hippo_find_stale_facts
FORGIA #290 — Round 7: time-decay. List facts older
This record as markdown: /tools/verimem/hippo-find-stale-facts.md
What hippo_find_stale_facts does on Verimem
AI agents call hippo_find_stale_facts 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_find_stale_facts is rated Low
The tool retrieves and lists facts by age/staleness criteria. There are no side effects, modifications, deletions, or external executions described. This is a straightforward data retrieval task consistent with Read category. Severity is low because misuse would only expose query results without operational impact.
From the tool's definition Tool name is 'hippo_find_stale_facts' and description states 'List facts older' — this is a query/retrieval operation that identifies aged facts without modifying, deleting, or executing actions.
Attacks that exploit this kind of access
The rule that runs hippo_find_stale_facts 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_find_stale_facts, this is the rule to start with:
hippo_find_stale_facts 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_find_stale_facts call is checked against it from then on.
Questions about hippo_find_stale_facts
FORGIA #290 — Round 7: time-decay. List facts older. 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_find_stale_facts: 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_find_stale_facts 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_find_stale_facts 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_find_stale_facts. 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_find_stale_facts 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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