AI agents call memento_kg_health to retrieve information from Memento without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves diagnostic and statistical information about an internal knowledge graph structure. It performs read-only queries to gather metadata about the graph's state (entity counts, triple counts, predicate distribution, temporal coverage). There are no mutations, deletions, code execution, or external operations. The deprecated status further reduces risk.
From the tool's definition Tool description states 'Get knowledge graph health — entity/triple counts, predicate distribution, temporal coverage.' The verb 'Get' and the nature of the metrics (counts, distribution, coverage) indicate pure data retrieval with no modifications or side…
Attacks that exploit this kind of access
[DEPRECATED] Get knowledge graph health — entity/triple counts, predicate distribution, temporal coverage. It is categorised as a Read tool in the Memento MCP Server, which means it retrieves data without modifying state.
Register the Memento MCP server in PolicyLayer and add a rule for memento_kg_health: 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 Memento. Nothing to install.
memento_kg_health 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 memento_kg_health 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 memento_kg_health. 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.
memento_kg_health is provided by the Memento MCP server (joyciakira/memento). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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