We need a supported server-to-server Partner API endpoint, authenticated with X-ACCESS-TOKEN, to set an AI Agent as the account Default Agent after installing a Template Store template. Suggested endpoint shape: POST /agents/{agent_id}/set-default?account_id={account_id} (or any equivalent Partner API endpoint) Current problem: Template Store install can create/copy the agent successfully and return the new agent_id. However, the copied agent is not used by the account until someone manually opens the Chatrace UI and clicks: AI Center > agent menu > Set as Default Agent. The internal browser call exists: POST /php/user.php param={"op":"ai","op1":"agents","op2":"set-default","data":{"id":"AGENT_ID"},"pageName":"ai","page_id":"ACCOUNT_ID"} But that internal call requires logged-in browser session cookies and does not work with the Partner API X-ACCESS-TOKEN. Why this matters: This blocks fully automated whitelabel onboarding. A whitelabel server can create the account, connect the AI provider, install the template, and update the copied agent prompt, but cannot make that copied agent the active/default one without manual UI work. Real production impact: In our whitelabel account, this caused a real business account to keep answering from an old fallback flow instead of the configured AI agent, even though the agent existed and had the correct prompt. Related note: Template-installed agents can also carry a model that is not in the target account allowedModels list, which causes silent no-reply behavior. But this request is specifically for the missing server-to-server default-agent endpoint.