diff --git a/docs/perf-model/fpm-self-service/implementation.md b/docs/perf-model/fpm-self-service/implementation.md
index e0f7fb4ff4..a076f455d2 100644
--- a/docs/perf-model/fpm-self-service/implementation.md
+++ b/docs/perf-model/fpm-self-service/implementation.md
@@ -1249,6 +1249,8 @@ Zero-KV prefill can retain a native `real_prefix` path stamp while its formal se
 
 Dense decode can be synthetic by design only when the producer reports enabled warm-up with `warm_eligible: false` and `skip_reason: dense_model_content_insensitive`, and the pinned native evidence corroborates a dense full-attention model and its exact runtime/topology. The supported case is single-rank or attention TP with PP1, DP1, MoE TP1/EP1, and prefill and decode context parallelism both equal to 1. Initialized cache groups must be causal full attention, with no sliding window, attention chunking, convolution or recurrent state; a `FullAttentionSpec` type name alone is insufficient. Matching model and runtime identities and every expected native rank are required. Consistent qualifying points publish as `skip:dense_model_content_insensitive` under the explicit `dense_full_attention_v1` metadata policy. This retains their measured samples and raw provenance; it does not establish real KV content or serving accuracy. Other `fake_fallback` points remain ineligible for direct timing.
 
+Dynamo can report this deliberate dense skip either with the historical `kvwarm_fake_fallback` point stamp or with an explicit per-point `kv_seed_regime: skip:dense_model_content_insensitive` and no fallback stamp. Both formats require the same engine evidence above. A configuration-level skip reason alone does not qualify an unstamped point. Worker-probe sidecars are separate provenance artifacts, not rank timing results, and do not replace the required engine snapshot.
+
 Readiness counts describe the current reaggregation of verified native artifacts. They do not relabel an existing formal pair. Historical publications without the dense classification marker retain their recorded regimes during verification, finalization and validation; any revised publication needs a fresh output tree while preserving the original pair.
 
 `ready_for_full_collection` permits the next collection step only for the verified sampled scope. For imported runtime profiles, `runtime_compatibility` separately reports whether the actual collection observations preserve accepted memory; requests without those observations retain the timing-only assessment. Readiness does not establish interpolation coverage, repeatability or workload accuracy. Full execution checks matching usable smoke or formal evidence for every current cell before launching new GPU work; it does not treat a completed memory probe, process exit or existing report file as sufficient. Continue the existing collection-quality, memory-finalization, replay and matched-serving steps afterward.
diff --git a/python/aisim/collector/fpm_forward/database.py b/python/aisim/collector/fpm_forward/database.py
index 2b60a62e41..6a6fcf2173 100644
--- a/python/aisim/collector/fpm_forward/database.py
+++ b/python/aisim/collector/fpm_forward/database.py
@@ -264,9 +264,12 @@ def aggregate_cell(
         and _dense_synthetic_kv_eligible(plan, cell, cell_dir / "raw", collection)
     )
 
-    def _kv_seed_regime(point: dict[str, Any], phase: str) -> str:
+    def _kv_seed_regime(point: dict[str, Any], phase: str, native_regime: str | None) -> str:
         if phase == "prefill" and (not cell.execution_identity[0] or int(point["total_kv_read_tokens"]) == 0):
             return "n/a"
+        # New producers report deliberate skips without a fake-fallback stamp.
+        if native_regime == "skip:dense_model_content_insensitive":
+            return native_regime if dense_synthetic else "fake_fallback"
         reasons = point.get("sample_reasons") or []
         # A cached prefill states in its point stamps how the engine seeded its prefix, and the warm-up block, which
         # describes the decode protocol, cannot classify it. A prefix that real forward passes computed is real KV,
@@ -302,7 +305,7 @@ def _kv_seed_regime(point: dict[str, Any], phase: str) -> str:
         batch = int(point["batch_size"])
         total_prefill = int(point["total_prefill_tokens"])
         total_kv = int(point["total_kv_read_tokens"])
-        regime = _kv_seed_regime(point, phase)
+        regime = _kv_seed_regime(point, phase, measurement.kv_seed_regime)
         if cell.execution_identity[0] and (phase == "decode" or total_kv > 0) and regime != "real_kv":
             raise ValueError(
                 f"execution-identity cells require real KV measurements for cached prefill and decode, got {regime}"
diff --git a/python/aisim/collector/network/slurm/README.md b/python/aisim/collector/network/slurm/README.md
index 255f746622..6838cdf08e 100755
--- a/python/aisim/collector/network/slurm/README.md
+++ b/python/aisim/collector/network/slurm/README.md
@@ -3,7 +3,7 @@ SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All
 SPDX-License-Identifier: Apache-2.0
 -->
 
-# 1.nccl-test collection step by step 
+# 1.nccl-test collection step by step
 
 ## 1.1 Replace the "/path/to" in the sctipt with actual path
 
diff --git a/python/aisim/collector/sglang/README.md b/python/aisim/collector/sglang/README.md
index 2cbbc3cf68..f125314dd8 100644
--- a/python/aisim/collector/sglang/README.md
+++ b/python/aisim/collector/sglang/README.md
@@ -156,7 +156,7 @@ SGLANG_LOAD_FORMAT=dummy SGLANG_TEST_NUM_LAYERS=2 \
 ```
 
 #### Environment Variables
-- `DEEPSEEK_MODEL_PATH`: Path to DeepSeek model 
+- `DEEPSEEK_MODEL_PATH`: Path to DeepSeek model
 - `SGLANG_LOAD_FORMAT`: Load format, set to `dummy` to skip weight loading
 - `SGLANG_TEST_NUM_LAYERS`: Load only specified number of layers (with dummy mode)
 - `SGLANG_TEST_LAYER`: Layer index to test (default: 0)
diff --git a/python/aisim/tests/unit/collector/test_fpm_dense_synthetic_kv.py b/python/aisim/tests/unit/collector/test_fpm_dense_synthetic_kv.py
index ea19c69251..2132c1cb31 100644
--- a/python/aisim/tests/unit/collector/test_fpm_dense_synthetic_kv.py
+++ b/python/aisim/tests/unit/collector/test_fpm_dense_synthetic_kv.py
@@ -73,7 +73,16 @@ def _engine(plan, cell, *, version=None, groups=None):
     }
 
 
-def _dense_cell(tmp_path, *, groups=None):
+def _use_native_dense_skip(payload):
+    for row in payload["results"]:
+        row["kv_seed_regime"] = "skip:dense_model_content_insensitive"
+    for entry in (*payload["results"], *payload["iteration_groups"]):
+        entry["point"]["sample_reasons"] = [
+            reason for reason in entry["point"]["sample_reasons"] if reason != "kvwarm_fake_fallback"
+        ]
+
+
+def _dense_cell(tmp_path, *, groups=None, native_skip=False):
     plan, cell, directory = _synthetic_decode_cell(
         tmp_path,
         kvwarm=_DENSE_SKIP,
@@ -93,6 +102,8 @@ def _dense_cell(tmp_path, *, groups=None):
     payload["engine"] = _engine(plan, cell, groups=groups)
     for row in payload["results"]:
         row["kv_seed_regime"] = "fake_fallback"
+    if native_skip:
+        _use_native_dense_skip(payload)
     path.write_text(json.dumps(payload))
     return plan, cell, directory, path
 
@@ -107,15 +118,39 @@ def _regimes(case):
     [[_FULL], [_FULL, _FULL], [{"type": "UniformTypeKVCacheSpecs", "specs": [_FULL, _FULL]}]],
     ids=["full", "multiple-full", "wrapped-full"],
 )
-def test_dense_full_attention_preserves_native_samples_and_becomes_direct_eligible(tmp_path, groups):
-    case = _dense_cell(tmp_path, groups=groups)
+@pytest.mark.parametrize("native_skip", [False, True], ids=["legacy-stamp", "native-skip"])
+def test_dense_full_attention_preserves_native_samples_and_becomes_direct_eligible(tmp_path, groups, native_skip):
+    case = _dense_cell(tmp_path, groups=groups, native_skip=native_skip)
     plan, cell, directory, path = case
     before = path.read_bytes()
     rows = aggregate_cell(plan, cell, directory, expected_attempt_id="attempt")
     assert {row["kv_seed_regime"] for row in rows} == {"skip:dense_model_content_insensitive"}
     assert [row["latency_ms"] for row in rows] == [10.0, 20.0]
     assert path.read_bytes() == before
-    assert {row["kv_seed_regime"] for row in json.loads(before)["results"]} == {"fake_fallback"}
+    assert {row["kv_seed_regime"] for row in json.loads(before)["results"]} == {
+        "skip:dense_model_content_insensitive" if native_skip else "fake_fallback"
+    }
+
+
+def test_native_dense_skip_with_separate_worker_probe_uses_startup_engine_evidence(tmp_path):
+    case = _dense_cell(tmp_path, native_skip=True)
+    path = case[-1]
+    payload = json.loads(path.read_text())
+    payload["engine"].update(resolution="pending_worker_probe", resolved=None)
+    path.write_text(json.dumps(payload))
+    sidecar = path.with_name("benchmark_merged_worker_probe.json")
+    sidecar.write_text(json.dumps({"schema": "dynamo.fpm.benchmark_worker_probe", "schema_version": 1}))
+    before = path.read_bytes(), sidecar.read_bytes()
+    assert _regimes(case) == {"skip:dense_model_content_insensitive"}
+    assert (path.read_bytes(), sidecar.read_bytes()) == before
+
+
+def test_native_dense_skip_without_warmup_metadata_is_not_legacy(tmp_path):
+    case = _dense_cell(tmp_path, native_skip=True)
+    payload = json.loads(case[-1].read_text())
+    del payload["kvwarm"]
+    case[-1].write_text(json.dumps(payload))
+    assert _regimes(case) == {"fake_fallback"}
 
 
 @pytest.mark.parametrize(
@@ -141,8 +176,9 @@ def test_dense_full_attention_preserves_native_samples_and_becomes_direct_eligib
         [{**_FULL, "specs": [{"type": "ShortConvSpec"}]}],
     ],
 )
-def test_unknown_or_non_full_attention_cache_never_promotes_dense_skip(tmp_path, groups):
-    assert _regimes(_dense_cell(tmp_path, groups=groups)) == {"fake_fallback"}
+@pytest.mark.parametrize("native_skip", [False, True])
+def test_unknown_or_non_full_attention_cache_never_promotes_dense_skip(tmp_path, groups, native_skip):
+    assert _regimes(_dense_cell(tmp_path, groups=groups, native_skip=native_skip)) == {"fake_fallback"}
 
 
 @pytest.mark.parametrize(
@@ -165,8 +201,9 @@ def test_unknown_or_non_full_attention_cache_never_promotes_dense_skip(tmp_path,
         ("kv_cache", "groups", None),
     ],
 )
-def test_contradictory_or_missing_initialized_identity_stays_fake_fallback(tmp_path, section, key, value):
-    case = _dense_cell(tmp_path)
+@pytest.mark.parametrize("native_skip", [False, True])
+def test_contradictory_or_missing_initialized_identity_stays_fake_fallback(tmp_path, section, key, value, native_skip):
+    case = _dense_cell(tmp_path, native_skip=native_skip)
     payload = json.loads(case[-1].read_text())
     payload["engine"][section][key] = value
     case[-1].write_text(json.dumps(payload))
@@ -177,8 +214,9 @@ def test_contradictory_or_missing_initialized_identity_stays_fake_fallback(tmp_p
 
 
 @pytest.mark.parametrize("missing", ["engine", "model", "parallel", "versions", "kv_cache"])
-def test_historical_or_incomplete_engine_evidence_is_not_promoted(tmp_path, missing):
-    case = _dense_cell(tmp_path)
+@pytest.mark.parametrize("native_skip", [False, True])
+def test_historical_or_incomplete_engine_evidence_is_not_promoted(tmp_path, missing, native_skip):
+    case = _dense_cell(tmp_path, native_skip=native_skip)
     payload = json.loads(case[-1].read_text())
     (payload if missing == "engine" else payload["engine"]).pop(missing)
     case[-1].write_text(json.dumps(payload))
@@ -263,8 +301,9 @@ def test_historical_saved_identity_retains_dense_evidence_without_reloading_sour
         {"enabled": True, "warm_eligible": False, "skip_reason": "hybrid_state_layers_unsupported"},
     ],
 )
-def test_full_attention_does_not_convert_failed_or_disabled_warmup(tmp_path, meta):
-    case = _dense_cell(tmp_path)
+@pytest.mark.parametrize("native_skip", [False, True])
+def test_full_attention_does_not_convert_failed_or_disabled_warmup(tmp_path, meta, native_skip):
+    case = _dense_cell(tmp_path, native_skip=native_skip)
     payload = json.loads(case[-1].read_text())
     payload["kvwarm"] = meta
     case[-1].write_text(json.dumps(payload))
@@ -283,11 +322,14 @@ def test_dense_skip_with_real_kv_injection_is_rejected(tmp_path):
         _regimes(case)
 
 
-def test_unstamped_dense_point_is_not_promoted_from_skip_reason_alone(tmp_path):
+@pytest.mark.parametrize("regime", [None, "skip:dataset_unavailable", "not_applicable"])
+def test_unstamped_dense_point_is_not_promoted_from_skip_reason_alone(tmp_path, regime):
     case = _dense_cell(tmp_path)
     payload = json.loads(case[-1].read_text())
     for row, group in zip(payload["results"], payload["iteration_groups"], strict=True):
         row.pop("kv_seed_regime")
+        if regime is not None:
+            row["kv_seed_regime"] = regime
         row["point"]["sample_reasons"] = []
         group["point"]["sample_reasons"] = []
     case[-1].write_text(json.dumps(payload))
@@ -313,10 +355,11 @@ def test_existing_moe_by_construction_and_legacy_contracts_are_unchanged(tmp_pat
     }
 
 
-def test_dense_publication_keeps_legacy_classification_until_fresh_publication(tmp_path):
+@pytest.mark.parametrize("native_skip", [False, True])
+def test_dense_publication_keeps_legacy_classification_until_fresh_publication(tmp_path, native_skip):
     import pyarrow.parquet as pq
 
-    plan, cell, directory, _path = _dense_cell(tmp_path)
+    plan, cell, directory, _path = _dense_cell(tmp_path, native_skip=native_skip)
     legacy_rows = aggregate_cell(plan, cell, directory, expected_attempt_id="attempt", dense_synthetic_kv=False)
     old_table, old_meta, _ = write_formal_database(plan, legacy_rows, systems_root=tmp_path / "old")
     old_bytes = old_table.read_bytes(), old_meta.read_bytes()
@@ -403,7 +446,8 @@ def test_merged_database_does_not_upgrade_old_dense_cells(tmp_path):
 
 
 @pytest.mark.parametrize("observed", ["full", "convolution", "unreported"])
-def test_public_readiness_uses_corroborated_dense_regime(quality_case, observed):  # noqa: F811
+@pytest.mark.parametrize("native_skip", [False, True])
+def test_public_readiness_uses_corroborated_dense_regime(quality_case, observed, native_skip):  # noqa: F811
     case = quality_case
     _change_decode(case, fake="all", kvwarm=_DENSE_SKIP)
     for cell in case["plan"].cells:
@@ -411,6 +455,8 @@ def test_public_readiness_uses_corroborated_dense_regime(quality_case, observed)
             continue
         for path in (case["campaign"] / "cells" / cell.cell_id / "raw").rglob("benchmark-dp*.json"):
             payload = json.loads(path.read_text())
+            if native_skip:
+                _use_native_dense_skip(payload)
             if observed != "unreported":
                 groups = [_FULL] if observed == "full" else [_FULL, {"type": "ShortConvSpec"}]
                 payload["engine"] = _engine(case["plan"], cell, groups=groups)
@@ -420,7 +466,9 @@ def test_public_readiness_uses_corroborated_dense_regime(quality_case, observed)
     report = assess_readiness(case["request"], case["root"], case["checkpoint"].parent)
     decode = next(row for row in report["selected_cells"] if row["cell"]["workload_kind"] == "decode")
     assert decode["formal_regime_counts"], decode["blockers"]
-    assert decode["native_regime_counts"] == {"fake_fallback": 12}
+    assert decode["native_regime_counts"] == {
+        "skip:dense_model_content_insensitive" if native_skip else "fake_fallback": 12
+    }
     assert decode["direct_eligible_points"] == (12 if observed == "full" else 0)
     assert decode["status"] == ("ready" if observed == "full" else "blocked")
     assert decode["formal_regime_counts"] == {