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AI agents call get_table_primary_key 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 schema metadata from PostgreSQL without any side effects. It queries structural information about primary keys, which is read-only data retrieval. There is no execution of arbitrary code, no data modification, deletion, or financial operations involved. The worst-case misuse would be unauthorized information disclosure about database schema, which is a low-severity risk.
From the tool's definition Tool name 'get_table_primary_key' and server description indicate querying of PostgreSQL database metadata (specifically primary key information) with no modification or deletion capability.
Attacks that exploit this kind of access
". 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_primary_key: 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_primary_key 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_primary_key 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_primary_key. 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_primary_key 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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