pg_security_mask_data

Apply data masking to sensitive values. Supports email, phone, SSN, credit card, and partial masking.

SERVERPostgreSQL MCP Server SOURCE@neverinfamous/postgres-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-neverinfamous-postgres-mcp/pg-security-mask-data.md

WHAT IT DOES

What pg_security_mask_data does on PostgreSQL MCP Server

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

RISK

Why pg_security_mask_data is rated Medium

This tool writes/modifies existing data by applying masking transformations to sensitive columns. While masking can be considered a protective operation, it alters stored data values, making it a Write action.

From the tool's definition 'Apply data masking to sensitive values' — modifies data in place by transforming sensitive fields (email, phone, SSN, credit card)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pg_security_mask_data safely

PolicyLayer is an MCP gateway: it sits between your AI agents and PostgreSQL MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For pg_security_mask_data, this is the rule to start with:

pg_security_mask_data Rate-limited

pg_security_mask_data 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_security_mask_data": {
      "limits": [
        {
          "counter": "pg_security_mask_data_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect PostgreSQL MCP Server, apply this rule, and every pg_security_mask_data call is checked against it from then on.

FAQ

Questions about pg_security_mask_data

What does the pg_security_mask_data tool do? +

Apply data masking to sensitive values. Supports email, phone, SSN, credit card, and partial masking. It is categorised as a Write tool in the PostgreSQL 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_security_mask_data? +

Register the PostgreSQL MCP Server MCP server in PolicyLayer and add a rule for pg_security_mask_data: 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.

What risk level is pg_security_mask_data? +

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

Can I rate-limit pg_security_mask_data? +

Yes. Add a rate_limit block to the pg_security_mask_data 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_security_mask_data completely? +

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

pg_security_mask_data is provided by the PostgreSQL MCP Server MCP server (@neverinfamous/postgres-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

What pg_security_mask_data does on PostgreSQL MCP Server

Why pg_security_mask_data is rated Medium

The rule that runs pg_security_mask_data safely

Questions about pg_security_mask_data

More on PostgreSQL MCP Server, and thousands of servers like it.