Get a structured text description of everything on the canvas: element types,
AI agents call describe_scene to retrieve information from tldraw MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves canvas data (element types and their properties) without creating, modifying, or deleting any elements. It has no side effects and matches the Read category pattern of data retrieval operations like 'get' or 'fetch'. The blast radius of misuse is minimal—an AI agent can only learn what is currently on the canvas, with no ability to alter state or trigger external operations.
From the tool's definition Tool name 'describe_scene' and description 'Get a structured text description of everything on the canvas' indicates retrieval of canvas state without modification.
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
Get a structured text description of everything on the canvas: element types,. It is categorised as a Read tool in the tldraw MCP Server MCP Server, which means it retrieves data without modifying state.
Register the tldraw MCP Server MCP server in PolicyLayer and add a rule for describe_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 tldraw MCP Server. Nothing to install.
describe_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 describe_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 describe_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.
describe_scene is provided by the tldraw MCP Server MCP server (mihai-codes/tldraw-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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