PostgreSQL_index_scan_efficiency
Analyze index usage efficiency and identify unused indexes.
This record as markdown: /tools/mukul975-postgres-mcp-server/postgresql-index-scan-efficiency.md
What PostgreSQL_index_scan_efficiency does on Postgres
AI agents call PostgreSQL_index_scan_efficiency to retrieve information from Postgres without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why PostgreSQL_index_scan_efficiency is rated Low
This tool performs diagnostic analysis ('Analyze index usage efficiency') and reports findings ('identify unused indexes'). It queries system catalogs to gather performance metrics but does not create, modify, delete, or execute arbitrary operations on the database.
From the tool's definition Tool name and description indicate analysis of index usage and identification of unused indexes - retrieval and analysis of database metadata with no modification or deletion of data.
Attacks that exploit this kind of access
The rule that runs PostgreSQL_index_scan_efficiency safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Postgres, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For PostgreSQL_index_scan_efficiency, this is the rule to start with:
PostgreSQL_index_scan_efficiency is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Postgres, apply this rule, and every PostgreSQL_index_scan_efficiency call is checked against it from then on.
Questions about PostgreSQL_index_scan_efficiency
Analyze index usage efficiency and identify unused 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_index_scan_efficiency: 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_index_scan_efficiency 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_index_scan_efficiency 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_index_scan_efficiency. 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_index_scan_efficiency 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.
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