@HarryGlaser @TomO In version 3.3, they already added a selector for the subagent model. In Settings, there’s now a Subagents section with an Explore subagent model dropdown where you can pick the model explicitly see the screenshot below. If you want to try it right now, switch to nightly Settings → Beta → Update Channel: Nightly.
About cloud agents, the pool of available models for subagents is set by the environment, so the message opus-4.7 isn't in the list of available subagent models for this environment is expected. On the cloud side, the subagent is currently tied to composer-2-fast. This is a separate case from the IDE, we’ll flag it to the team separately. I can’t share an ETA.
For now, in the IDE on stable, the most reliable workaround to avoid creating subagents at all is using the subagentStart hook permission: "deny": Hooks | Cursor Docs