hippo_audit_tail
FORGIA #196. Read the last N records of the MCP audit
This record as markdown: /tools/verimem/hippo-audit-tail.md
What hippo_audit_tail does on Verimem
AI agents call hippo_audit_tail 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_audit_tail is rated Low
This tool retrieves historical audit records for inspection/compliance purposes. It performs a query-like operation on audit logs (tail -equivalent), with no ability to modify, delete, or execute external operations. The read-only nature and bounded scope (last N records) make this a low-severity Read category tool. Confidence is high due to explicit 'Read' language in the description.
From the tool's definition Tool name includes 'audit_tail' and description states 'Read the last N records' — explicitly a read operation that retrieves audit log records without modification or side effects.
Attacks that exploit this kind of access
The rule that runs hippo_audit_tail 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_audit_tail, this is the rule to start with:
hippo_audit_tail 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_audit_tail call is checked against it from then on.
Questions about hippo_audit_tail
FORGIA #196. Read the last N records of the MCP audit. 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_audit_tail: 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_audit_tail 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_audit_tail 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_audit_tail. 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_audit_tail 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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