diff --git a/tests/diag_subgraph_for_note.py b/tests/diag_subgraph_for_note.py
new file mode 100644
index 0000000..a502000
--- /dev/null
+++ b/tests/diag_subgraph_for_note.py
@@ -0,0 +1,120 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Diagnose für den Graph-Adapter (Subgraph) in mindnet.
+
+Nutzung (aus Projektwurzel):
+
+    (.venv) python tests/diag_subgraph_for_note.py \
+        --note-id 20251130-relshow-embeddings-101 \
+        --depth 1
+
+Optional:
+
+    --prefix mindnet
+    --edge-type references --edge-type related_to ...
+
+Ziel:
+    - Ruft app.core.graph_adapter.expand(...) für eine gegebene note_id auf.
+    - Gibt edge_bonus und centrality_bonus für diese note_id aus.
+    - Zeigt zusätzlich einige Nachbarn und deren Boni.
+"""
+
+from __future__ import annotations
+
+import argparse
+import os
+import sys
+from typing import List, Optional, Tuple
+
+# sys.path anpassen, damit "import app...." aus tests/ funktioniert
+THIS_DIR = os.path.dirname(os.path.abspath(__file__))
+PROJECT_ROOT = os.path.dirname(THIS_DIR)
+if PROJECT_ROOT not in sys.path:
+    sys.path.insert(0, PROJECT_ROOT)
+
+from app.core.qdrant import QdrantConfig, get_client  # type: ignore
+import app.core.graph_adapter as ga  # type: ignore
+
+
+def build_subgraph_for_note(
+    note_id: str,
+    prefix: Optional[str],
+    depth: int,
+    edge_types: Optional[List[str]] = None,
+) -> Tuple[ga.Subgraph, str]:
+    cfg = QdrantConfig.from_env()
+    if prefix:
+        cfg.prefix = prefix
+
+    client = get_client(cfg)
+    sg = ga.expand(client, cfg.prefix, [note_id], depth=depth, edge_types=edge_types)
+    return sg, cfg.prefix
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "--note-id",
+        required=True,
+        help="Note-ID, z. B. 20251130-relshow-embeddings-101",
+    )
+    parser.add_argument(
+        "--depth",
+        type=int,
+        default=1,
+        help="Expansionstiefe (Default: 1)",
+    )
+    parser.add_argument(
+        "--prefix",
+        default=None,
+        help="Qdrant-Prefix (Default: aus ENV/QdrantConfig)",
+    )
+    parser.add_argument(
+        "--edge-type",
+        action="append",
+        default=None,
+        help="Edge-Typ-Filter (kann mehrfach angegeben werden), z. B. --edge-type references",
+    )
+    args = parser.parse_args()
+
+    note_id = args.note_id
+    depth = max(0, int(args.depth))
+    prefix = args.prefix
+    edge_types = args.edge_type
+
+    sg, eff_prefix = build_subgraph_for_note(note_id, prefix, depth, edge_types=edge_types)
+
+    print(f"Prefix: {eff_prefix}")
+    print(f"Note-ID (Seed): {note_id}")
+    print(f"Depth: {depth}")
+    print(f"Edge-Types-Filter: {edge_types or '(keiner)'}")
+    print("-" * 60)
+
+    # Boni für die Seed-Note
+    eb = sg.edge_bonus(note_id)
+    cb = sg.centrality_bonus(note_id)
+    print(f"edge_bonus({note_id})       = {eb:.4f}")
+    print(f"centrality_bonus({note_id}) = {cb:.4f}")
+    print("-" * 60)
+
+    # Ein paar weitere Knoten anzeigen (falls vorhanden)
+    print("Beispiele weiterer Knoten mit Boni (max. 10):")
+    printed = 0
+    for node, edges in sg.adj.items():
+        if node == note_id:
+            continue
+        if printed >= 10:
+            break
+        eb2 = sg.edge_bonus(node)
+        cb2 = sg.centrality_bonus(node)
+        print(f"- node={node}")
+        print(f"    edge_bonus={eb2:.4f}  centrality={cb2:.4f}")
+        printed += 1
+
+    if printed == 0:
+        print("(keine weiteren Knoten im Subgraph registriert)")
+
+
+if __name__ == "__main__":
+    main()