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PICO MCP Extensions

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PICO MCP Extensions

PICO XR feature construction APIs for Unity MCP agents. Idempotent, non-destructive, ambiguity-aware.

Overview

This Unity package exposes PICO XR building blocks as MCP (Model Context Protocol) tools, enabling AI agents (e.g. Unity AI Assistant) to programmatically configure XR scenes for PICO devices.

Package name: com.bytedance.pico.mcp-extensions
Version: 0.0.2
Unity: 2022.3+
Author: ByteDance PICO

Related MCP server: Blender MCP Server

Requirements

Dependency

Minimum Version

com.unity.xr.core-utils

2.3.0

com.unity.xr.interaction.toolkit

3.0.0

com.unity.inputsystem

1.7.0

Unity AI Assistant (Unity.AI.MCP.Editor)

2.x

com.bytedance.pico.xr

(project-installed)

Features

Four XR building blocks, each with Enable / Disable / Status semantics:

Block

Description

VST

Video See-Through (passthrough) - configures camera for transparent background and adds PXR_CameraEffectBlock

Controller

Mounts PICO controller visual models on Left/Right hand anchors

Locomotion

Enables XRI locomotion subtree with fine-grained presets (Move, Turn, Teleportation, GrabMove, Climb, Gravity, Jump)

Spatial Mesh

Configures PXR_SpatialMeshManager with auto-detected MeshPrefab (depends on VST)

Additionally, a Package tool manages Unity packages and samples (install / remove / update / import samples).

Architecture

Editor/
  PXR_MCP_Common.cs        # Shared helpers: XR Origin lifecycle, module visibility
  PXR_MCP_Features.cs      # Building block implementations (VST, Controller, Locomotion, SpatialMesh)
  PXR_MCP_PackageOps.cs    # Package Manager operations (add, remove, samples)
  Tools/
    PXR_MCP_Tools.cs       # MCP tool surface ([McpTool] entry points)
    PXR_MCP_Result.cs      # Uniform result envelope for LLM consumption

Layer 1 (Editor): Plain C# static methods + Unity MenuItems for manual validation.
Layer 2 (Tools): [McpTool]-annotated methods that wrap Layer 1 and return PXR_MCP_Result envelopes.

MCP Tools

Tool

Actions

Description

pico_xr_vst

Enable, Disable, Status

Manage Video See-Through

pico_xr_controller

Enable, Disable, Status

Manage PICO controller models

pico_xr_locomotion

Enable, Disable, Configure, Status

Manage locomotion with preset flags

pico_xr_spatial_mesh

Enable, Disable, Status

Manage spatial mesh (requires VST)

pico_xr_package

List, Info, Add, Remove, Update, ListSamples, ImportSample

Unity Package Manager operations

pico_xr_status

(none)

Aggregate snapshot of all blocks

Design Principles

  • Idempotent: Re-running any operation with the same arguments is a safe no-op.

  • Non-destructive: Never destroys or deactivates foreign (non-agent-owned) XR Origins.

  • Module isolation: Enabling one block does not implicitly enable unrelated modules. Initial-create hides Controller and Locomotion so VST stays clean.

  • No hardcoded versions: XRI paths and types are resolved dynamically via PackageInfo and reflection.

  • Undo-safe: All scene modifications go through Unity's Undo system.

Installation

Add this package to your Unity project via the Package Manager:

  1. Open Window > Package Manager

  2. Click + > Add package from disk... (or add to Packages/manifest.json)

  3. Ensure XRI Starter Assets sample is imported (required for XR Origin prefab)

Manual Testing (MenuItems)

All building blocks are accessible via the Unity menu:

  • PICO MCP > VST > Ensure / Remove

  • PICO MCP > Controller > Ensure / Remove

  • PICO MCP > Locomotion > Enable / Disable / Configure...

  • PICO MCP > Spatial Mesh > Ensure / Remove

  • PICO MCP > Packages > ...

License

Copyright (c) 2015-2022 PICO Technology Co., Ltd. All rights reserved. See LICENSE.md for details.

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