What is the Neural Link?

The Neural Link is a bi-directional bridge that connects AI agents directly to the Neo.mjs runtime. It lets agents inspect the Scene Graph, component state, event listeners, computed styles, and DOM rectangles, and mutate the running application in real time.

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

Neo.mjs maintains persistent application objects in a worker-backed Scene Graph instead of compiling application state away into ephemeral DOM nodes. That architecture enables multi-window orchestration, runtime permutation, and deep AI introspection.

What is Context Engineering?

Context Engineering shapes the information and tool environment around AI agents. Neo.mjs implements it through Knowledge Base, Memory Core, GitHub Workflow, and Neural Link MCP servers for frontier harnesses, plus a File System MCP server for internal Neo.ai.Agent local loops.

What is the Neo.mjs Agent OS?

The Neo.mjs Agent OS is the repository Brain: source code and services for Memory Core, Knowledge Base, Active Hybrid GraphRAG, DreamService, Golden Path synthesis, A2A coordination, and Neural Link tooling.

Frontmatter

id	14771
title	Tab overflow affordance: hidden-tab projection on heavy tabs nodes
state	Open
labels	enhancementai
assignees	[]
createdAt	Jul 4, 2026, 3:16 PM
updatedAt	3:05 PM
githubUrl	https://github.com/neomjs/neo/issues/14771
author	neo-fable-clio
commentsCount	1
parentIssue	13158
subIssues	[]
subIssuesCompleted	0
subIssuesTotal	0
contentTrust
projected
quarantined	0
signals	[]
blockedBy	[]
blocking	[]

Tab overflow affordance: hidden-tab projection on heavy tabs nodes

Open Backlog/active-chunk-4 enhancementai

neo-fable-clio commented on Jul 4, 2026, 3:16 PM

Context

ADR 0029 §2.4's projection half (learn/agentos/decisions/0029-harness-docking-design.md) — the second Qt-ADS parity bar: heavily-tabbed slots expose an overflow menu. Unfiled per the ADR §5 table. Filed to the delegatable bar: non-fable implementable.

The Problem

When a tabs node's headers exceed the available extent, hidden tabs are currently unreachable except by resize. Qt-class docking surfaces the remainder through an overflow control.

The Architectural Reality

Projection affordance, NOT a model change (ADR verbatim): nothing new persists — items order and activeItemId already capture the state.
Adapter tier: the dock tab projection in src/dashboard/DockLayoutAdapter.mjs, implemented against Neo.tab.Container's existing header mechanics.
Binding constraint: must NOT fork a dock-specific tab container (inherited from the model contract's §Split/Tab Adapter Boundary).
Selecting an overflow entry sets activeItemId via the ordinary semantic path — no new operation.

The Fix

One PR: overflow detection on header extent, a dropdown/control listing hidden tabs (title + kind icon per item record), selection routes through the existing active-item path, and the control disappears when everything fits. Unit floor where the projection logic is pure (hidden-set computation from widths); interaction coverage rides the existing dock example (examples/dashboard/dock, #13247 line).

Acceptance Criteria

Overflow control appears only when headers exceed extent; lists exactly the hidden set (pure computation spec).
Selection activates via the ordinary activeItemId path — zero new persisted state, zero new operations (review-checkable).
No dock-specific tab container fork (review-checkable).
Cross-family review.

Out of Scope

Grouped drag (#14770) · auto-hide rails (§2.7/#13280 line) · theming polish beyond the landed token layer.

Parent #13158 · authority ADR 0029 §2.4. Decision Record impact: aligned-with ADR 0029. Live latest-open sweep: latest 20 at 2026-07-04T13:15Z, no equivalent. A2A in-flight sweep: all-states 30 at 13:15Z, no competing claim. Origin Session ID: fa2a6fd5-7488-4af6-a0d2-3855c86003e4 Retrieval Hint: "tab overflow hidden tabs projection affordance"