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Copilot SDK being used in JavaScript to create an agentic session.

The GitHub Copilot SDK is now available in public preview.

Key facts

Summary

The Copilot SDK exposes the same production-tested agent runtime that powers GitHub Copilot cloud agent and Copilot CLI. -.NET: dotnet add package GitHub. Custom tools and agents: Define domain-specific tools with handlers and let the agent decide when to invoke them. Fine-grained system prompt customization: Customize sections of the Copilot system prompt using replace, append, prepend, or dynamic transform callbacks. Blob attachments: Send images, screenshots, and binary data inline without writing to disk.

Read full article at GitHub Blog →