get_tables

THE RISK

Low Risk

Why get_tables needs a policy

This tool performs read-only introspection of database schema information. It queries metadata about tables, foreign tables, and views (names, sizes, row counts) but does not execute any operations that create, modify, delete, or execute code. The blast radius of misuse is minimal—an AI could at worst discover the database structure, which is informational only.

From the tool's definition Tool name 'get_tables' and description 'List all tables, foreign tables, and views in a schema with their sizes, row counts, and metadata' indicate a query operation that retrieves database metadata without modifying or deleting any data.

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

POLICY

How to control get_tables

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

policy.json

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

get_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 Supabase MCP 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 Supabase MCP Server tools

Execute execute_sql_query Execute an SQL query with validation. Execute call_auth_admin_method Calls a method of the Python SDK client Execute live_dangerously Toggle between safe and unsafe operation modes for a specific service. Execute send_management_api_request send_management_api_request Read get_auth_admin_methods_spec Returns the Python SDK spec Read get_db_schemas List all database schemas with their sizes and table counts. Read get_management_api_safety_rules Get all safety rules for the Supabase Management API Read get_management_api_spec Get enriched API specification with safety information.

All 10 Supabase MCP Server 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 get_tables

What does the get_tables tool do? +

List all tables, foreign tables, and views in a schema with their sizes, row counts, and metadata. It is categorised as a Read tool in the Supabase MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_tables? +

Register the Supabase MCP Server MCP server in PolicyLayer and add a rule for get_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 Supabase MCP Server. Nothing to install.

What risk level is get_tables? +

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

Can I rate-limit get_tables? +

Yes. Add a rate_limit block to the get_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 get_tables completely? +

Set action: deny in the PolicyLayer policy for get_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 get_tables? +

get_tables is provided by the Supabase MCP Server MCP server (deploya-labs/mcp-supabase). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Supabase MCP Server tool call.

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

CHECK YOUR STACK →