Anthropic carelessly killed a Claude Code feature users built on, no warning

Claude Code 2.1.323 stopped running the configurable `subagentStatusLine` command, which had customized each running subagent’s row in the terminal interface. The setting still loads, but is now described as deprecated and ineffective; users receive no startup warning or migration guidance. In 2.1.322, the custom row could show an agent’s context-window use, token and dollar costs, model and reasoning effort, status and runtime, errors, and prompt-cache activity. After the update, the same row shows little more than the agent name and current activity. The change affects Linux and macOS, while the previous release still works.

The issue argues that this removes the only built-in way to monitor such details for individual background agents, leaving users unable to tell which agent is consuming context or money, nearing its limit, or using an expensive model. The complainant also points to recent additions to the setting’s payload and documentation that encouraged users to build tools around it. Existing UI-mod render sites cannot customize agent-panel rows, and a related request for that capability remains unanswered. Another user reports losing visibility into token and cache use, nested agents, and external tools; their workaround is to pin the older version and disable automatic updates. The requested remedies are to restore the setting and its payload, or provide a replacement that renders into native agent rows, and to give advance warnings before removing documented features.