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	14913
title	DockCrossZoneDragNL red on dev: drop resolves to split, SortZone moveTo TypeError
state	Open
labels	bugaitestingregression
assignees	neo-opus-grace
createdAt	3:43 AM
updatedAt	6:34 AM
githubUrl	https://github.com/neomjs/neo/issues/14913
author	neo-opus-grace
commentsCount	1
parentIssue	null
subIssues	[]
subIssuesCompleted	0
subIssuesTotal	0
contentTrust
projected
quarantined	0
signals	[]
blockedBy	[]
blocking	[]

DockCrossZoneDragNL red on dev: drop resolves to split, SortZone moveTo TypeError

Open Backlog/active-chunk-4 bugaitestingregression

neo-opus-grace commented on 3:43 AM

Context

Discovered while running the full dock e2e set for PR #14906 (#14654/#14660). DockCrossZoneDragNL fails on PURE dev — verified by stashing every branch change and running at the branch base (ad9e5310b, current dev head lineage): same failure. This is a pre-existing dev regression, not fallout from the auto-hide work.

The Problem

The journey drags the Strategy tab header onto the Terminal tab header and asserts the committed model relocates strategy into terminal-tabs (tab-into). On current dev:

The committed result is a SPLIT instead: strategy: main-tabs -> tabs-strategy-0 (a fresh tabs node from a splitNode op) — the producer resolves an edge/split placement for a pointer released on the target zone's tab-header strip.
The drag additionally throws in the browser:

TypeError: Cannot read properties of undefined (reading 'moveTo')
    at DockTabSortZone.moveTo (src/draggable/tab/header/toolbar/SortZone.mjs:34)
    at DockTabSortZone.processDragEnd (src/draggable/container/SortZone.mjs:483)

Timeline hypothesis (unverified — for the investigator)

The spec landed green with the cross-zone slice (#14857 / PR #14864). The producer-routed dock drag rework (#14886 / PR #14898) later reshaped this exact path (previewToOperation producer pipeline + onDockCrossZoneDrop). Suspect the tab-header-strip pointer band now classifies as an edge/split placement instead of tab-into, and the source toolbar's within-container moveTo path lost a guard for cross-container drops. Both claims need falsification against the #14898 diff.

Reproducer

npx playwright test DockCrossZoneDragNL -c test/playwright/playwright.config.e2e.mjs --workers=1

Note: ensure the spawned web server serves YOUR checkout — a dev server from another clone squatting on 8080 silently serves the wrong tree (NEO_E2E_PORT override lands with PR #14906).

Acceptance Criteria

Root cause identified against the #14898 delta (producer band classification and/or SortZone moveTo guard).
DockCrossZoneDragNL green on dev.
No moveTo TypeError on cross-container header drops.
Cross-family review.

#14857 · #14864 · #14886 · #14898 · surfaced during PR #14906

Live latest-open sweep: checked latest 20 open issues + recent A2A claims at 2026-07-10T01:42Z; no equivalent found. Process note: filed during the operator-granted temporary Fable 5 window. Origin Session ID: ef6b9a4a-54ec-4afb-8438-f89a3ee46ad2 Retrieval Hint: "cross zone drag e2e red producer tab-into split moveTo undefined"