AI agents call entity_disambiguate to retrieve information from Mementos without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool searches for and retrieves candidate duplicate entities using trigram-based similarity comparison. It has no side effects—it does not create, modify, delete, or execute anything. The operation is purely informational, allowing inspection of potential duplicates for human decision-making. This is a classic Read category operation (search/query pattern).
From the tool's definition Tool 'entity_disambiguate' performs name similarity matching and returns pairs of potential duplicates. The verb 'find' combined with 'returns' indicates a query operation that retrieves and surfaces data without modifying, deleting, or executing external…
Attacks that exploit this kind of access
Find potential duplicate entities by name similarity (trigram). Returns pairs above the threshold within same type+project. It is categorised as a Read tool in the Mementos MCP Server, which means it retrieves data without modifying state.
Register the Mementos MCP server in PolicyLayer and add a rule for entity_disambiguate: 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 Mementos. Nothing to install.
entity_disambiguate 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 entity_disambiguate 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 entity_disambiguate. 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.
entity_disambiguate is provided by the Mementos MCP server (@hasna/mementos). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
entity_disambiguate is one line of Mementos's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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