pg_duplicate_indexes

Find duplicate or overlapping indexes (same leading columns). Candidates for consolidation.

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-duplicate-indexes.md

WHAT IT DOES

What pg_duplicate_indexes does on PostgreSQL MCP Server

AI agents call pg_duplicate_indexes 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_duplicate_indexes is rated Low

This tool performs read-only analysis of PostgreSQL indexes to identify consolidation candidates. It queries system catalogs and compares index structures but does not modify, delete, or execute any changes. The output is informational metadata intended to guide manual optimization decisions. This is a classic Read category tool with minimal blast radius if misused by an agent.

From the tool's definition Tool description states it 'Find[s] duplicate or overlapping indexes' — a query operation that retrieves and analyzes index metadata. No modification, deletion, or execution of external operations occurs.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pg_duplicate_indexes 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_duplicate_indexes, this is the rule to start with:

pg_duplicate_indexes Allowed

pg_duplicate_indexes 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_duplicate_indexes": {}
  }
}

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_duplicate_indexes call is checked against it from then on.

FAQ

Questions about pg_duplicate_indexes

What does the pg_duplicate_indexes tool do? +

Find duplicate or overlapping indexes (same leading columns). Candidates for consolidation. 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_duplicate_indexes? +

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

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

Can I rate-limit pg_duplicate_indexes? +

Yes. Add a rate_limit block to the pg_duplicate_indexes 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_duplicate_indexes completely? +

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

pg_duplicate_indexes 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_duplicate_indexes does on PostgreSQL MCP Server

Why pg_duplicate_indexes is rated Low

The rule that runs pg_duplicate_indexes safely

Questions about pg_duplicate_indexes

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