M11 solution

The expected, fully-commented artifacts for M11's lab. Peek only after you've tried.

File	What it is
app.py	The deployable service: FastAPI with /health and POST /chat, request validation, and latency + token-usage logging.
Dockerfile	Packages the app into a container (Python 3.12 base, deps installed, uvicorn entrypoint).
.dockerignore	Keeps .env and clutter out of the image.
requirements.txt	The app's own dependencies (what the Dockerfile installs).

Run it

Local (no Docker):

pip install -r requirements.txt
uvicorn app:app --reload          # → http://127.0.0.1:8000/docs

Container:

docker build -t ai-app .
docker run -p 8000:8000 --env-file .env ai-app

Both need your ANTHROPIC_API_KEY in .env. The key is passed at run time, never baked in.

How this was verified

• FastAPI app verified for real with FastAPI's TestClient (the model call mocked, no key): GET /health → 200 {"status":"ok"}; POST /chat {"message":...} → 200 {"reply":...} with a latency=… in_tokens=… out_tokens=… log line; a malformed body → 422 (validation works).
• Dockerfile checked structurally: Python 3.12-slim base, deps installed before code (layer caching), uvicorn entrypoint, .env excluded via .dockerignore, and no key baked in (passed at run time with --env-file).

Docker build/run not executed here (no Docker daemon in the build sandbox), pilot docker build / docker run on a machine with Docker. The live /chat call also needs a real key (the learner's run). No API key or billed call was used here.