Fixing the ‘No utility model is configured’ Error for Copilot BYOK in VS Code

When working with Bring Your Own Key (BYOK) models in Visual Studio Code’s GitHub Copilot chat, you might encounter a configuration error preventing the agent from completing your requests. This error typically presents itself as:

No utility model is configured for ‘copilot-utility-small’ while the selected main agent model is BYOK.

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How to Use Azure Foundry Models with BYOK in VS Code

If you’re looking to leverage your own custom AI models within Visual Studio Code, using Azure AI Foundry models as your Bring Your Own Key (BYOK) provider is an excellent approach. Previously limited to the Insiders build, custom BYOK models are now officially supported in the stable release of VS Code. This allows you to integrate powerful, customized models directly into your development workflow via GitHub Copilot.

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