PostgreSQL_buffer_cache_hit_ratio
Analyze buffer cache hit ratios for all databases and tables.
This record as markdown: /tools/mukul975-postgres-mcp-server/postgresql-buffer-cache-hit-ratio.md
What PostgreSQL_buffer_cache_hit_ratio does on Postgres
AI agents call PostgreSQL_buffer_cache_hit_ratio 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_buffer_cache_hit_ratio is rated Low
This tool retrieves and analyzes performance metrics (buffer cache hit ratios) from PostgreSQL databases. It performs read-only diagnostic operations to assess cache performance without creating, modifying, deleting, or executing external operations. The blast radius if misused by an AI agent is minimal—it only accesses existing performance data.
From the tool's definition Tool name contains 'Analyze' and description states 'Analyze buffer cache hit ratios' - both indicate data retrieval and analysis only. No modification, deletion, execution of code, or financial operations are implied.
Attacks that exploit this kind of access
The rule that runs PostgreSQL_buffer_cache_hit_ratio 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_buffer_cache_hit_ratio, this is the rule to start with:
PostgreSQL_buffer_cache_hit_ratio 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_buffer_cache_hit_ratio call is checked against it from then on.
Questions about PostgreSQL_buffer_cache_hit_ratio
Analyze buffer cache hit ratios for all databases and tables. 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_buffer_cache_hit_ratio: 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_buffer_cache_hit_ratio 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_buffer_cache_hit_ratio 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_buffer_cache_hit_ratio. 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_buffer_cache_hit_ratio 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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