Configure Claude Code hooks for lifecycle automation with JSON-based I/O.
npx skills add https://github.com/bsamiee/Parametric_Portal --skill hooks-builder
Please help me install this Agent Skill. Skill: hooks-builder Source: https://github.com/bsamiee/Parametric_Portal/tree/main/.claude/skills/hooks-builder Command: npx skills add https://github.com/bsamiee/Parametric_Portal --skill hooks-builder
This Skill provides deterministic control over Claude's behavior at various lifecycle events, eliminating manual interventions and ensuring consistent, automated responses. It saves time by automating validation, formatting, and decision-making processes.
command hooks for deterministic actions (validation, formatting) or prompt hooks for LLM-evaluated decisions.PreToolUse hook to automatically validate all Write tool calls against a security policy, blocking any attempts to modify sensitive files without explicit approval.Use the hooks-builder skill to create a PreToolUse hook that validates tool inputs before execution, blocking any unsafe commands based on predefined patterns.
High-intent search queries and answers about installing and using this skill.
Lifecycle hooks enable deterministic automation by intercepting tool invocations at predefined events. Configure a PreToolUse hook with Python validation logic to block unsafe commands before Claude executes them, eliminating manual approval workflows.
hooks-builder supports 10 agent lifecycle events including PreToolUse, PostToolUse, PermissionRequest, and SessionStart. Each hook type accepts command scripts for deterministic actions or prompt hooks for LLM-evaluated decisions, enabling control across the entire agent lifecycle.
Yes, matchers filter hook execution based on specific tool invocations or session events. This lets you apply validation, formatting, or approval logic selectively—for example, blocking only Write operations to sensitive files while allowing others.
Define hooks in local, project, or user settings.json with JSON-based I/O specifying event type, matcher rules, and script path. hooks-builder handles exit-code semantics (block on 2, continue on 0), environment variables, timeout handling, and security constraints like shell=False.
Hook scripts run with strict functional and security-first design: shell=False prevents shell injection, realpath checks validate file access, and typed enforcement ensures deterministic behavior. Python 3.14+ scripts execute in isolation with explicit permission boundaries.
Yes, hooks support context propagation across lifecycle events for session management and custom notifications. This enables stateful automation workflows where decisions made in one hook inform actions in subsequent hooks within the same session.
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