pg_schema_snapshot

Get a complete schema snapshot in a single agent-optimized JSON structure. Includes tables, columns, types, constraints, indexes, triggers, sequences, and extensions.

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-schema-snapshot.md

WHAT IT DOES

What pg_schema_snapshot does on PostgreSQL MCP Server

AI agents call pg_schema_snapshot 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_schema_snapshot is rated Low

This is a read-only query operation that retrieves database schema information and returns it in a structured format. It has no side effects, does not execute code, does not modify data, and does not delete or affect the database state. The blast radius of misuse is minimal—an AI agent could only gather schema metadata, which might reveal structural information but cannot cause damage or make changes.

From the tool's definition Tool description states 'Get a complete schema snapshot' — retrieves schema metadata (tables, columns, types, constraints, indexes, triggers, sequences, extensions) without modification or execution of operations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pg_schema_snapshot 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_schema_snapshot, this is the rule to start with:

pg_schema_snapshot Allowed

pg_schema_snapshot 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_schema_snapshot": {}
  }
}

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_schema_snapshot call is checked against it from then on.

FAQ

Questions about pg_schema_snapshot

What does the pg_schema_snapshot tool do? +

Get a complete schema snapshot in a single agent-optimized JSON structure. Includes tables, columns, types, constraints, indexes, triggers, sequences, and extensions. 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_schema_snapshot? +

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

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

Can I rate-limit pg_schema_snapshot? +

Yes. Add a rate_limit block to the pg_schema_snapshot 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_schema_snapshot completely? +

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

pg_schema_snapshot 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_schema_snapshot does on PostgreSQL MCP Server

Why pg_schema_snapshot is rated Low

The rule that runs pg_schema_snapshot safely

Questions about pg_schema_snapshot

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