{"version":"2.1.170","anchor":"overageinuse-rate-limit-field","canonical_anchor":"overageinuse-rate-limit-field","heading":"overageInUse Rate Limit Field","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.170\/e\/overageinuse-rate-limit-field","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.170","markdown":"### `overageInUse` Rate Limit Field\n\nA new `overageInUse` boolean is parsed from the `anthropic-ratelimit-unified-overage-in-use: true` response header. When this field is set on the rate limit state, registered overage listeners are notified. This enables the UI to react immediately when Fable 5 usage transitions into the credit-based overage regime.\n\n**Evidence**\n\nHeader parsing and listener notification (search for `\"anthropic-ratelimit-unified-overage-in-use\"`)"}