Anthropic's Claude Code now supports a PreToolUse hook, a script that runs after Claude generates tool parameters but before the tool call executes. This hook allows developers to inspect and control tool usage, enabling them to deny or escalate specific commands. The hook receives JSON input detailing the tool call, including the command and its description, and can respond by printing a JSON deny object or exiting with a specific code to block the action. This feature is particularly useful for preventing risky commands, such as `rm -rf`, by implementing custom blocklists. AI
IMPACT Enhances developer control over AI tool execution, allowing for custom safety and permission logic.
RANK_REASON This is a feature update for a specific tool (Claude Code), not a core model release or significant industry event.
Read on dev.to — Claude Code tag →
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