Extend GitHub Copilot with the Copilot SDK | LIVE151
Microsoft shipped the Copilot SDK 1.0 stable (GA), letting developers run its agent harness in production.
“Just yesterday 1.0 stable.”
At Build 2026, Microsoft announced the Copilot SDK reached 1.0 stable general availability after internal development since January, enabling customers to put its shared agent harness into production. The same SDK already powers internal Microsoft products like Office Excel and co-work, signaling Microsoft's push to standardize agentic development on a single harness across its ecosystem.