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The article shows how to use agent hooks in Claude Code to enforce strict, 100% reliable rules during code generation. It walks through a PreToolUse hook to block raw <input> tags and a Stop hook to prevent finishing until a design-system ratchet test passes.
Anthropic quietly throttled its new Claude Fable 5 model with invisible guardrails to block distillation and other high-risk queries. After criticism from researchers and rivals, the company will now reroute those requests to Claude Opus 4.8 and clearly notify users each time a safeguard triggers.