#!/bin/bash
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# Self-Improvement Error Detector Hook
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# Triggers on PostToolUse for Bash to detect command failures
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# Reads CLAUDE_TOOL_OUTPUT environment variable
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set -e
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# Check if tool output indicates an error
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# CLAUDE_TOOL_OUTPUT contains the result of the tool execution
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OUTPUT="${CLAUDE_TOOL_OUTPUT:-}"
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# Patterns indicating errors (case-insensitive matching)
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ERROR_PATTERNS=(
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"error:"
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"Error:"
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"ERROR:"
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"failed"
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"FAILED"
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"command not found"
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"No such file"
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"Permission denied"
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"fatal:"
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"Exception"
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"Traceback"
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"npm ERR!"
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"ModuleNotFoundError"
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"SyntaxError"
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"TypeError"
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"exit code"
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"non-zero"
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)
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# Check if output contains any error pattern
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contains_error=false
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for pattern in "${ERROR_PATTERNS[@]}"; do
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if [[ "$OUTPUT" == *"$pattern"* ]]; then
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contains_error=true
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break
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fi
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done
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# Only output reminder if error detected
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if [ "$contains_error" = true ]; then
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cat << 'EOF'
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<error-detected>
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A command error was detected. Consider logging this to .learnings/ERRORS.md if:
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- The error was unexpected or non-obvious
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- It required investigation to resolve
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- It might recur in similar contexts
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- The solution could benefit future sessions
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Use the self-improvement skill format: [ERR-YYYYMMDD-XXX]
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</error-detected>
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EOF
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fi
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