fix(mcp): preview errors tell agents what to do instead (#13559)

Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
1e192b2558Theo Browne committed on 9/25/2026, 5:05:20 AM· committed by GitHubparent99641fd
4 files changedLine totals unavailable