This looks great. Building right into the editor looks like a solid way to go. I built "Agent Kanban" (anextension) for VS Code to enforce a similar "plan, tasks, implement" flow as you describe. That flow is really powerful for getting solid Agentic coding results. My tool went the route of encouraging the model via augmenting AGENTS.md and having the Kanban task file be markdown that the user and agent converse in (with some support for git worktrees which helps when running multiple sessions in parallel): https://www.appsoftware.com/blog/introducing-vs-code-agent-k...