debugging

Anthropic confirmed three separate system changes in March and April degraded Claude Code, Claude Agent SDK, and Claude Cowork performance. The company reduced default reasoning effort from high to medium on March 4, introduced a caching bug on March 26 that cleared session data with every turn, and added restrictive word limits on April 16 that caused a 3% performance drop.

GitHub has updated Copilot Chat on github.com with improved stack trace recognition. The enhancement helps developers identify error root causes faster when debugging by more reliably parsing pasted stack traces.