Claude Code turns subagent forking on, adds cross-session @-mentions
The same releases add GitLab merge requests, per-user spend attribution and Bash memory limits — and quietly deprecate the todo tools on newer models.
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Subagent forking is on by default
In v2.1.232, forked subagents now inherit your full conversation instead of starting cold, so parallel agents pick up the task's context automatically. It's the default now — multi-agent runs need far less hand-holding.
@-mention another live session
Type @ and a session name and Claude reaches that session directly via SendMessage, so you can hand work between two running sessions without copy-pasting. It shipped alongside the forking change.
GitLab pulls even with GitHub
v2.1.233 wires GitLab merge-request URLs into the --worktree flag and the agents view, and adds secret redaction for GitLab token families. If your team lives on GitLab, the worktree flow finally works end to end.
The todo tools were quietly deprecated
The same release disables the built-in todo/task-tracking tools on newer models unless you explicitly re-enable them. If your agents or prompts lean on TodoWrite, test them — the behavior changed without fanfare.
Spend attribution and Bash memory caps
v2.1.233 can forward a user identity for per-seat spend attribution, and lets you cap memory on the Bash tool so a runaway build no longer freezes your session. Small, but they matter for teams and long agent runs.
Elsewhere: Imagen 4 shuts off tomorrow
Google removes imagen-4.0-generate-001, -ultra- and -fast- from the Gemini API on Aug 17. If you call Imagen 4 in production, migrate to the current Gemini image endpoints today or those calls start failing.