Claude Code Hooks: Deterministic Rules for an Agentic Workflow

Claude Code hooks are runtime handlers attached to lifecycle events such as session start, tool use, failures, and turn completion, providing deterministic enforcement that differs from context-dependent instructions in CLAUDE.md. Configured in settings files with matchers and handler types including shell commands, HTTP calls, MCP tools, prompts, and agents, hooks can format changes, block destructive actions, surface real tool errors, or run verification when an agent claims work is complete. Command-hook exit code semantics are especially important: exit code 2 blocks an action and returns standard error to the agent, while most other nonzero codes do not block, requiring wrapper scripts when external tools use different status conventions. Stop hooks can serve as valuable quality gates by running real application or browser checks, but their reliability depends on careful timeout handling, observability, and accurately scoped coverage, since timed-out hooks may fail open and checks only validate the flows they explicitly test. A practical initial setup includes formatting after edits, pre-tool restrictions for destructive commands, failure-error feedback, and a final verification gate, with hook configurations reviewed as repository code.

No tracked trend matches for this post yet.

Use this post, company, and trend context to find content marketing opportunities, perform competitive analysis, or address product feature gaps via the Plushcap MCP server or the Plushcap API.