What
The Workflow tool lets Claude run a coordinated set of subagents, which are helper copies of Claude that each take part of a task. Its description now includes guidance on when to use it:
- The user has asked in their own words to orchestrate subagents.
- A notice confirms "ultracode", the keyword or session mode that asks for this.
- A skill or command the user invoked calls for it.
If a task would merely benefit from it, Claude is told to use another approach or ask instead.
In the stock Workflow description captured under v2.1.323, the lines about ultracode now say a "message from the system" confirms it, where the v2.1.322 capture said a "system-reminder".
Why
It changes how Claude decides whether to start a multi-agent workflow, so it should do so mainly when you have asked for one.