hippo_skill_diff_render
FORGIA #243 — markdown side-by-side diff of two
This record as markdown: /tools/verimem/hippo-skill-diff-render.md
What hippo_skill_diff_render does on Verimem
AI agents call hippo_skill_diff_render 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_skill_diff_render is rated Low
Rendering a diff is a read-only operation that retrieves and presents existing data in a formatted view. The incomplete description ('markdown side-by-side diff of two' — likely 'of two [skills]') doesn't suggest data modification, deletion, execution, or financial impact.
From the tool's definition Tool name 'hippo_skill_diff_render' and description indicate it renders a 'markdown side-by-side diff' — a comparative display/visualization operation with no mutation or execution capabilities.
Attacks that exploit this kind of access
The rule that runs hippo_skill_diff_render 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_skill_diff_render, this is the rule to start with:
hippo_skill_diff_render 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_skill_diff_render call is checked against it from then on.
Questions about hippo_skill_diff_render
FORGIA #243 — markdown side-by-side diff of two. 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_skill_diff_render: 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_skill_diff_render 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_skill_diff_render 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_skill_diff_render. 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_skill_diff_render 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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