diff --git a/docs/opprof/oracle-gap-protocol.md b/docs/opprof/oracle-gap-protocol.md
index a929088..ac37f0e 100644
--- a/docs/opprof/oracle-gap-protocol.md
+++ b/docs/opprof/oracle-gap-protocol.md
@@ -1,11 +1,35 @@
 # Static-policy oracle-gap protocol
 
-Status: **FROZEN WITH A-OG-1 AND A-OG-2 AMENDMENTS**.
+Status: **FROZEN WITH A-OG-1, A-OG-2, AND A-OG-3 AMENDMENTS**.
 
 Date frozen: 2026-07-13 (Asia/Singapore). Existing Phase-3 measurements were
 inspected only to choose the workload pair and rate brackets. They are
 exploratory calibration data, not primary observations in this protocol.
 
+### A-OG-3 — freeze a per-logical-trial transport retry rule (after 62 scores)
+
+The first attempt at `P06-C10-r1.9-rep0` reproduced the same isolated local
+transport signature seen in A-OG-2: one clean request raised
+`ClientOSError` 3.56 ms after admission, with HTTP status 0, no first token,
+and no output. The other 343 requests produced exactly 512 tokens, the server
+stayed healthy, drain took 4.00 s, and every other client invariant passed.
+The controller again rejected the attempt before creating a `score.json`.
+
+For the remainder of this experiment, an attempt may be quarantined and the
+identical logical trial retried once on a fresh server only if all of the
+following hold: the sole failed client invariant is `clean_failures_zero`;
+exactly one clean request failed; its error is `ClientOSError`, HTTP status is
+0, it produced neither a first token nor output, and it completed within 10
+ms of admission; every successful request has exact output; and the server
+has no crash or error. The attempt is never scored. A second invalid attempt
+for the same logical key, more than one failed request, or any other error
+signature is a stop condition and makes the experiment inconclusive.
+
+This rule is independent of config, rate, and observed performance, and
+supersedes the one-key wording in A-OG-2 without changing how that retry was
+executed. Existing scores remain immutable. No client, grid, policy,
+threshold, order, SLO, or oracle calculation changes.
+
 ### A-OG-2 — retry one transport-invalid attempt (after 49 scored trials)
 
 The first attempt at `P06-C01-r2.2-rep0` produced one local
diff --git a/scripts/oracle_gap/run_frontier.py b/scripts/oracle_gap/run_frontier.py
index 92952c9..05ea898 100644
--- a/scripts/oracle_gap/run_frontier.py
+++ b/scripts/oracle_gap/run_frontier.py
@@ -20,10 +20,10 @@ from analyze import CONFIGS, PHASES, atomic_json, score_trial, summarize_trials
 
 
 SCHEMA = 1
-AMENDMENT = "A-OG-2"
+AMENDMENT = "A-OG-3"
 AMENDMENT_REASON = (
-    "retry one quarantined P06-C01-r2.2-rep0 transport-invalid attempt "
-    "without changing its logical trial"
+    "apply the frozen per-logical-trial quarantine rule to an isolated "
+    "local transport-invalid attempt"
 )
 REMOTE_ROOT = Path("/home/admin/cpfs/wjh/oracle-gap-20260713")
 RUN_ROOT = REMOTE_ROOT / "runs"
diff --git a/tests/test_oracle_gap.py b/tests/test_oracle_gap.py
index d661c7a..177310a 100644
--- a/tests/test_oracle_gap.py
+++ b/tests/test_oracle_gap.py
@@ -175,7 +175,7 @@ def test_a_og_1_extends_only_mutable_resume_fields() -> None:
     )
 
 
-def test_a_og_2_requires_the_amended_grid_to_stay_fixed() -> None:
+def test_a_og_3_requires_the_amended_grid_to_stay_fixed() -> None:
     old = {
         "analyzer_sha256": "analyzer",
         "p5_client_sha256": "p5",
@@ -190,7 +190,7 @@ def test_a_og_2_requires_the_amended_grid_to_stay_fixed() -> None:
         "up_extensions": {"P01": [38.0], "P06": [2.1, 2.2, 2.3, 2.4]},
     }
 
-    assert AMENDMENT == "A-OG-2"
+    assert AMENDMENT == "A-OG-3"
     assert resume_compatible(old, {**old, "controller_sha256": "new"})
     assert not resume_compatible(
         old,