diff --git a/scripts/test_coverage.sh b/scripts/test_coverage.sh
index 0c92c75..7696670 100755
--- a/scripts/test_coverage.sh
+++ b/scripts/test_coverage.sh
@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: Apache-2.0
 set -euo pipefail
 
-PROJECT_ROOT=${GITHUB_WORKSPACE:-$(pwd)}
+PROJECT_ROOT=${GITHUB_WORKSPACE:-$(cd "$(dirname "$0")/.." && pwd)}
 COVERAGE_ROOT="$PROJECT_ROOT/dist/coverage"
 LOG_FILE="$COVERAGE_ROOT/test_coverage_log.txt"
 
@@ -22,16 +22,42 @@ fi
 
 export RUSTC_BOOTSTRAP=1
 
+COVERAGE_THRESHOLD=80
+
 echo "📂 Running tarpaulin for workspace" | tee -a "$LOG_FILE"
 mkdir -p "$COVERAGE_ROOT/workspace"
 
-if cargo tarpaulin --workspace --out Html --out Lcov --out Xml \
+TARPAULIN_OUTPUT=$(cargo tarpaulin --packages timpani-n timpani-o --out Html --out Lcov --out Xml \
   --output-dir "$COVERAGE_ROOT/workspace" \
   --ignore-panics --no-fail-fast \
-  2>&1 | tee -a "$LOG_FILE"; then
-  echo "✅ Coverage generated successfully" | tee -a "$LOG_FILE"
+  2>&1) || {
+  echo "$TARPAULIN_OUTPUT" | tee -a "$LOG_FILE"
+  echo "::error ::tarpaulin failed or no tests found" | tee -a "$LOG_FILE"
+  exit 1
+}
+echo "$TARPAULIN_OUTPUT" | tee -a "$LOG_FILE"
+
+echo "✅ Coverage generated successfully" | tee -a "$LOG_FILE"
+
+# Parse the coverage percentage from tarpaulin output (line like "X.XX% coverage")
+COVERAGE=$(echo "$TARPAULIN_OUTPUT" | grep -oP '\d+\.\d+(?=% coverage)' | tail -1)
+
+if [ -z "$COVERAGE" ]; then
+  echo "::error ::Could not parse coverage percentage from tarpaulin output" | tee -a "$LOG_FILE"
+  exit 1
+fi
+
+echo "📊 Measured coverage: ${COVERAGE}%" | tee -a "$LOG_FILE"
+echo "🎯 Required threshold: ${COVERAGE_THRESHOLD}%" | tee -a "$LOG_FILE"
+
+# Compare using awk (bash arithmetic doesn't handle floats)
+PASS=$(awk -v cov="$COVERAGE" -v threshold="$COVERAGE_THRESHOLD" 'BEGIN { print (cov >= threshold) ? "yes" : "no" }')
+
+if [ "$PASS" = "yes" ]; then
+  echo "✅ Coverage check passed: ${COVERAGE}% >= ${COVERAGE_THRESHOLD}%" | tee -a "$LOG_FILE"
 else
-  echo "::warning ::tarpaulin failed or no tests found" | tee -a "$LOG_FILE"
+  echo "::error ::Coverage check FAILED: ${COVERAGE}% is below the required ${COVERAGE_THRESHOLD}% threshold" | tee -a "$LOG_FILE"
+  exit 1
 fi
 
 echo "✅ All test coverage reports generated at: $COVERAGE_ROOT" | tee -a "$LOG_FILE"