DeepMyst/Mysti

What is it?

Key features

• 01Sends one question to several agents such as Claude Code and Codex and shows each answer separately.
• 02Chains agent tasks with "then" so one agent's result feeds the next.
• 03Brainstorm mode runs debate, red-team and other discussion strategies between two agents.
• 04Supports 16 provider adapters, including CLI agents, Ollama, LocalAI and OpenRouter.
• 05Shows approval modes and tool activity, and supports cancelling active assignments.
• 06Provides workspace checkpoints for supported local changes.

Use cases

• Getting a second opinion from another agent on a code change or design question.
• Having one agent write code and another review it in the same VS Code session.
• Running structured debates on an architecture decision before committing to it.
• Using local models through Ollama alongside cloud coding agents.

Quick start

1. 1

   Install Mysti from the VS Code Marketplace

2. 2

   Clone the repo and install dependencies

   npm ci
3. 3

   Launch the extension development host by pressing F5 in VS Code

Things to know

• !This is a 2.0 beta; the README advises caution before using it for important work.
• !You need your own DeepMyst account for Mysti features, and CLI agents need their own credentials and subscriptions.
• !Provider support varies by adapter, and not every provider or account combination has been live-tested.

Topics

FAQ

What is Mysti?

A VS Code extension that puts Claude Code, Codex and other coding agents in one conversation, so they can give separate opinions, hand off work and debate solutions. Mysti is an open-source coding workspace for VS Code. It connects CLI coding agents such as Claude Code, OpenAI Codex and Gemini CLI, along with local model servers like Ollama and API providers such as OpenRouter, and keeps their responses, context and permissions in a single conversation.

Is Mysti free to use? What license does it have?

Mysti is open source under the Apache-2.0 license. Check the license terms before using it in commercial products.

Is Mysti still maintained?

Actively maintained. The last commit to Mysti was on Oct 13, 2026.

What can I use Mysti for?

Getting a second opinion from another agent on a code change or design question. Having one agent write code and another review it in the same VS Code session. Running structured debates on an architecture decision before committing to it. Using local models through Ollama alongside cloud coding agents.

How do I install Mysti?

Install Mysti from the VS Code Marketplace Clone the repo and install dependencies: npm ci Launch the extension development host by pressing F5 in VS Code

Where can I get Mysti?

The source code and installation instructions are on GitHub: https://github.com/DeepMyst/Mysti