Browse stored memories, optionally filtered by tag. Excludes expired.
AI agents call list_memories to retrieve information from Nexus Core without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and lists stored memories with optional filtering—a pure read operation with no side effects. The action is non-destructive and cannot alter, create, or delete data. Severity is low because disclosure of memories could be sensitive depending on content, but the tool itself performs no harmful operations.
From the tool's definition Tool name 'list_memories' and description 'Browse stored memories, optionally filtered by tag. Excludes expired.' indicate a query/retrieval operation with no modification or deletion of data.
Attacks that exploit this kind of access
Browse stored memories, optionally filtered by tag. Excludes expired. It is categorised as a Read tool in the Nexus Core MCP Server, which means it retrieves data without modifying state.
Register the Nexus Core MCP server in PolicyLayer and add a rule for list_memories: 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 Nexus Core. Nothing to install.
list_memories 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 list_memories 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 list_memories. 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.
list_memories is provided by the Nexus Core MCP server (noumenon-ai/nexus-core). 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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