list_tables · MCP Data Visualization Server MCP

WHAT IT DOES

What list_tables does on MCP Data Visualization Server

AI agents call list_tables to retrieve information from MCP Data Visualization Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why list_tables needs a policy

This tool retrieves and lists database table metadata without creating, modifying, deleting, executing code, or causing any state changes. It is a straightforward informational query, making it a Read-category tool with low severity. The modest blast radius comes from potential information disclosure about database schema to an unauthorized or compromised agent.

From the tool's definition Tool name is 'list_tables' and description states it 'List all available database tables with metadata' — a pure query/retrieval operation with no side effects.

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

POLICY

How to control list_tables

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

policy.json

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

list_tables 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 MCP Data Visualization Server — 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 MCP Data Visualization Server tools

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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 list_tables

What does the list_tables tool do? +

List all available database tables with metadata. It is categorised as a Read tool in the MCP Data Visualization Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_tables? +

Register the MCP Data Visualization Server MCP server in PolicyLayer and add a rule for list_tables: 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 MCP Data Visualization Server. Nothing to install.

What risk level is list_tables? +

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

Can I rate-limit list_tables? +

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

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

list_tables is provided by the MCP Data Visualization Server MCP server (xoniks/mcp-visualization-duckdb). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Data Visualization Server tool call.

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

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28 MCP Data Visualization Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.