fix(pydantic_ai): trace instructions and dynamic system prompts - #735
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Capture resolved instructions and system prompts on agent spans and preserve their structured representation on model spans across sync, async, and streaming paths.\n\nAdd VCR regression coverage for both supported Pydantic AI versions.
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Andrew Kent (realark)
approved these changes
Sep 4, 2026
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resolves https://linear.app/braintrustdata/issue/SDK-322/pydantic-ai-integration-drops-instructions-and-dynamic-system-prompts