Microsoft Copilot SDK

Overview

On October 28, 2026 GitHub said the GitHub Copilot SDK is becoming the Microsoft Copilot SDK, the programmable interface for the Microsoft Copilot harness, described as a shared agent foundation across Microsoft and GitHub products. The SDK repository is being updated for a planned move to the Microsoft organization, with branding and documentation revised in phases; package names, namespaces and some docs may still say GitHub Copilot SDK during the transition. GitHub states no immediate changes are required for existing users, support is unchanged per the repository's SUPPORT.md and no new features were announced. A same-day Microsoft post by Tina Schuchman (CVP, Foundry) and Vladimir Fedorov (CTO, GitHub) describes the harness itself: a multi-model orchestration layer built by GitHub engineering that powers Copilot Code, Copilot Studio, the GitHub Copilot app, the CLI and VS Code. It supports 20+ frontier models plus bring-your-own-key with task-based routing, MCP, agent skills and agent plugins, and its runtime was ported to Rust to cut session overhead and time-to-first-token. Developers can run it through the SDK or have Foundry host it as a managed service where Microsoft runs the agent loop and sandbox.

This is a sourced directory entry. Features and capabilities are reported in the linked sources; this entry does not document independent Aymorphic testing.

Key features

• Programmatic access to the Copilot harness for custom agent apps
• Developers keep control of prompts, tools, policies and app experience
• Phased rename and repository move to the Microsoft organization
• No breaking changes announced for existing users
• Harness supports 20+ frontier models and bring-your-own-key with task-based routing
• Foundry offers the harness as a fully managed service (Microsoft runs agent loop and sandbox)
• Runtime ported to Rust to reduce session overhead and time-to-first-token (Microsoft-reported)

Use cases

• Embedding Copilot agent capabilities in internal developer tools
• Building custom agent experiences on a shared Microsoft/GitHub harness

Pricing

unknown; the announcement lists no pricing change.

Pricing reflects the source record and may change. Confirm current terms with the provider.

Dates and sources

Released

Not listed

Record updated

2 Nov 2026

Record last checked

2 Nov 2026

• github.blog/changelog/2026-10-28-github-copilot-sdk-is-becoming-microsoft-copilot-sdk/
• blogs.microsoft.com/blog/2026/10/28/introducing-the-microsoft-copilot-harness-unlocking-the-potential-of-truly-multi-model-agentic-work/