Based on the provided knowledge sources, there is no direct information about adding custom response headers from a Kratos webhook. The documents mainly discuss how to configure webhooks for various purposes, but they don't specifically mention the ability to add custom response headers from a webhook. However, the knowledge sources do provide some relevant information about webhook responses and how they are handled: 1. [Webhook response handling](https://www.ory.sh/docs/guides/integrate-with-ory-cloud-through-webhooks#modify-identities) explains that webhooks can return JSON responses to modify identities, traits, or metadata. 2. [Responding to the webhook](https://www.ory.sh/docs/hydra/guides/claims-at-refresh#responding-to-the-webhook) in Hydra (another Ory product) shows how to return JSON responses to modify claims. These sources suggest that webhooks are primarily designed to return data in the response body rather than adding custom headers. To give a definitive answer about adding custom response headers from a Kratos webhook, we would need more specific documentation or information. If this functionality is crucial for your use case, I recommend reaching out to Ory's support channels or consulting their more detailed documentation for confirmation.