Feature Request: reorder_children / move_node tool for MCP

[opalsaints]

Feature Request: Reorder children within a parent node

Context: Using Paper MCP from Claude Code (Claude Agent SDK via MCP). Building long scrolling artboards (e.g., full landing page mockups with 11+ sections).

Problem

Currently write_html with insert-children mode always appends new nodes at the end of the parent's children list. There is no way to:

1. Insert a child at a specific index (e.g., "insert after the 3rd child")
2. Reorder existing children (e.g., "move child X to position 5")
3. Move a node from one parent to another while preserving it

Current Workaround

When I need to insert a section between existing sections (e.g., adding "Stage: Live" between "Stage: Publish" and "Try It Now"), I have to:

1. Delete all sections after the insertion point
2. Add the new section
3. Re-create all deleted sections from scratch

This is extremely wasteful — it requires re-writing potentially hundreds of nodes, loses any manual edits made in the Paper UI, and consumes many API calls.

Proposed Solutions

Any of these would solve the problem:

• reorder_children tool — accepts a parent node ID and an ordered array of child IDs
• move_node tool — accepts a node ID, target parent ID, and target index
• write_html with insertAt parameter — e.g., mode: "insert-children" with an optional index or afterNodeId parameter

Use Case

Building full-page design mockups iteratively with an AI agent (Claude Code via MCP). The agent builds sections top-to-bottom, but frequently needs to insert, reorder, or fix sections in the middle without destroying everything below.

Environment

• Claude Code (Claude Agent SDK)
• Paper MCP server
• Building complex multi-section artboards (1440px × 9000px+ desktop landing pages)