diff --git a/STATE.md b/STATE.md
index d9654f0..9091e19 100644
--- a/STATE.md
+++ b/STATE.md
@@ -29,3 +29,4 @@
 - [2026-03-14] evolution-daemon.sh — perpetual evolution loop on DO box (#748)
 - [2026-03-14] No mainnet VWAP bootstrap runbook (#728)
 - [2026-03-14] fitness.sh individual-scoring path still silences errors (#766)
+- [2026-03-14] batch-eval.sh MANIFEST_DIR (mktemp -d) has no cleanup trap (#763)
diff --git a/tools/push3-evolution/revm-evaluator/batch-eval.sh b/tools/push3-evolution/revm-evaluator/batch-eval.sh
index e5210e9..e6c68e1 100755
--- a/tools/push3-evolution/revm-evaluator/batch-eval.sh
+++ b/tools/push3-evolution/revm-evaluator/batch-eval.sh
@@ -103,6 +103,12 @@ fi
 # =============================================================================
 
 MANIFEST_DIR="$(mktemp -d)"
+
+cleanup() {
+    [ -d "${MANIFEST_DIR:-}" ] && rm -rf "$MANIFEST_DIR"
+}
+trap cleanup EXIT
+
 IDS_FILE="$MANIFEST_DIR/ids.txt"
 BYTECODES_FILE="$MANIFEST_DIR/bytecodes.txt"