crow_data_schema

THE RISK

Low Risk

Why crow_data_schema needs a policy

This is a metadata query operation that retrieves structural information about a database. It does not execute code, modify data, delete data, or trigger external side effects. The blast radius is minimal—schema information alone cannot harm systems, though it could inform reconnaissance. Classification as Read is appropriate.

From the tool's definition Tool performs introspection ('Get the schema') on database structure (tables, columns, types, row counts, indexes) without modifying data or executing queries against it.

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

POLICY

How to control crow_data_schema

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_data_schema:

policy.json

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

crow_data_schema 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.

CAP 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.
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_data_schema

What does the crow_data_schema tool do? +

Get the schema (tables, columns, types, row counts, indexes) for a registered SQLite database. 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_data_schema? +

Register the Crow MCP server in PolicyLayer and add a rule for crow_data_schema: 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_data_schema? +

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

Can I rate-limit crow_data_schema? +

Yes. Add a rate_limit block to the crow_data_schema 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_data_schema completely? +

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

crow_data_schema 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 →