Refactor Actor response to use structured content per MCP spec#745
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jirispilka wants to merge 1 commit intomasterfrom
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Refactor Actor response to use structured content per MCP spec#745jirispilka wants to merge 1 commit intomasterfrom
jirispilka wants to merge 1 commit intomasterfrom
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Per MCP spec 2025-11-25, a tool returning structuredContent SHOULD also return the serialized JSON in a TextContent block. content[0] was JSON.stringify(previewItems) — only part of structuredContent — so backwards-compat clients saw a different payload than structured clients. Make content[0] = JSON.stringify(structuredContent). Keep the human-readable metadata/instructions block as content[1] (unchanged content, still at the end). Move the empty-preview note into structuredContent.instructions so structuredContent-only clients see it. Narrow fix for #709. Broader tool-result standardization tracked in #744.
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Summary
Refactored
buildActorResponseContentto align with MCP spec 2025-11-25 by returning structured content as the canonical data payload, with backwards-compatibility support for clients that don't yet support structured content.Key Changes
structuredContentobject containingrunId,datasetId,totalItemCount,items, andinstructionsas the canonical response payloadstructuredContentas the first TextContent block per MCP spec recommendations for clients that don't support structured content yetemptyPreviewNotevariable that's included in instructionsImplementation Details
structuredContent(structured data) andcontentarray (text blocks for LLM consumption)https://claude.ai/code/session_01XqXmsBHXsMi5ycLsWm7AUX