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Ethan
1203f625b7
When the chat `start_workspace` tool triggers an active-version upgrade that introduces new required parameters, the build fails with a parameter validation error. Previously this returned a message telling the user to update from the UI — a dead end for the model. This PR lets the model recover inside the chat by: 1. Accepting an optional `parameters` map on `start_workspace` (same schema as `create_workspace`), forwarded as `RichParameterValues`. 2. Returning structured JSON error responses that preserve validation details and the workspace's `template_id`, so the model can call `read_template` to discover what changed. 3. Replacing the UI-only guidance in `exp_chats.go` with model-actionable retry instructions. The expected model flow on an active-version parameter failure is now: ``` start_workspace → fails (structured error with template_id + validations) read_template → discovers new required parameters start_workspace → retries with parameters map → workspace starts ``` <img width="846" height="511" alt="image" src="https://github.com/user-attachments/assets/d18b6864-5970-4225-8da0-0f2ab134ccb4" />