save_storage_state

A write tool on the Playwright MCP server.

SERVERPlaywright MCP Server SOURCEalexrwilliam/playwright-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/alexrwilliam-playwright-mcp-server/save-storage-state.md

WHAT IT DOES

What save_storage_state does on Playwright MCP Server

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

RISK

Why save_storage_state is rated Medium

Based on the tool name, 'save_storage_state' likely captures and persists the current browser storage state (cookies, localStorage, sessionStorage) to a file or persistent location. This is a Write operation as it creates or modifies stored data. However, the empty description significantly lowers confidence.

From the tool's definition Tool name: save_storage_state; description is empty/uninformative.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs save_storage_state safely

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

save_storage_state Rate-limited

save_storage_state 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": {
    "save_storage_state": {
      "limits": [
        {
          "counter": "save_storage_state_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 Playwright MCP Server, apply this rule, and every save_storage_state call is checked against it from then on.

FAQ

Questions about save_storage_state

What does the save_storage_state tool do? +

save_storage_state is a write tool on the Playwright MCP Server MCP server. It is categorised as a Write tool in the Playwright 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 save_storage_state? +

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

What risk level is save_storage_state? +

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

Can I rate-limit save_storage_state? +

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

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

save_storage_state is provided by the Playwright MCP Server MCP server (alexrwilliam/playwright-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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