Create app/main.

app/main.

@@ -0,0 +1,17 @@
+from fastapi import FastAPI
+from pydantic import BaseModel
+from app.agents.threat_modeling import build_agents
+
+app = FastAPI(title="Threat Modeling API")
+agents = build_agents()
+
+class ThreatRequest(BaseModel):
+    system_description: str
+    reference_text: str | None = None
+
+@app.post("/analyze")
+def analyze(req: ThreatRequest):
+    arch = agents["mapper"].run(req.system_description)
+    threats = agents["modeler"].run(req.system_description)
+    patterns = agents["extractor"].run(req.reference_text or "")
+    return {"architecture": arch, "threats": threats, "patterns": patterns}