As we move to use Copilot CLI as the default GitHub Copilot for JetBrains agent harness (learn more in this blog), your existing local sessions will be preserved. However, to continue working on these local sessions, you will need to migrate them to Copilot CLI sessions.

Start by opening a local session and type /migrate into Copilot Chat, use /migrate:workspace to continue the session in Copilot CLI's workspace mode, use /migrate:worktree to continue the session in Copilot CLI's worktree mode. Both command should be followed by your prompt.

Copilot will summarize the local session's chat history and start a new Copilot CLI session with the summary attached.

Go back to the session list and you will see a new Copilot CLI session running.

Click into the Copilot CLI session and you can see Copilot working on your request. You can view the session history summary by clicking on the local-session-history.md file.