Why AI Agents Fail at API Calls in Production (and How to Fix It)
Blog post about agent problems, not a tool that solves them.

Fork from failed agent runs and prove fixes before shipping—LangSmith doesn't do this.
Developers building production AI agents
LangSmith · Arize Phoenix · Helicone
Blog post about agent problems, not a tool that solves them.
Record production Python bugs and step backwards from crash to cause in VS Code.
Fork from step 8 and replay downstream — saves money when agents fail at step 9.
Turns every agent run into a verifiable artifact you can inspect offline, replay deterministically, and promote into a CI gate with one command. The combo of signed packs (Ed25519 + SHA-256), structural pack diffs, and a 'regress bootstrap' that produces JUnit fixtures is a pragmatic approach to taming tool-call side effects without replacing your agents. The repo ships demos, docs, and install scripts so this feels like a usable infra tool rather than a paper design.
Six-dimension audio scoring beats generic call quality monitors for voice AI.
Deterministic replay of agent runs without mocking—that's genuinely new.