Mysti - AI Coding Agent

Your AI Coding Assistant for VSCode
Use Claude Code, Codex, or both together in Brainstorm Mode

Providers • Brainstorm • Features • Quick Start • Config

Choose Your AI

Mysti works with the AI coding tools you already have. No extra subscriptions needed.

Agent Selection

Provider	Best For
Claude Code	Deep reasoning, complex refactoring, thorough analysis
Codex	Quick iterations, familiar OpenAI style
Brainstorm Mode	Both AIs collaborate and debate solutions

Switch providers with one click. No lock-in.

See It In Action

Mysti Chat Interface

Beautiful, modern chat interface with syntax highlighting, markdown support, and mermaid diagrams

Brainstorm Mode

Want a second opinion? Enable Brainstorm Mode and let Claude Code AND Codex tackle your problem together.

Brainstorm Mode

Why Two AIs Beat One

Claude Code (Anthropic) and Codex (OpenAI) have different training, different strengths, and different blind spots. When they work together:

Claude catches edge cases Codex might miss
Codex suggests approaches Claude might overlook
Together they debate, challenge each other, and synthesize the best solution

It's like having a senior dev and a tech lead review your code—except they actually discuss it first.

How It Works

Your Request
     |
     v
+-----------+-----------+
|Claude Code|   Codex   |
| analyzes  | analyzes  |
+-----+-----+-----+-----+
      |           |
      v           v
+---------------------------+
|   Discussion (Full Mode)  |
| Agents review each other's|
| solutions and debate      |
+-----------+---------------+
            |
            v
+---------------------------+
|        Synthesis          |
| Best ideas combined into  |
| one refined solution      |
+---------------------------+

Two Collaboration Modes

Quick Mode	Full Mode
Direct synthesis	Agents discuss first
Claude + Codex respond, then merge	Each AI critiques the other's solution
Faster results	More thorough analysis
Good for simple tasks	Best for complex architecture decisions

Intelligent Plan Detection

When the AI presents multiple implementation approaches, Mysti automatically detects them and lets you choose your preferred path.

Plan Suggestions

Requires both Claude Code and Codex CLIs installed. See Requirements.

Key Features

16 Developer Personas

Shape how your AI thinks. Select from specialized personas that change the AI's approach to your problems.

Personas and Skills Panel

Persona	Focus
Architect	System design, scalability, clean structure
Debugger	Root cause analysis, bug fixing
Security-Minded	Vulnerabilities, threat modeling
Performance Tuner	Optimization, profiling, latency
Prototyper	Quick iteration, PoCs
Refactorer	Code quality, maintainability
+ 10 more...	Full-Stack, DevOps, Mentor, Designer...

Quick Persona Selection

Select personas directly from the toolbar without opening panels.

Toolbar Persona Selection

Smart Auto-Suggestions

Mysti automatically suggests relevant personas and actions based on your message.

Auto Suggestions

Conversation History

Never lose your work. All conversations are saved and easily accessible.

Conversation History

Quick Actions on Welcome

Get started fast with one-click actions for common tasks.

Quick Actions

Extensive Settings

Fine-tune every aspect of Mysti including token budgets, access levels, and brainstorm mode.

Settings Panel

Requirements

Already paying for Claude or ChatGPT? You're ready to go.

Mysti works with your existing subscriptions—no additional costs!

CLI Tool	Subscription	Install
Claude Code (recommended)	Anthropic API or Claude Pro/Max	`npm install -g @anthropic-ai/claude-code`
Codex CLI	OpenAI API	Follow OpenAI's installation guide

You only need one CLI to get started. Install both to unlock Brainstorm Mode.

Quick Start

1. Install a CLI Tool

# Claude Code (recommended)
npm install -g @anthropic-ai/claude-code

# Authenticate with your Anthropic account
claude auth login

For Brainstorm Mode, also install Codex CLI.

2. Open Mysti

Click the Mysti icon in the Activity Bar, or
Press Ctrl+Shift+M (Cmd+Shift+M on Mac)

3. Start Coding

Type your request and let the AI assist you!

12 Toggleable Skills

Mix and match behavioral modifiers:

Concise - Clear, brief communication
Test-Driven - Tests alongside code
Auto-Commit - Incremental commits
First Principles - Fundamental reasoning
Scope Discipline - Stay focused on the task
And 7 more...

Permission Controls

Stay in control of what the AI can do:

Read-only - AI can only read, never modify
Ask-permission - Approve each file change
Full-access - Let the AI work autonomously

Configuration

Essential Settings

{
  "mysti.defaultProvider": "claude-code",
  "mysti.brainstorm.enabled": true,
  "mysti.brainstorm.discussionMode": "full",
  "mysti.accessLevel": "ask-permission"
}

All Settings

Setting	Default	Description
`mysti.defaultProvider`	`claude-code`	Primary AI provider
`mysti.brainstorm.enabled`	`false`	Enable multi-agent mode
`mysti.brainstorm.discussionMode`	`quick`	`quick` or `full`
`mysti.accessLevel`	`ask-permission`	File access level
`mysti.agents.autoSuggest`	`true`	Auto-suggest personas

Keyboard Shortcuts

Action	Windows/Linux	Mac
Open Mysti	`Ctrl+Shift+M`	`Cmd+Shift+M`
Open in New Tab	`Ctrl+Shift+N`	`Cmd+Shift+N`

Commands

Command	Description
`Mysti: Open Chat`	Open the chat sidebar
`Mysti: New Conversation`	Start fresh
`Mysti: Add to Context`	Add file/selection to context
`Mysti: Clear Context`	Clear all context
`Mysti: Open in New Tab`	Open chat as editor tab

Telemetry

Mysti collects anonymous usage data to improve the extension:

Feature usage patterns
Error rates
Provider preferences

No code, file paths, or personal data is ever collected.

Respects VSCode's telemetry setting. Disable via: Settings > Telemetry: Telemetry Level > off

License

Business Source License 1.1 (BSL 1.1)

Free for personal, educational, and non-profit use
Commercial use requires a separate license
Converts to MIT License on December 3, 2030

Contact baha@deepmyst.com for commercial licensing.

Mysti - Built by DeepMyst Inc
_{Made with Claude Code}