diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8df97f37..62d0241d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,14 @@
 
 # Changelog
 
+## Sprint 150 YOLO label visible-ratio gate (2026-07-09)
+
+- Added `--min-label-visible-ratio` / `OPERATOR_YOLO_MIN_LABEL_VISIBLE_RATIO` to the operator YOLO tile dataset exporter.
+- The exporter can now drop clipped building labels where only a small share of the original object bbox is visible in an overlapping tile.
+- Tile dataset summaries and audit reports now retain/report `min_label_visible_ratio`.
+- Updated operator documentation for the recommended next dataset pass.
+- No model was activated, no detections were faked, no provider fetching was introduced and no migration changed.
+
 ## Sprint 149 YOLO duplicate suppression evidence (2026-07-09)
 
 - Added configured-YOLO cross-tile duplicate suppression before `Detection` rows are persisted.
diff --git a/backend/tests/test_sprint130_operator_yolo_tile_dataset.py b/backend/tests/test_sprint130_operator_yolo_tile_dataset.py
index 9677b35c..d94edcd9 100644
--- a/backend/tests/test_sprint130_operator_yolo_tile_dataset.py
+++ b/backend/tests/test_sprint130_operator_yolo_tile_dataset.py
@@ -38,6 +38,7 @@ def test_operator_yolo_tile_dataset_export_script_contract() -> None:
     assert "tile_size" in script
     assert "stride" in script
     assert "negative_keep_ratio" in script
+    assert "min_label_visible_ratio" in script
     assert "positive_tile_count" in script
     assert "negative_tile_count" in script
     assert "skipped_negative_tile_count" in script
@@ -64,6 +65,7 @@ def test_operator_yolo_tile_dataset_export_help_does_not_require_gis_dependencie
     assert "--tile-size" in result.stdout
     assert "--stride" in result.stdout
     assert "--negative-keep-ratio" in result.stdout
+    assert "--min-label-visible-ratio" in result.stdout
     assert "--background-negative-repeat" in result.stdout
 
 
@@ -96,6 +98,28 @@ def test_negative_tile_keep_is_deterministic_and_ratio_bound() -> None:
     assert not any(none_kept)
 
 
+def test_labels_for_tile_can_drop_tiny_visible_box_fragments() -> None:
+    module = load_tile_exporter()
+    tile = module.TileWindow(row_off=0, col_off=0, height=100, width=100)
+    mostly_outside_box = module.PixelBox(min_col=90, min_row=10, max_col=190, max_row=90)
+
+    labels_without_gate = module.labels_for_tile(
+        tile,
+        [mostly_outside_box],
+        min_label_px=4,
+        min_visible_ratio=0.0,
+    )
+    labels_with_gate = module.labels_for_tile(
+        tile,
+        [mostly_outside_box],
+        min_label_px=4,
+        min_visible_ratio=0.25,
+    )
+
+    assert labels_without_gate == ["0 0.95000000 0.50000000 0.10000000 0.80000000"]
+    assert labels_with_gate == []
+
+
 def test_background_negative_repeat_only_applies_to_training_background_tiles() -> None:
     module = load_tile_exporter()
 
diff --git a/backend/tests/test_sprint146_operator_yolo_dataset_quality_audit.py b/backend/tests/test_sprint146_operator_yolo_dataset_quality_audit.py
index b86cf5de..568253f7 100644
--- a/backend/tests/test_sprint146_operator_yolo_dataset_quality_audit.py
+++ b/backend/tests/test_sprint146_operator_yolo_dataset_quality_audit.py
@@ -44,6 +44,7 @@ def test_operator_yolo_dataset_quality_audit_reports_dataset_risks(tmp_path: Pat
                 "negative_keep_ratio": 1.0,
                 "background_negative_repeat": 2,
                 "min_label_px": 2,
+                "min_label_visible_ratio": 0.25,
                 "source_sample_count": 3,
                 "tile_count": 4,
                 "positive_tile_count": 2,
@@ -146,6 +147,7 @@ def test_operator_yolo_dataset_quality_audit_reports_dataset_risks(tmp_path: Pat
     assert report["repeated_background_negative_tile_count"] == 1
     assert report["label_stats"]["parsed_label_count"] == 3
     assert report["label_stats"]["invalid_label_count"] == 0
+    assert report["min_label_visible_ratio"] == 0.25
 
     warning_codes = {warning["code"] for warning in report["warnings"]}
     assert "positive_sample_count_below_gate" in warning_codes
@@ -157,4 +159,5 @@ def test_operator_yolo_dataset_quality_audit_reports_dataset_risks(tmp_path: Pat
     markdown = (output_dir / "operator_yolo_dataset_quality_audit.md").read_text(encoding="utf-8")
     assert "Operator YOLO Dataset Quality Audit" in markdown
     assert "Label Quality" in markdown
+    assert "Minimum visible label ratio" in markdown
     assert "positive_sample_count_below_gate" in markdown
diff --git a/docs/CODEX_EXECUTION_LOG.md b/docs/CODEX_EXECUTION_LOG.md
index 242c4d48..51ffe56d 100644
--- a/docs/CODEX_EXECUTION_LOG.md
+++ b/docs/CODEX_EXECUTION_LOG.md
@@ -1,3 +1,27 @@
+## Sprint 150 YOLO label visible-ratio gate (2026-07-09)
+
+Changed:
+- Added `--min-label-visible-ratio` / `OPERATOR_YOLO_MIN_LABEL_VISIBLE_RATIO` to `scripts/export_operator_yolo_tile_dataset.py`.
+- The tile exporter now computes the visible share of each original building bbox inside a tile and can drop labels below the configured ratio.
+- Default remains `0` for legacy behavior; use `0.25` for the next overlap-heavy operator dataset experiment.
+- Tile dataset summaries include `min_label_visible_ratio`.
+- `scripts/audit_operator_yolo_dataset_quality.py` now reports `min_label_visible_ratio` in JSON and Markdown.
+- Updated operator script documentation.
+
+Why:
+- The current rejected AOI512 candidate still shows low precision/recall after max-det and duplicate suppression hardening.
+- A likely label-quality issue is that overlapping tile export can create many small clipped edge labels for buildings mostly outside a tile.
+- This pass improves the next training dataset gate without activating a model, faking detections, fetching providers or changing persistence.
+
+Tested:
+- Red step: `python -m pytest backend\tests\test_sprint130_operator_yolo_tile_dataset.py -q` failed because the exporter lacked `min_label_visible_ratio`, CLI help and visible-fragment filtering.
+- `python -m pytest backend\tests\test_sprint130_operator_yolo_tile_dataset.py -q` (`6 passed`)
+- Red step: `python -m pytest backend\tests\test_sprint146_operator_yolo_dataset_quality_audit.py -q` failed because the audit report did not expose `min_label_visible_ratio`.
+- `python -m pytest backend\tests\test_sprint130_operator_yolo_tile_dataset.py backend\tests\test_sprint146_operator_yolo_dataset_quality_audit.py -q` (`7 passed`)
+
+Next:
+- Run full readiness, deploy Tower, export a new visible-ratio-gated operator tile dataset, audit it, then decide whether it is good enough for another CPU training candidate.
+
 ## Sprint 149 YOLO duplicate suppression evidence (2026-07-09)
 
 Changed:
diff --git a/docs/TODO.md b/docs/TODO.md
index c04c6a6f..c214da08 100644
--- a/docs/TODO.md
+++ b/docs/TODO.md
@@ -114,9 +114,10 @@ This file now starts with the current implementation status. Older preparation/b
 - [x] Rerun live dense-AOI calibration after redeploy with `YOLO_MAX_DETECTIONS=1000`; Westerlo reached 523/1000 detections at lower thresholds and Turnhout reached 822/1000, confirming the old 300 cap is removed.
 - [x] Add configured-YOLO cross-tile duplicate suppression and raw/suppressed calibration evidence fields.
 - [x] Rerun live dense-AOI calibration after redeploy with `YOLO_DUPLICATE_IOU_THRESHOLD=0.5`; Westerlo 0.25 improved to F1 `0.2537313432835821` and Turnhout 0.25 improved to F1 `0.14114114114114112`, but the candidate remains rejected.
+- [x] Add `OPERATOR_YOLO_MIN_LABEL_VISIBLE_RATIO` so the next overlapping-tile dataset can drop tiny clipped edge-fragment labels.
 - [ ] Find or train a materially stronger aerial/Kempen building model candidate; `geointel-building-yolov8n-expanded160e50-pt` is the best current dense-AOI candidate but still too weak and too noisy for a V1 default.
 - [ ] Train a higher-capacity local aerial-building detector with stronger positive recall while preserving the hard-negative false-positive gate.
-- [ ] Add more diverse positive AOIs and revisit geometry-to-box label strategy before the next default-model training attempt.
+- [ ] Export and audit a visible-ratio-gated tile dataset on Tower before the next default-model training attempt.
 - [ ] Build the next candidate gate around better positive AOI coverage, label strategy and hard-negative retention.
 
 ## Sprint 8 status
diff --git a/scripts/README.md b/scripts/README.md
index 30f4b979..b145504a 100644
--- a/scripts/README.md
+++ b/scripts/README.md
@@ -321,6 +321,7 @@ docker exec -it geointel python3 /app/scripts/export_operator_yolo_tile_dataset.
   --tile-size 160 \
   --stride 80 \
   --negative-keep-ratio 1.0 \
+  --min-label-visible-ratio 0.25 \
   --val-samples turnhout,retie,kasterlee_bos \
   --force
 ```
@@ -329,6 +330,9 @@ The tile exporter clips GRB building bounding boxes into each tile, writes
 YOLO labels beside each tile image, keeps a deterministic ratio of empty
 negative tiles, and records `yolo_tile_dataset_summary.json` with
 `positive_tile_count`, `negative_tile_count` and skipped negative tile counts.
+`--min-label-visible-ratio` drops labels where only a small clipped fragment of
+the original building bbox is visible inside the tile; this reduces noisy
+tile-edge labels in overlapping-tile datasets. Use `0` for legacy behavior.
 It remains operator tooling only: no provider fetch, no API mutation and no
 automatic model training.
 
@@ -344,7 +348,8 @@ The audit reads the tile summary and YOLO label files, then writes
 `operator_yolo_dataset_quality_audit.json` and
 `operator_yolo_dataset_quality_audit.md`. It reports positive/background sample
 coverage, train/validation split coverage, repeated hard-negative pressure,
-missing or invalid label rows and normalized box-area signals. Treat
+minimum visible label ratio, missing or invalid label rows and normalized
+box-area signals. Treat
 `needs_attention` as a dataset-design warning, not as a runtime failure: the
 next action is usually more positive AOIs, better validation coverage or more
 unique hard negatives rather than simply extending epochs.
diff --git a/scripts/audit_operator_yolo_dataset_quality.py b/scripts/audit_operator_yolo_dataset_quality.py
index 079f3d90..7433ec53 100644
--- a/scripts/audit_operator_yolo_dataset_quality.py
+++ b/scripts/audit_operator_yolo_dataset_quality.py
@@ -291,6 +291,7 @@ def build_audit(summary: dict[str, Any], summary_path: Path, args: argparse.Name
         "negative_keep_ratio": summary.get("negative_keep_ratio"),
         "background_negative_repeat": summary.get("background_negative_repeat"),
         "min_label_px": summary.get("min_label_px"),
+        "min_label_visible_ratio": summary.get("min_label_visible_ratio"),
         "tile_count": len(tiles),
         "positive_tile_count": len(positive_tiles),
         "negative_tile_count": len(negative_tiles),
@@ -348,6 +349,7 @@ def write_markdown(report: dict[str, Any], path: Path) -> None:
         f"- Tiles: {report['tile_count']} ({report['positive_tile_count']} positive, {report['negative_tile_count']} negative)",
         f"- Samples: {report['sample_count']} ({report['positive_sample_count']} positive, {report['background_sample_count']} background)",
         f"- Repeated background negative share: {report['repeated_background_negative_share_of_negatives']:.3f}",
+        f"- Minimum visible label ratio: {format_optional_float(report.get('min_label_visible_ratio'))}",
         "",
         "## Label Quality",
         "",
diff --git a/scripts/export_operator_yolo_tile_dataset.py b/scripts/export_operator_yolo_tile_dataset.py
index 5157bc44..fa93fd53 100644
--- a/scripts/export_operator_yolo_tile_dataset.py
+++ b/scripts/export_operator_yolo_tile_dataset.py
@@ -78,6 +78,15 @@ def parse_args() -> argparse.Namespace:
         default=float(os.environ.get("OPERATOR_YOLO_MIN_LABEL_PX", "4")),
         help="Minimum clipped box width/height in pixels before a tile label is kept.",
     )
+    parser.add_argument(
+        "--min-label-visible-ratio",
+        type=float,
+        default=float(os.environ.get("OPERATOR_YOLO_MIN_LABEL_VISIBLE_RATIO", "0")),
+        help=(
+            "Minimum visible share of the original object bbox required before a clipped tile label is kept. "
+            "Use 0 to keep legacy edge-fragment labels."
+        ),
+    )
     parser.add_argument(
         "--background-negative-repeat",
         type=int,
@@ -217,7 +226,7 @@ def load_reference_pixel_boxes(reference_path: Path, dataset: Any, min_label_px:
     return boxes
 
 
-def labels_for_tile(tile_window: TileWindow, boxes: list[PixelBox], min_label_px: float) -> list[str]:
+def labels_for_tile(tile_window: TileWindow, boxes: list[PixelBox], min_label_px: float, min_visible_ratio: float = 0.0) -> list[str]:
     labels: list[str] = []
     tile_min_col = tile_window.col_off
     tile_min_row = tile_window.row_off
@@ -233,6 +242,11 @@ def labels_for_tile(tile_window: TileWindow, boxes: list[PixelBox], min_label_px
         box_height = max_row - min_row
         if box_width < min_label_px or box_height < min_label_px:
             continue
+        original_area = max((box.max_col - box.min_col) * (box.max_row - box.min_row), 0.0)
+        visible_area = box_width * box_height
+        visible_ratio = visible_area / original_area if original_area > 0 else 0.0
+        if min_visible_ratio > 0 and visible_ratio < min_visible_ratio:
+            continue
         local_min_col = min_col - tile_min_col
         local_max_col = max_col - tile_min_col
         local_min_row = min_row - tile_min_row
@@ -296,6 +310,7 @@ def export_sample_tiles(
     stride: int,
     negative_keep_ratio: float,
     min_label_px: float,
+    min_label_visible_ratio: float,
     background_negative_repeat: int,
 ) -> list[dict[str, Any]]:
     sample_slug = str(sample["sample_slug"])
@@ -312,7 +327,12 @@ def export_sample_tiles(
     with rasterio.open(raster_path) as dataset:
         boxes = load_reference_pixel_boxes(reference_path, dataset, min_label_px=min_label_px)
         for tile_index, tile_window in enumerate(iter_tile_windows(dataset.width, dataset.height, tile_size, stride)):
-            labels = labels_for_tile(tile_window, boxes, min_label_px=min_label_px)
+            labels = labels_for_tile(
+                tile_window,
+                boxes,
+                min_label_px=min_label_px,
+                min_visible_ratio=min_label_visible_ratio,
+            )
             is_negative = not labels
             if is_negative and not keep_negative_tile(sample_slug, tile_index, negative_keep_ratio):
                 exported.append(
@@ -391,6 +411,7 @@ def main() -> int:
                 stride=args.stride,
                 negative_keep_ratio=args.negative_keep_ratio,
                 min_label_px=args.min_label_px,
+                min_label_visible_ratio=args.min_label_visible_ratio,
                 background_negative_repeat=args.background_negative_repeat,
             )
         )
@@ -414,6 +435,7 @@ def main() -> int:
         "negative_keep_ratio": args.negative_keep_ratio,
         "background_negative_repeat": args.background_negative_repeat,
         "min_label_px": args.min_label_px,
+        "min_label_visible_ratio": args.min_label_visible_ratio,
         "source_sample_count": len(samples),
         "tile_count": len(kept_tiles),
         "positive_tile_count": len(positive_tiles),