Nothing to try yetTier: how much it should matter to you
3Useful: my rating, 1 to 5
5Signal: worth watching, 1 to 5
SubagentsArea: what it touches
In DevelopmentKind: in v2.1.242,
What probably matters to youSection of the release
An agent.spawn hook with deny and model-swap power exists, answerable only by the disabled plugin modules.
What
Before spawning a subagent, Claude Code now runs an agent.spawn hook carrying the tool use id, prompt, subagent type, model, permission mode, and whether the spawn is background, forked, and its working directory. A deny aborts the launch and is recorded as subagent_spawn_denied_by_hook. The hook may also swap the model the subagent runs on.
Evidence
Subagent spawn denied by a plugin:
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
