The Agent Window and Composer

1. The Agent Window and Composer

Hey again! In this video, we're diving into one of the most exciting features in Cursor — the Agent Interface and Composer, Cursor's own LLM model.

2. Agent and Editor View

We now have the Editor and Agent Window separated. The Editor View is where we work with our code files — reviewing and editing them alongside the Cursor agent panel. The Agent View, on the other hand, is dedicated purely to interacting with the Cursor agent itself. Let's explore how it all works using our Next.js portfolio app.

3. Agent Window

The agent window interface allows us to open and run multiple AI agents side by side.

4. Agent Window

Each agent can focus on a specific task, for instance, one debugging our code, another planning new features, and a third improving documentation or refactoring code. This means we're no longer limited to a single chat thread.

5. Working with parallel agents

We can now work with parallel agents, each with its own context and workspace. It's like having a team of AI collaborators — each one specialized in a different part of our project.

6. Composer

Now, powering all of this is Composer, Cursor's latest frontier model. Composer is 4x faster than similarly intelligent models and is built for low-latency, agentic coding — meaning it's optimized for quick iteration and complex multi-step workflows. Most responses finish in under 30 seconds, so we can move faster and stay in flow. It also comes equipped with codebase-wide semantic search, making it much better at understanding and navigating large projects. In short, Composer makes our AI agents faster, smarter, and more reliable for real coding tasks.

7. Composer in action

Let's see this in action. Say we're debugging our portfolio app. We open the Agent Window and prompt: "Debug the code of the portfolio app and suggest fixes for errors." Then we select the Composer 1 model from the models dropdown and send this request. As this agent is running,we can open a new agent and ask it to do something else in parallel, like: "How can I fetch my latest articles from medium.com and add them dynamically to my portfolio site's blog section?" To run this request, let's choose the plan mode. At the moment, 2 agents are doing their jobs simultaneously. If we head over to the debugging agent thread, Cursor quickly scans our code, highlights issues, and suggests precise fixes. We can review the changes file by file inside this interface, which is much more convenient than flipping between multiple files. Let's approve these, and our app updates automatically. If we open the second agent thread, we can see how the agent created a clear plan to fetch the posts, parse the articles, and display them on our site. We can then ask for code snippets or implementation tips — all without leaving our workspace. With multiple agents working side by side — powered by Composer — we can debug, plan, refactor, and document our app all at once. This parallel workflow transforms the way we build, helping us move from idea to execution — faster than ever.

8. Let's practice!

Let's practice!

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