----------------------------- **While I generate an answer, here are some sources that might be helpful**: * [Update Assistant]() * [Create Assistant]() * [List Assistants]() * [Get Assistant]() -----------------------------

### Answer When dealing with issues where the server URL sometimes fails to fetch an assistant without any changes to the codebase, it's important to ensure that the assistant configuration, including transcriber and voice settings, is correctly defined and that the server URL endpoint is reliably accessible and capable of handling requests within reasonable time frames. The Vapi documentation provides insights into configuring assistants, including specifying transcribers, voice options, and other settings through the API. For example, when creating an assistant, you can define the transcriber, model, voice, and other settings such as forwarding phone numbers, recording options, and custom messages [(1)]() . Likewise, when updating an assistant, similar settings can be adjusted [(2)]() . Regarding the server URL functionality, it's designed to receive and respond to various types of messages during conversations, such as function calls, assistant requests, status updates, and more [(3)]() [(4)]() . While the documentation does not explicitly provide a maximum size for the assistant output or specific response time expectations, ensuring that your server can handle requests efficiently and return responses quickly is crucial for maintaining a seamless interaction. Slow responses or large payloads could potentially lead to timeouts or errors. If you're experiencing intermittent issues with fetching an assistant, it could be related to network instability, server performance, or configuration errors in the assistant or server URL settings. Double-checking the assistant's configuration for any potential issues and ensuring your server's readiness to handle requests promptly

might help mitigate these problems. For specific errors like "pipeline-error-first-message-failed", ensuring the correct configuration of the transcriber and voice settings is essential. This type of error might indicate issues with the initial setup or compatibility of selected voice options [(5)]() . If the problem persists without a clear resolution in the documentation, it might be a specific issue worth investigating further with regards to server setup, configuration, and network conditions.

Got it. Tagging @User for additional help.