hippo_stats_velocity
FORGIA #327 — Round 44: growth rate in rolling window.
This record as markdown: /tools/verimem/hippo-stats-velocity.md
What hippo_stats_velocity does on Verimem
AI agents call hippo_stats_velocity 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_stats_velocity is rated Low
This tool performs measurement and reporting of growth rate statistics within a defined time window. It retrieves and calculates aggregate data but does not create, modify, delete, or execute operations. This is consistent with Read category tools that analyze and return computed results without side effects.
From the tool's definition Tool computes 'growth rate in rolling window' — a statistical analysis operation that queries and retrieves metrics over a time period. No modification, deletion, or execution of external operations described.
Attacks that exploit this kind of access
The rule that runs hippo_stats_velocity 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_stats_velocity, this is the rule to start with:
hippo_stats_velocity 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_stats_velocity call is checked against it from then on.
Questions about hippo_stats_velocity
FORGIA #327 — Round 44: growth rate in rolling window. 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_stats_velocity: 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_stats_velocity 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_stats_velocity 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_stats_velocity. 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_stats_velocity 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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