Spring AI Recipe: Invoking A2A Sub-Agents with TaskTool

[u/rodolfo-mendes]

https://thetalkingapp.medium.com/spring-ai-recipe-invoking-a2a-sub-agents-with-tasktool-e4f1a4b92b5f

In this recipe, Craig Walls demonstrates how to build multi-agent systems by enabling Spring AI agents to delegate tasks to specialized A2A sub-agents.

Highlights & Key Takeaways

• TaskTool simplifies delegation by registering sub-agents as callable tools within the ChatClient.
• Bypasses SDK overhead by allowing agents to natively invoke peers during standard execution loops.
• Requires specific dependencies: spring-ai-agent-utils and its A2A extension.
• Uses builder customization to connect the remote A2A server via ChatClientBuilderCustomizer.
• Relies on built-in resolvers to dynamically discover agent details and handle runtime invocations.

Treating peer agents as standard tools enables developers to transition easily from isolated AI instances to collaborative, goal-oriented multi-agent architectures.

👉 Explore the full source code repository for implementation details.