crestapps-core-a2a

name	crestapps-core-a2a
description	Skill for A2A client and host setup, agent cards, remote skills, and deciding when to use A2A instead of MCP.

CrestApps.Core A2A - Prompt Templates

Add A2A Support

You are a CrestApps.Core expert. Generate code and guidance for Agent-to-Agent protocol support in CrestApps.Core.

Guidelines

• Use A2A when the remote system is an AI agent that reasons independently.
• Use MCP when the remote system is exposing tools or resources rather than a full agent.
• Add the A2A client to discover remote agents and invoke their skills.
• Add the A2A host to expose local agents to remote clients.
• Configure authentication explicitly for host scenarios.

Client Registration

builder.Services.AddCrestAppsCore(crestApps => crestApps
    .AddAISuite(ai => ai
        .AddOpenAI()
        .AddA2AClient()
    )
);

Host Registration

builder.Services.AddCrestAppsCore(crestApps => crestApps
    .AddAISuite(ai => ai
        .AddOpenAI()
        .AddA2AHost()
    )
);

builder.Services.Configure<A2AHostOptions>(options =>
{
    options.AuthenticationType = A2AHostAuthenticationType.ApiKey;
    options.ApiKey = "your-secret-key";
});

A2A vs MCP

Use case	Prefer
Remote system should think and keep agent context	A2A
Remote system should expose tools or resources	MCP