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crestapps-core-external-relays

Skill for implementing and managing persistent external chat relays in CrestApps.Core 2.0 using IExternalChatRelay, IExternalChatRelayManager and its ExternalChatRelayConnectionManager singleton, ExternalChatRelayContext, IExternalChatRelayEventHandler, IExternalChatRelayNotificationHandler, IExternalChatRelayNotificationBuilder and ExternalChatRelayEventTypes. Use it when bridging AI chat sessions or chat interactions to a live-agent or other external chat platform through a deferred response handler.

src/CrestApps.AgentSkills/crestapps-core/crestapps-core-external-relays/SKILL.md

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Oct 21, 2026
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# CrestApps.Core External Chat Relays

## Scope

`IExternalChatRelay` is the contract for a persistent, bidirectional connection to a live-agent or other external chat platform. An implementation supplies connection, prompt, signal, disconnect, and async-disposal behavior; the transport is application-defined.

The core packages ship no `IExternalChatRelay` implementation, only the manager: `ExternalChatRelayConnectionManager` is registered by `AddCoreAIOrchestration()` as the singleton `IExternalChatRelayManager` and tracks relay instances by session ID. Its members are `GetOrCreateAsync(sessionId, context, factory, cancellationToken)`, `Get(sessionId)` and `CloseAsync(sessionId, cancellationToken)`.

## Connect and Close a Relay

Create the relay in the factory passed to the manager. The manager connects it, disposes a failed connection attempt, and disposes an extra instance if a concurrent caller won the same session ID.

```csharp
var relay = await relayManager.GetOrCreateAsync(