Reject oversized error delivery with explicit omission metadata, account for JSON escaping, and retain source observations and their lookup after failure. Reproduce and verify the real MCP path without claiming model-token savings from byte counts.
Co-authored-by: gensokyo-dev <342580529+gensokyo-dev@users.noreply.github.com>
Co-authored-by: Kaoru0822 <208281322+kaoru0822-kitauji@users.noreply.github.com>
