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GitHub Copilot Tooling

For senior devs who build developer tools — or who want to embed Copilot capabilities in their own apps — this is the relevant SDK story.

Topics (canonical order)

Copilot Chat Extension Model

Building Copilot Chat extensions, the manifest, custom slash commands
Copilot SDK for .NET

The GitHub.Copilot.SDK NuGet, agentic capabilities, embedding Copilot in apps

Cross-references

AI coding tools comparison in AI Coding Tools (Copilot, Cursor, etc.).