postgres_execute · Gmail & PostgreSQL MCP Server MCP

WHAT IT DOES

What postgres_execute does on Gmail & PostgreSQL MCP Server

AI agents invoke postgres_execute to trigger actions in Gmail & PostgreSQL MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why postgres_execute needs a policy

While DELETE is destructive, the tool's primary framing is execution of write statements (INSERT, UPDATE, DELETE) on specified rows/data. If the tool only permits parameterized deletes on existing rows without schema destruction (no DROP DATABASE, DROP TABLE), it is Execute rather than Destructive. However, if it permits unparameterized or arbitrary DELETE queries, severity should be critical.

From the tool's definition Tool description states 'Execute a write operation (INSERT, UPDATE, DELETE) on PostgreSQL database.' The term 'execute' combined with DELETE operations indicates code/query execution capability.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

postgres_execute Rate-limited

postgres_execute stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "postgres_execute": {
      "limits": [
        {
          "counter": "postgres_execute_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about postgres_execute

What does the postgres_execute tool do? +

Execute a write operation (INSERT, UPDATE, DELETE) on PostgreSQL database. It is categorised as a Execute tool in the Gmail & PostgreSQL MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on postgres_execute? +

Register the Gmail & PostgreSQL MCP Server MCP server in PolicyLayer and add a rule for postgres_execute: 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 Gmail & PostgreSQL MCP Server. Nothing to install.

What risk level is postgres_execute? +

postgres_execute is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit postgres_execute? +

Yes. Add a rate_limit block to the postgres_execute 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 postgres_execute completely? +

Set action: deny in the PolicyLayer policy for postgres_execute. 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 postgres_execute? +

postgres_execute is provided by the Gmail & PostgreSQL MCP Server MCP server (marouanemkm/gmail-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.