mcp: preserve structured content number precision - #1239
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guglielmo-san merged 3 commits intoSep 16, 2026
Merged
guglielmo-san merged 3 commits into
guglielmo-san merged 3 commits into
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CallToolResult currently decodes structuredContent through an any field, which converts JSON numbers to float64 and silently rounds integers outside the IEEE-754 safe range.
This change decodes structuredContent separately with UseNumber, preserving wire numbers as json.Number while retaining the existing decoded object, array, and primitive shapes. The field documentation now describes that representation. Users who depend on the previous float64 behavior can temporarily restore it with MCPGODEBUG=structuredcontentfloat64=1.
An end-to-end in-memory client/server regression covers 9007199254740993 from a low-level Server.AddTool result. Additional coverage verifies the compatibility option restores the legacy rounded float64 value.
Verification:
Fixes #1236