diff --git a/harness/proxy.py b/harness/proxy.py
index 786b601..d3698a2 100644
--- a/harness/proxy.py
+++ b/harness/proxy.py
@@ -43,8 +43,8 @@ def activation_messages(text, is_error=False):
         return []
     msgs = (obj.get("activation") or {}).get("messages") or obj.get("messages") or []
     out = [str(m.get("message", ""))[:300] for m in msgs if isinstance(m, dict) and m.get("severity") == "E"]
-    if not out and is_error:
-        out = [str(obj.get("message") or text)[:300]]
+    if not out and (is_error or obj.get("success") is False):
+        out = [str(obj.get("error") or obj.get("message") or text)[:300]]  # {"success":false,"error":...} of a failed write
     return out
 
 
diff --git a/harness/runner.py b/harness/runner.py
index 10fafe3..89a9d48 100644
--- a/harness/runner.py
+++ b/harness/runner.py
@@ -91,6 +91,26 @@ def trajectory_stats(path):
             "final_report": final, "agent_seconds": round((t_last or 0) - (t_first or 0), 1)}
 
 
+def repair_stats(path):
+    """Repair rate: pushes whose source changed after a failed push of the same object / pushes after a failed push."""
+    import hashlib
+    last = None  # (object, md5, failed)
+    after = changed = 0
+    for line in open(path):
+        e = json.loads(line)
+        if e.get("tool") != "sap_push_source" or (e["result"].startswith("Tool ") and e["is_error"]):
+            continue
+        args = e.get("args", {})
+        key = (str(args.get("objectName", "")).upper(), str(args.get("includeType", "")))
+        md5 = hashlib.md5(str(args.get("source", "")).encode()).hexdigest()
+        if last and last[2] and last[0] == key:
+            after += 1
+            changed += md5 != last[1]
+        last = (key, md5, e["is_error"] or '"success":false' in e["result"].replace(" ", ""))
+    return {"pushes_after_error": after, "pushes_changed_after_error": changed,
+            "repair_rate": round(changed / after, 3) if after else None}
+
+
 class Runner:
     def __init__(self, tasks_root, runs_root):
         self.tasks_root = tasks_root
diff --git a/train/baseline.py b/train/baseline.py
index b4d58fb..924cc59 100644
--- a/train/baseline.py
+++ b/train/baseline.py
@@ -13,9 +13,9 @@ ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 sys.path.insert(0, ROOT)
 from harness.adt_client import load_env  # noqa: E402
 from harness.agents import LlmAgent  # noqa: E402
-from harness.runner import Runner  # noqa: E402
+from harness.runner import Runner, repair_stats  # noqa: E402
 
-MODEL = os.path.expanduser("~/models/Qwen3.8-27B-4bit")
+MODEL = os.path.expanduser("~/models/Devstral-Small-2-24B-4bit")
 BASE_URL = "http://127.0.0.1:8080/v1"
 LOOP_GUARD = 3  # end the run after 3 identical pushes in a row (end_reason "loop"); same for after training
 MAX_TOKENS = 16384  # per turn; sent in each request (the server limit stays 32768). Same for before/after.
@@ -32,7 +32,7 @@ def main():
     out_path = os.path.join(ROOT, "runs", "stage1", f"{a.label}.json")
     os.makedirs(os.path.dirname(out_path), exist_ok=True)
     res = json.load(open(out_path)) if os.path.exists(out_path) else {"model": MODEL, "tasks": {}}
-    res["settings"] = {"max_tokens": MAX_TOKENS, "enable_thinking": False, "temperature": 0.2, "tool_call_budget": 60, "loop_guard": LOOP_GUARD,
+    res["settings"] = {"max_tokens": MAX_TOKENS, "enable_thinking": None, "temperature": 0.2, "tool_call_budget": 60, "loop_guard": LOOP_GUARD,
                        "subset": "train/subset.json", "date": "2026-10-04"}
     runs_root = os.path.join(ROOT, "runs", "stage1", a.label)
     for i, t in enumerate(subset):
@@ -40,8 +40,7 @@ def main():
         if (a.only and tid not in a.only) or tid in res["tasks"]:
             continue
         pool = os.path.join(ROOT, "tasks") if tid.startswith("T") else os.path.join(ROOT, "tasks_gen", "eval")
-        agent = LlmAgent(MODEL, BASE_URL, max_tokens=MAX_TOKENS, chat_template_kwargs={"enable_thinking": False},
-                         loop_guard=LOOP_GUARD)
+        agent = LlmAgent(MODEL, BASE_URL, max_tokens=MAX_TOKENS, loop_guard=LOOP_GUARD)
         try:
             rep, run_dir = Runner(pool, runs_root).run(tid, agent, a.run_base + i)
         except Exception as e:  # noqa: BLE001  one broken run must not stop the series
@@ -56,6 +55,7 @@ def main():
                              "tool_calls": rep.get("tool_calls"), "seconds": rep.get("seconds"),
                              "end_reason": rep.get("end_reason"), "activation_failures": rep.get("activation_failures"),
                              "activation_error_messages": rep.get("activation_error_messages"),
+                             **repair_stats(os.path.join(run_dir, "trajectory.jsonl")),
                              "agent_seconds": rep.get("agent_seconds"), "final": (rep.get("final_report") or "")[:300],
                              "run_dir": os.path.relpath(run_dir, ROOT)}
         json.dump(res, open(out_path, "w"), indent=1)
diff --git a/train/baseline_chain.sh b/train/baseline_chain.sh
index f8b8484..4fcdff1 100755
--- a/train/baseline_chain.sh
+++ b/train/baseline_chain.sh
@@ -1,20 +1,36 @@
 #!/bin/sh
-# Baseline on the 11-task subset (Kral decision 2026-10-03), detached. Replaces night_chain.sh.
-# macOS notification after 2 tasks (time estimate) and at the end. Log: runs/stage1/baseline.log, chain log below.
+# Baseline on the 11-task subset, Devstral Small 2 (2026-10-04), detached.
+# Stop rule: after the first 4 tasks, if all 4 ended with "loop" and the repair rate is below 20 %, stop the run.
+# Log: runs/stage1/baseline.log, chain log runs/stage1/baseline_chain.log
 cd "$(dirname "$0")/.."
 log() { echo "$(date '+%F %T') $*"; }
-log "start baseline, 11 tasks, thinking off, max_tokens 16384, loop guard 3"
-python3 train/baseline.py --label baseline --run-base 20500 > runs/stage1/baseline.log 2>&1 &
+log "start baseline, 11 tasks, no thinking mode (Devstral), max_tokens 16384, loop guard 3"
+python3 train/baseline.py --label baseline_devstral --run-base 21000 > runs/stage1/baseline.log 2>&1 &
 BP=$!
 log "baseline PID $BP"
-NOTE=0
+CHECKED=0
 while kill -0 $BP 2>/dev/null; do
-  N=$(python3 -c "import json;print(len(json.load(open('runs/stage1/baseline.json'))['tasks']))" 2>/dev/null || echo 0)
-  if [ "$NOTE" = 0 ] && [ "$N" -ge 2 ]; then
-    osascript -e 'display notification "Baseline: first 2 tasks done, ask for the time estimate" with title "stage1"'
-    log "2 tasks done"; NOTE=1
+  if [ "$CHECKED" = 0 ]; then
+    R=$(python3 - <<'PY' 2>/dev/null
+import json
+t = json.load(open("runs/stage1/baseline_devstral.json"))["tasks"]
+if len(t) < 4:
+    print("wait")
+else:
+    f = list(t.values())[:4]
+    after = sum(x.get("pushes_after_error") or 0 for x in f)
+    ch = sum(x.get("pushes_changed_after_error") or 0 for x in f)
+    rate = ch / after if after else 0
+    loops = sum(x.get("end_reason") == "loop" for x in f)
+    print("stop" if loops == 4 and rate < 0.2 else "go", loops, round(rate, 3))
+PY
+)
+    case "$R" in
+      stop*) log "STOP RULE: $R"; kill $BP; osascript -e 'display notification "Stop rule: 4 loops, repair rate below 20 %" with title "stage1"'; exit 0 ;;
+      go*) log "first 4 tasks checked: $R"; CHECKED=1 ;;
+    esac
   fi
   sleep 60
 done
-log "baseline ended: $(python3 -c "import json;print(len(json.load(open('runs/stage1/baseline.json'))['tasks']))") tasks"
-osascript -e 'display notification "Baseline (11 tasks) ended" with title "stage1"'
+log "baseline ended: $(python3 -c "import json;print(len(json.load(open('runs/stage1/baseline_devstral.json'))['tasks']))") tasks"
+osascript -e 'display notification "Baseline Devstral (11 tasks) ended" with title "stage1"'
diff --git a/train/serve.sh b/train/serve.sh
index 148d701..68db2b2 100755
--- a/train/serve.sh
+++ b/train/serve.sh
@@ -1,13 +1,12 @@
 #!/bin/sh
-# Serve the base model (no adapter) with mlx_lm.server. Settings: train/README.md.
+# Base model: Devstral Small 2 (no thinking mode, no chat-template args). Serve the base model (no adapter) with mlx_lm.server. Settings: train/README.md.
 # Usage: train/serve.sh [--adapter-path PATH]
 # Prompt cache limit: without it the cache grew to 7.9 GB in 15 min (2026-10-03); A4H needs 22 GB.
 cd "$(dirname "$0")/.."
 exec train/.venv/bin/mlx_lm.server \
-  --model "$HOME/models/Qwen3.8-27B-4bit" \
+  --model "$HOME/models/Devstral-Small-2-24B-4bit" \
   --host 127.0.0.1 --port 8080 \
   --temp 0.2 --top-p 0.95 --top-k 20 --min-p 0 \
   --max-tokens 32768 \
   --prompt-cache-size 4 --prompt-cache-bytes 6000000000 \
-  --chat-template-args '{"enable_thinking": true, "reasoning_effort": "medium"}' \
   "$@"