postgres_describe_table
AI agents call postgres_describe_table to retrieve information from MCP Postgres Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves table structure and metadata from a PostgreSQL database. This is a read-only operation with no side effects—it queries and returns information about tables without modifying data or executing arbitrary operations. The empty description reduces confidence slightly, but the name strongly indicates a schema inspection capability typical of database exploration tools.
From the tool's definition Tool name is 'postgres_describe_table' which describes table schema/metadata. No destructive, write, execute, or financial operations are indicated.
Attacks that exploit this kind of access
postgres_describe_table. It is categorised as a Read tool in the MCP Postgres Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Postgres Server MCP server in PolicyLayer and add a rule for postgres_describe_table: 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 Server. Nothing to install.
postgres_describe_table 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 postgres_describe_table 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 postgres_describe_table. 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.
postgres_describe_table is provided by the MCP Postgres Server MCP server (madebynando/mcp-postgres-server). 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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