crow_browser_export

THE RISK

Medium Risk

Why crow_browser_export needs a policy

This tool creates new files (CSV or JSON exports) from existing scraped data. While not destructive (the original data remains), it performs a write operation by generating and exporting data artifacts.

From the tool's definition 'Export previously scraped data as CSV or JSON file' — creates and outputs a file containing data in a specified format, which is a write/output operation.

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

POLICY

How to control crow_browser_export

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_export:

policy.json

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

crow_browser_export 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.

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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about crow_browser_export

What does the crow_browser_export tool do? +

Export previously scraped data as CSV or JSON file. It is categorised as a Write tool in the Crow MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on crow_browser_export? +

Register the Crow MCP server in PolicyLayer and add a rule for crow_browser_export: 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_export? +

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

Can I rate-limit crow_browser_export? +

Yes. Add a rate_limit block to the crow_browser_export 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_export completely? +

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

crow_browser_export 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.

CHECK YOUR STACK →