agent-teams

# Agent Teams > **Experimental**: Agent teams require `CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1` and may change between Claude Code versions. > **BREAKING (Claude Code 2.1.178)**: The explicit `TeamCreate` / `TeamDelete` tools were **removed**. Every session now has **one implicit team** when `CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1` is set — there is nothing to create or tear down. The `team_name` parameter is still **accepted but ignored** on the tools that took it (e.g. `Agent`), so older invocations don't error; omit it in new code. Coordination is otherwise unchanged: spawn teammates with the `Agent` tool, coordinate with `SendMessage`, and track work with `TaskCreate`/`TaskList`/`TaskUpdate`. > **Task tools are opt-in on current models (Claude Code 2.1.233+).** `TaskCreate` / `TaskGet` / `TaskUpdate` / `TaskList` / `TodoWrite` are not exposed on Opus 4.8, Sonnet 5, Fable 5 / 5.1, Mythos 5 or newer unless the session opted in — see `.claude/rules/agentic-permissions.md` § "Standard Permission Sets" → "Task-tool availability" for the three opt-ins and the full semantics. On a session without one, a lead cannot create or assign shared tasks: set the variable, or coordinate via `SendMessage` alone and carry the task list in the lead's own message to each teammate. Check `TaskList` is callable before spawning teammates. For the worked setup examples, communication snippets, shutdown procedures, the worktree path-resolution recovery routine, and common dispatch patterns, see...