---
title: "A file viewer beside the Muse Code thread"
url: https://helicon.sh/features/file-viewer
description: "Browse the project, read highlighted source, preview and edit Markdown, and view images, video and PDFs. Any path Muse Code mentions opens beside the conversation."
updated: 2026-09-19
site: Helicon
---

# Read what the agent touched

Helicon puts a file viewer next to the thread. You can browse the project tree, read source with syntax highlighting, preview and edit Markdown, and open images, video and PDFs. Paths the agent mentions in the conversation open there directly, so reviewing a change does not mean switching apps.

## What it opens

| Kind | What you get |
| --- | --- |
| Source files | Syntax highlighted, read oriented |
| Markdown | Preview, and editing when you want it |
| Images | Inline preview |
| Video | Inline playback |
| PDF | Inline preview |

## Why it is beside the thread, not instead of it

Reviewing agent work is a two column job: what it said and what it did. Putting the file next to the conversation keeps both in view. Helicon is not trying to be your editor, so the viewer optimises for reading rather than for writing.

> Paths Muse Code mentions are clickable. If the agent says it edited a file, that file is one click away.

## Frequently asked questions

### Can I edit source in the viewer?

Markdown is editable. Source files are read oriented, because Helicon is a client for an agent rather than an editor.

### Does it index my whole disk?

No. It browses the project directories you add, nothing else.

### Does it work in the web build?

Yes. The same UI ships as a web app against a daemon, so the viewer reads files on the daemon's machine.

## Related

- [Inline diffs](https://helicon.sh/features/inline-diffs): Every file the agent edits lands as a diff at the point in the conversation where it happened, with the touched file open in a viewer beside the thread.
- [Remote daemon and web UI](https://helicon.sh/features/remote-daemon): The same Helicon UI ships as a web app pointed at a daemon on another machine, so a laptop can supervise Muse Code running on a workstation or a server.
- [Projects and worktrees](https://helicon.sh/features/projects-and-worktrees): Helicon groups every Muse Code thread under the directory the agent worked in, isolated git worktrees included, so parallel work across repositories has one place to live.

---

Helicon is a free, MIT licensed, unofficial community client for Meta's Muse Code CLI. Not made, sponsored or endorsed by Meta. Source: https://helicon.sh/. Machine readable index: https://helicon.sh/llms.txt