Anthropic Releases /skill-doctor to Audit Unused Claude Code Skills

Anthropic released /skill-doctor on September 4, 2026, a new command that identifies unused skills in Claude Code and reveals their hidden context costs, enabling developers to optimize their token usage across sessions. The tool addresses a growing problem for power users: as project-specific skills accumulate, their descriptions consume context window space on every conversation turn regardless of whether the skills are actually invoked.