hippo_failure_clusters
FORGIA #321 — Round 38: cluster failed episodes +
This record as markdown: /tools/verimem/hippo-failure-clusters.md
What hippo_failure_clusters does on Verimem
AI agents call hippo_failure_clusters 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_failure_clusters is rated Low
The tool appears to analyze and group past failure episodes from the memory system, which is a read-only analytical operation. There is no indication the tool modifies, deletes, or executes external actions. Within the context of a 'self-correcting' bi-temporal memory engine, clustering failures for review aligns with diagnostic reading rather than data mutation or destruction.
From the tool's definition Tool name includes 'cluster' (analysis operation) and description references 'cluster failed episodes' — a retrieval and grouping of historical failure data.
Attacks that exploit this kind of access
The rule that runs hippo_failure_clusters 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_failure_clusters, this is the rule to start with:
hippo_failure_clusters 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_failure_clusters call is checked against it from then on.
Questions about hippo_failure_clusters
FORGIA #321 — Round 38: cluster failed episodes +. 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_failure_clusters: 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_failure_clusters 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_failure_clusters 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_failure_clusters. 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_failure_clusters 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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