Remove structuredContent when isError is set - #185
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The 2026-07-28 spec is still silent on whether |
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The new version of MCP inspector surfaced a void in the MCP specification: should we return a
structuredContentthat does not conform tooutputSchemawhenisErroris set? The answer is, apparently, no: if we do, MCP inspector throws a validation error instead of displaying our own error. If that behaviour happens on a real LLM, they won't get the information the error is trying to convey. This is basically the same issue as the one covered by modelcontextprotocol/typescript-sdk#1945This PR thus removes
structuredContentfrom the payload wheneverisErroris set. The tests are adapted to make sure that the text error still contains all the relevant information.