Struct A2AClientFactory 

pub struct A2AClientFactory { /* private fields */ }

Factory for creating A2AClient instances with automatic protocol negotiation.

Maintains a registry of TransportFactory implementations indexed by protocol and major version. When creating a client from an AgentCard, it selects the best matching transport based on the agent’s declared interfaces and the client’s preferred bindings.

Implementations

impl A2AClientFactory

pub fn builder() -> A2AClientFactoryBuilder

Create a builder for configuring the factory.

pub async fn create_from_card( &self, card: &AgentCard, ) -> Result<A2AClient<Box<dyn Transport>>, A2AError>

Create a client by negotiating the best transport with the agent card.

Selection algorithm (mirrors Go SDK):

1. For each interface in the agent card’s supported_interfaces
2. Look up matching factory by (protocol, major_version)
3. Rank candidates: client preference order, then newest version
4. Try connecting in rank order; first success wins