[BUG] Desktop: scheduled tasks can't offer task chips any more

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Since today (15 Oct around 13:00 UTC), my scheduled task can’t offer task proposal cards (aka task chips). This was accompanied by a removal of the spawn_task tool and introduction of the start_session tool. start_session refuses even own_initiative cards in scheduled sessions.

My team has been using a scheduled task to identify & suggest new work, improving our ability to parallellise work.

Info

• Claude Model: Opus 5.5
• Is this a regression? Yes, this worked in a previous version
• Last Working Version: same version, until 15 Oct; probably a server-side change
• Claude Code Version: 2.1.295 (Claude desktop app 2.37337.1)
• Operating System: macOS

What Should Happen?

A scheduled task should be able to offer chips again. A chip only starts when I click it, so I don't think it should need a user to have started the session.

<img width="706" height="257" alt="Image" src="https://github.com/user-attachments/assets/8663d9bd-44fb-4a80-a281-23bd5b358c84" />

Error Messages/Logs

A proposal card cannot carry a host, folder, environment or preset yet: propose it for this project (drop those arguments), or start it there when the user asks you to (initiation "user_asked").

Steps to Reproduce

1. Create a scheduled task in the desktop Code tab that offers a chip with start_session (initiation: "own_initiative").
2. Let it run.
3. The call is refused and no chip appears.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.289

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

Bug is in Claude desktop app