debug_table_structure

THE RISK

Low Risk

Why debug_table_structure needs a policy

This tool retrieves and analyzes table structure information (layout, cell positions) for debugging purposes. It reads data about existing tables without creating, modifying, deleting, or executing any operations. The limited scope and informational nature warrant a 'Read' classification with low severity.

From the tool's definition Tool name 'debug_table_structure' and description 'Essential debugging tool for table layout and cell positions' indicate inspection/querying of table metadata and structure without modification or execution of external operations.

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

POLICY

How to control debug_table_structure

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

policy.json

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

debug_table_structure 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 VaultAssist — 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 debug_table_structure

What does the debug_table_structure tool do? +

Essential debugging tool for table layout and cell positions. It is categorised as a Read tool in the VaultAssist MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on debug_table_structure? +

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

What risk level is debug_table_structure? +

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

Can I rate-limit debug_table_structure? +

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

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

debug_table_structure is provided by the VaultAssist MCP server (3xcaffeine/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every VaultAssist tool call.

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

CHECK YOUR STACK →