hippo_decay_run
Cycle #110.C (2026-05-16). Run a confidence-decay pass
This record as markdown: /tools/verimem/hippo-decay-run.md
What hippo_decay_run does on Verimem
AI agents invoke hippo_decay_run 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_decay_run is rated High
This tool triggers an algorithmic process (confidence-decay pass) that mutates state within the memory engine—specifically the confidence scores or decay metrics of prior stored facts. While the operation appears to be a maintenance/housekeeping function rather than arbitrary code execution, it still *executes* a side-effecting operation whose outcome depends on the state of memories and decay parameters.
From the tool's definition Tool name 'hippo_decay_run' with verb 'run' combined with description 'Run a confidence-decay pass' indicates execution of an internal operation that processes or modifies confidence metadata associated with stored memories.
Attacks that exploit this kind of access
The rule that runs hippo_decay_run 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_decay_run, this is the rule to start with:
hippo_decay_run 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_decay_run call is checked against it from then on.
Questions about hippo_decay_run
Cycle #110.C (2026-05-16). Run a confidence-decay pass. 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_decay_run: 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_decay_run 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_decay_run 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_decay_run. 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_decay_run 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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