Remove physics body from an object
AI agents use remove_physics to create or update resources in Threlte — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Threlte environment.
Removing a physics body modifies the object's properties (detaches physics simulation) but does not delete the object itself. This is a reversible modification — physics can be re-applied — making it a Write operation rather than Destructive. Misuse could break scene physics behavior but the object remains intact.
From the tool's definition Remove physics body from an object
Documented attack patterns abuse exactly the kind of access remove_physics gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Threlte, and nothing reaches the server without passing your rules. This is the rule we recommend for remove_physics:
{
"version": "1",
"default": "deny",
"tools": {
"remove_physics": {
"limits": [
{
"counter": "remove_physics_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}remove_physics stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Remove physics body from an object. It is categorised as a Write tool in the Threlte MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Threlte MCP server in PolicyLayer and add a rule for remove_physics: 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 Threlte. Nothing to install.
remove_physics is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the remove_physics 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 remove_physics. 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.
remove_physics is provided by the Threlte MCP server (serifeusstudio/threlte-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Threlte, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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