SKILL.md
Architecture Patterns
Use this skill when the task is larger than one function or trigger. Pick the pattern from the
requirement, then implement it with Function, Trigger, Worker, observers, state, queues,
streams, and pub/sub.
Pattern Map
| Requirement | Pattern | iii shape |
|---|---|---|
| Sequential work with retries, DLQ, step tracking | Durable workflow | Functions chained through named queues, progress in state |
| Keep views, metrics, cache, or clients in sync | Reactive backend | State triggers plus stream/pubsub side effects |
| React to another function's calls, results, or failures without changing it | Observer side effect | iii.observe({ function_id, on, filters }, target) (iii-observe) |
| Specialized AI agents hand work to each other | Agentic backend | One function per agent, queue handoffs, shared state |
| Commands publish events and projections update independently | Event-driven CQRS | Command functions, event log in state, subscribe triggers |
| Pure, traceable composition | Effect pipeline | Small functions composed synchronously with trigger() |
| Webhook/cron automation chains | Low-code automation | Trigger, transform, action nodes chained by enqueue |