Latches (Fan-Out / Fan-In)

A latch group lets a parent automation launch N child automations in parallel (fire-and-forget), then block until all N finish before continuing. Each child increments a counter on start and decrements on finish; the parent polls until the counter hits 0.

Claude reaches for this pattern when the intent mentions parallel execution, fan-out, fan-in, or latch groups. Builds on Execute Automation.

Scope

• My account — counter scoped to the owning account.
• Linked accounts — counter shared across linked accounts, allowing cross-account coordination.