Tool input checks now enforce more JSON Schema rules

JSON Schema is a standard way to describe what shape some data should have, such as the inputs a tool accepts. When Claude Code turns these descriptions into checks, it now enforces rules it used to ignore:

• uniqueItems: no duplicates in a list, with an error saying which item repeats which
• contains, minContains, maxContains: a list must include matching items, within set limits
• minProperties, maxProperties: limits on how many fields an object has

The check for base64url text, a way of writing data as plain letters and numbers, is also stricter about padding length.