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Which MCP flag communicates that a tool call failed?

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Answer: A

isError signals tool failure back to the agent. errorCategory/isRetryable add structured detail; custom_id correlates batch requests.

`isError` ایجنٹ کو بتاتا ہے کہ ٹول ناکام ہوا۔ `errorCategory`/`isRetryable` مزید صاف تفصیل دیتے ہیں؛ اور `custom_id` batch کی درخواستوں کو آپس میں جوڑتا ہے۔

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