Create opentargets.py

mcp/opentargets.py

@@ -0,0 +1,15 @@
+### `opentargets.py` – tractability & constraint  
+```python
+import os, httpx, textwrap, asyncio
+from functools import lru_cache
+_URL="https://api.platform.opentargets.org/api/v4/graphql"
+_HDR={"Content-Type":"application/json","Accept":"application/json"}
+if os.getenv("OT_KEY"): HDR["Authorization"]="Bearer "+os.getenv("OT_KEY")
+_Q=textwrap.dedent("""query Q($g:String!,$n:Int){associations(geneSymbol:$g,size:$n){rows{score datatypeId disease{id name} target{id symbol}}}}""")
+@lru_cache(maxsize=512)
+async def fetch_ot(sym:str, n:int=30):
+    p={"query":_Q,"variables":{"g":sym,"n":n}}
+    async with httpx.AsyncClient(timeout=10,headers=_HDR) as c:
+        r=await c.post(_URL,json=p); 
+        return r.json()["data"]["associations"]["rows"]
+``` :contentReference[oaicite:9]{index=9