Get PostgreSQL server version
AI agents call pg_version to retrieve information from Database MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries server version information, which is a read-only operation that retrieves data without any capability to modify, delete, or execute code. The blast radius of misuse is minimal—version information is typically non-sensitive metadata. Confidence is high because the name and description are explicit and unambiguous.
From the tool's definition Tool name 'pg_version' and description 'Get PostgreSQL server version' indicate retrieval of metadata with no modification or side effects.
Attacks that exploit this kind of access
Get PostgreSQL server version. It is categorised as a Read tool in the Database MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Database MCP Server MCP server in PolicyLayer and add a rule for pg_version: 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 Database MCP Server. Nothing to install.
pg_version 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 pg_version 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 pg_version. 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.
pg_version is provided by the Database MCP Server MCP server (kunwarmahen/db-mcp-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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