[FEATURE] 'Agent mode' analogous to 'Plan mode' but for forcing Claude Code to spawn subagent

Problem

I struggle to make Claude Code spawn subagents without manually requesting it in the prompt. Despite having explicit instructions in my user-level CLAUDE.md file:

## Task Delegation

**IMPORTANT**: Unless the task is very simple, you should use the Task tool to delegate the task to a specialized agent.

It is your duty to identify the most appropriate agents for the task, and whether the agents can work in parallel or sequentially.

Claude routinely ignores these instructions.

Proposed solution

Implement an "Agent Mode" toggle (similar to the existing "Plan Mode") that can be activated via:

• SHIFT+TAB keyboard shortcut, or
• Another accessible shortcut

This mode would use a custom system prompt to force Claude Code to spawn a subagent to handle work, regardless of task complexity.

Alternatives considered

None

Priority

Medium

Category

Performance and speed