diff --git a/hooks/hooks.json b/hooks/hooks.json
index 79d8cee..6797513 100644
--- a/hooks/hooks.json
+++ b/hooks/hooks.json
@@ -7,6 +7,7 @@
           {
             "type": "command",
             "command": "\"${CLAUDE_PLUGIN_ROOT}/hooks/run-hook.cmd\" session-start",
+            "shell": "bash",
             "async": false
           }
         ]
diff --git a/skills/systematic-debugging/find-polluter.sh b/skills/systematic-debugging/find-polluter.sh
index 1d71c56..985f5d0 100755
--- a/skills/systematic-debugging/find-polluter.sh
+++ b/skills/systematic-debugging/find-polluter.sh
@@ -18,9 +18,18 @@ echo "🔍 Searching for test that creates: $POLLUTION_CHECK"
 echo "Test pattern: $TEST_PATTERN"
 echo ""
 
-# Get list of test files
-TEST_FILES=$(find . -path "$TEST_PATTERN" | sort)
-TOTAL=$(echo "$TEST_FILES" | wc -l | tr -d ' ')
+# Get list of test files (find . emits ./-prefixed paths, so accept the
+# pattern written with or without a leading ./)
+TEST_PATTERN="${TEST_PATTERN#./}"
+# find -path can't match '**/' against zero directory levels, so a pattern
+# like src/**/*.test.ts would skip src/top.test.ts; also try the pattern
+# with '**/' collapsed to cover files directly under the base directory.
+TEST_FILES=$(find . \( -path "./$TEST_PATTERN" -o -path "./${TEST_PATTERN//\*\*\//}" \) | sort -u)
+if [ -z "$TEST_FILES" ]; then
+  TOTAL=0
+else
+  TOTAL=$(printf '%s\n' "$TEST_FILES" | wc -l | tr -d ' ')
+fi
 
 echo "Found $TOTAL test files"
 echo ""