Use when you want to prevent coverage regressions during development. Activate with /coverage-guard to warn when coverage drops below threshold after code changes.
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Run score Not tested
See how to installReview the instructions the agent will receive before you install.
When activated, checks coverage after test runs and warns if it drops below the configured threshold.
After any test execution (via Bash tool), compares coverage to the threshold in config.json. Warns (doesn't block) if coverage decreased.
/coverage-guard
Edit config.json in this skill directory to set thresholds:
{
"thresholds": {
"statements": 80,
"branches": 70,
"functions": 75,
"lines": 80
},
"coverageCommand": "npx jest --coverage --coverageReporters=json-summary",
"coverageFile": "coverage/coverage-summary.json"
}
{
"hooks": {
"PostToolUse": [
{
"matcher": "Bash",
"hook": ".claude/skills/coverage-guard/scripts/check-coverage.sh",
"condition": "command contains 'jest' OR command contains 'vitest' OR command contains 'npm test'"
}
]
}
}
#!/bin/bash
# check-coverage.sh
COVERAGE_FILE="coverage/coverage-summary.json"
THRESHOLD=80
if [ -f "$COVERAGE_FILE" ]; then
STATEMENTS=$(jq '.total.statements.pct' "$COVERAGE_FILE")
BRANCHES=$(jq '.total.branches.pct' "$COVERAGE_FILE")
if (( $(echo "$STATEMENTS < $THRESHOLD" | bc -l) )); then
echo "WARNING: Statement coverage ($STATEMENTS%) below threshold ($THRESHOLD%)"
echo "Coverage dropped — check which files lost coverage."
fi
if (( $(echo "$BRANCHES < 70" | bc -l) )); then
echo "WARNING: Branch coverage ($BRANCHES%) below 70%"
fi
fi
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