Update mcp/gene_hub.py

mcp/gene_hub.py

@@ -1,18 +1,22 @@
-"""Unified gene resolver: MyGene ➜ Ensembl ➜ OpenTargets"""
-from mcp.mygene        import fetch_gene_info     # MyGene.info – 500 QPS tier :contentReference[oaicite:3]{index=3}
-from mcp.ensembl       import fetch_ensembl       # Ensembl REST xrefs endpoint :contentReference[oaicite:4]{index=4}
-from mcp.opentargets   import fetch_ot            # OT GraphQL v4 API :contentReference[oaicite:5]{index=5}
+"""
+gene_hub – resolve_gene() tries three sources in order of speed & richness.
+
+  1. MyGene.info (v3)  – 500 QPS key tier  :contentReference[oaicite:3]{index=3}
+  2. Ensembl REST      – key-less, species-agnostic  :contentReference[oaicite:4]{index=4}
+  3. Open Targets GQL  – tractability & constraint  :contentReference[oaicite:5]{index=5}
+"""
+
+from mcp.mygene      import fetch_gene_info
+from mcp.ensembl     import fetch_ensembl
+from mcp.opentargets import fetch_ot
 
 async def resolve_gene(symbol: str) -> dict:
-    """
-    Return the first non-empty gene record.
-    The order is chosen for speed & richness.
-    """
+    """Return first non-empty gene record; never raises."""
     for fn in (fetch_gene_info, fetch_ensembl, fetch_ot):
         try:
             data = await fn(symbol)
-            if data:           # truthy dict / list
+            if data:
                 return data
-        except Exception:
-            pass               # mute network hiccups
+        except Exception:            # network hiccup / 429 etc.
+            pass
     return {}