Unclear Whether this lazy-loading change has any user-visible effect beyond internal structure is not stated.
What
When Claude Code checks that an MCP (Model Context Protocol) server's tool definitions conform to the JSON Schema draft 2020-12 standard, it now loads the validator function lazily from a separate bundled chunk of code, rather than constructing the validator instance directly every time.
Why
This is an internal implementation change to how the validator is obtained; if that validator ever fails to load, tool schema checks fail open (meaning they don't block the tool from being used), so the practical behavior for users should stay the same.
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The writer flagged doubt
Whether this lazy-loading change has any user-visible effect beyond internal structure is not stated.