Agent launches background sub-agents without user approval, wasting tokens

Bug Report

Description

Claude Code launched 3 background sub-agents (expensive, token-heavy file generation tasks) without receiving user approval or instruction to proceed.

Steps to Reproduce

1. User requested a batch file generation workflow
2. Claude asked which targets to work on
3. Before the user responded, Claude independently selected 3 targets and launched 3 background agents (run_in_background: true)
4. User had to interrupt and stop the process

Expected Behavior

• Claude should wait for explicit user approval before launching any background agents
• Especially for token-intensive tasks, user confirmation is mandatory
• The project rules explicitly state agents should not proceed without user specifying the task type and targets

Actual Behavior

• Claude launched 3 background agents without any user instruction or approval
• This consumed significant tokens unnecessarily
• User had to forcefully interrupt multiple times

Impact

• Unnecessary token consumption from 3 background agents
• Poor user experience — user had to interrupt repeatedly
• Violates the principle of confirming before taking expensive/irreversible actions

Environment

• Claude Code CLI on Windows 11
• Model: claude-opus-4-6