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skills/api-design-standards/reference/fastapi-setup.md

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+# FastAPI Setup
+
+**Complete main application configuration.**
+
+```python
+# app/main.py
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+import os
+
+app = FastAPI(
+    title="Grey Haven API",
+    description="RESTful API for multi-tenant SaaS",
+    version="1.0.0",
+    docs_url="/docs",
+    redoc_url="/redoc",
+)
+
+# CORS
+allowed_origins = os.getenv("CORS_ALLOWED_ORIGINS", "").split(",")
+app.add_middleware(CORSMiddleware, allow_origins=allowed_origins, allow_credentials=True)
+
+# Exception handlers (see error-handlers.md)
+# app.add_exception_handler(...)
+
+# Include routers
+app.include_router(users.router)
+
+@app.get("/health")
+async def health_check():
+    return {"status": "healthy"}
+```
+
+**Doppler config:** `doppler run --config dev -- uvicorn app.main:app --reload`