Create disgenet.py

mcp/disgenet.py

@@ -0,0 +1,23 @@
+# mcp/disgenet.py
+"""
+DisGeNET disease–gene associations.
+"""
+
+import os, httpx
+from typing import List, Dict
+
+DISGENET_KEY = os.getenv("DISGENET_KEY")
+HEADERS = {"Authorization": f"Bearer {DISGENET_KEY}"} if DISGENET_KEY else {}
+
+BASE = "https://www.disgenet.org/api"
+
+async def disease_to_genes(disease_name: str, limit: int = 10) -> List[Dict]:
+    """
+    Return top gene associations for a disease.
+    """
+    url = f"{BASE}/gda/disease/{disease_name.lower()}"
+    async with httpx.AsyncClient(timeout=20, headers=HEADERS) as client:
+        r = await client.get(url, params={"source": "ALL", "format": "json"})
+        r.raise_for_status()
+        data = r.json()
+        return data[:limit]