Managed Agents: idle session billing details not publicly disclosed

Summary

Public docs for Managed Agents (platform.claude.com/docs/en/managed-agents/overview) describe sessions as stateful and resumable, with active-session runtime billed at $0.08/hour while status is "running". What is not publicly disclosed is the billing posture during idle/suspended state — e.g., a session that completed its initial fan-out but is being held open for potential resume.

Motivation / Use Case

Customers projecting cost for long-running coordinator sessions (e.g. "always-on overnight pipeline coordinator," 24x30x$0.08 = $57.60/mo if continuously billed) need to know whether idle minutes are charged. The answer changes the design pattern: if idle is free, hold sessions open; if idle is billed, tear down and re-spawn per work batch.

Surfaced during a 2026-05-22 customer evaluation where the cost projection had to be flagged with "idle billing details were not publicly disclosed at the time of writing — flag for Anthropic clarification before commitment."

Suggested Behavior

Add to the Managed Agents pricing / overview docs:

1. Per-state billing breakdown: running, idle/waiting, suspended, terminated.
2. Whether sessions automatically transition out of "running" when no specialist is active.
3. Whether explicit pause / suspend verbs exist and what their billing posture is.
4. Maximum idle window before automatic teardown.

This is the kind of small doc addition that unblocks several customer evaluations at once.