What’s changing
We are deprecating GitHub Copilot Extensions (built as GitHub Apps) on November 10, 2025, in favor of Model Context Protocol (MCP) servers. MCP provides a universal standard for AI agent integration—build an MCP server once and use it across any compatible agent or chatbot, not just GitHub Copilot.
Who this affects
This change affects developers who have built or use Copilot Extensions as GitHub Apps.
This does NOT affect:
- Client-side VS Code Copilot Extensions (remain fully supported)
- Standard GitHub Apps (without Copilot Extension functionality)
Why this change matters
GitHub Copilot Extensions only work within GitHub Copilot chat. If developers want their tools to work with other AI assistants, they have to build separate integrations for each one. MCP addresses this by providing an open standard that’s modular and easy to integrate into a variety of AI assistants and agents. Build your server once and it works with GitHub Copilot, Claude Code, and any other MCP-compatible host app. We’re focusing on MCP because developers shouldn’t have to rebuild the same functionality for every platform.
What you should do
- If you have an existing extension: Plan your replacement strategy. Your extension will stop working November 10, 2025 by 11:59 PM PST.
- If you have a hybrid app: Disable the Copilot Extension configuration in your GitHub App settings before November 10 by 11:59 PM PST to keep your app in the Marketplace.
- Start building with MCP today: Visit the GitHub MCP Registry to explore existing servers, or check out Anthropic’s MCP documentation to start building your own.
- No new Copilot Extensions: Creation of new server-side Copilot Extensions is blocked after September 24, 2025 at 8:00 AM PST.
Key dates
- September 24, 2025: New extension creation blocked
- November 3–7, 2025: Brownout testing period (temporary service interruptions)
- November 10, 2025: Full sunset—all Copilot Extensions disabled