pg_insert_row · Database MCP Server MCP: Risk & Policy

WHAT IT DOES

What pg_insert_row does on Database MCP Server

AI agents use pg_insert_row to create or update resources in Database MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Database MCP Server environment.

WHY IT NEEDS A POLICY

Why pg_insert_row needs a policy

This tool creates new records in a database table, which is a reversible write operation. It does not delete or destroy data (ruling out Destructive), does not execute arbitrary code (ruling out Execute), and does not move money (ruling out Financial).

From the tool's definition Tool name 'pg_insert_row' and description 'Insert row into table and return id' explicitly perform data creation/modification operations on a PostgreSQL database.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pg_insert_row Rate-limited

pg_insert_row stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pg_insert_row": {
      "limits": [
        {
          "counter": "pg_insert_row_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Database MCP Server, so you can run agents against it safely.

FAQ

Questions about pg_insert_row

What does the pg_insert_row tool do? +

Insert row into table and return id. It is categorised as a Write tool in the Database MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on pg_insert_row? +

Register the Database MCP Server MCP server in PolicyLayer and add a rule for pg_insert_row: 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.

What risk level is pg_insert_row? +

pg_insert_row is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit pg_insert_row? +

Yes. Add a rate_limit block to the pg_insert_row 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.

How do I block pg_insert_row completely? +

Set action: deny in the PolicyLayer policy for pg_insert_row. 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.

What MCP server provides pg_insert_row? +

pg_insert_row 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.