hippo_trajectory_fork
FORGIA #281 — fork a trajectory at step N for
This record as markdown: /tools/verimem/hippo-trajectory-fork.md
What hippo_trajectory_fork does on Verimem
AI agents use hippo_trajectory_fork to create or update resources in Verimem, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Verimem environment.
Why hippo_trajectory_fork is rated Medium
Forking a trajectory implies creating a new version or branch of an existing memory/reasoning path, which is a Write operation (creating new data). However, the description is truncated ('for' appears cut off), reducing confidence. The bi-temporal memory context suggests this creates a new timeline branch rather than deleting anything, so Destructive is unlikely.
From the tool's definition 'fork a trajectory at step N' — creates a new branch/copy of a trajectory at a specific point
Attacks that exploit this kind of access
The rule that runs hippo_trajectory_fork 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_trajectory_fork, this is the rule to start with:
hippo_trajectory_fork stays usable, but capped: an agent stuck in a loop can't make hundreds of changes 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_trajectory_fork call is checked against it from then on.
Questions about hippo_trajectory_fork
FORGIA #281 — fork a trajectory at step N for. It is categorised as a Write tool in the Verimem MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Verimem MCP server in PolicyLayer and add a rule for hippo_trajectory_fork: 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_trajectory_fork is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the hippo_trajectory_fork 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_trajectory_fork. 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_trajectory_fork 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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