The experimental teammate/swarm functionality has been completely removed from this release. This includes:
TeammateTooland all spawn/assignTask operationsTeammateMailboxcommunication system- Swarm permission polling
- Plan mode swarm launching options
CLAUDE_CODE_AGENT_IDenvironment variable handling for teammates
If you were using the swarm feature, this functionality is no longer available. The agent/subagent system (Task tool) remains available as the supported method for multi-agent workflows.
Evidence
203 removed functions/variables related to teammate functionality, including TeammateMailbox, TeammateTool, swarm operations
Strings lifted out of the shipped bundle, so the claim above can be checked against them.