What is the 'Neural Link'?

The Neural Link is a bi-directional bridge that connects AI agents (like Gemini or Claude) directly to the Neo.mjs runtime. It allows agents to 'see' the application's Scene Graph, inspect component state, verify event listeners, and even mutate the running application in real-time. This turns the application into a 'glass box' for AI, enabling autonomous debugging and feature development.

Why is Neo.mjs called an 'Application Engine' instead of a framework?

Traditional frameworks are general-purpose libraries (like a Toyota) that help you organize code, but they compile away into ephemeral DOM nodes. Neo.mjs is a precision-engineered runtime (like an F1 car), similar to Unreal Engine for games. It maintains a persistent 'Scene Graph' of objects in a separate worker thread. These objects retain their identity, state, and relationships, allowing for advanced capabilities like multi-window orchestration, runtime permutation, and deep AI introspection that are impossible with 'melted plastic' DOM-based frameworks.

What is 'Context Engineering'?

Context Engineering is the practice of curating the environment and information flow for AI agents to maximize their autonomy. In Neo.mjs, this is implemented via three Model Context Protocol (MCP) servers: a Knowledge Base for semantic code understanding, a Memory Core for learning from past sessions, and a GitHub Workflow server for project management. This ecosystem allows agents to work as fully integrated members of the development team.

What is 'Object Permanence' in the context of Neo.mjs?

In Neo.mjs, UI components are persistent JavaScript objects living in the App Worker, not just transient rendering results. This 'Object Permanence' means a component (like a Dashboard) maintains its state (scroll position, user input, internal logic) even if it is detached from the DOM or moved to a different browser window. This is the 'Lego Technic' approach versus the 'Duplo' approach of traditional frameworks.

What is an 'Agent Operating System'?

Neo.mjs v11 introduced the concept of an Agent OS, where the platform itself provides the tools and interfaces for AI agents to operate. It combines a standalone, type-safe AI SDK for autonomous 'Code Execution' with the Neural Link for runtime control. This enables agents to monitor, debug, and heal the application autonomously, effectively acting as an operating system for synthetic intelligence.

How does Neo.mjs handle multi-window applications?

Neo.mjs uses shared web workers to run a single application instance across multiple browser windows. All windows share the same application state and data in real-time. Components can even move between windows while retaining their JavaScript instances. This enables desktop-class experiences like multi-window IDEs, browser-based email clients, and multi-screen control rooms.

What makes Neo.mjs different from React, Angular, or Vue?

Neo.mjs is fundamentally different in its architecture: (1) It uses True Multithreading via web workers to prevent UI jank, (2) It is an AI-Native Application Engine with built-in bridges for AI collaboration, and (3) It treats components as persistent objects in a Scene Graph, enabling native multi-window support and runtime permutation.

Frontmatter

id	9416
title	Add Error State & Events for Async Tree Loading
state	Closed
labels	enhancementdeveloper-experienceaicore
assignees	tobiu
createdAt	Mar 9, 2026, 3:46 PM
updatedAt	Mar 9, 2026, 3:51 PM
githubUrl	https://github.com/neomjs/neo/issues/9416
author	tobiu
commentsCount	2
parentIssue	9404
subIssues	[]
subIssuesCompleted	0
subIssuesTotal	0
blockedBy	[]
blocking	[]
closedAt	Mar 9, 2026, 3:51 PM

Add Error State & Events for Async Tree Loading

Name: Neo.mjs Application Engine
Author: Neo.mjs

Closed v12.1.0 enhancementdeveloper-experienceaicore

tobiu commented on Mar 9, 2026, 3:46 PM

Goal

Enhance the TreeStore and TreeModel to formally communicate network failures during asynchronous subtree expansion, providing both visual state hooks and application-level events.

Architecture

TreeModel Update:
- Add hasError: Boolean (defaultValue: false) to track nodes that failed to load their children.
TreeStore Update (expand() method):
- When an async load() fails (catch block):
  - Set node.isLoading = false and node.hasError = true.
  - Fire recordChange to update the Grid UI (e.g., render a warning icon).
  - Fire a custom Store event: me.fire('loadError', { record: node, error: err }). This allows ViewControllers to catch the error and show a Toast notification.
- When expand() is called on a node that already has hasError = true (user retrying):
  - Clear the error state (node.hasError = false) before attempting the fetch again.

Dependencies

Depends on the core TreeStore async implementation (#9413).

tobiu added the enhancement label on Mar 9, 2026, 3:46 PM

tobiu added the developer-experience label on Mar 9, 2026, 3:46 PM

tobiu added the ai label on Mar 9, 2026, 3:46 PM

tobiu added the core label on Mar 9, 2026, 3:46 PM

tobiu added parent issue #9404 on Mar 9, 2026, 3:47 PM

tobiu assigned to @tobiu on Mar 9, 2026, 3:48 PM

tobiu referenced in commit 1ce6de0 - "feat: Add Error State & Events for Async Tree Loading (#9416) on Mar 9, 2026, 3:50 PM

tobiu Mar 9, 2026, 3:50 PM

Input from Gemini 3.1 Pro:

✦ Implemented Error State & Events for Async Tree Loading.

TreeModel now includes hasError (default false).

TreeStore.expand() sets hasError and fires a loadError event if the fetch fails, allowing graceful app-level recovery/notifications.

Added self-healing logic: re-clicking a failed node clears the error state and retries the fetch.

Changes pushed to dev.

tobiu Mar 9, 2026, 3:51 PM

Implemented Error State for Async Tree Loading. Pushed to dev.

tobiu closed this issue on Mar 9, 2026, 3:51 PM