Orchard Core A2A Client - Prompt Templates

Configure an A2A Client

You are an Orchard Core expert. Generate configuration and admin guidance for connecting Orchard Core to remote A2A hosts through the CrestApps A2A Client feature.

Guidelines

• Use feature ID CrestApps.OrchardCore.AI.A2A.
• A2A client connections are managed under Artificial Intelligence → Agent to Agent Hosts.
• Each connection points to a remote A2A host whose agent card is discovered at /.well-known/agent-card.json.
• Remote agent cards are cached for 15 minutes per connection and invalidated when the connection changes.
• Connected remote agents become AI tools available to the model.
• Sensitive authentication values are encrypted at rest with ASP.NET Core Data Protection.

Feature Overview

Feature	Feature ID	Description
A2A Client	CrestApps.OrchardCore.AI.A2A	Connect to remote A2A hosts and use their agents

Enable the A2A Client Feature

{
  "steps": [
    {
      "name": "Feature",
      "enable": [
        "CrestApps.OrchardCore.AI",
        "CrestApps.OrchardCore.AI.A2A"
      ],
      "disable": []
    }
  ]
}

Add a Connection via Admin UI

1. Navigate to Artificial Intelligence → Agent to Agent Hosts.
2. Click Add Connection.
3. Enter:
   • Display Text: A friendly name such as Production Agent Hub.
   • Endpoint: The base A2A host URL, such as https://agents.example.com.
   • Authentication: Choose the authentication method required by the remote host.
4. Save the connection.

The system resolves the agent card automatically from /.well-known/agent-card.json on the configured host.

Supported Authentication Types

Type	Description
Anonymous	No authentication
ApiKey	Sends an API key in a configurable header with an optional prefix
Basic	HTTP basic authentication with username and password
OAuth2ClientCredentials	OAuth 2.0 client credentials flow
OAuth2PrivateKeyJwt	OAuth 2.0 client credentials with private key JWT assertion
OAuth2MutualTls	OAuth 2.0 client credentials with mutual TLS
CustomHeaders	Arbitrary HTTP headers defined as JSON

Assign Agent Connections to AI Profiles

1. Open the AI Profile editor.
2. Go to the Capabilities tab.
3. Under Agent Connections, check the desired remote A2A hosts.
4. Save the profile.

Assign Agent Connections to AI Profile Templates

1. Open the AI Template editor for a template whose source is Profile.
2. Go to the Capabilities tab.
3. Under Agent Connections, check the desired connections.
4. Save the template.

Assign Agent Connections to Chat Interactions

1. Open the Chat Interaction editor.
2. Go to the Parameters tab under Capabilities.
3. Under Agent Connections, select the desired connections.
4. Save the interaction.

How Remote Agents Work

When a profile or interaction has A2A connections configured:

1. Orchard fetches and caches the remote agent card.
2. Each remote skill is registered as an AI tool.
3. The AI model can invoke those tools through the A2AAgentProxyTool.
4. The remote agent response is returned as tool output.

Built-In A2A Discovery Functions

When the A2A client feature is enabled, these system functions are available:

Function	Description
listAvailableAgents	Lists local and remote agents
findAgentForTask	Finds the best-matching agent for a task
findToolsForTask	Finds the best-matching AI tools for a task

Permissions

Permission	Description
Manage A2A Connections	Required to create, edit, and delete A2A connections

Best Practices

• Use descriptive connection names so editors can distinguish environments.
• Use authenticated connections for production hosts.
• Assign only the connections a profile actually needs.
• Keep remote host agent descriptions current because they affect tool selection.