Claude Code 2.1.299 introduces /effort and /fast commands in the agent view, opening a picker to set default session parameters, with /model also invoking the picker.
Claude Code 2.1.300 adds UI transcript view, /advisor, Slack Connect
The new $.ui.view({ agentId }) command opens an agent’s transcript in the main view, and $.ui.view({}) returns to the previous screen. A /advisor command is available on the Claude AWS platform, and it runs only after you select an advisor or enable it via a flag. Slack Connect channels can be enabled for Claude, and a private Allow-once/Deny card appears in threads for connector actions awaiting your approval.