hippo_rank_facts_trust
FORGIA #298 — Round 14: composite trust score per
This record as markdown: /tools/verimem/hippo-rank-facts-trust.md
What hippo_rank_facts_trust does on Verimem
AI agents call hippo_rank_facts_trust 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.
Why hippo_rank_facts_trust is rated Low
The tool appears to assess or rank facts by a trust metric—a data retrieval and scoring operation with no side effects. The partial description ('composite trust score per') is uninformative about any write, execute, or destructive capabilities.
From the tool's definition Tool name 'hippo_rank_facts_trust' and description fragment 'composite trust score per' indicate the tool retrieves or computes trust metrics on existing facts without modifying data, executing code, or causing irreversible changes.
Attacks that exploit this kind of access
The rule that runs hippo_rank_facts_trust 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_rank_facts_trust, this is the rule to start with:
hippo_rank_facts_trust 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 Verimem, apply this rule, and every hippo_rank_facts_trust call is checked against it from then on.
Questions about hippo_rank_facts_trust
FORGIA #298 — Round 14: composite trust score per. It is categorised as a Read tool in the Verimem MCP Server, which means it retrieves data without modifying state.
Register the Verimem MCP server in PolicyLayer and add a rule for hippo_rank_facts_trust: 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.
hippo_rank_facts_trust 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 hippo_rank_facts_trust 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 hippo_rank_facts_trust. 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.
hippo_rank_facts_trust 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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