get_table_schema

Get the schema definition for a specified table.

SERVERPostgreSQL MCP Server SOURCEaadarshjain/postgres-mcp-server

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade C, identity unverified Pull the record →

This record as markdown: /tools/aadarshjain-postgres-mcp-server/get-table-schema.md

WHAT IT DOES

What get_table_schema does on PostgreSQL MCP Server

AI agents call get_table_schema to retrieve information from PostgreSQL MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why get_table_schema is rated Low

This tool retrieves structural metadata about a table (column names, types, constraints) without executing code, modifying data, or triggering external operations. It is a pure read operation with no side effects. Severity is low because schema information is typically non-sensitive or already known to users with database access, and misuse cannot alter or destroy data.

From the tool's definition Tool description states 'Get the schema definition for a specified table' — a query operation with no modification or deletion capability.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_table_schema safely

PolicyLayer is an MCP gateway: it sits between your AI agents and PostgreSQL MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For get_table_schema, this is the rule to start with:

get_table_schema Allowed

get_table_schema is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect PostgreSQL MCP Server, apply this rule, and every get_table_schema call is checked against it from then on.

FAQ

Questions about get_table_schema

What does the get_table_schema tool do? +

Get the schema definition for a specified table. It is categorised as a Read tool in the PostgreSQL MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_table_schema? +

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

What risk level is get_table_schema? +

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

Can I rate-limit get_table_schema? +

Yes. Add a rate_limit block to the get_table_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 get_table_schema completely? +

Set action: deny in the PolicyLayer policy for get_table_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 get_table_schema? +

get_table_schema is provided by the PostgreSQL MCP Server MCP server (aadarshjain/postgres-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

What get_table_schema does on PostgreSQL MCP Server

Why get_table_schema is rated Low

The rule that runs get_table_schema safely

Questions about get_table_schema

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