format-restricted
Category: Restriction — a keyword value outside the allowed set triggers this rule
Error Codes
| Profile | Code | Severity |
|---|---|---|
| openai.so.2026-04-30 | OAI-K-format-restricted | Forbid |
| anthropic.so.2026-04-30 | ANT-K-format-restricted | Forbid |
Description
Restrict 'format' values according to the active provider profile.
Provider Evidence
| Profile | Status | Source | Basis |
|---|---|---|---|
| anthropic.so.2026-04-30 | documented | Anthropic JSON Schema limitations | — |
| openai.so.2026-04-30 | documented | OpenAI supported formats | — |
Rationale
Provider profiles may enforce different behavior and severity for this rule; use the table below for the selected profile.
Bad Example
{ "type": "object", "format": "invalid-value", "properties": {} }
Good Example
{ "type": "object", "format": "date-time", "properties": {} }