- Recipe 01 Migrate from Opus The one-line model swap, and the five old habits that now return 400.
- Recipe 02 Agentic loops & tools The tool runner, the manual loop, and tool descriptions Fable actually triggers on.
- Recipe 03 Structured outputs Guaranteed-valid JSON with Pydantic or raw schemas — the replacement for prefills.
- Recipe 04 Prompt caching At $10/MTok input, caching is the difference between affordable and not.
- Recipe 05 Memory files Fable is unusually good at keeping notes. Give it somewhere to keep them.
- Recipe 06 Task budgets Give long agentic runs a token allowance the model can see and pace itself against.
Every recipe has a machine-readable twin in /api/cookbook.json. Found an error? The primary sources are the announcement and platform.claude.com/docs — trust those over us.