50 lines
1.2 KiB
Bash
50 lines
1.2 KiB
Bash
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#!/bin/bash
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# PreToolUse hook: Block Bash commands that should use dedicated tools.
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# Runs before every Bash call (main agent + subagents).
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# Exit 0 = allow, Exit 2 = block with message.
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INPUT=$(cat)
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COMMAND=$(echo "$INPUT" | jq -r '.tool_input.command // empty')
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# Strip leading whitespace and env vars (e.g. FOO=bar cat file)
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CLEAN=$(echo "$COMMAND" | sed 's/^[[:space:]]*//' | sed 's/^[A-Za-z_][A-Za-z_0-9]*=[^ ]* *//')
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# Extract the first word (the actual command)
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FIRST=$(echo "$CLEAN" | awk '{print $1}' | sed 's|.*/||')
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case "$FIRST" in
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cat)
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echo "Use the Read tool instead of cat." >&2
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exit 2
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;;
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head|tail)
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echo "Use the Read tool (with offset/limit) instead of $FIRST." >&2
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exit 2
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;;
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ls)
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echo "Use the Glob tool instead of ls." >&2
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exit 2
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;;
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find)
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echo "Use the Glob tool instead of find." >&2
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exit 2
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;;
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grep|rg)
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echo "Use the Grep tool instead of $FIRST." >&2
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exit 2
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;;
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sed|awk)
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echo "Use the Edit tool instead of $FIRST." >&2
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exit 2
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;;
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echo)
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# Block echo used for file writing (echo > file, echo >> file)
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if echo "$COMMAND" | grep -qE '>\s*\S'; then
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echo "Use the Write or Edit tool instead of echo redirection." >&2
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exit 2
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fi
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;;
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esac
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exit 0
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