feat: Manual Execution Mode for Sub-Tasks

[Meng Zhang]

Please describe the feature you want

Currently, sub-tasks created with the newTask tool are executed in a fully automated mode. This is efficient for many scenarios, but it can be problematic when the sub-task requires user supervision or intervention. For example, if a sub-task is making significant changes to the codebase, the user might want to review the changes at each step before proceeding.

This feature request proposes a new permission or option that allows sub-tasks to be executed in a "manual" or "step-by-step" mode. In this mode, instead of running to completion automatically, navigate to sub task and exeute it as a normal "top-level" task.

Additional context

This feature would provide a much-needed level of control and oversight for complex or sensitive sub-tasks, making the newTask tool more versatile and robust. It would also improve the user experience by allowing for more interactive and supervised workflows.

Technical Implementation Details

From a preliminary search of the codebase, the relevant files for this feature seem to be:

• packages/vscode-webui/src/components/tool-invocation/tools/new-task/use-live-sub-task.tsx: This hook appears to manage the lifecycle of sub-tasks, including the automatic execution flow.
• packages/livekit/src/chat/middlewares/new-task-middleware.ts: This middleware is likely responsible for intercepting the newTask tool call and initiating the sub-task.
• packages/tools/src/new-task.ts: The definition of the newTask tool itself.

A potential implementation could involve:

1. Adding a new permission toggle newTask

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