Step-by-step tutorials you can build in an afternoon. Each one starts from a real failure, gives you runnable code, and tells you honestly where the approach breaks.

• Give Your Worker Queue Backpressure Before It Falls Over · September 26, 2026

  A step-by-step walkthrough: bounded queues, 429 with Retry-After, and a tiny adaptive limiter that keeps a Python worker alive under a flood.

• Put a Policy Gate in Front of Your AI Agent’s Tools · September 26, 2026

  A step-by-step walkthrough: intercept every tool call your AI agent makes with a small policy-as-code gate, deny by default, and audit everything.

• Add Idempotency Keys to Your API in an Afternoon · September 26, 2026

  A step-by-step walkthrough: add idempotency-key support to a Python API so retried requests never double-execute.