Apply distributed-systems, messaging, and integration patterns to architectural decisions, message contracts, runbooks, and launch decisions for event-driven, microservice, queue, broker, saga, outbox, CDC, workflow, scaling, resilience, and multi-region work. Six slash commands (/design, /contract, /architecture, /runbook, /review, /prelaunch) produce durable artifacts under docs/features/<slug>/ and docs/system/. The skill does NOT generate implementation code or tests; that's your team's job in their normal dev environment. v0.6.0 simplification.
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