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fix: preserve FastMCP tool error results
#4279
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test (3.10, lowest-direct, windows-latest)
fix: preserve FastMCP tool error results
fix: preserve FastMCP tool error results
#4279
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NOTICE: windows-latest requests are being redirected to windows-2025-vs2026 by June 15, 2026
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test (3.10, lowest-direct, windows-latest)
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