Spline V2 Rebuilds 3D Editor, Integrates External AI Coding Agents via MCP Server

Spline V2 and MCP Server Launch

Spline has launched V2, a completely rebuilt version of its 3D editor. A core feature of this release is the Spline MCP Server, which facilitates direct interaction between external coding agents and live, editable 3D scenes within the editor.

The MCP Server is bundled with the desktop application for macOS and Windows, allowing tools such as Claude Code, Cursor, Codex, Google Antigravity, and VS Code to modify scene elements and behaviors directly within a Spline project. This integration ensures that all AI-driven changes remain fully editable by the user.

How MCP Server Works

The MCP server operates locally within the Spline desktop application. Upon opening, it identifies supported client applications and registers itself in their configuration files. Developers can then restart their AI client and issue prompts, which the AI translates into structured MCP tool calls.

Spline routes these calls to an open 3D editor tab, where they execute against the live document. If no suitable file is open, the application can create one. This process allows AI models to observe the existing scene before making modifications, enabling a continuous workflow between visual design and code.

Maintaining Editability and Workflow

A key aspect of the MCP integration is that all changes made by AI agents are treated as standard editor operations. These changes are recorded in the undo history and synchronize with other collaborators working on the same file.

This approach ensures that designers receive a live, editable scene rather than a static image or mesh, allowing them to continue editing immediately after the AI agent completes its task. Spline's internal AI agent also follows this methodology, ensuring consistency in how AI-generated content is handled.