storage_count

THE RISK

Low Risk

Why storage_count needs a policy

This tool performs a simple read operation—counting documents in cloud storage. It has no side effects, does not modify or delete data, does not execute code, and does not involve financial transactions. The blast radius of misuse is minimal; an agent could only enumerate storage size, which poses no risk to data integrity or system stability.

From the tool's definition Tool name 'storage_count' and description 'Get the total number of documents' indicate a retrieval operation that queries storage metadata without modifying, deleting, or executing anything.

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

POLICY

How to control storage_count

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

policy.json

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

storage_count 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 Crawlbase MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Crawlbase MCP tools

Destructive storage_bulk_delete Bulk-delete up to 100 items from Crawlbase Cloud Storage by RID. Irreversible. Destructive storage_delete Delete a single item from Crawlbase Cloud Storage by RID. Read crawl Crawl a URL and return HTML content. Pass store=true to push the result to Crawlbase Cloud Read crawl_markdown Crawl a URL and extract clean markdown content. Pass store=true to persist the original pa Read crawl_screenshot Take a screenshot of a webpage. Pass store=true to persist the underlying HTML page to Clo Read storage_bulk_get Bulk-fetch up to 100 stored items by RID. Bodies are decoded automatically. Default as=met Read storage_get Retrieve a single stored page from Crawlbase Cloud Storage by RID or URL. Only works for p Read storage_list List RIDs of pages previously crawled with store=true in Crawlbase Cloud Storage. Supports

All 9 Crawlbase MCP tools →

Read tools on other servers

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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 storage_count

What does the storage_count tool do? +

Get the total number of documents in Crawlbase Cloud Storage. It is categorised as a Read tool in the Crawlbase MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on storage_count? +

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

What risk level is storage_count? +

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

Can I rate-limit storage_count? +

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

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

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

Enforce policy on every Crawlbase MCP tool call.

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

CHECK YOUR STACK →