# Features

These guides cover the capabilities you can add to your Copilot SDK application. Each guide includes examples in supported languages (TypeScript, Python, Go, .NET, Java, and Rust) where available.

> **New to the SDK?** Start with the [Getting Started tutorial](../getting-started.md) first, then come back here to add more capabilities.

## Guides

| Feature | Description |
|---|---|
| [The Agent Loop](./agent-loop.md) | How the CLI processes a prompt—the tool-use loop, turns, and completion signals |
| [Hooks](./hooks.md) | Intercept and customize session behavior—control tool execution, transform results, handle errors |
| [Custom Agents](./custom-agents.md) | Define specialized sub-agents with scoped tools and instructions |
| [Fleet Mode](./fleet-mode.md) | Dispatch multiple sub-agents in parallel for large, independent workstreams |
| [MCP Servers](./mcp.md) | Integrate Model Context Protocol servers for external tool access |
| [Skills](./skills.md) | Load reusable prompt modules from directories |
| [Plugin Directories](./plugin-directories.md) | Bundle skills, hooks, MCP servers, and agents as a single loadable plugin |
| [Session limits](./session-limits.md) | Set an AI Credits budget for a session and observe budget events |
| [Image Input](./image-input.md) | Send images to sessions as attachments |
| [Streaming Events](./streaming-events.md) | Subscribe to real-time session events (40+ event types) |
| [Steering & Queueing](./steering-and-queueing.md) | Control message delivery—immediate steering vs. sequential queueing |
| [Session Persistence](./session-persistence.md) | Resume sessions across restarts, manage session storage |
| [Remote Sessions](./remote-sessions.md) | Share locally hosted sessions to GitHub web and mobile via Mission Control |
| [Cloud Sessions](./cloud-sessions.md) | Run sessions on GitHub-hosted compute through Mission Control |

## Related

* [Hooks Reference](../hooks/README.md): detailed API reference for each hook type
* [Integrations](../integrations/microsoft-agent-framework.md): use the SDK with other platforms (MAF, etc.)
* [Troubleshooting](../troubleshooting/debugging.md): when things don't work as expected
* [Compatibility](../troubleshooting/compatibility.md): SDK vs CLI feature matrix