Identify potentially redundant or overlapping indexes.
AI agents call PostgreSQL_identify_index_redundancy to retrieve information from Postgres without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool inspects index definitions and usage patterns to report redundancy. This is purely informational analysis with no side effects, modifications, or destructive operations. It aligns with the 'analyze_*' pattern seen in sibling tools which are diagnostic in nature. Severity is low because misuse would only result in incorrect analysis recommendations, not data loss or unintended modifications.
From the tool's definition Tool performs analysis to 'Identify potentially redundant or overlapping indexes' — this is a diagnostic/read operation that queries index metadata and statistics without modifying database structure or data.
Documented attack patterns abuse exactly the kind of access PostgreSQL_identify_index_redundancy gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Postgres, and nothing reaches the server without passing your rules. This is the rule we recommend for PostgreSQL_identify_index_redundancy:
{
"version": "1",
"default": "deny",
"tools": {
"PostgreSQL_identify_index_redundancy": {}
}
}PostgreSQL_identify_index_redundancy is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Identify potentially redundant or overlapping indexes. It is categorised as a Read tool in the Postgres MCP Server, which means it retrieves data without modifying state.
Register the Postgres MCP server in PolicyLayer and add a rule for PostgreSQL_identify_index_redundancy: 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 Postgres. Nothing to install.
PostgreSQL_identify_index_redundancy is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the PostgreSQL_identify_index_redundancy 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.
Set action: deny in the PolicyLayer policy for PostgreSQL_identify_index_redundancy. 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.
PostgreSQL_identify_index_redundancy is provided by the Postgres MCP server (mukul975/postgres-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Postgres, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
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