[Bug] Agent team tools not injected after auto-update to v2.1.178

What's wrong:

After a background auto-update to v2.1.178, the agent teams tools are no longer injected. Asking Claude to create a team returns that TeamCreate is not in the available toolset — no error, no "not available on this plan" message; it just silently falls back to regular subagents. The feature worked normally on the previous version.
Confirmed not the cause (already ruled out):

CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1 is set and verified live inside the session
settings.json is valid; flag is in the env block
Version is well above the v2.1.32 minimum
No proxy, no Bedrock, no Vertex, no custom ANTHROPIC_BASE_URL
Authenticated to the expected account/plan
Downgrading to a prior version restores the tools — which pins this to v2.1.178

Environment:

Claude Code: 2.1.178 (native installer)
OS: macOS
Install: native binary at ~/.local/bin/claude

Repro:

On v2.1.178 with CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1 set
Ask Claude to create an agent team
Result: TeamCreate reported as unavailable; falls back to subagents
Downgrade to the prior version → tools reappear

Expected: team tools injected whenever the flag is set and version ≥ 2.1.32, as documented.