AI agents call memory_context_layered 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 queries and retrieves structured memory data without creating, modifying, deleting, or executing operations. It is a data retrieval mechanism that formats existing memory into layered sections for consumption. The sibling tools on this server (entity_delete, bulk_forget, clean_expired) perform mutations, but this tool does not.
From the tool's definition Tool description states it retrieves 'Structured multi-section memory context' with sections like 'Core Facts, Recent History, Relevant Knowledge, Active Decisions' - no modification or deletion operations described.
Attacks that exploit this kind of access
Structured multi-section memory context: Core Facts, Recent History, Relevant Knowledge, Active Decisions. Better than flat lists for agent prompts. 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 memory_context_layered: 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.
memory_context_layered 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 memory_context_layered 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 memory_context_layered. 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.
memory_context_layered 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.
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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