Claude Code Hooks & CLAUDE.md: Automate Your Dev Workflow with Lifecycle Events
Claude Code hooks let you attach shell commands to coding events—like auto-formatting files with Prettier every time Claude edits them—without any manual intervention. CLAUDE.md is a special project file that feeds Claude your codebase rules, build commands, and conventions upfront so it stops asking redundant questions. Together, these two features turn Claude Code from a reactive assistant into a self-disciplined automated dev pipeline.
MISSION OBJECTIVES
- 01Create a `.claude/` directory in your project root and add a `settings.json` file with a Prettier hook using the exact config snippet below, then run any Claude edit command to confirm auto-formatting fires on save.
- 02Write a CLAUDE.md file in your project root listing your build command, linter setup, preferred naming conventions, and folder structure—keep it under 200 lines so Claude loads it every session without truncation.
- 03Add a second hook entry with a `matcher` of `PostToolUse` and a command that runs `tsc --noEmit` to catch TypeScript errors automatically after every Claude-generated code change.
CODE INTELLIGENCE
{
"hooks": [
{
"matcher": "Edit|Write",
"hooks": [
{
"type": "command",
"command": "prettier --write \"$CLAUDE_FILE_PATHS\""
}
]
}
]
}FIELD OPERATIONS
Automated Code Quality Gate for Claude Edits
Build a hooks configuration that chains three sequential commands on every Edit or Write event: Prettier formatting, ESLint auto-fix, and a Jest test run scoped to the changed file. Any non-zero exit code blocks Claude from proceeding, creating a local CI-like gate with zero extra tooling.
Dangerous Command Blocker with Audit Log
Use a PreToolUse hook with a bash script that intercepts shell commands matching patterns like `rm -rf`, `DROP TABLE`, or `git push --force`, writes them to a local audit.log with a timestamp, and exits with code 1 to block execution—giving teams a lightweight safety net for AI-assisted ops work.
STRATEGIC APPLICATIONS
- →A software agency onboarding a new client project can drop a CLAUDE.md with the client's coding standards and a hooks config enforcing their linter on every AI edit, ensuring all Claude-generated code is compliant before it ever reaches code review.
- →A solo SaaS founder using Claude Code for rapid feature development can set up PostToolUse hooks that auto-run integration tests against a local database after every file write, catching regressions in seconds rather than discovering them in production.