Activate a version
Deprecated on the v2 branch model. Migrate to POST /agent/{id}/branches/{branchId}/live or POST /agent/{id}/branches/{branchId}/revisions/{revisionId}/restore. When ENABLE_BRANCH_MODEL is on, this endpoint returns 409 versioning_v2_migration_required with the Deprecation: true header. See the migration guide.
| Set a published version as the active version for the agent. The previously active version is deactivated. This does not modify the version’s config — it only changes which version serves live traffic. Activation is idempotent: if the version is already active, the endpoint returns that version without changing config.
Authentication
API key from the console ApiKey collection, sent as Bearer token. Also accepts session cookies for browser-based auth.