Show the definition of a ROS message type.
AI agents call ros_show_msg to retrieve information from ROS1 Noetic MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about ROS message type definitions. It performs no side effects, creates no modifications, executes no commands, and deletes nothing. It is purely informational—analogous to inspecting a data schema. The blast radius of misuse is minimal; an LLM could at worst request definitions repeatedly or for non-existent types, neither of which causes harm to the robotic system.
From the tool's definition Tool name 'ros_show_msg' and description 'Show the definition of a ROS message type' indicate a query operation that retrieves and displays message type definitions without modifying any data or triggering actions.
Attacks that exploit this kind of access
Show the definition of a ROS message type. It is categorised as a Read tool in the ROS1 Noetic MCP Server MCP Server, which means it retrieves data without modifying state.
Register the ROS1 Noetic MCP Server MCP server in PolicyLayer and add a rule for ros_show_msg: 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 ROS1 Noetic MCP Server. Nothing to install.
ros_show_msg 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 ros_show_msg 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 ros_show_msg. 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.
ros_show_msg is provided by the ROS1 Noetic MCP Server MCP server (lopisan/ros-mcp). 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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