diff --git a/eval/harbor/run_tb21_nano_max.sh b/eval/harbor/run_tb21_nano_max.sh
new file mode 100755
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+++ b/eval/harbor/run_tb21_nano_max.sh
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+#!/usr/bin/env bash
+# Run the clawcodex --nano arm of the TB 2.1 comparison, matched to the
+# existing pi run at eval/harbor/jobs/tb21-pi-flash-max-2:
+#   same model (deepseek/deepseek-v4-flash), same reasoning level
+#   (effort=max == pi thinking=max on DeepSeek's low|high|max vocabulary),
+#   same retry policy (2x on ApiRateLimitError). Advisor is structurally
+#   off under nano. See RUN_NANO_TB21.md "Fair nano-vs-pi setup".
+#
+# Usage, from the repo root:
+#   bash eval/harbor/run_tb21_nano_max.sh [job-name]
+# Default job name: tb21-nano-flash-max-1
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+cd "$ROOT"
+JOB_NAME="${1:-tb21-nano-flash-max-1}"
+
+# Both harnesses at explicit levels; stray env fallbacks must not leak in.
+unset CLAWCODEX_EFFORT PI_THINKING 2>/dev/null || true
+
+if [ -z "${DEEPSEEK_API_KEY:-}" ]; then
+  DEEPSEEK_API_KEY="$(python3 -c "import json,pathlib;print(json.loads((pathlib.Path.home()/'.clawcodex'/'config.json').read_text())['providers']['deepseek']['api_key'])")"
+  export DEEPSEEK_API_KEY
+fi
+if [ -z "${DEEPSEEK_API_KEY}" ]; then
+  echo "error: no DeepSeek API key (env or ~/.clawcodex/config.json)" >&2
+  exit 2
+fi
+
+WHEEL="$(ls "$ROOT"/dist/clawcodex_cli-*.whl 2>/dev/null | head -1 || true)"
+if [ -z "$WHEEL" ]; then
+  echo "building wheel from the current checkout..."
+  uv build --wheel
+  WHEEL="$(ls "$ROOT"/dist/clawcodex_cli-*.whl | head -1)"
+fi
+echo "wheel: $WHEEL"
+echo "job:   eval/harbor/jobs/$JOB_NAME"
+
+PYTHONPATH="$ROOT/eval/harbor" harbor run \
+  --dataset terminal-bench/terminal-bench-2-1 \
+  --agent clawcodex_agent:Clawcodex \
+  --model deepseek/deepseek-v4-flash \
+  --jobs-dir eval/harbor/jobs \
+  --job-name "$JOB_NAME" \
+  --n-concurrent 4 \
+  --max-retries 2 \
+  --retry-include ApiRateLimitError \
+  --ak "source=$WHEEL" \
+  --ak nano=1 \
+  --ak effort=max
+
+echo
+echo "Compare against the pi run with:"
+echo "  python3 eval/harbor/compare_trajectories.py eval/harbor/jobs/tb21-pi-flash-max-2 eval/harbor/jobs/$JOB_NAME"