hippo_ppr_retrieve

P2.b — Personalized PageRank retrieval (HippoRAG

SERVERVerimem SOURCEaureliocpr-ctrl/verimem

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/verimem/hippo-ppr-retrieve.md

WHAT IT DOES

What hippo_ppr_retrieve does on Verimem

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

RISK

Why hippo_ppr_retrieve is rated Low

This tool retrieves ranked information from memory using graph-based ranking (PageRank). Retrieval operations have no side effects on data state—they only query and return results. No data is created, modified, deleted, or overwritten. No code is executed or external operations triggered. This is a straightforward Read category tool with low blast radius if misused by an agent.

From the tool's definition Tool name 'hippo_ppr_retrieve' and description 'Personalized PageRank retrieval' indicate a query/retrieval operation.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs hippo_ppr_retrieve safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Verimem, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For hippo_ppr_retrieve, this is the rule to start with:

hippo_ppr_retrieve Allowed

hippo_ppr_retrieve is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "hippo_ppr_retrieve": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Verimem, apply this rule, and every hippo_ppr_retrieve call is checked against it from then on.

FAQ

Questions about hippo_ppr_retrieve

What does the hippo_ppr_retrieve tool do? +

P2.b — Personalized PageRank retrieval (HippoRAG. It is categorised as a Read tool in the Verimem MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on hippo_ppr_retrieve? +

Register the Verimem MCP server in PolicyLayer and add a rule for hippo_ppr_retrieve: 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 Verimem. Nothing to install.

What risk level is hippo_ppr_retrieve? +

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

Can I rate-limit hippo_ppr_retrieve? +

Yes. Add a rate_limit block to the hippo_ppr_retrieve 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 hippo_ppr_retrieve completely? +

Set action: deny in the PolicyLayer policy for hippo_ppr_retrieve. 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 hippo_ppr_retrieve? +

hippo_ppr_retrieve is provided by the Verimem MCP server (aureliocpr-ctrl/verimem). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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