[Question]: how to cancel background agent task

## Question or topic

Say my Main Agent delegated a task to a Sub Agent, the task is a long-run task, how can i cancel that task in the middle?
I've looked the skill: `multi_agent_collaboration`, seems no `cancel` command.

## Context

[Relevant setup: QwenPaw version, channel, skill, or use case. This helps others answer.]

## Tried so far

[Optional: what you already tried or read (docs, issues, etc.).]

---

**Note:** For general questions or ideas, [GitHub Discussions](https://github.com/agentscope-ai/QwenPaw/discussions) may get more visibility. Use this template when the answer might lead to a bug report, feature request, or doc change.