rag · Pg MCP: Risk & Policy

WHAT IT DOES

What rag does on Pgmcp

AI agents call rag to retrieve information from Pgmcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

WHY IT NEEDS A POLICY

Why rag needs a policy

RAG tools are primarily retrieval mechanisms that query and fetch information from knowledge bases. Without description details, confidence is moderate, but the pattern of sibling tools (contextualize, embed_corpus, destroy_corpus, destroy_document) suggests this performs read operations on indexed knowledge.

From the tool's definition Tool name 'rag' with empty description. In context of a knowledge base management server, 'rag' typically refers to Retrieval-Augmented Generation, which retrieves data from a corpus without modifying it.

Attacks that exploit this kind of access

Questions about rag

What does the rag tool do? +

rag. It is categorised as a Read tool in the Pgmcp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on rag? +

Register the Pg MCP server in PolicyLayer and add a rule for rag: 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 Pgmcp. Nothing to install.

What risk level is rag? +

rag is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit rag? +

Yes. Add a rate_limit block to the rag 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.

How do I block rag completely? +

Set action: deny in the PolicyLayer policy for rag. 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.

What MCP server provides rag? +

rag is provided by the Pg MCP server (veloper/pgmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.