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Preview Windows x64 only (preview)

Desktop agent harness

A desktop Agent Harness built for the DeepSeek V4 ecosystem — long-horizon coding, office workflows, and workspace-aware agent tasks.

Download for Windows Install guide
  • Local-first · no telemetry
  • Windows 10 / 11 (x64)
  • DeepSeek V4 · OpenAI-compatible

Not affiliated with DeepSeek Inc. You need your own DeepSeek (or compatible) API key.

Zagens desktop app preview

Built for real work

One window for the whole job

Chat, code, and documents share a single workspace — no context switching between half a dozen tools.

Local sidecar

Chat, tools, and sessions run through an embedded HTTP sidecar on your machine — not a hosted sandbox.

Code & Office modes

Switch task types with different tool surfaces: engineering workspaces with terminal and diff, or document-centric office flows.

Long-horizon tasks

Experimental

Checklists, completion gates, and replay help multi-step refactors stay on track without losing context.

Workspace-native

File tree, previews, diff panel, session replay, MCP, skills, and system-tray notifications in one window.

Get started

Running in three steps

  1. 1

    Download & unblock

    Grab the zip, right-click → Unblock, then extract and run the installer. WebView2 installs automatically if missing.

  2. 2

    Add your API key

    On first launch, paste a DeepSeek or OpenAI-compatible key. It stays on your device — Zagens never sees it.

  3. 3

    Start a task

    Pick Code or Office mode, point it at a workspace, and let the agent plan, edit, and run with full replay.

In the box

A complete agent workspace

Everything you expect from a desktop harness — nothing hidden behind a cloud account.

Zagens running a long-horizon task with checklist, audit, and sub-agents panels open
  • File tree & live preview
  • Side-by-side diff panel
  • Session replay & audit log
  • Integrated terminal
  • MCP servers
  • Skills
  • System-tray notifications
  • Code & Office modes

Before you download

  • Windows 10 or 11 (64-bit)
  • A DeepSeek or OpenAI-compatible API key (stored locally)
  • Internet for model calls; WebView2 installs automatically if missing

Ready to put an agent to work?

Download the Windows preview and run your first long-horizon task in minutes.

Download for Windows Install guide

Frequently asked questions

How complete is the Long-Horizon Task (LHT) feature?

LHT is the most ambitious part of Zagens and is still actively being developed. The core loop — task planning, checklist tracking, session replay, and audit log — is functional, but you may hit rough edges in complex multi-step scenarios. We ship improvements with every preview build. Feedback and bug reports are very welcome.

Why does Windows SmartScreen warn me? Is it safe?

Zagens is not code-signed yet, which is normal for an early preview — it is not a virus warning. Download the zip, unblock it, then extract. Every artifact ships with a SHA-256 checksum so you can verify integrity.

Do I need a DeepSeek account or API key?

Yes. You bring your own DeepSeek or OpenAI-compatible API key. It is stored locally on your device (OS keyring where available) and never sent to a Zagens server.

Is my data sent anywhere?

Zagens is local-first. Workspace files are read and written on your machine. Data only leaves your device when a tool you invoke calls the network — for example your configured model provider or a web search.

Which AI models are supported?

Zagens is built around DeepSeek V4 (deepseek-chat / deepseek-reasoner) as the primary model. Any OpenAI-compatible endpoint works too — just point it at your provider's base URL. Other model families may be added in future releases.

Is macOS or Linux supported?

Not yet. The preview targets Windows 10/11 (x64). Other platforms may follow after the preview phase.