MCP handler hides actionable operation errors, so agents cannot tell conflict from bad input from auth failure from rate limit and cannot follow the advertised recovery; the fix decodes an allowlisted set of structured API error codes.
From the Grok pain-radar digests, Oct 28-29 2026 (Oct 28 8:41 AM ET through Oct 29 early-morning Haitch editions). Verified live 2026-10-29: issue/PR read; title and state confirmed.