[FEATURE] Let Agents invoke other Agents

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

basically, title

Proposed Solution

like a recursive function

Alternative Solutions

i can't simulate it

Priority

Critical - Blocking my work

Feature Category

API and model interactions

Use Case Example

_No response_

Additional Context

_No response_