diff --git a/scripts/check-provenance-corpus.sh b/scripts/check-provenance-corpus.sh
index 51c9c46..da17c14 100755
--- a/scripts/check-provenance-corpus.sh
+++ b/scripts/check-provenance-corpus.sh
@@ -23,10 +23,10 @@ set -euo pipefail
 #      could not be audited must not read as a skill that failed the audit.
 #
 # The skill set is discovered by glob, not hardcoded, so a new skill is covered
-# the moment it grows a references/sources.md. Run from repo root or pass
+# the moment it grows a references/sources.md. Runs from any cwd: REPO_ROOT defaults to the parent of this script's directory, or pass
 # REPO_ROOT as arg.
 
-REPO_ROOT="${1:-$(git rev-parse --show-toplevel 2>/dev/null || pwd)}"
+REPO_ROOT="${1:-$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)}"
 if [[ ! -d "$REPO_ROOT" ]]; then
   echo "Provenance corpus check failed: REPO_ROOT '$REPO_ROOT' is not a directory." >&2
   exit 2
diff --git a/tests/test-check-provenance-corpus.sh b/tests/test-check-provenance-corpus.sh
index 8397b85..16b7e4e 100755
--- a/tests/test-check-provenance-corpus.sh
+++ b/tests/test-check-provenance-corpus.sh
@@ -175,10 +175,85 @@ set +e
 bash "$SCRIPT" "$REPO_ROOT" > "$RUN_TMP/real.out" 2>&1
 rc=$?
 set -e
-if [[ $rc -eq 0 || $rc -eq 1 ]]; then
-  pass "gate runs to a verdict (0 or 1) against the real corpus (exit $rc)"
+if [[ $rc -eq 0 ]]; then
+  pass "real corpus is clean (exit 0)"
 else
-  fail "gate errored (exit $rc) against the real corpus: $(cat "$RUN_TMP/real.out")"
+  fail "real corpus did not validate clean (exit $rc): $(cat "$RUN_TMP/real.out")"
+fi
+
+# --- 8. Runs by absolute path from another cwd, with no argument ---
+echo ""
+echo "--- other cwd, no argument ---"
+set +e
+(cd "$RUN_TMP" && bash "$SCRIPT" > "$RUN_TMP/cwd.out" 2>&1)
+rc=$?
+set -e
+if [[ $rc -eq 0 ]]; then
+  pass "derives REPO_ROOT from the script location, not the cwd"
+else
+  fail "expected exit 0 from a foreign cwd, got $rc: $(cat "$RUN_TMP/cwd.out")"
+fi
+
+# --- 9. A skill dir without references/sources.md is skipped, not an error ---
+echo ""
+echo "--- skill without sources.md ---"
+R="$(make_repo)"
+make_skill "$R" good known-slug "$REGISTRY"
+mkdir -p "$R/plugins/p/.apm/skills/nosources"
+printf -- '---\nname: nosources\ndescription: x\n---\n' > "$R/plugins/p/.apm/skills/nosources/SKILL.md"
+set +e
+bash "$SCRIPT" "$R" > "$RUN_TMP/skip.out" 2>&1
+rc=$?
+set -e
+if [[ $rc -eq 0 ]] && grep -q "1 skill(s) checked" "$RUN_TMP/skip.out" && ! grep -q "nosources" "$RUN_TMP/skip.out"; then
+  pass "skill without sources.md is skipped silently and not counted"
+else
+  fail "expected exit 0, 1 skill checked, no mention (got $rc): $(cat "$RUN_TMP/skip.out")"
+fi
+
+# --- 10. Multiple failing skills are all reported ---
+echo ""
+echo "--- multiple failing skills ---"
+R="$(make_repo)"
+make_skill "$R" good known-slug "$REGISTRY"
+make_skill "$R" bad1 missing-one "$REGISTRY"
+make_skill "$R" bad2 missing-two "$REGISTRY"
+set +e
+bash "$SCRIPT" "$R" > "$RUN_TMP/multi.out" 2>&1
+rc=$?
+set -e
+if [[ $rc -eq 1 ]] && grep -qE "Failing skills:.*bad1" "$RUN_TMP/multi.out" \
+   && grep -qE "Failing skills:.*bad2" "$RUN_TMP/multi.out" \
+   && ! grep -qE "Failing skills:.*good" "$RUN_TMP/multi.out"; then
+  pass "exits 1 and names every failing skill"
+else
+  fail "expected exit 1 naming bad1 and bad2 (got $rc): $(cat "$RUN_TMP/multi.out")"
+fi
+
+# --- 11. An errored skill alongside a failing one: exit 2 wins, both named ---
+echo ""
+echo "--- errored + failing precedence ---"
+R="$(make_repo)"
+make_skill "$R" failing known-slug "$REGISTRY"
+make_skill "$R" broken known-slug "$REGISTRY"
+# Stub validator: FAIL for 'failing', "not auditable" for 'broken'.
+cat > "$R/$VALIDATOR_DIR/validate-provenance.sh" <<'EOF'
+#!/usr/bin/env bash
+case "$1" in
+  */failing) echo "FAIL: stub"; exit 1 ;;
+  */broken) echo "stub: not auditable" >&2; exit 2 ;;
+esac
+exit 0
+EOF
+set +e
+bash "$SCRIPT" "$R" > "$RUN_TMP/prec.out" 2>&1
+rc=$?
+set -e
+if [[ $rc -eq 2 ]] && grep -q "errored (could not audit): .*broken" "$RUN_TMP/prec.out" \
+   && grep -q "Failing skills: .*failing" "$RUN_TMP/prec.out"; then
+  pass "exit 2 takes precedence over exit 1, and both are reported"
+else
+  fail "expected exit 2 naming both (got $rc): $(cat "$RUN_TMP/prec.out")"
 fi
 
 echo ""