Routine agents on Sonnet, strategic agents on Opus

Decision

Sentinel and Homeostasis run on claude-sonnet-4-6. All other 10 agents (orchestrators and strategic specialists) run on claude-opus-4-6 with effort=high

Rationale

Sentinel and Homeostasis execute checklist-based work (health checks, cleanup rotations) that does not need Opus reasoning. Strategic agents (orchestration, decomposition, analysis, communication) benefit from maximum reasoning capability. Cost savings on routine work without quality compromise.

Alternatives Rejected

Rejected: (1) All Opus — wasteful for routine work, (2) All Sonnet — insufficient for orchestration quality, (3) Haiku for routine — too low quality for operational decisions

Outcome

Pending