Find the shortest path between two mementos through relationships
AI agents call find_path_between_mementos to retrieve information from MCP Memento without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves relational information between stored mementos by traversing existing relationships. It performs a read-only graph search operation (finding shortest paths) analogous to querying a knowledge graph. There are no side effects, data modifications, execution of external code, destructive operations, or financial implications.
From the tool's definition Tool name 'find_path_between_mementos' and description 'Find the shortest path between two mementos through relationships' indicate a graph traversal/query operation with no modification, creation, or deletion of data.
Attacks that exploit this kind of access
Find the shortest path between two mementos through relationships. It is categorised as a Read tool in the MCP Memento MCP Server, which means it retrieves data without modifying state.
Register the MCP Memento MCP server in PolicyLayer and add a rule for find_path_between_mementos: 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 MCP Memento. Nothing to install.
find_path_between_mementos 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 find_path_between_mementos 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 find_path_between_mementos. 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.
find_path_between_mementos is provided by the MCP Memento MCP server (x-hannibal/mcp-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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