fix: narrow exception handling and fix float cast in hybrid search

- CoordinodePropertyGraphStore.__init__: set supports_vector_queries per
  instance based on callable(getattr(client, "vector_search", None)) so
  injected clients without vector_search() correctly advertise False instead
  of the unconditional class-level True
- refresh_schema(): add debug logging before _parse_schema() fallback so
  the swallowed exception remains observable; expand comment explaining why
  broad Exception is intentional (no hard grpc dependency in langchain package)
- hybrid_text_vector_search(): cast vector elements via [float(v) for v in
  vector] to match vector_search() and text_vector_search() convention;
  prevents breakage with numpy/decimal callers

Author: polaz

coordinode/coordinode/client.py

@@ -642,7 +642,7 @@ async def hybrid_text_vector_search(
         req = HybridTextVectorSearchRequest(
             label=label,
             text_query=text_query,
-            vector=list(vector),
+            vector=[float(v) for v in vector],
             limit=limit,
             text_weight=text_weight,
             vector_weight=vector_weight,

langchain-coordinode/langchain_coordinode/graph.py

@@ -4,10 +4,13 @@
 
 import hashlib
 import json
+import logging
 import re
 from collections.abc import Sequence
 from typing import Any
 
+logger = logging.getLogger(__name__)
+
 from langchain_community.graphs.graph_store import GraphStore
 
 from coordinode import CoordinodeClient
@@ -119,6 +122,15 @@ def refresh_schema(self) -> None:
                 # or another gRPC error if the schema service is not available in the
                 # deployed version.  Fall back to text-based schema parsing to avoid
                 # surfacing an unhandled exception to the caller.
+                # We catch broad Exception (rather than grpc.RpcError specifically)
+                # because langchain-coordinode does not take a hard grpc dependency —
+                # clients may be non-gRPC (e.g. coordinode-embedded LocalClient).
+                # The exception is logged at DEBUG so it remains observable without
+                # cluttering production output.
+                logger.debug(
+                    "get_labels()/get_edge_types() failed — falling back to _parse_schema()",
+                    exc_info=True,
+                )
                 structured = _parse_schema(self._schema)
         else:
             structured = _parse_schema(self._schema)

llama-index-coordinode/llama_index/graph_stores/coordinode/base.py

@@ -81,6 +81,11 @@ def __init__(
             raise TypeError("client must provide a callable cypher() method")
         self._owns_client = client is None
         self._client = client if client is not None else CoordinodeClient(addr, timeout=timeout)
+        # Advertise vector capability based on what the actual client exposes.
+        # Injected clients (e.g. bare coordinode-embedded LocalClient) may not
+        # implement vector_search(); claiming True unconditionally would mislead
+        # LlamaIndex into passing vector queries that silently return no results.
+        self.supports_vector_queries = callable(getattr(self._client, "vector_search", None))
 
     # ── Node operations ───────────────────────────────────────────────────