diff --git a/examples/folio/gates-testdata/g2-benign-only/output.log b/examples/folio/gates-testdata/g2-benign-only/output.log
index e628145..9403538 100644
--- a/examples/folio/gates-testdata/g2-benign-only/output.log
+++ b/examples/folio/gates-testdata/g2-benign-only/output.log
@@ -1,4 +1,5 @@
 companion pid=4242 listening on 127.0.0.1:51000
 objc[4242]: Class FBSDKError is implemented in both /a (0x1) and /b (0x2). One of the two will be used. Which one is undefined.
 WARNING: All log messages before absl::InitializeLog() is called are written to STDERR
+archived previous runs under runs/ERRORS_archive
 run complete
diff --git a/examples/folio/gates-testdata/g2-real-error/output.log b/examples/folio/gates-testdata/g2-real-error/output.log
index b8c34fa..6fb91f1 100644
--- a/examples/folio/gates-testdata/g2-real-error/output.log
+++ b/examples/folio/gates-testdata/g2-real-error/output.log
@@ -1,4 +1,5 @@
 companion pid=4242 listening on 127.0.0.1:51000
 objc[4242]: Class FBSDKError is implemented in both /a (0x1) and /b (0x2). One of the two will be used. Which one is undefined.
 WARNING: All log messages before absl::InitializeLog() is called are written to STDERR
+archived previous runs under runs/ERRORS_archive
 error: hierarchy fetch failed: companion connection lost
diff --git a/examples/folio/gates-testdata/generate.py b/examples/folio/gates-testdata/generate.py
index 826fe01..2132ce3 100644
--- a/examples/folio/gates-testdata/generate.py
+++ b/examples/folio/gates-testdata/generate.py
@@ -77,6 +77,9 @@ BENIGN_NOISE = [
     "objc[4242]: Class FBSDKError is implemented in both /a (0x1) and /b (0x2). "
     "One of the two will be used. Which one is undefined.\n",
     "WARNING: All log messages before absl::InitializeLog() is called are written to STDERR\n",
+    # An incidental ERROR substring inside a longer word: the G2 scan is
+    # word-bounded, so this must not trip the gate.
+    "archived previous runs under runs/ERRORS_archive\n",
 ]
 
 write_run("pass", healthy_steps())
diff --git a/examples/folio/gates.sh b/examples/folio/gates.sh
index 414b300..1c1458d 100755
--- a/examples/folio/gates.sh
+++ b/examples/folio/gates.sh
@@ -47,8 +47,9 @@ companion_process_name="idb_companion"
 # only lines that are provably harmless and emitted on every healthy run.
 benign_stderr_substrings=(
   # The dynamic linker reports the same Objective-C class registered by two
-  # loaded images. The companion runs fine; this is cosmetic.
-  "objc[*]: Class"
+  # loaded images. The companion runs fine; this is cosmetic. The real line
+  # reads "objc[<pid>]: Class ...", so the fixed substring is "]: Class".
+  "]: Class"
   "is implemented in both"
   "One of the two will be used. Which one is undefined."
   # gRPC and absl emit informational banner lines on startup.
@@ -59,8 +60,9 @@ benign_stderr_substrings=(
 
 # G2 helper: strip benign companion noise, then report sanderling ERROR lines.
 # sanderling's progress logger renders error-level records as lines beginning
-# "error:" (see internal/testrun/progress.go). We also catch upper-case ERROR
-# for safety against future handlers.
+# "error:" (see internal/testrun/progress.go). We also catch the upper-case
+# ERROR token (word-bounded, so ERRORS/ERRORLESS and path fragments do not
+# trip the gate) for safety against future handlers.
 error_lines_in() {
   local output_file="$1"
   local filtered
@@ -69,7 +71,7 @@ error_lines_in() {
   for pattern in "${benign_stderr_substrings[@]}"; do
     filtered="$(printf '%s\n' "$filtered" | grep -vF "$pattern" || true)"
   done
-  printf '%s\n' "$filtered" | grep -E '(^error:|ERROR|level=ERROR)' || true
+  printf '%s\n' "$filtered" | grep -E '(^error:|\bERROR\b)' || true
 }
 
 # G1: process exit status recorded by the runner loop.