set_storage · DOM Analyzer MCP Server MCP: Risk & Policy

WHAT IT DOES

What set_storage does on DOM Analyzer MCP Server

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

WHY IT NEEDS A POLICY

Why set_storage needs a policy

The tool modifies localStorage and sessionStorage, which are reversible changes to application state. While this could affect application behavior (since stored data often drives logic), it does not irreversibly delete data (would be Destructive), execute arbitrary code (would be Execute), or move money (would be Financial).

From the tool's definition Tool name 'set_storage' and description 'Imposta localStorage/sessionStorage' (Italian: 'Set localStorage/sessionStorage') directly modifies browser storage. This is a write operation that creates or modifies data in the browser's storage mechanisms.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_storage Rate-limited

set_storage 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": {
    "set_storage": {
      "limits": [
        {
          "counter": "set_storage_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 DOM Analyzer MCP Server, so you can run agents against it safely.

FAQ

Questions about set_storage

What does the set_storage tool do? +

Imposta localStorage/sessionStorage. It is categorised as a Write tool in the DOM Analyzer 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 set_storage? +

Register the DOM Analyzer MCP Server MCP server in PolicyLayer and add a rule for set_storage: 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 DOM Analyzer MCP Server. Nothing to install.

What risk level is set_storage? +

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

Can I rate-limit set_storage? +

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

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

set_storage is provided by the DOM Analyzer MCP Server MCP server (sudo-elia/dom-analyzer-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.