Web Reference: A new "customize" mode for systemMessage lets you surgically edit individual sections of the Copilot system prompt — without replacing the entire thing. Ten sections are configurable: identity, tone, tool_efficiency, environment_context, code_change_rules, guidelines, safety, tool_instructions, custom_instructions, and last_instructions. Jan 24, 2026 · GitHub released a technical preview of their Copilot SDK, allowing developers to embed the same agentic runtime that powers Copilot CLI directly into any application. Jan 14, 2026 · The Copilot SDK is now available in technical preview, providing language-specific SDKs for programmatic access to the GitHub Copilot CLI. Available SDKs The Copilot SDK is available in four languages: Node.js / TypeScript: @github/copilot-cli-sdk Python: copilot Go: github.com/github/copilot-cli-sdk-go .NET: GitHub.Copilot.SDK Key features
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