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. It is designed to be used together with the PICO Unity Integration SDK 6.0.x and aligns its dependency baseline with that SDK (XR Interaction Toolkit 3.x).

Package name: com.bytedance.pico.mcp-extensions
Version: 0.0.6
Unity: 6000.0+
Author: ByteDance PICO

Related MCP server: AI-godot-mcp

Requirements

Features

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

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

Dual runtime support (PICO-native + OpenXR)

The building blocks compile and configure correctly under both PICO XR runtimes:

• PICO-native runtime (ENABLE_PICO_XR_SDK)

• OpenXR runtime (ENABLE_PICO_OPENXR_SDK) — VST enables the PICO PassthroughFeature; Spatial Mesh forces MultiPass rendering and enables the PICOSpatialMesh feature; Hand enables the Unity XR Hands models plus the PICO hand-tracking / hand-interaction OpenXR features.

Plane Detection is PICO-native only. PICO ships no plane-detection OpenXR feature, so under the OpenXR runtime the plane provider is never created and the block is a no-op.

Architecture

Editor/
  PXR_MCP_Common.cs        # Shared helpers: XR Origin lifecycle, module visibility
  PXR_MCP_Features.cs      # Building block implementations (VST, Controller, Locomotion, SpatialMesh, Plane, Hand, Grab)
  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 for building-block operations.
Layer 2 (Tools): [McpTool]-annotated methods that wrap Layer 1 and return PXR_MCP_Result envelopes.

MCP Tools

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)

License

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