IDEs can support "AI coding agents" on their own.
The entire workflow for "AI coding agents" boils down to:
1. You write a prompt
2. The "agent" wraps it in a system prompt and sends it to the LLM
3. The LLM sends back a response
4. The agent performs specific actions based on that response (editing files, creating new ones, etc.)
Microsoft already started doing that with Copilot. And they have a vibrant ecosystem of VS Code extensions (I maintain one of them [1])
"AI agents" should be a feature, not a separate piece of software (IDE) that's integral to software devs.