YC F26's Rystic launches local Slack/Stripe/S3 copies for realistic agent testing
ycombinator · x · 2026-10-27
Rystic (YC F26) launches to fix agent testing: mocks aren't realistic enough and sandboxes don't scale. It runs local copies of Slack, Stripe, S3 and more of your stack, letting teams save scenarios, inject faults, and run tests at scale — a new piece of infrastructure for agent eval engineering.
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