Sparta lets teams test their AI agents locally in exact replicas of the tools they touch, like Stripe, Zendesk, and Salesforce, so they see exactly what an agent does before it ever hits production. You can describe a scenario in plain English, and Sparta builds the test, even across multiple tools at once, then inject the worst case yourself, like an API key expiring 30 days out, to see if the agent holds up. Every run is deterministic and plugs right into your existing CI/CD pipeline, so shipping an agent that issues refunds or talks to customers comes with proof that it works, not a coin flip.