Get estimated row counts for all tables using statistics (faster than COUNT(*)).
AI agents call PostgreSQL_get_estimated_row_counts 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.
This tool queries PostgreSQL statistics to retrieve estimated row counts. It performs no data modifications, deletions, or external operations. The word 'estimated' and 'statistics' confirm it reads pre-computed metadata rather than executing potentially expensive operations. This is a standard read operation with minimal blast radius if misused—worst case, an agent repeatedly calls it, causing minor I/O overhead.
From the tool's definition Tool description states it 'Get estimated row counts for all tables using statistics', which retrieves data without modification. The method uses statistical estimates rather than executing aggregate queries, making it a non-invasive read operation.
Documented attack patterns abuse exactly the kind of access PostgreSQL_get_estimated_row_counts 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_get_estimated_row_counts:
{
"version": "1",
"default": "deny",
"tools": {
"PostgreSQL_get_estimated_row_counts": {}
}
}PostgreSQL_get_estimated_row_counts is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get estimated row counts for all tables using statistics (faster than COUNT(*)). 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_get_estimated_row_counts: 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_get_estimated_row_counts 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_get_estimated_row_counts 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_get_estimated_row_counts. 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_get_estimated_row_counts 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.
239 Postgres tools catalogued and risk-classified — across an index of 43,000+ MCP servers.