Preserve longer MCP source descriptions in tool search - #37066
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## Why The 4 KiB aggregate limit can truncate source metadata before it reaches the model through the tool search description. ## What changed Raise the aggregate source-description limit to 512 KiB while retaining the existing character-boundary-safe truncation and bounded output. ## Testing Expand unit and RMCP round-trip coverage to verify that substantially longer Unicode descriptions remain complete within the new limit. GitOrigin-RevId: 002760cdd2e8741e531b45f75f8624ef84334d24
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Preserve longer MCP source descriptions in tool search
Why
The 4 KiB aggregate limit can truncate source metadata before it reaches the
model through the tool search description.
What changed
Raise the aggregate source-description limit to 512 KiB while retaining the
existing character-boundary-safe truncation and bounded output.
Testing
Expand unit and RMCP round-trip coverage to verify that substantially longer
Unicode descriptions remain complete within the new limit.