hippo_skill_derive_predicates
FORGIA #213 — auto-derive STRIPS preconditions/post
This record as markdown: /tools/verimem/hippo-skill-derive-predicates.md
What hippo_skill_derive_predicates does on Verimem
AI agents invoke hippo_skill_derive_predicates to trigger actions in Verimem. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.
Why hippo_skill_derive_predicates is rated High
This tool automatically derives STRIPS-style preconditions and postconditions, which involves computational inference/generation logic rather than simple data retrieval or storage. The description is terse and partially truncated ('post' likely means 'postconditions'), lowering confidence. It appears to execute a derivation algorithm over existing knowledge to produce new logical structures.
From the tool's definition 'auto-derive STRIPS preconditions/post' — FORGIA #213 suggests automated derivation/generation of logical predicates (STRIPS preconditions and postconditions)
Attacks that exploit this kind of access
The rule that runs hippo_skill_derive_predicates 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_derive_predicates, this is the rule to start with:
hippo_skill_derive_predicates stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. 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_derive_predicates call is checked against it from then on.
Questions about hippo_skill_derive_predicates
FORGIA #213 — auto-derive STRIPS preconditions/post. It is categorised as a Execute tool in the Verimem MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Verimem MCP server in PolicyLayer and add a rule for hippo_skill_derive_predicates: 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_derive_predicates is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the hippo_skill_derive_predicates 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_derive_predicates. 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_derive_predicates 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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