AI agents call open_memories to retrieve information from Mnemex without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name 'open_memories' implies reading or accessing stored memories, consistent with the server's memory management theme. However, the description is empty, so the exact behavior is unknown. Based on naming convention and sibling tools context (read_graph, observe_memory_usage suggest read operations), this is likely a Read operation. Confidence is low due to the empty description.
From the tool's definition Tool name 'open_memories' with empty description; name suggests retrieving or listing memory entries
Documented attack patterns abuse exactly the kind of access open_memories gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mnemex, and nothing reaches the server without passing your rules. This is the rule we recommend for open_memories:
{
"version": "1",
"default": "deny",
"tools": {
"open_memories": {}
}
}open_memories is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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open_memories. It is categorised as a Read tool in the Mnemex MCP Server, which means it retrieves data without modifying state.
Register the Mnemex MCP server in PolicyLayer and add a rule for open_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 Mnemex. Nothing to install.
open_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 open_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 open_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.
open_memories is provided by the Mnemex MCP server (prefrontal-systems/cortexgraph). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 13 Mnemex tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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13 Mnemex tools catalogued and risk-classified — across an index of 42,500+ MCP servers.