supported_formats

THE RISK

Low Risk

Why supported_formats needs a policy

This tool retrieves informational metadata about what the system supports. It is a pure query/list operation with no side effects, no data access, no code execution, and no modifications. It falls clearly into the Read category. Severity is low because the information disclosed is about system capabilities rather than sensitive user data, and misuse by an AI agent would be limited to requesting redundant information.

From the tool's definition Tool name 'supported_formats' and description 'List supported database formats and connection methods' indicate a retrieval operation that queries available metadata about supported formats and connection options without modifying, executing operations on, or…

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

POLICY

How to control supported_formats

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 supported_formats:

policy.json

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

supported_formats 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 →

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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 →
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FAQ

Questions about supported_formats

What does the supported_formats tool do? +

List supported database formats and connection methods. 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 supported_formats? +

Register the MCP Data Visualization Server MCP server in PolicyLayer and add a rule for supported_formats: 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 supported_formats? +

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

Can I rate-limit supported_formats? +

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

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

supported_formats 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.

CHECK YOUR STACK →