Returns list of columns in the given table
AI agents call get_table_columns 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 tool retrieves database schema metadata (column definitions) without modifying data, executing code, or triggering side effects. It is purely informational and read-only. Low severity because accessing table schema information poses minimal risk even if misused by an agent.
From the tool's definition Tool description states 'Returns list of columns in the given table' - a retrieval operation with no modification or execution. Sibling tools (get_all_tables, get_table_foreign_key, get_table_primary_key) are all read-only metadata queries.
Attacks that exploit this kind of access
Returns list of columns in the given table. 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 get_table_columns: 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.
get_table_columns 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 get_table_columns 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 get_table_columns. 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.
get_table_columns is provided by the PostgreSQL MCP Server MCP server (physci/mcp). 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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