New required fields added in schema BetaMessageDeltaUsage: [fallback_credit]

What changed

New required fields added in schema BetaMessageDeltaUsage: [fallback_credit] Affected surface: schema BetaMessageDeltaUsage. Root cause: schema `BetaMessageDeltaUsage`. Detected at Sat, 25 Jul 2026 06:57:43 UTC UTC.

Diff

{
  "added_required": [
    "fallback_credit"
  ],
  "path": "schema BetaMessageDeltaUsage",
  "schema_path": "schema BetaMessageDeltaUsage"
}

Likely impact

Existing integrations relying on this surface will fail or behave incorrectly. Treat this as a release-blocker until the recommended action below is applied.

Recommended action

Add the new required field to all request payloads or arguments. Requests omitting it will be rejected.