Individual skill

orchardcore-ai-a2a-host

Skill for the CrestApps Orchard Core A2A Host feature (CrestApps.OrchardCore.AI.A2A.Host), which exposes AI profiles of type Agent through the Agent-to-Agent protocol. Covers the public /.well-known/agent-card.json discovery endpoint, A2A 1.0 agent cards that publish their endpoint in supportedInterfaces with the JSON-RPC binding instead of the deprecated url field, multi-agent mode with /a2a?agent={agentName} versus ExposeAgentsAsSkill skill mode with agentName metadata routing, A2AHostOptions configured under OrchardCore:CrestApps:AI:A2AHost (AuthenticationType OpenId, ApiKey or None, ApiKey, RequireAccessPermission), security schemes advertised on the card, the AccessA2AHost permission, AI usage metered under the A2A category, and creating Agent profiles with the AIProfile recipe step. Use this skill when requests mention Orchard Core A2A host, exposing agents to other AI apps, agent cards, supportedInterfaces, ExposeAgentsAsSkill, or troubleshooting A2A clients that cannot reach an Orchard Core agent.

src/CrestApps.AgentSkills/crestapps-orchardcore/orchardcore-ai-a2a-host/SKILL.md

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Last checked: Nov 6, 2026

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Repository stars (not skill ratings): 13
Repository last updated: Oct 21, 2026
License: MIT

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agent-skills Repository topic
ai Repository topic
ai-agents-framework Repository topic
dotnet Repository topic
mcp Repository topic
mcp-server Repository topic
orchardcore Repository topic
security Derived category

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# Orchard Core A2A Host

The A2A Host feature makes every AI profile of type **Agent** discoverable and callable by external A2A clients, including another Orchard Core site running the A2A Client feature (`orchardcore-ai-a2a-client`).

## Guidelines

- Feature ID `CrestApps.OrchardCore.AI.A2A.Host`, in the `CrestApps.OrchardCore.AI.A2A` package (install it in the web/startup project). It depends only on `CrestApps.OrchardCore.AI`.
- Only profiles whose `Type` is `Agent` are exposed. Their `Name` identifies the agent and their `Description` becomes the card and skill description.
- Cards follow A2A 1.0: each card publishes its endpoint in `supportedInterfaces` (protocol binding JSON-RPC). The deprecated top-level `url` is no longer emitted.
- The discovery endpoint is always anonymous so clients can read the authentication requirements. The `/a2a` endpoint is protected by the `A2AHostPolicy` policy.
- Options come from shell configuration only (no admin settings page). Default authentication is `OpenId`.
- Use `None` only for local development.

## Enable the feature