Get a list of all tables in the database along with their column information. Use this first to understand the database structure before querying.
AI agents call listTables to retrieve information from PostgreSQL MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a schema inspection tool that queries system catalogs to display structural information. It performs read-only operations on metadata and poses minimal risk even if invoked by an AI agent, as it cannot modify, delete, or execute code. The low severity reflects that exposure of table/column names may leak some schema information but causes no data loss or operational harm.
From the tool's definition Tool retrieves database metadata (table and column information) with no modification capability. Description explicitly states 'Get a list of all tables' and 'understand the database structure', indicating pure information retrieval without side effects.
Attacks that exploit this kind of access
Get a list of all tables in the database along with their column information. Use this first to understand the database structure before querying. It is categorised as a Read tool in the PostgreSQL MCP Server MCP Server, which means it retrieves data without modifying state.
Register the PostgreSQL MCP Server MCP server in PolicyLayer and add a rule for listTables: 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.
listTables is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the listTables 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.
Set action: deny in the PolicyLayer policy for listTables. 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.
listTables is provided by the PostgreSQL MCP Server MCP server (shreyans481/remote-mcp-server-with-auth). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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