crow_browser_load_session

THE RISK

Low Risk

Why crow_browser_load_session needs a policy

This tool retrieves and restores previously saved browser session state (cookies and storage). While restoration could be considered a write operation in a narrow sense, the primary function is to load/retrieve existing data without creating, modifying, or deleting underlying records. The tool has no side effects beyond re-establishing a known prior state.

From the tool's definition Tool name 'crow_browser_load_session' and description 'Restore a previously saved session (cookies and storage)' indicate retrieval and loading of stored session data without modification or destruction.

Documented attack patterns abuse exactly the kind of access crow_browser_load_session gives an agent:

POLICY

How to control crow_browser_load_session

PolicyLayer is an MCP gateway — it sits between your AI agents and Crow, and nothing reaches the server without passing your rules. This is the rule we recommend for crow_browser_load_session:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "crow_browser_load_session": {}
  }
}

crow_browser_load_session is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Crow — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about crow_browser_load_session

What does the crow_browser_load_session tool do? +

Restore a previously saved session (cookies and storage). It is categorised as a Read tool in the Crow MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on crow_browser_load_session? +

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

What risk level is crow_browser_load_session? +

crow_browser_load_session is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit crow_browser_load_session? +

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

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

crow_browser_load_session is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Crow tool call.

Start from Crow, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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