Claim: Requires Data Hub (Operations Hub) Pro/Enterprise; executes JavaScript or Python (beta). VERIFIED.
Sources: - https://developers.hubspot.com/docs/reference/api/automation/custom-code-actions (primary) - https://developers.hubspot.com/docs/api-reference/automation-actions-v4-v4/custom-code-actions - https://www.brightdigital.com/en/blog/hubspot-operations-hub-is-now-data-hub-what-can-you-do-with-it (Operations Hub renamed Data Hub at INBOUND 2025) - https://developers.hubspot.com/changelog/may-2026-rollup (Breeze Assistant in Workflows, May 2026)