generate_vanilla_js · Spline MCP: Risk & Policy

WHAT IT DOES

What generate_vanilla_js does on Spline

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

WHY IT NEEDS A POLICY

Why generate_vanilla_js needs a policy

Based on the tool name and sibling tools context (generate_react_component, generate_nextjs_component, generate_snippet, etc.), this tool likely generates vanilla JavaScript code for Spline.design integration. Code generation is a Write operation (creates new content). Confidence is low due to empty description.

From the tool's definition Tool name: generate_vanilla_js — no description provided

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_vanilla_js Rate-limited

generate_vanilla_js 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": {
    "generate_vanilla_js": {
      "limits": [
        {
          "counter": "generate_vanilla_js_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Spline, so you can run agents against it safely.

FAQ

Questions about generate_vanilla_js

What does the generate_vanilla_js tool do? +

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

How do I enforce a policy on generate_vanilla_js? +

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

What risk level is generate_vanilla_js? +

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

Can I rate-limit generate_vanilla_js? +

Yes. Add a rate_limit block to the generate_vanilla_js 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 generate_vanilla_js completely? +

Set action: deny in the PolicyLayer policy for generate_vanilla_js. 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 generate_vanilla_js? +

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