LangWatch

LangWatch | Confidence for the AI Agent Era

LangWatch is the agent testing platform for teams shipping AI agents that have to work in the real world.

Agents don't fail like models do. They fail across turns — a wrong tool call, a dropped context, a reasonable-looking answer that's quietly wrong. You can't catch that by watching dashboards after the fact. You catch it by simulating your agent against realistic scenarios before it ever reaches a user, and re-running those scenarios every time you change something.

That's what LangWatch does.

Agent Simulations – Test your agents against realistic, multi-turn scenarios — text and voice — before you ship. Powered by Scenario, our open-source agent testing framework.

Evaluations – Turn every simulation into a repeatable eval, so regressions get caught the moment they appear, not in production.

Pre-Production Testing – Validate prompts, models, and full agent pipelines against your scenarios before going live.

AI Governance – Guardrails, audit trails, and compliance for teams in regulated industries.

Observability – And when something does slip through, full traces of every prompt, tool call, and decision to debug it fast.

Trusted by enterprises and AI-first teams — including Deloitte, Backbase, Danske Bank, and PagBank — to ship AI agents that are reliable, safe, and ready for production.