I created an example of A2A Server with HITL feature.

[Areo-Joe]

I am exploring ways to build Agent Applications, especially paying attention to Human-In-The-Loop.

I built this project to find out how HITL can be implemented with A2A Protocol. Generally it is done by sending HITL related info within DataPart.

There are very few examples of A2A servers in the community, which makes it difficult to find examples of A2A servers with HITL features. In particular, the A2A protocol intentionally does not specify information related to tool calling, making it a black box.

Therefore, I don't know if my implementation fully aligns with the original design intent of the protocol. If my implementation is correct, the next step should be to abstract this paradigm into an Extension.

Any feedback is welcome.

https://github.com/Areo-Joe/a2a-it