setVariable

A write tool on the Spline MCP server.

SERVERSpline MCP Server SOURCEaydinfer/spline-mcp-server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/aydinfer-spline-mcp-server/setvariable.md

WHAT IT DOES

What setVariable does on Spline MCP Server

AI agents use setVariable to create or update resources in Spline MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Spline MCP Server environment.

RISK

Why setVariable is rated Medium

setVariable creates or modifies state within the Spline design tool, which is reversible and has no permanent destructive effects. This fits the Write category - modifying data without deletion. Severity is medium because unintended variable changes could corrupt a design session, but modifications are typically reversible.

From the tool's definition Tool name 'setVariable' indicates modification of variables/state within the Spline 3D design environment. Sibling tools (addCamera, addDirectionalLight, addMaterialLayer, etc.) show this server modifies 3D scene properties and design state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs setVariable safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Spline MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For setVariable, this is the rule to start with:

setVariable Rate-limited

setVariable 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "setVariable": {
      "limits": [
        {
          "counter": "setvariable_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Spline MCP Server, apply this rule, and every setVariable call is checked against it from then on.

FAQ

Questions about setVariable

What does the setVariable tool do? +

setVariable is a write tool on the Spline MCP Server MCP server. It is categorised as a Write tool in the Spline MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on setVariable? +

Register the Spline MCP Server MCP server in PolicyLayer and add a rule for setVariable: 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 Spline MCP Server. Nothing to install.

What risk level is setVariable? +

setVariable is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit setVariable? +

Yes. Add a rate_limit block to the setVariable 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.

How do I block setVariable completely? +

Set action: deny in the PolicyLayer policy for setVariable. 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.

What MCP server provides setVariable? +

setVariable is provided by the Spline MCP Server MCP server (aydinfer/spline-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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