Obtiene una lista de todas las tablas disponibles en la base de datos
AI agents call list_tables to retrieve information from MCP PostgreSQL Read-Only Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about database tables without modifying any data. It has no side effects and cannot alter database state. The severity is low because even if misused by an agent, listing tables only exposes schema structure and does not access sensitive data values or modify the database.
From the tool's definition Tool name 'list_tables' and description 'Obtiene una lista de todas las tablas disponibles en la base de datos' (Gets a list of all available tables in the database) indicate schema introspection.
Attacks that exploit this kind of access
Obtiene una lista de todas las tablas disponibles en la base de datos. It is categorised as a Read tool in the MCP PostgreSQL Read-Only Server MCP Server, which means it retrieves data without modifying state.
Register the MCP PostgreSQL Read-Only Server MCP server in PolicyLayer and add a rule for list_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 MCP PostgreSQL Read-Only Server. Nothing to install.
list_tables 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 list_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.
Set action: deny in the PolicyLayer policy for list_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.
list_tables is provided by the MCP PostgreSQL Read-Only Server MCP server (japentaca/mcp-postgres-readonly). 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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