pg_stats_sampling

Get a random sample of rows. Use sampleSize for exact row count (any method), or percentage for approximate sampling with bernoulli/system methods.

SERVERPostgreSQL MCP Server SOURCE@neverinfamous/postgres-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-neverinfamous-postgres-mcp/pg-stats-sampling.md

WHAT IT DOES

What pg_stats_sampling does on PostgreSQL MCP Server

AI agents call pg_stats_sampling to retrieve information from PostgreSQL MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why pg_stats_sampling is rated Low

This tool retrieves a subset of rows from a PostgreSQL table for analysis purposes. It performs a SELECT operation with sampling logic (TABLESAMPLE or similar), which reads data without side effects. No data is created, modified, deleted, or executed. The blast radius of misuse is limited to information disclosure of sampled data, which is low severity.

From the tool's definition Tool description states 'Get a random sample of rows' with parameters for sampleSize and percentage, indicating data retrieval with no modification or deletion.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pg_stats_sampling 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_stats_sampling, this is the rule to start with:

pg_stats_sampling Allowed

pg_stats_sampling is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pg_stats_sampling": {}
  }
}

ALLOW ONLY 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_stats_sampling call is checked against it from then on.

FAQ

Questions about pg_stats_sampling

What does the pg_stats_sampling tool do? +

Get a random sample of rows. Use sampleSize for exact row count (any method), or percentage for approximate sampling with bernoulli/system methods. It is categorised as a Read tool in the PostgreSQL MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on pg_stats_sampling? +

Register the PostgreSQL MCP Server MCP server in PolicyLayer and add a rule for pg_stats_sampling: 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_stats_sampling? +

pg_stats_sampling is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit pg_stats_sampling? +

Yes. Add a rate_limit block to the pg_stats_sampling 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_stats_sampling completely? +

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

pg_stats_sampling 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_stats_sampling does on PostgreSQL MCP Server

Why pg_stats_sampling is rated Low

The rule that runs pg_stats_sampling safely

Questions about pg_stats_sampling

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