pg_stats_outliers
Detect statistical outliers in a numeric column using IQR (interquartile range) or Z-score method. IQR is robust against non-normal distributions.
This record as markdown: /tools/io-github-neverinfamous-postgres-mcp/pg-stats-outliers.md
What pg_stats_outliers does on PostgreSQL MCP Server
AI agents call pg_stats_outliers 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.
Why pg_stats_outliers is rated Low
This is a data analysis and querying tool that examines numeric columns to identify outliers. It reads from the database and computes statistics, making it a Read operation. The severity is low because detecting outliers has no blast radius—it cannot modify data, delete records, or trigger external operations.
From the tool's definition Tool performs statistical analysis ('Detect statistical outliers') on existing data using IQR or Z-score methods. No modification, deletion, or execution of arbitrary code is involved. It retrieves and analyzes data without side effects.
Attacks that exploit this kind of access
The rule that runs pg_stats_outliers 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_outliers, this is the rule to start with:
pg_stats_outliers 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 PostgreSQL MCP Server, apply this rule, and every pg_stats_outliers call is checked against it from then on.
Questions about pg_stats_outliers
Detect statistical outliers in a numeric column using IQR (interquartile range) or Z-score method. IQR is robust against non-normal distributions. It is categorised as a Read tool in the PostgreSQL MCP Server MCP Server, which means it retrieves data without modifying state.
Register the PostgreSQL MCP Server MCP server in PolicyLayer and add a rule for pg_stats_outliers: 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.
pg_stats_outliers 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 pg_stats_outliers 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 pg_stats_outliers. 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.
pg_stats_outliers 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.
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