Iimos

Iimos is an artificial intelligence agent that can fully modify its own source code, server, user interface, and tools.

Iimos is an agent application that ships as a single chat box and can fully modify itself. Its user interface, server, tools, and system prompt are all part of its own source code, and it can rewrite any of them when asked. It keeps everything local on your machine with no account or cloud dependency, and lets you bring any model endpoint compatible with the OpenAI Responses API. A snapshot is taken before every boot to roll back automatically if the code fails, and a separate recovery window is available. It is designed for users who want a self-modifying agent environment running locally with Node 22.5+ or macOS.

Iimos at a glance

Best for: Software engineer
Runs on: macOS, Windows, Linux
Pricing: Open source under MIT license
Released: October 2026
Category: AI agent tool
Website: github.com/yanglongyun/iimos

Key features

Rewrites its own React, CSS, system prompt, and tools
Runs entirely locally with no account or cloud
Uses any OpenAI Responses API compatible model
Takes automatic snapshots before every boot for safe rollbacks
Includes a separate recovery window for troubleshooting
Keeps user data separate from the application workspace

Use it for

Turn the chat interface into a custom desktop environment
Add new tools and data schedulers through chat prompts
Change the system prompt to run text adventure games
Recover automatically from intentional or accidental crashes

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