Add Discord support via a custom ChannelAdapter reusing the shared WeatherAgent

[vinchencc]

What

Adds Discord as a channel for the weather + WorkIQ agent using a custom DiscordAdapter : ChannelAdapter. Discord reuses the same WeatherAgent as Slack and Teams — there is no separate agent.

Why

Azure Bot Service has no built-in Discord channel, so the adapter is hosted in-process:

• DiscordAdapter : ChannelAdapter — INBOUND builds a TurnContext and runs the SDK pipeline; OUTBOUND renders each reply as a Discord embed.
• DiscordGatewayService : BackgroundService — connects the Discord.Net gateway, translates each incoming message into an Activity, and drives the adapter. Only starts when Discord:BotToken is configured.

This replaces the earlier standalone Discord agent (v1), which bypassed the SDK and duplicated the agent. That approach is removed and its PR is closed.

Auth

Discord isn't an Azure Bot channel, so the custom DiscordAdapter provides its own
IUserTokenClient (via IChannelServiceClientFactory) and overrides ProcessProactiveAsync
to re-run the banked activity after sign-in completes. The OAuth card renders as a
Discord embed with a real sign-in link. WorkIQ MCP tools still use the dev bearer
token for now (wiring them to the user's OBO token is a follow-up).

Testing

Validated end to end in Discord:

• What's the weather in Seattle, WA? / New York, NY → embed card with current conditions + 5-day forecast
• What Teams am I a member of? → real Teams data via WorkIQ MCP
• ForceLogout → ask a question → sign-in card → sign in → magic code → real Teams data
  Build: 2 warnings (pre-existing, in WeatherAgent), 0 errors.

Performance

• Warm up the WorkIQ MCP tools on Discord startup: once the gateway is ready, the host sends a synthetic "warmup" Event activity that pre-loads the tools into the per-token cache before any user message, so the first real Discord message avoids the ~5s tool load. (Slack cannot be pre-warmed this way because its WorkIQ token is a per-user OBO token only available after sign-in.)

[Copilot]

Pull request overview

Adds Discord as an additional “channel” for the Agent Framework Weather + WorkIQ sample by hosting a Discord gateway in-process and translating Discord messages into SDK Activity turns that run the existing WeatherAgent (no separate agent).

Changes:

• Registers a custom DiscordAdapter : ChannelAdapter plus DiscordGatewayService : BackgroundService to connect to Discord.Net and drive agent turns.
• Updates WeatherAgent to treat Discord like Slack (non-streaming) to avoid emitting partial messages, and disables OBO auth for Discord.
• Adds the Discord.Net.WebSocket dependency and configures an AutoSignInSelector to skip OAuth auto sign-in for Discord.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
samples/dotnet/Agent Framework/Program.cs	Wires up Discord adapter/background service and configures AutoSignIn behavior for Discord.
samples/dotnet/Agent Framework/AgentFrameworkWeather.csproj	Adds Discord.Net.WebSocket package reference for gateway connectivity.
samples/dotnet/Agent Framework/Agent/WeatherAgent.cs	Adds Discord-specific behavior (no streaming; force dev bearer-token path by disabling OBO handler).
samples/dotnet/Agent Framework/Adapters/DiscordGatewayService.cs	Implements Discord gateway listener that converts Discord messages into SDK Activity turns.
samples/dotnet/Agent Framework/Adapters/DiscordAdapter.cs	Implements custom ChannelAdapter that renders outbound replies as Discord embeds.

Comments suppressed due to low confidence (1)

samples/dotnet/Agent Framework/Adapters/DiscordGatewayService.cs:118

• Discord turns are executed with CancellationToken.None, so in-flight agent work (tool calls / model streaming) can continue during shutdown and delay process exit. Prefer threading the stoppingToken from ExecuteAsync into OnDiscordMessageAsync and down into ProcessActivityAsync.

                    var agent = scope.ServiceProvider.GetRequiredService<AgentFrameworkWeather.Agent.WeatherAgent>();
                    await adapter.ProcessActivityAsync(identity, activity, agent.OnTurnAsync, CancellationToken.None)
                        .ConfigureAwait(false);

---

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