Fix: set cosine distance metadata on all collection creation sites

ChromaDB defaults HNSW index to L2 (Euclidean) distance, but
MemPalace scoring uses 1-distance which requires cosine (range 0-2).
Add metadata={"hnsw:space": "cosine"} to the 4 production and 3 test
call sites that were missing it.

Closes #218

mempalace/backends/chroma.py

@@ -35,8 +35,13 @@ def _fix_blob_seq_ids(palace_path: str):
                     continue
                 if not rows:
                     continue
-                updates = [(int.from_bytes(blob, byteorder="big"), rowid) for rowid, blob in rows]
+                updates = [
-                conn.executemany(f"UPDATE {table} SET seq_id = ? WHERE rowid = ?", updates)
+                    (int.from_bytes(blob, byteorder="big"), rowid)
+                    for rowid, blob in rows
+                ]
+                conn.executemany(
+                    f"UPDATE {table} SET seq_id = ? WHERE rowid = ?", updates
+                )
                 logger.info("Fixed %d BLOB seq_ids in %s", len(updates), table)
             conn.commit()
     except Exception:
@@ -71,7 +76,9 @@ class ChromaCollection(BaseCollection):
 class ChromaBackend:
     """Factory for MemPalace's default ChromaDB backend."""
 
-    def get_collection(self, palace_path: str, collection_name: str, create: bool = False):
+    def get_collection(
+        self, palace_path: str, collection_name: str, create: bool = False
+    ):
         if not create and not os.path.isdir(palace_path):
             raise FileNotFoundError(palace_path)
 
@@ -85,7 +92,9 @@ class ChromaBackend:
         _fix_blob_seq_ids(palace_path)
         client = chromadb.PersistentClient(path=palace_path)
         if create:
-            collection = client.get_or_create_collection(collection_name)
+            collection = client.get_or_create_collection(
+                collection_name, metadata={"hnsw:space": "cosine"}
+            )
         else:
             collection = client.get_collection(collection_name)
         return ChromaCollection(collection)

mempalace/cli.py

@@ -48,7 +48,11 @@ def cmd_init(args):
     if files:
         print(f"  Reading {len(files)} files...")
         detected = detect_entities(files)
-        total = len(detected["people"]) + len(detected["projects"]) + len(detected["uncertain"])
+        total = (
+            len(detected["people"])
+            + len(detected["projects"])
+            + len(detected["uncertain"])
+        )
         if total > 0:
             confirmed = confirm_entities(detected, yes=getattr(args, "yes", False))
             # Save confirmed entities to <project>/entities.json for the miner
@@ -66,7 +70,11 @@ def cmd_init(args):
 
 
 def cmd_mine(args):
-    palace_path = os.path.expanduser(args.palace) if args.palace else MempalaceConfig().palace_path
+    palace_path = (
+        os.path.expanduser(args.palace)
+        if args.palace
+        else MempalaceConfig().palace_path
+    )
     include_ignored = []
     for raw in args.include_ignored or []:
         include_ignored.extend(part.strip() for part in raw.split(",") if part.strip())
@@ -101,7 +109,11 @@ def cmd_mine(args):
 def cmd_search(args):
     from .searcher import search, SearchError
 
-    palace_path = os.path.expanduser(args.palace) if args.palace else MempalaceConfig().palace_path
+    palace_path = (
+        os.path.expanduser(args.palace)
+        if args.palace
+        else MempalaceConfig().palace_path
+    )
     try:
         search(
             query=args.query,
@@ -118,7 +130,11 @@ def cmd_wakeup(args):
     """Show L0 (identity) + L1 (essential story) — the wake-up context."""
     from .layers import MemoryStack
 
-    palace_path = os.path.expanduser(args.palace) if args.palace else MempalaceConfig().palace_path
+    palace_path = (
+        os.path.expanduser(args.palace)
+        if args.palace
+        else MempalaceConfig().palace_path
+    )
     stack = MemoryStack(palace_path=palace_path)
 
     text = stack.wake_up(wing=args.wing)
@@ -155,14 +171,26 @@ def cmd_migrate(args):
     """Migrate palace from a different ChromaDB version."""
     from .migrate import migrate
 
-    palace_path = os.path.expanduser(args.palace) if args.palace else MempalaceConfig().palace_path
+    palace_path = (
-    migrate(palace_path=palace_path, dry_run=args.dry_run, confirm=getattr(args, "yes", False))
+        os.path.expanduser(args.palace)
+        if args.palace
+        else MempalaceConfig().palace_path
+    )
+    migrate(
+        palace_path=palace_path,
+        dry_run=args.dry_run,
+        confirm=getattr(args, "yes", False),
+    )
 
 
 def cmd_status(args):
     from .miner import status
 
-    palace_path = os.path.expanduser(args.palace) if args.palace else MempalaceConfig().palace_path
+    palace_path = (
+        os.path.expanduser(args.palace)
+        if args.palace
+        else MempalaceConfig().palace_path
+    )
     status(palace_path=palace_path)
 
 
@@ -173,7 +201,9 @@ def cmd_repair(args):
     from .migrate import confirm_destructive_action, contains_palace_database
 
     palace_path = os.path.abspath(
-        os.path.expanduser(args.palace) if args.palace else MempalaceConfig().palace_path
+        os.path.expanduser(args.palace)
+        if args.palace
+        else MempalaceConfig().palace_path
     )
     db_path = os.path.join(palace_path, "chroma.sqlite3")
 
@@ -217,7 +247,9 @@ def cmd_repair(args):
     all_metas = []
     offset = 0
     while offset < total:
-        batch = col.get(limit=batch_size, offset=offset, include=["documents", "metadatas"])
+        batch = col.get(
+            limit=batch_size, offset=offset, include=["documents", "metadatas"]
+        )
         all_ids.extend(batch["ids"])
         all_docs.extend(batch["documents"])
         all_metas.extend(batch["metadatas"])
@@ -240,7 +272,9 @@ def cmd_repair(args):
 
     print("  Rebuilding collection...")
     client.delete_collection("mempalace_drawers")
-    new_col = client.create_collection("mempalace_drawers")
+    new_col = client.create_collection(
+        "mempalace_drawers", metadata={"hnsw:space": "cosine"}
+    )
 
     filed = 0
     for i in range(0, len(all_ids), batch_size):
@@ -287,7 +321,9 @@ def cmd_mcp(args):
 
     if not args.palace:
         print("\nOptional custom palace:")
-        print(f"  claude mcp add mempalace -- {base_server_cmd} --palace /path/to/palace")
+        print(
+            f"  claude mcp add mempalace -- {base_server_cmd} --palace /path/to/palace"
+        )
         print(f"  {base_server_cmd} --palace /path/to/palace")
 
 
@@ -296,7 +332,11 @@ def cmd_compress(args):
     import chromadb
     from .dialect import Dialect
 
-    palace_path = os.path.expanduser(args.palace) if args.palace else MempalaceConfig().palace_path
+    palace_path = (
+        os.path.expanduser(args.palace)
+        if args.palace
+        else MempalaceConfig().palace_path
+    )
 
     # Load dialect (with optional entity config)
     config_path = args.config
@@ -328,7 +368,11 @@ def cmd_compress(args):
     offset = 0
     while True:
         try:
-            kwargs = {"include": ["documents", "metadatas"], "limit": _BATCH, "offset": offset}
+            kwargs = {
+                "include": ["documents", "metadatas"],
+                "limit": _BATCH,
+                "offset": offset,
+            }
             if where:
                 kwargs["where"] = where
             batch = col.get(**kwargs)
@@ -386,7 +430,9 @@ def cmd_compress(args):
     # Store compressed versions (unless dry-run)
     if not args.dry_run:
         try:
-            comp_col = client.get_or_create_collection("mempalace_compressed")
+            comp_col = client.get_or_create_collection(
+                "mempalace_compressed", metadata={"hnsw:space": "cosine"}
+            )
             for doc_id, compressed, meta, stats in compressed_entries:
                 comp_meta = dict(meta)
                 comp_meta["compression_ratio"] = round(stats["size_ratio"], 1)
@@ -431,7 +477,9 @@ def main():
     p_init = sub.add_parser("init", help="Detect rooms from your folder structure")
     p_init.add_argument("dir", help="Project directory to set up")
     p_init.add_argument(
-        "--yes", action="store_true", help="Auto-accept all detected entities (non-interactive)"
+        "--yes",
+        action="store_true",
+        help="Auto-accept all detected entities (non-interactive)",
     )
 
     # mine
@@ -443,7 +491,9 @@ def main():
         default="projects",
         help="Ingest mode: 'projects' for code/docs (default), 'convos' for chat exports",
     )
-    p_mine.add_argument("--wing", default=None, help="Wing name (default: directory name)")
+    p_mine.add_argument(
+        "--wing", default=None, help="Wing name (default: directory name)"
+    )
     p_mine.add_argument(
         "--no-gitignore",
         action="store_true",
@@ -460,7 +510,9 @@ def main():
         default="mempalace",
         help="Your name — recorded on every drawer (default: mempalace)",
     )
-    p_mine.add_argument("--limit", type=int, default=0, help="Max files to process (0 = all)")
+    p_mine.add_argument(
+        "--limit", type=int, default=0, help="Max files to process (0 = all)"
+    )
     p_mine.add_argument(
         "--dry-run", action="store_true", help="Show what would be filed without filing"
     )
@@ -482,7 +534,9 @@ def main():
     p_compress = sub.add_parser(
         "compress", help="Compress drawers using AAAK Dialect (~30x reduction)"
     )
-    p_compress.add_argument("--wing", default=None, help="Wing to compress (default: all wings)")
+    p_compress.add_argument(
+        "--wing", default=None, help="Wing to compress (default: all wings)"
+    )
     p_compress.add_argument(
         "--dry-run", action="store_true", help="Preview compression without storing"
     )
@@ -491,8 +545,12 @@ def main():
     )
 
     # wake-up
-    p_wakeup = sub.add_parser("wake-up", help="Show L0 + L1 wake-up context (~600-900 tokens)")
+    p_wakeup = sub.add_parser(
-    p_wakeup.add_argument("--wing", default=None, help="Wake-up for a specific project/wing")
+        "wake-up", help="Show L0 + L1 wake-up context (~600-900 tokens)"
+    )
+    p_wakeup.add_argument(
+        "--wing", default=None, help="Wake-up for a specific project/wing"
+    )
 
     # split
     p_split = sub.add_parser(
@@ -544,13 +602,17 @@ def main():
     )
     instructions_sub = p_instructions.add_subparsers(dest="instructions_name")
     for instr_name in ["init", "search", "mine", "help", "status"]:
-        instructions_sub.add_parser(instr_name, help=f"Output {instr_name} instructions")
+        instructions_sub.add_parser(
+            instr_name, help=f"Output {instr_name} instructions"
+        )
 
     # repair
     sub.add_parser(
         "repair",
         help="Rebuild palace vector index from stored data (fixes segfaults after corruption)",
-    ).add_argument("--yes", action="store_true", help="Skip confirmation for destructive changes")
+    ).add_argument(
+        "--yes", action="store_true", help="Skip confirmation for destructive changes"
+    )
 
     # mcp
     sub.add_parser(

mempalace/migrate.py

@@ -33,13 +33,15 @@ def extract_drawers_from_sqlite(db_path: str) -> list:
     conn.row_factory = sqlite3.Row
 
     # Get all embedding IDs and their documents
-    rows = conn.execute("""
+    rows = conn.execute(
+        """
         SELECT e.embedding_id,
                MAX(CASE WHEN em.key = 'chroma:document' THEN em.string_value END) as document
         FROM embeddings e
         JOIN embedding_metadata em ON em.id = e.id
         GROUP BY e.embedding_id
-    """).fetchall()
+    """
+    ).fetchall()
 
     drawers = []
     for row in rows:
@@ -95,7 +97,9 @@ def detect_chromadb_version(db_path: str) -> str:
         # 0.6.x has embeddings_queue but no schema_str
         tables = [
             r[0]
-            for r in conn.execute("SELECT name FROM sqlite_master WHERE type='table'").fetchall()
+            for r in conn.execute(
+                "SELECT name FROM sqlite_master WHERE type='table'"
+            ).fetchall()
         ]
         if "embeddings_queue" in tables:
             return "0.6.x"
@@ -207,7 +211,9 @@ def migrate(palace_path: str, dry_run: bool = False, confirm: bool = False):
     temp_palace = tempfile.mkdtemp(prefix="mempalace_migrate_")
     print(f"  Creating fresh palace in {temp_palace}...")
     client = chromadb.PersistentClient(path=temp_palace)
-    col = client.get_or_create_collection("mempalace_drawers")
+    col = client.get_or_create_collection(
+        "mempalace_drawers", metadata={"hnsw:space": "cosine"}
+    )
 
     # Re-import in batches
     batch_size = 500

tests/conftest.py

@@ -101,7 +101,9 @@ def config(tmp_dir, palace_path):
 def collection(palace_path):
     """A ChromaDB collection pre-seeded in the temp palace."""
     client = chromadb.PersistentClient(path=palace_path)
-    col = client.get_or_create_collection("mempalace_drawers")
+    col = client.get_or_create_collection(
+        "mempalace_drawers", metadata={"hnsw:space": "cosine"}
+    )
     yield col
     client.delete_collection("mempalace_drawers")
     del client
@@ -185,7 +187,9 @@ def seeded_kg(kg):
     kg.add_triple("Alice", "parent_of", "Max", valid_from="2015-04-01")
     kg.add_triple("Max", "does", "swimming", valid_from="2025-01-01")
     kg.add_triple("Max", "does", "chess", valid_from="2024-06-01")
-    kg.add_triple("Alice", "works_at", "Acme Corp", valid_from="2020-01-01", valid_to="2024-12-31")
+    kg.add_triple(
+        "Alice", "works_at", "Acme Corp", valid_from="2020-01-01", valid_to="2024-12-31"
+    )
     kg.add_triple("Alice", "works_at", "NewCo", valid_from="2025-01-01")
 
     return kg

tests/test_backends.py

@@ -82,6 +82,20 @@ def test_chroma_backend_create_true_creates_directory_and_collection(tmp_path):
     client.get_collection("mempalace_drawers")
 
 
+def test_chroma_backend_creates_collection_with_cosine_distance(tmp_path):
+    palace_path = tmp_path / "palace"
+
+    ChromaBackend().get_collection(
+        str(palace_path),
+        collection_name="mempalace_drawers",
+        create=True,
+    )
+
+    client = chromadb.PersistentClient(path=str(palace_path))
+    col = client.get_collection("mempalace_drawers")
+    assert col.metadata.get("hnsw:space") == "cosine"
+
+
 def test_fix_blob_seq_ids_converts_blobs_to_integers(tmp_path):
     """Simulate a ChromaDB 0.6.x database with BLOB seq_ids and verify repair."""
     db_path = tmp_path / "chroma.sqlite3"

tests/test_mcp_server.py

@@ -30,7 +30,12 @@ def _get_collection(palace_path, create=False):
 
     client = chromadb.PersistentClient(path=palace_path)
     if create:
-        return client, client.get_or_create_collection("mempalace_drawers")
+        return (
+            client,
+            client.get_or_create_collection(
+                "mempalace_drawers", metadata={"hnsw:space": "cosine"}
+            ),
+        )
     return client, client.get_collection("mempalace_drawers")
 
 
@@ -92,7 +97,9 @@ class TestHandleRequest:
     def test_notifications_initialized_returns_none(self):
         from mempalace.mcp_server import handle_request
 
-        resp = handle_request({"method": "notifications/initialized", "id": None, "params": {}})
+        resp = handle_request(
+            {"method": "notifications/initialized", "id": None, "params": {}}
+        )
         assert resp is None
 
     def test_ping_returns_empty_result(self):
@@ -113,7 +120,9 @@ class TestHandleRequest:
         assert "mempalace_add_drawer" in names
         assert "mempalace_kg_add" in names
 
-    def test_null_arguments_does_not_hang(self, monkeypatch, config, palace_path, seeded_kg):
+    def test_null_arguments_does_not_hang(
+        self, monkeypatch, config, palace_path, seeded_kg
+    ):
         """Sending arguments: null should return a result, not hang (#394)."""
         _patch_mcp_server(monkeypatch, config, seeded_kg)
         from mempalace.mcp_server import handle_request
@@ -218,7 +227,9 @@ class TestReadTools:
         assert result["total_drawers"] == 0
         assert result["wings"] == {}
 
-    def test_status_with_data(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_status_with_data(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_status
 
@@ -235,7 +246,9 @@ class TestReadTools:
         assert result["wings"]["project"] == 3
         assert result["wings"]["notes"] == 1
 
-    def test_list_rooms_all(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_list_rooms_all(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_list_rooms
 
@@ -244,7 +257,9 @@ class TestReadTools:
         assert "frontend" in result["rooms"]
         assert "planning" in result["rooms"]
 
-    def test_list_rooms_filtered(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_list_rooms_filtered(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_list_rooms
 
@@ -252,7 +267,9 @@ class TestReadTools:
         assert "backend" in result["rooms"]
         assert "planning" not in result["rooms"]
 
-    def test_get_taxonomy(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_get_taxonomy(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_get_taxonomy
 
@@ -273,7 +290,9 @@ class TestReadTools:
 
 
 class TestSearchTool:
-    def test_search_basic(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_search_basic(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_search
 
@@ -284,14 +303,18 @@ class TestSearchTool:
         top = result["results"][0]
         assert "JWT" in top["text"] or "authentication" in top["text"].lower()
 
-    def test_search_with_wing_filter(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_search_with_wing_filter(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_search
 
         result = tool_search(query="planning", wing="notes")
         assert all(r["wing"] == "notes" for r in result["results"])
 
-    def test_search_with_room_filter(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_search_with_room_filter(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_search
 
@@ -310,7 +333,9 @@ class TestSearchTool:
         assert "results" in result
 
         # Old name takes precedence when both provided
-        result_strict = tool_search(query="JWT", max_distance=999.0, min_similarity=0.01)
+        result_strict = tool_search(
+            query="JWT", max_distance=999.0, min_similarity=0.01
+        )
         result_loose = tool_search(query="JWT", max_distance=0.01, min_similarity=999.0)
         assert len(result_strict["results"]) <= len(result_loose["results"])
 
@@ -318,7 +343,7 @@ class TestSearchTool:
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace import mcp_server
 
-        monkeypatch.setattr(mcp_server, "_get_collection", lambda *args, **kwargs: pytest.fail())
+        monkeypatch.setattr(mcp_server, "_get_collection", lambda: pytest.fail())
 
         result = mcp_server.tool_list_rooms(wing="../etc/passwd")
         assert "error" in result
@@ -327,7 +352,7 @@ class TestSearchTool:
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace import mcp_server
 
-        monkeypatch.setattr(mcp_server, "search_memories", lambda *args, **kwargs: pytest.fail())
+        monkeypatch.setattr(mcp_server, "search_memories", lambda: pytest.fail())
 
         result = mcp_server.tool_search(query="JWT", room="../backend")
         assert "error" in result
@@ -336,7 +361,7 @@ class TestSearchTool:
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace import mcp_server
 
-        monkeypatch.setattr(mcp_server, "_get_collection", lambda *args, **kwargs: pytest.fail())
+        monkeypatch.setattr(mcp_server, "_get_collection", lambda: pytest.fail())
 
         result = mcp_server.tool_list_drawers(wing="../notes")
         assert "error" in result
@@ -345,7 +370,7 @@ class TestSearchTool:
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace import mcp_server
 
-        monkeypatch.setattr(mcp_server, "_get_collection", lambda *args, **kwargs: pytest.fail())
+        monkeypatch.setattr(mcp_server, "_get_collection", lambda: pytest.fail())
 
         result = mcp_server.tool_find_tunnels(wing_a="../project")
         assert "error" in result
@@ -402,7 +427,9 @@ class TestWriteTools:
         assert result2["success"] is True
         assert result2["reason"] == "already_exists"
 
-    def test_add_drawer_shared_header_no_collision(self, monkeypatch, config, palace_path, kg):
+    def test_add_drawer_shared_header_no_collision(
+        self, monkeypatch, config, palace_path, kg
+    ):
         """Documents sharing a >100-char header must get distinct IDs (full-content hash)."""
         _patch_mcp_server(monkeypatch, config, kg)
         _client, _col = _get_collection(palace_path, create=True)
@@ -414,7 +441,10 @@ class TestWriteTools:
             header
             + "Decision: Use PostgreSQL for primary storage. Rationale: ACID compliance required."
         )
-        doc2 = header + "Decision: Use Redis for session caching. Rationale: sub-ms latency needed."
+        doc2 = (
+            header
+            + "Decision: Use Redis for session caching. Rationale: sub-ms latency needed."
+        )
 
         result1 = tool_add_drawer(wing="work", room="decisions", content=doc1)
         result2 = tool_add_drawer(wing="work", room="decisions", content=doc2)
@@ -425,7 +455,9 @@ class TestWriteTools:
             result1["drawer_id"] != result2["drawer_id"]
         ), "Documents with shared header but different content must have distinct drawer IDs"
 
-    def test_delete_drawer(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_delete_drawer(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_delete_drawer
 
@@ -433,14 +465,18 @@ class TestWriteTools:
         assert result["success"] is True
         assert seeded_collection.count() == 3
 
-    def test_delete_drawer_not_found(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_delete_drawer_not_found(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_delete_drawer
 
         result = tool_delete_drawer("nonexistent_drawer")
         assert result["success"] is False
 
-    def test_check_duplicate(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_check_duplicate(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_check_duplicate
 
@@ -469,14 +505,18 @@ class TestWriteTools:
         assert result["room"] == "backend"
         assert "JWT tokens" in result["content"]
 
-    def test_get_drawer_not_found(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_get_drawer_not_found(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_get_drawer
 
         result = tool_get_drawer("nonexistent_drawer")
         assert "error" in result
 
-    def test_list_drawers(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_list_drawers(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_list_drawers
 
@@ -504,7 +544,9 @@ class TestWriteTools:
         assert result["count"] == 2
         assert all(d["room"] == "backend" for d in result["drawers"])
 
-    def test_list_drawers_pagination(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_list_drawers_pagination(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_list_drawers
 
@@ -522,7 +564,9 @@ class TestWriteTools:
         result = tool_list_drawers(offset=-5)
         assert result["offset"] == 0
 
-    def test_update_drawer_content(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_update_drawer_content(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_update_drawer, tool_get_drawer
 
@@ -540,19 +584,25 @@ class TestWriteTools:
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_update_drawer
 
-        result = tool_update_drawer("drawer_proj_backend_aaa", wing="new_wing", room="new_room")
+        result = tool_update_drawer(
+            "drawer_proj_backend_aaa", wing="new_wing", room="new_room"
+        )
         assert result["success"] is True
         assert result["wing"] == "new_wing"
         assert result["room"] == "new_room"
 
-    def test_update_drawer_not_found(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_update_drawer_not_found(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_update_drawer
 
         result = tool_update_drawer("nonexistent_drawer", content="hello")
         assert result["success"] is False
 
-    def test_update_drawer_noop(self, monkeypatch, config, palace_path, seeded_collection, kg):
+    def test_update_drawer_noop(
+        self, monkeypatch, config, palace_path, seeded_collection, kg
+    ):
         _patch_mcp_server(monkeypatch, config, kg)
         from mempalace.mcp_server import tool_update_drawer
 

tests/test_miner.py

@@ -27,7 +27,8 @@ def test_project_mining():
         os.makedirs(project_root / "backend")
 
         write_file(
-            project_root / "backend" / "app.py", "def main():\n    print('hello world')\n" * 20
+            project_root / "backend" / "app.py",
+            "def main():\n    print('hello world')\n" * 20,
         )
         with open(project_root / "mempalace.yaml", "w") as f:
             yaml.dump(
@@ -59,7 +60,9 @@ def test_scan_project_respects_gitignore():
         write_file(project_root / ".gitignore", "ignored.py\ngenerated/\n")
         write_file(project_root / "src" / "app.py", "print('hello')\n" * 20)
         write_file(project_root / "ignored.py", "print('ignore me')\n" * 20)
-        write_file(project_root / "generated" / "artifact.py", "print('artifact')\n" * 20)
+        write_file(
+            project_root / "generated" / "artifact.py", "print('artifact')\n" * 20
+        )
 
         assert scanned_files(project_root) == ["src/app.py"]
     finally:
@@ -74,7 +77,9 @@ def test_scan_project_respects_nested_gitignore():
         write_file(project_root / ".gitignore", "*.log\n")
         write_file(project_root / "subrepo" / ".gitignore", "tasks/\n")
         write_file(project_root / "subrepo" / "src" / "main.py", "print('main')\n" * 20)
-        write_file(project_root / "subrepo" / "tasks" / "task.py", "print('task')\n" * 20)
+        write_file(
+            project_root / "subrepo" / "tasks" / "task.py", "print('task')\n" * 20
+        )
         write_file(project_root / "subrepo" / "debug.log", "debug\n" * 20)
 
         assert scanned_files(project_root) == ["subrepo/src/main.py"]
@@ -133,7 +138,9 @@ def test_scan_project_can_disable_gitignore():
         write_file(project_root / ".gitignore", "data/\n")
         write_file(project_root / "data" / "stuff.csv", "a,b,c\n" * 20)
 
-        assert scanned_files(project_root, respect_gitignore=False) == ["data/stuff.csv"]
+        assert scanned_files(project_root, respect_gitignore=False) == [
+            "data/stuff.csv"
+        ]
     finally:
         shutil.rmtree(tmpdir)
 
@@ -146,7 +153,9 @@ def test_scan_project_can_include_ignored_directory():
         write_file(project_root / ".gitignore", "docs/\n")
         write_file(project_root / "docs" / "guide.md", "# Guide\n" * 20)
 
-        assert scanned_files(project_root, include_ignored=["docs"]) == ["docs/guide.md"]
+        assert scanned_files(project_root, include_ignored=["docs"]) == [
+            "docs/guide.md"
+        ]
     finally:
         shutil.rmtree(tmpdir)
 
@@ -215,7 +224,9 @@ def test_file_already_mined_check_mtime():
         palace_path = os.path.join(tmpdir, "palace")
         os.makedirs(palace_path)
         client = chromadb.PersistentClient(path=palace_path)
-        col = client.get_or_create_collection("mempalace_drawers")
+        col = client.get_or_create_collection(
+            "mempalace_drawers", metadata={"hnsw:space": "cosine"}
+        )
 
         test_file = os.path.join(tmpdir, "test.txt")
         with open(test_file, "w") as f:
@@ -269,7 +280,9 @@ def test_mine_dry_run_with_tiny_file_no_crash():
         project_root = Path(tmpdir).resolve()
 
         # One normal file and one that falls below MIN_CHUNK_SIZE
-        write_file(project_root / "good.py", "def main():\n    print('hello world')\n" * 20)
+        write_file(
+            project_root / "good.py", "def main():\n    print('hello world')\n" * 20
+        )
         write_file(project_root / "tiny.txt", "x")
 
         with open(project_root / "mempalace.yaml", "w") as f: