A2A Communication

1. 1
   Define Message Structure

   Create a data structure for A2A messages. Include fields for sender ID, receiver ID, message type, payload (as a JSON string), and contract ID.
2. 2
   Implement Message Sending

   Implement a function to send A2A messages. This function should serialize the message to JSON and transmit it over a communication channel (e.g., HTTP, message queue).
3. 3
   Implement Message Receiving

   Implement a function to receive A2A messages. This function should listen on a communication channel, deserialize the JSON message, and process it based on the message type and contract ID.
4. 4
   Define Contract Negotiation

   Implement a simple contract negotiation protocol. Agents exchange 'propose', 'accept', and 'reject' messages to agree on a contract (e.g., task parameters, data format).
5. 5
   Implement Capability Discovery

   Implement a mechanism for agents to advertise and discover their capabilities. This could involve a central registry or a broadcast-based discovery protocol.

Begin by defining the structure of A2A messages. Consider using a class to encapsulate the message fields.  Then, implement basic message sending and receiving functions using a simple communication channel like HTTP.

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