AI agents call list_ros2_nodes to retrieve information from ROS MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays information about active ROS 2 nodes without creating, modifying, deleting, or executing any operations. It is a straightforward informational query with no capability to affect system state or trigger external actions.
From the tool's definition Tool name is 'list_ros2_nodes' and description states it 'Lists currently running ROS 2 nodes.' The verb 'lists' and the read-only nature of querying node status indicate no modifications or side effects.
Documented attack patterns abuse exactly the kind of access list_ros2_nodes gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and ROS MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for list_ros2_nodes:
{
"version": "1",
"default": "deny",
"tools": {
"list_ros2_nodes": {}
}
}list_ros2_nodes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Lists currently running ROS 2 nodes. It is categorised as a Read tool in the ROS MCP MCP Server, which means it retrieves data without modifying state.
Register the ROS MCP server in PolicyLayer and add a rule for list_ros2_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 ROS MCP. Nothing to install.
list_ros2_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_ros2_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_ros2_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_ros2_nodes is provided by the ROS MCP server (yutarop/ros-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 24 ROS MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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24 ROS MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.