{"name":"Rystic","description":"Rystic builds local, stateful simulators of the third-party APIs your agents depend on — Stripe, GitHub, Kalshi — validated against the real service, and safe to reset, manipulate, and break.","url":"https://www.rystic.ai/mcp","version":"1.0.0","protocolVersion":"0.3","preferredTransport":"JSONRPC","supportedInterfaces":[{"url":"https://www.rystic.ai/mcp","protocolBinding":"MCP","protocolVersion":"2026-07-28"}],"provider":{"organization":"Rystic","url":"https://www.rystic.ai"},"documentationUrl":"https://www.rystic.ai/docs","capabilities":{"streaming":false,"pushNotifications":false},"defaultInputModes":["text/plain"],"defaultOutputModes":["text/plain"],"skills":[{"id":"rystic","name":"Rystic","description":"Use when writing or testing code that calls a third-party API — Slack, Stripe, GitHub, Plaid, Kalshi, Shopify, Salesforce — or connecting Slack MCP to a Harbor RL environment. Rystic simulators run locally, seed and reset state on demand, and inject failures like rate limits and 500s.","tags":["testing","api","simulator"],"url":"https://www.rystic.ai/.well-known/agent-skills/rystic/skill.md"}]}