Show HN: Worlds, local replicas of Stripe and Zendesk for testing AI agents

Category: devtools

Tags: ai-agents, testing, simulation, saas-mocking, agent-evaluation

Score: 6.0/10 (Innovation: 7, Technical: 5, Documentation: 3, Utility: 6)

Sparta Worlds provides local replicas of SaaS services like Stripe and Zendesk so developers can test AI agents against simulated environments with real state, deterministic rules, and replayable scenarios. The idea of pairing isolated fake backends with success-rule validation and time-travel testing is a genuinely useful primitive for agent evaluation, though the current public materials are a walkthrough rather than a documented codebase.

Target audience: AI engineers, backend developers, and QA teams building or evaluating autonomous agents

Repository: https://www.usesparta.co/

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