…calls (#17284) closes #17283 includes these attributes for `mcp.server` spans: - `mcp.prompt.result.description` - `mcp.prompt.result.message_content` - `mcp.prompt.result.message_role` - `mcp.prompt.result.message_count` Example: <img width="835" height="300" alt="Screenshot 2025-08-01 at 12 40 46" src="https://github.com/user-attachments/assets/592d876b-807a-4f3e-a9b2-406e10f5a83d" /> Needed to make `attributeExtraction.ts` <300 lines of code (requirement) so it's now split between `sessionExtraction.ts`, `sessionExtraction.ts` and `resultExtraction.ts`. So changes explained so it's easier to review: - The only function this PR adds is `extractPromptResultAttributes` inside `resultExtraction.ts`. - It adds the prompt results as PII in `piiFiltering.ts`. Just add them to the `set`. - adds a `else if (method === 'prompts/get')` to execute the `extractPromptResultAttributes` function. - adds a test that checks we're capturing the results and updates the PII test to check PII result attributes are being removed if sending PII is not enabled. (cherry picked from commit 0e05a40)

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MCP Server - capture prompt results from prompt function calls #17283

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