feat(core): MCP Server - Capture prompt results from prompt function calls #17284
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packages/core/src/integrations/mcp-server/attributeExtraction.ts
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packages/core/src/integrations/mcp-server/attributeExtraction.ts
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| if (typeof source.name === 'string') partyInfo.name = source.name; | ||
| if (typeof source.title === 'string') partyInfo.title = source.title; | ||
| if (typeof source.version === 'string') partyInfo.version = source.version; |
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l: I prefer if avoid inline conditionals as it makes future diffs easier to read. With the version below, intent when git blaming when we change the condition vs. changing the setter is more clear
Ditto everywhere else in the code that this happens.
| if (typeof source.name === 'string') partyInfo.name = source.name; | |
| if (typeof source.title === 'string') partyInfo.title = source.title; | |
| if (typeof source.version === 'string') partyInfo.version = source.version; | |
| if (typeof source.name === 'string') { | |
| partyInfo.name = source.name; | |
| } | |
| if (typeof source.title === 'string') { | |
| partyInfo.title = source.title; | |
| } | |
| if (typeof source.version === 'string') { | |
| partyInfo.version = source.version; | |
| } |
| if (typeof item !== 'object' || item === null) continue; | ||
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| const contentItem = item as Record<string, unknown>; |
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l: generally I prefer if we use functions to type narrow instead of casts, but feel free not to change.
function isValidContentItem(item: unknown): item is Record<string, unknown> {
return item != null && typeof item === 'object';
}if (!isValidContentItem(item)) {
return;
}
// continue with rest of code.|
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| if (typeof contentItem.text === 'string') { | ||
| const text = contentItem.text; | ||
| const maxLength = 500; |
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l: Let's extract maxLength out of the function body and give it a bit more of a descriptive name.
| safeSet('name', contentItem.name); | ||
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| if (typeof contentItem.text === 'string') { | ||
| const text = contentItem.text; |
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l: if we're going to do this, I would prefer if we just destructure it above, and use it in here.
const { text } = contentItem;
| if (typeof contentItem.text === 'string') { | ||
| const text = contentItem.text; | ||
| const maxLength = 500; | ||
| attributes[`${prefix}.content`] = text.length > maxLength ? `${text.slice(0, maxLength - 3)}...` : text; |
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m: We have a truncate helper in the sdk that does this (though it doesn't do maxLength - 3 😬 - we need to fix that).
| let attributes: Record<string, string | number | boolean> = {}; | ||
| if (typeof result !== 'object' || result === null) return attributes; | ||
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| const resultObj = result as Record<string, unknown>; | ||
| if (typeof resultObj.isError === 'boolean') { | ||
| attributes[MCP_TOOL_RESULT_IS_ERROR_ATTRIBUTE] = resultObj.isError; | ||
| } | ||
| if (Array.isArray(resultObj.content)) { | ||
| attributes = { ...attributes, ...buildAllContentItemAttributes(resultObj.content) }; | ||
| } | ||
| return attributes; |
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| let attributes: Record<string, string | number | boolean> = {}; | |
| if (typeof result !== 'object' || result === null) return attributes; | |
| const resultObj = result as Record<string, unknown>; | |
| if (typeof resultObj.isError === 'boolean') { | |
| attributes[MCP_TOOL_RESULT_IS_ERROR_ATTRIBUTE] = resultObj.isError; | |
| } | |
| if (Array.isArray(resultObj.content)) { | |
| attributes = { ...attributes, ...buildAllContentItemAttributes(resultObj.content) }; | |
| } | |
| return attributes; | |
| if (!result || typeof result !== 'object') { | |
| return {}; | |
| }; | |
| const attributes = Array.isArray(resultObj.content) ? buildAllContentItemAttributes(resultObj.content) : {} | |
| if (typeof result.isError === 'boolean') { | |
| attributes[MCP_TOOL_RESULT_IS_ERROR_ATTRIBUTE] = result.isError; | |
| } | |
| return attributes; |
m: Generally I'd like us to follow code paths that look like the same, where we avoid spread operators (or similar obj/array mutations) until they are absolutely necessary. In this case, there's no need to spread buildAllContentItemAttributes into a new object.
closes #17283
includes these attributes for
mcp.serverspans:mcp.prompt.result.descriptionmcp.prompt.result.message_contentmcp.prompt.result.message_rolemcp.prompt.result.message_countExample:
Needed to make
attributeExtraction.ts<300 lines of code (requirement) so it's now split betweensessionExtraction.ts,sessionExtraction.tsandresultExtraction.ts.So changes explained so it's easier to review:
extractPromptResultAttributesinsideresultExtraction.ts.piiFiltering.ts. Just add them to theset.else if (method === 'prompts/get')to execute theextractPromptResultAttributesfunction.