Stop asking your AI agent to follow rules. Enforce them.

7.6 relevance

Practical technique to enforce AI coding rules via hooks instead of prompts, highly actionable and relevant.

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Why It Matters

For a platform engineer building agentic SDLC pipelines, this is a concrete pattern to reduce token costs and eliminate prompt-drift for rules that don't need a model's judgment, enabling cheaper model tiering without sacrificing code quality.

Key Takeaways

Implement a PostToolUse hook with exit code 2 to enforce all grep-able coding rules deterministically, then downgrade your coding agent to a cheaper model.

Stop asking your AI agent to follow rules. Enforce them.

Summary

Claude Code hooks with exit code 2 enforce deterministic coding rules via regex checks, bypassing probabilistic LLM adherence. This pattern offloads grep-able rules (e.g., 'use client' in page.tsx) from prompts to a zero-token, model-agnostic reviewer that fires after every edit. The payoff: cheaper models can safely write code once mechanical rules are enforced from below.

Author

Yuiko Koyanagi