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Tools

Pydantic v2: validate data at the edges of your Python application
Pydantic turns type hints into fast runtime validation and serialisation. Here are the core patterns for API payloads, settings and LLM outputs, plus the v2 changes that trip people up.
RecallRun Editors · 2 Oct 2026 · 3 min read
Tech articles

Idempotency keys: making POST requests safe to retry
Networks fail halfway through requests. Here is how idempotency keys let clients retry payments, orders and other writes without creating duplicates, with a working FastAPI pattern.
RecallRun Editors · 20 Sept 2026 · 3 min read

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