Copilot BYOK agent sessions

GitHub's Copilot app can route agent sessions through user-provided model providers and OpenAI-compatible endpoints, with keys stored locally in the operating-system keychain. Why it matters: Bring-your-own-key support makes model routing, cost control, and data-boundary choices part of everyday coding-agent setup instead of a separate platform decision.

Try this: Before adopting BYOK routing, define which providers are allowed for low-risk edits, which tasks require a stronger model, and how local keys will be managed and rotated.