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## Why Custom agent roles are ordinary config layers, so a role file can already express `service_tier` just like other config values. The spawned-agent tier path needs to preserve that effective role config and follow the same precedence pattern as model/reasoning. ## What changed - Apply an explicit spawn-time `service_tier` onto the child config before role application, so a role config layer can override it just like role-defined model/reasoning settings do. - Validate the final effective child tier after the final child model is known, while still falling back to the parent tier when no child tier survives. - Add focused integration coverage for both v1 and v2 proving role TOML loads a service tier, spawned children keep that role-configured tier, and a role tier wins over a conflicting spawn-time tier. ## Validation - `just fmt` - `git diff --check` - Local Rust tests not run, per repo guidance; CI should exercise the new coverage.