mcp: preserve transport errors in Write error chain#888
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maciej-kisiel merged 3 commits intomodelcontextprotocol:mainfrom Apr 24, 2026
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mcp: preserve transport errors in Write error chain
Custom RoundTrippers that return typed errors (e.g. for auth failures) have those errors flattened to strings by
%v, makingerrors.Asunusable for callers inspecting transport-level errors.This is inconsistent with the OAuth handler path (line 1807) which already uses
%wto preserve errors for client inspection.Relates to #579