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MCP — build from Claude, Codex, or Cursor

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The simple flow (recommended)

1. Copy your MCP URL from Account settings → MCP / Claude
   Production: https://mcp.mythex.ai/mcp
2. In the client, add that URL as a custom MCP / connector
3. Click Connect
4. Your browser opens Mythex — sign in if needed, click Allow access
5. You’re done. Chat in Claude/Cursor and build

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Claude

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Cursor

{
  "mcpServers": {
    "mythex": {
      "url": "https://mcp.mythex.ai/mcp"
    }
  }
}

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Requirements for tools

• Pro plan (Connect works without it; tools return an upgrade error)
• Credits on your balance (empty balance → sandbox wake refused / sandboxes pause)

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What the client can do

• Create / open projects and wake sandboxes
• Read, write, edit, search files; run bash
• Preview via set_run_config / start / logs
• Env keys (set secrets you provide — values are not listed back)
• Database, storage, publish, checkpoints
• Browser run, web/media helpers, export/import, GitHub, domains

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What stays private

• Mythex agent system prompts and internals
• Platform secrets and other users’ projects
• Raw secret values via list_env_keys (keys only)

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Credits

• The external model is billed by that provider (Claude / Cursor / etc.)
• Mythex credits pay for live sandbox time and published hosting
• Empty balance → sandbox wake refused / sandboxes pause

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Related

• Account settings
• Credits
• Sandbox