Agents-as-Tools

What Problem It Solves

You want specialized agents, but you don’t want to “lose the main thread”.
Agents-as-Tools keeps a single primary controller and calls sub-agents like tools.

Core Flow

flowchart TD
  P["Primary agent"] -->|call| A1["Expert agent (tool)"]
  P -->|call| A2["Expert agent (tool)"]
  A1 --> P
  A2 --> P
  P --> O["Final"]

Evolution Path

• Built on: Tool calling discipline (names/args/observations)
• Often combined with: policy/guardrails for sub-agent access control

Repo Reference

• Code: src/agent_patterns_lab/patterns/agents_as_tools.py
• Example: examples/61_agents_as_tools.py
• Tests: tests/test_agents_as_tools.py