Unclear It is not clear what kinds of input the Agent tool's new adjustment step accepts or corrects.
SendMessage is the tool Claude uses to pass a message to another agent working in the same session. Its recipient field now carries a description that tells the model what to put there: the name or ID of an agent in the current session, or "main" when a subagent (a helper agent that Claude starts to work on part of a task) is writing back to the main conversation.
The Agent tool, which Claude uses to start subagents, also gains a step that adjusts the input it receives before using it. The overall descriptions of both tools are unchanged in the capture taken under this release.
The model gets clearer guidance on how to address messages, and the Agent tool should be more forgiving of input that is not quite in the expected shape.
It is not clear what kinds of input the `Agent` tool's new adjustment step accepts or corrects.