Files
Benjamin Taylor e1f88ebc12 refactor(examples): split the Channel out of the host, drop its HTTP server
Addresses review feedback that channel-host.mts is doing too much.

Two changes, both scoped to the starters:

1. Channel construction moves to a new `channels.mts` beside `agent.ts` —
   name resolution, `createChannel`, and the `onMessage` handler. That is
   also the file to edit to customise a Channel (commands, reactions,
   onMention), which previously meant editing the host.

   The per-framework agent import moves with it, so `channel-host.mts` is now
   byte-identical in all 15 starters rather than 13 + 2.

2. The host no longer stands up an HTTP server. Its comment claimed the
   server was what "keeps the lifecycle-owning process alive"; that is false.
   An open undici WebSocket holds the event loop on its own — verified with a
   standalone repro where a process with no HTTP server and no timers of its
   own stayed up indefinitely on a single WebSocket connection. The server was
   therefore serving a second, uncalled copy of the runtime API on port 8300
   for no reason.

   With the server gone, `createCopilotNodeListener` was the wrong factory —
   it builds a request listener purely for its activation side effect. The
   host now uses `createCopilotRuntimeHandler` + `ready()`, which is the
   documented long-running-host pattern (see fetch-handler.ts). This also
   drops `node:http`, `basePath`, and the CHANNEL_PORT env var.

Behaviour is unchanged: same Channel, same agent, same status reporting, and
the same non-zero exit on activation failure.

Verified: 14/14 starters with a `typecheck:channel` script pass; mastra has no
such script by design (166dc94691) and its pre-existing Mastra `Memory` type
error is byte-identical before and after. `npm run channel` exercised on both
failure paths — missing channels.json, and missing INTELLIGENCE_API_KEY with a
name supplied — confirming the new `./channels.mjs` specifier resolves under
tsx as well as tsc. `parity:check` output identical to the pre-change baseline.

Refs #6315

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-02 12:41:46 -05:00

8.9 KiB

CopilotKit <> Microsoft Agent Framework Starter

This is a starter template for building AI agents using Microsoft Agent Framework and CopilotKit. It provides a modern Next.js application with an integrated proverbs management agent that demonstrates AG-UI protocol features including shared state, generative UI, and human-in-the-loop workflows.

Prerequisites

  • GitHub Personal Access Token (for GitHub Models API)

  • .NET 9.0 SDK

    • Download directly

    • macOS/Linux

      • Install via Homebrew (brew install dotnet@9) or

      • Install via curl install script
        curl -sSL https://dot.net/v1/dotnet-install.sh | bash /dev/stdin --channel 9.0
        export PATH="$HOME/.dotnet:$PATH"
        
    • Windows

  • Node.js 20+

    • Download directly

    • macOS/Linux

      • Install via Homebrew (brew install node@24) or

      • Install via curl install script
        # Download and install nvm:
        curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.3/install.sh | bash
        
        # in lieu of restarting the shell
        \. "$HOME/.nvm/nvm.sh"
        
        # Download and install Node.js:
        nvm install 24
        
    • Windows

  • Any of the following package managers:

Getting Started

  1. Install dependencies using your preferred package manager:

    # Using npm (default)
    npm install
    
    # Using pnpm
    pnpm install
    
    # Using yarn
    yarn install
    
    # Using bun
    bun install
    

    Note: This will automatically setup the C# agent as well (restore NuGet packages).

    If you have manual issues, you can run:

    npm run install:agent
    
  2. Set up your GitHub token for GitHub Models:

    First, get your GitHub token:

    gh auth token
    

    Then, navigate to the agent directory and set it as a user secret:

    cd agent
    dotnet user-secrets set GitHubToken "<your-token>"
    cd ..
    

    Or set it in one command:

    cd agent; dotnet user-secrets set GitHubToken "$(gh auth token)"; cd ..
    
  3. Start the development server:

    # Using npm (default)
    npm run dev
    
    # Using pnpm
    pnpm dev
    
    # Using yarn
    yarn dev
    
    # Using bun
    bun run dev
    

    This will start both the Next.js UI (port 3000) and C# agent server (port 8000) concurrently.

Running a Channel

channel-host.mts mounts the same agent as an Intelligence Channel (Slack, Teams). It requires INTELLIGENCE_API_KEY and a declared Channel in .copilotkit/channels.json — set both up with copilotkit init or copilotkit channels add, which write that file and the credentials your .env needs, then:

npm run channel

The host reads which Channel to hold from .copilotkit/channels.json. If a project declares more than one, set INTELLIGENCE_CHANNEL_NAME to pick one.

The host holds no provider credentials and exposes no provider endpoint — Intelligence owns the provider edge — so the same file works for every provider.

The Channel itself is declared in channels.mts — that is where to add commands, reactions, or an onMention handler. channel-host.mts only owns the process lifetime, and is byte-identical in every starter.

Once startup finishes, the log reports the truth per Channel:

  • Channel "<name>" is online. — the session is up and can send.
  • Channel "<name>" is declared but no provider is attached yet. — a normal waiting state, not a failure. Run copilotkit channels status to see what setup remains.

Neither message proves the provider app is installed, reachable, or that anyone can message it — verify that separately (invite the bot, then message it) before treating the Channel as working.

Available Scripts

The following scripts can also be run using your preferred package manager:

  • dev - Starts both UI and agent servers in development mode
  • dev:debug - Starts development servers with debug logging enabled
  • dev:ui - Starts only the Next.js UI server
  • dev:agent - Starts only the C# agent server
  • build - Builds the Next.js application for production
  • start - Starts the production server
  • lint - Runs ESLint for code linting
  • install:agent - Restores NuGet packages for the C# agent
  • channel - Holds an Intelligence Channel open (see "Running a Channel" above)
  • typecheck:channel - Type-checks the channel host on its own tsconfig.channel.json

Project Structure

├── agent/                  # C# Agent (Microsoft Agent Framework)
│   ├── Program.cs         # Main agent implementation with tools
│   ├── ProverbsAgent.csproj  # .NET project file
│   └── Properties/        # Configuration (launch settings)
├── src/
│   ├── app/
│   │   ├── page.tsx      # Main UI with CopilotKit sidebar
│   │   ├── layout.tsx    # CopilotKit provider setup
│   │   └── api/
│   │       └── copilotkit/
│   │           └── route.ts  # AG-UI integration endpoint
│   ├── components/       # UI components (weather, proverbs, moon)
│   └── lib/             # Types and utilities
└── scripts/             # Helper scripts for agent setup/run

Features Demonstrated

This starter showcases key AG-UI protocol features:

  • 🔄 Shared State: Proverbs list synchronized between frontend and agent
  • 🎨 Generative UI: Weather card rendered from backend tool
  • 👤 Human-in-the-Loop: Moon card with approval workflow
  • 🛠️ Frontend Actions: Theme color changes from agent
  • 💬 Agentic Chat: Natural language interface with tool calling

📚 Documentation

Contributing

Feel free to submit issues and enhancement requests! This starter is designed to be easily extensible.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Troubleshooting

Agent Connection Issues

If you see "I'm having trouble connecting to my tools", make sure:

  1. The C# agent is running on port 8000
  2. Your GitHub token is set correctly via user secrets
  3. Both servers started successfully (check terminal output)

.NET SDK Not Installed

If you don't have .NET 9.0 installed:

macOS/Linux (Homebrew):

brew install dotnet@9
dotnet --version

macOS/Linux (Install Script):

curl -sSL https://dot.net/v1/dotnet-install.sh | bash /dev/stdin --channel 9.0
export PATH="$HOME/.dotnet:$PATH"

Windows (WinGet):

winget install --id=Microsoft.DotNet.SDK.9 -e

Windows/macOS (Direct Download):

.NET SDK Issues

If you encounter .NET-related errors:

# Verify .NET SDK is installed
dotnet --version  # Should be 9.0.x or higher

# Restore packages manually
cd agent
dotnet restore
dotnet run

GitHub Token Issues

If the agent fails to start with "GitHubToken not found":

cd agent
dotnet user-secrets set GitHubToken "$(gh auth token)"

Or manually:

# Get your token
gh auth token

# Set it as a user secret
cd agent
dotnet user-secrets set GitHubToken "YOUR_TOKEN_HERE"

Port Conflicts

If port 8000 is already in use, you can change it in:

  • agent/Properties/launchSettings.json - Update applicationUrl
  • src/app/api/copilotkit/route.ts - Update the HttpAgent URL