List all tables in the public schema of the connected database. Returns table names, types (BASE TABLE or VIEW), and the schema they belong to.
AI agents call list_tables to retrieve information from Mcp Postgres Query without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs schema introspection only, querying database metadata without side effects. It cannot modify, delete, or execute operations—it merely enumerates existing tables. While it reveals database structure (minor information disclosure risk), the blast radius is minimal for an AI agent misusing this tool, as no data modification or external operations are possible.
From the tool's definition Tool 'list_tables' retrieves and lists table metadata (names, types, schema) from the database with no modification capability. Description states it 'returns table names, types, and schema' indicating pure data retrieval.
Attacks that exploit this kind of access
List all tables in the public schema of the connected database. Returns table names, types (BASE TABLE or VIEW), and the schema they belong to. It is categorised as a Read tool in the Mcp Postgres Query MCP Server, which means it retrieves data without modifying state.
Register the Mcp Postgres Query 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 Postgres Query. 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 Postgres Query MCP server (lordbasilaiassistant-sudo/mcp-postgres-query). 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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