compose_ar_scene
Arrange several models into a single scene and get one link that reopens it exactly: same models, same positions, rotations and scales. Open that link on a phone and the whole arrangement stands in the real room. Coordinates are metres on the floor: x is right, z is forward with negative values f...
This record as markdown: /tools/3d-ar-studio-mcp/compose-ar-scene.md
What compose_ar_scene does on 3d Ar Studio
AI agents call compose_ar_scene to retrieve information from 3d Ar Studio without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
title | string | — | A name for the scene, used in the summary. |
models | array | Yes | The models to arrange, in placement order. |
page_url | string | — | The page hosting the studio. Defaults to the hosted demo. |
Parameters from the server's own tool schema.
Why compose_ar_scene is rated Low
Even though compose_ar_scene only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs compose_ar_scene safely
PolicyLayer is an MCP gateway: it sits between your AI agents and 3d Ar Studio, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For compose_ar_scene, this is the rule to start with:
compose_ar_scene is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect 3d Ar Studio, apply this rule, and every compose_ar_scene call is checked against it from then on.
Questions about compose_ar_scene
Arrange several models into a single scene and get one link that reopens it exactly: same models, same positions, rotations and scales. Open that link on a phone and the whole arrangement stands in the real room. Coordinates are metres on the floor: x is right, z is forward with negative values further away, so { x: 0, z: -2 } is two metres in front of the viewer. This is the tool to reach for when someone wants to see more than one thing at once. It is categorised as a Read tool in the 3d Ar Studio MCP Server, which means it retrieves data without modifying state.
compose_ar_scene accepts 3 parameters: title, models, page_url. Required: models. The full parameter table on this page comes from the server's own tool schema.
Register the 3d Ar Studio MCP server in PolicyLayer and add a rule for compose_ar_scene: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches 3d Ar Studio. Nothing to install.
compose_ar_scene is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the compose_ar_scene rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for compose_ar_scene. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
compose_ar_scene is provided by the 3d Ar Studio MCP server (3d-ar-studio-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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