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Bound MCP namespace descriptions - #35941
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## What changed - Limit model-facing MCP namespace descriptions to 1,000 bytes without splitting UTF-8 characters or mutating the stored server metadata. - Cap the aggregate source-description list in `tool_search` at 4 KiB while retaining source names and discovery instructions. - Cover direct and deferred MCP tool exposure, including multibyte descriptions and tool visibility. GitOrigin-RevId: 92736ec39475a1d6b3b03f5e3063e28225d8a5f6
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Bound MCP namespace descriptions
What changed
tool_searchat 4 KiB while retaining source names and discovery instructions.