Baldur

What it does

One decorator composes circuit breaker, retry, timeout, fallback, and idempotency, and a built-in console shows every breaker live. Zero-config to start; add Redis and workers share state. Django, FastAPI, Flask, Celery. Apache-2.0 core. tenacity and pybreaker give you the patterns. Baldur also answers what happens when retries run out, who notices a breaker is open, and how you replay a call that failed for good.

One line around your OpenAI, Anthropic or Gemini client: your workers share the provider

Every worker retries into the same 429, hung calls tie up the pool, and the jobs that failed in the outage are gone. Wrap your client once: the workers share one wait, and every job the outage stopped is kept — and comes back. Measured against the Gemini API free tier, outage injected by a local proxy: every job that came back got a real model answer. Without it, a job out of retries is simply gone. Apache-2.0 core · OpenSSF Best Practices: passing · adapters for Django, FastAPI, Flask, and Celery The outage half of the demo's own output: the real openai SDK against a local fake provider, eight threads as the workers. Against the real Gemini API the same scene gave the…from baldur.sh

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  GitHubMar 2026 · github.com

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