AI agents call list_nodes to retrieve information from MCP-Slicer without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name 'list_nodes' clearly indicates data retrieval or querying of nodes in the 3D Slicer scene graph. There is no indication of creation, modification, deletion, or execution of arbitrary code. Despite the empty description lowering confidence somewhat, the semantic meaning of 'list' strongly maps to Read category.
From the tool's definition Tool name 'list_nodes' suggests retrieval/enumeration of scene nodes without modification. No description provided, but naming convention and context as a scene manipulation tool in 3D Slicer indicates query-like behavior.
Documented attack patterns abuse exactly the kind of access list_nodes gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP-Slicer, and nothing reaches the server without passing your rules. This is the rule we recommend for list_nodes:
{
"version": "1",
"default": "deny",
"tools": {
"list_nodes": {}
}
}list_nodes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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list_nodes. It is categorised as a Read tool in the MCP-Slicer MCP Server, which means it retrieves data without modifying state.
Register the MCP-Slicer MCP server in PolicyLayer and add a rule for list_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 MCP-Slicer. Nothing to install.
list_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 list_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 list_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.
list_nodes is provided by the MCP-Slicer MCP server (zhaoyouj/mcp-slicer). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 3 MCP-Slicer tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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3 MCP-Slicer tools catalogued and risk-classified — across an index of 42,500+ MCP servers.