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## Why Spawned agents can already override `model` and `reasoning_effort`, but they have no equivalent way to opt into a model-supported service tier. That makes it impossible to preserve or intentionally select tiered execution behavior when delegating work to a sub-agent, even though the model catalog already advertises supported `service_tiers`. ## What changed - Add optional `service_tier` to both legacy and `MultiAgentV2` `spawn_agent` tool inputs. - Show each picker-visible model's supported service tier ids and descriptions in the `spawn_agent` tool guidance. - Resolve service tier selection after the child agent's effective model is known. - Inherit the parent tier when omitted and still supported by the final child model; otherwise clear it. - Reject explicit unsupported tier requests with a model-facing error. - Keep explicit `service_tier` usable on full-history forks, while still honoring the existing model/reasoning fork restrictions. - Hide `service_tier` alongside other spawn metadata when `hide_spawn_agent_metadata` is enabled. ## Verification Added focused coverage for: - v1/v2 `spawn_agent` schema exposure for `service_tier` - tier descriptions in spawn guidance - hidden-metadata suppression - explicit supported tier selection - explicit unknown and unsupported tier rejection - inherited tier preservation or clearing based on child-model support - full-history fork acceptance for explicit service tiers in both v1 and v2 Local Rust tests were not run in this workspace per repo guidance; the new coverage is included for CI.