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POST
Restore an experiment version

Authorizations

X-Auth-Token
string
header
required

Project API key for sending traces and accessing project-scoped resources. Format: sk-lw-... (no underscore). Obtain one by creating a project via the Admin API or the LangWatch UI.

Path Parameters

version
integer
required

The version to restore, as listed by GET /api/experiments/{slug}/versions

Required range: x >= 1
slug
string
required

Response

Version restored

version
number
required

The new version the restore wrote. History is never rewritten, so the restored version is still in the list.

Last modified on August 24, 2026