Anthropic Retires Legacy Workbench on August 17 Alongside Three Experimental Prompt APIs

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Anthropic ended access to the legacy Claude Console Workbench for all users on August 17 and retired three experimental APIs for generating, improving, and templatizing prompts at the same time. Saved prompts, versions, completions, and evaluations in the legacy interface are no longer accessible, and the refreshed Workbench cannot import that data. Developers still relying on the old interface or endpoints should confirm their exports and remove the affected API calls.

Legacy Data Does Not Move into the Refreshed Workbench

Anthropic announced the retirement on July 17 and updated its help documentation again this week to restate the deadline. Saved prompts, revisions, completions, and evaluations in the legacy Workbench remained available only through August 17. The refreshed Workbench does not save prompt history or conversations and provides no import path. Teams that used the legacy product could retain a copy only through its export option or Organizational Settings before access ended.

Three Experimental Endpoints Now Return Errors

The endpoints retired with the legacy Workbench are `/v1/experimental/generate_prompt`, `/v1/experimental/improve_prompt`, and `/v1/experimental/templatize_prompt`. Anthropic's release notes state that requests will return an error after removal. Teams that wired these tools into an internal prompt platform, script, or CI workflow should inspect their call logs and configuration rather than checking only whether the web interface still opens.

The Refreshed Workbench Is Closer to an API Debugging Surface

Developers can still use the refreshed Workbench to try Claude models and Messages API features, inspect complete requests and responses, and export Python or TypeScript code. What changed is its role: it no longer acts as a prompt asset library or evaluation repository. This is not a shutdown of the Claude API as a whole, but it does move prompt versioning and evaluation records back into source control or a team's own tooling.

via: Claude Platform release notes, Anthropic Help Center: How do I use the Workbench?