended size thresholds for different file types and providing optimization suggestions. Features include real-time file size monitoring during write/edit operations with automatic file size detection across platforms, configurable size thresholds for different file types (source code 500KB, images 2MB, videos 50MB, JSON 1MB) with environment variable overrides, file type-specific recommendations (images, JSON, code, etc.) with optimization suggestions for each file type, performance impact warnings for large files with impact assessment (high/medium/low), Git repository size impact analysis with size change tracking and Git LFS recommendations, compression suggestions for media files including JPEG optimization, WebP format, and video compression, size comparison with previous versions using Git history to track file size growth, and multi-platform file size detection (macOS, Linux, Windows) with cross-platform stat command compatibility. The hook automatically detects file types and provides appropriate optimization suggestions, helping maintain optimal file sizes for performance and repository health.

Analyzes and reports final bundle sizes when the development session ends. This Stop hook provides comprehensive bundle size analysis for multiple build tools (Webpack, Vite, Rollup, Next.js, Rust) with automatic build output detection, asset size breakdown by file type (JavaScript, CSS, images, fonts), performance impact assessment with configurable size thresholds, timestamped bundle reports with historical tracking, bundle optimization recommendations including code splitting and compression suggestions, Gzip and Brotli compression analysis with compression ratio calculations, and tree-shaking effectiveness measurement. The hook automatically detects build output directories (dist, build, out, .next, public, www, target/release), analyzes file types and sizes, provides framework-specific recommendations, and generates detailed reports for performance budget monitoring and CI/CD pipeline validation.

Automatically commits all changes with a summary when Claude Code session ends. This Stop hook provides comprehensive Git automation for development sessions with automatic commit creation when session ends, detailed commit statistics (files changed, insertions, deletions) with accurate line count calculations, smart commit message generation with timestamps and session summaries, pre-commit validation and safety checks including sensitive file detection (.env, secrets, keys), branch and repository state verification with Git configuration validation, customizable commit message templates with environment variable overrides, untracked file handling and gitignore respect with .gitignore validation, and error handling with informative feedback including commit failure recovery. The hook automatically detects uncommitted changes, validates Git configuration, checks for sensitive files, stages all changes respecting .gitignore, generates detailed commit messages with statistics, and optionally pushes to remote repositories. Supports environment variables (SKIP_AUTO_COMMIT, AUTO_PUSH) for flexible control and provides comprehensive commit summaries for session tracking and progress documentation.

Prevents direct edits to protected branches like main or master, enforcing PR-based workflows. This PreToolUse hook provides comprehensive branch protection for Git repositories with protection of critical branches (main, master, production, release, staging, develop) with configurable protected branch patterns, configurable protected branch patterns including wildcard patterns (release/*, hotfix/*, support/*) and environment variable customization, clear error messages with actionable guidance including suggested branch names, feature branch creation commands, and workflow recommendations, feature branch creation suggestions based on file names being edited with sanitized branch name generation, integration with CI/CD workflow enforcement preventing direct commits that bypass CI/CD pipelines, override capability for emergency changes with FORCE_ALLOW_PROTECTED_EDIT environment variable and safety warnings, branch naming convention validation with pattern matching for feature/*, bugfix/*, hotfix/* branches, and repository safety and collaboration enforcement with detailed protection violation messages and workflow guidance. The hook automatically detects the current Git branch, validates against protected branch lists and patterns, provides actionable error messages with suggested workflows, and optionally allows emergency overrides while maintaining repository safety and code quality standards.

Comprehensive pre-commit hook that validates code quality, runs tests, and enforces standards. This PreToolUse hook provides comprehensive pre-commit validation for Git repositories with code quality validation using linting (ESLint, Prettier, RuboCop, Black) and formatting checks, security scanning for secrets and vulnerabilities with pattern matching for API keys, passwords, tokens, and certificates, automated test execution before commits with support for multiple test frameworks (Jest, Mocha, pytest, RSpec), file validation and size limits with configurable file size thresholds and forbidden file detection (.env, .DS_Store, node_modules), commit message format enforcement with conventional commit message validation and pattern matching, support for multiple programming languages (JavaScript, TypeScript, Python, Ruby, Go, Rust) with language-specific validation tools, and integration with popular pre-commit frameworks (pre-commit, husky, lint-staged) with configuration file support. The hook automatically detects staged files, runs appropriate validation tools based on file types, provides actionable error messages, and optionally auto-fixes formatting issues before blocking commits.