Show HN: Mysti – Claude, Codex, and Gemini debate your code, then synthesize

Your AI Coding team for VSCode

Providers • Brainstorm • Features • Quick Start • Config

From VS Code: Press Ctrl+P (Cmd+P on Mac), then paste:

ext install DeepMyst.mysti

Or install from the VS Code Marketplace

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

Switch providers with one click. No lock-in.

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

Want a second opinion? Enable Brainstorm Mode and let two AI agents tackle your problem together. Choose any 2 of 3 agents (Claude, Codex, or Gemini) from the settings panel.

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

• Each AI catches edge cases the other might miss
• Different perspectives lead to more robust solutions
• 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.

Configure which two agents collaborate in the Settings Panel:

Your Request
     |
     v
+-----------+-----------+
|  Agent 1  |  Agent 2  |
| analyzes  | analyzes  |
+-----+-----+-----+-----+
      |           |
      v           v
+---------------------------+
|   Discussion (Full Mode)  |
| Agents review each other's|
| solutions and debate      |
+-----------+---------------+
            |
            v
+---------------------------+
|        Synthesis          |
| Best ideas combined into  |
| one refined solution      |
+---------------------------+

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

Requires at least 2 CLI tools installed. See Requirements.

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

Select personas directly from the toolbar without opening panels.

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

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

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

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

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

Mysti works with your existing subscriptions—no additional costs!

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

Option A: Press Ctrl+P (Cmd+P on Mac), paste and run:

ext install DeepMyst.mysti

Option B: Install from VS Code Marketplace

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

# Or Gemini CLI
npm install -g @google/gemini-cli
gemini auth login

For Brainstorm Mode, install any two CLI tools.

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

Type your request and let the AI assist you!

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...

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

{
  "mysti.defaultProvider": "claude-code",
  "mysti.brainstorm.agents": ["claude-code", "google-gemini"],
  "mysti.brainstorm.discussionMode": "full",
  "mysti.accessLevel": "ask-permission"
}

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

MIT License — free to use, modify, and distribute, including for commercial purposes.

Install • Report Issue • GitHub

Mysti — Built by DeepMyst Inc