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maxLength

Category: Keyword — presence of a specific JSON Schema keyword triggers this rule

Error Codes​

ProfileCode
anthropic.so.2026-04-30ANT-K-maxLength

Description​

Flag usage of the 'maxLength' keyword, which is not supported by anthropic.so.2026-04-30

Rationale​

The anthropic.so.2026-04-30 structured-output provider rejects the 'maxLength' keyword. Schemas using this keyword may be rejected or silently altered.

Bad Example​

{ "type": "object", "maxLength": true, "properties": {} }

Good Example​

{
  "type": "object",
  "properties": {
    "name": { "type": "string" }
  }
}