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#!/bin/bash # Cost Alert Monitor Hook # Tracks token usage and alerts on budget thresholds COST_FILE="${HOME}/.claude/cost-tracker.json" DAILY_BUDGET=5.00 # USD ALERT_THRESHOLDS="0.50 0.75 0.90" # Initialize cost file if missing if [ ! -f "$COST_FILE" ]; then echo '{"date":"","input_tokens":0,"output_tokens":0,"alerts_sent":[]}' > "$COST_FILE" fi TODAY=$(date +%Y-%m-%d) CURRENT_DATE=$(jq -r '.date' "$COST_FILE") # Reset daily counters if new day if [ "$TODAY" != "$CURRENT_DATE" ]; then echo "{"date":"$TODAY","input_tokens":0,"output_tokens":0,"alerts_sent":[]}" > "$COST_FILE" fi # Parse token counts from notification INPUT_TOKENS=$(echo "$NOTIFICATION_DATA" | jq -r '.input_tokens // 0') OUTPUT_TOKENS=$(echo "$NOTIFICATION_DATA" | jq -r '.output_tokens // 0') # Update cumulative counts jq --argjson inp "$INPUT_TOKENS" --argjson out "$OUTPUT_TOKENS" '.input_tokens += $inp | .output_tokens += $out' "$COST_FILE" > "$COST_FILE.tmp" && mv "$COST_FILE.tmp" "$COST_FILE" # Calculate estimated cost (Claude Sonnet pricing) TOTAL_INPUT=$(jq '.input_tokens' "$COST_FILE") TOTAL_OUTPUT=$(jq '.output_tokens' "$COST_FILE") COST=$(echo "scale=4; $TOTAL_INPUT * 0.000003 + $TOTAL_OUTPUT * 0.000015" | bc) RATIO=$(echo "scale=4; $COST / $DAILY_BUDGET" | bc) # Check thresholds for THRESHOLD in $ALERT_THRESHOLDS; do ALREADY=$(jq -r --arg t "$THRESHOLD" '.alerts_sent | index($t) // empty' "$COST_FILE") if [ -z "$ALREADY" ] && [ "$(echo "$RATIO >= $THRESHOLD" | bc)" -eq 1 ]; then PCT=$(echo "scale=0; $THRESHOLD * 100 / 1" | bc) echo "COST ALERT: ${PCT}% of daily budget reached ($$COST / $$DAILY_BUDGET)" echo " Input: $TOTAL_INPUT tokens | Output: $TOTAL_OUTPUT tokens" jq --arg t "$THRESHOLD" '.alerts_sent += [$t]' "$COST_FILE" > "$COST_FILE.tmp" && mv "$COST_FILE.tmp" "$COST_FILE" fi done exit 0