AI agents call memory_open_nodes to retrieve information from VaultAssist without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool opens and retrieves specific nodes, which is a read/fetch operation with no apparent side effects. The description is truncated ('in the user' appears incomplete), which slightly lowers confidence, but 'retrieve' strongly implies a read-only operation. Severity is low as it reads internal memory/knowledge graph nodes rather than sensitive external data.
From the tool's definition 'Open and retrieve specific nodes' — retrieves data from memory/knowledge graph nodes
Documented attack patterns abuse exactly the kind of access memory_open_nodes gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and VaultAssist, and nothing reaches the server without passing your rules. This is the rule we recommend for memory_open_nodes:
{
"version": "1",
"default": "deny",
"tools": {
"memory_open_nodes": {}
}
}memory_open_nodes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Open and retrieve specific nodes in the user. It is categorised as a Read tool in the VaultAssist MCP Server, which means it retrieves data without modifying state.
Register the VaultAssist MCP server in PolicyLayer and add a rule for memory_open_nodes: 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 VaultAssist. Nothing to install.
memory_open_nodes 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_open_nodes 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_open_nodes. 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_open_nodes is provided by the VaultAssist MCP server (3xcaffeine/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from VaultAssist, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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79 VaultAssist tools catalogued and risk-classified — across an index of 43,000+ MCP servers.