Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
SubagentsArea: what it touches
Internal ChangesKind: in v2.1.288,
Internal ChangesSection of the release
What
The Agent tool's description tells Claude that the available agent types are listed in reminder messages in the conversation. That text now comes from a shared source instead of being written in place. The Agent tool is what Claude uses to hand work to a subagent, a separate helper Claude with its own task.
Why
In practice nothing changes for you. The Agent tool description captured under this release is unchanged from the previous release across the models checked.
