diff --git a/validate/lint.sh b/validate/lint.sh
index 7a0550f..1b47f67 100755
--- a/validate/lint.sh
+++ b/validate/lint.sh
@@ -11,8 +11,17 @@ errors=0
 
 echo "=== Lint Scan ==="
 
-has_python=$(find "$TARGET" -name "*.py" -not -path "*/.*" | head -1)
-has_go=$(find "$TARGET" -name "*.go" -not -path "*/.*" | head -1)
+# Probe for source files. Explicit prunes (rather than -not -path "*/.*")
+# so that target paths under hidden ancestor dirs (e.g. a Claude Code
+# worktree at .../.claude/worktrees/<name>/) still match real source.
+# -print -quit instead of `| head -1` avoids SIGPIPE under `set -o pipefail`.
+has_python=$(find "$TARGET" \
+    \( -path '*/__pycache__' -o -path '*/.venv' -o -path '*/venv' \
+       -o -path '*/.git' -o -path '*/node_modules' \) -prune \
+    -o -name '*.py' -print -quit)
+has_go=$(find "$TARGET" \
+    \( -path '*/.git' -o -path '*/vendor' -o -path '*/node_modules' \) -prune \
+    -o -name '*.go' -print -quit)
 
 if [ -z "$has_python" ] && [ -z "$has_go" ]; then
   printf "${YELLOW}!${NC} No Python or Go files found — skipping\n"
diff --git a/validate/sast.sh b/validate/sast.sh
index 8b3ce66..77758f5 100755
--- a/validate/sast.sh
+++ b/validate/sast.sh
@@ -16,8 +16,17 @@ if ! command -v semgrep &>/dev/null; then
   exit 2
 fi
 
-has_python=$(find "$TARGET" -name "*.py" -not -path "*/.*" | head -1)
-has_go=$(find "$TARGET" -name "*.go" -not -path "*/.*" | head -1)
+# Probe for source files. Explicit prunes (rather than -not -path "*/.*")
+# so that target paths under hidden ancestor dirs (e.g. a Claude Code
+# worktree at .../.claude/worktrees/<name>/) still match real source.
+# -print -quit instead of `| head -1` avoids SIGPIPE under `set -o pipefail`.
+has_python=$(find "$TARGET" \
+    \( -path '*/__pycache__' -o -path '*/.venv' -o -path '*/venv' \
+       -o -path '*/.git' -o -path '*/node_modules' \) -prune \
+    -o -name '*.py' -print -quit)
+has_go=$(find "$TARGET" \
+    \( -path '*/.git' -o -path '*/vendor' -o -path '*/node_modules' \) -prune \
+    -o -name '*.go' -print -quit)
 
 if [ -z "$has_python" ] && [ -z "$has_go" ]; then
   printf "${YELLOW}!${NC} No Python or Go files found — skipping\n"