List all available ROS action servers
AI agents call list_actions to retrieve information from Rosbridge MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs read-only discovery of ROS action servers. It has no side effects, does not modify state, and does not trigger execution of actions or commands. It is analogous to listing available resources in a system. The low severity reflects minimal blast radius — even if misused by an AI agent, it only exposes metadata about available actions without triggering them.
From the tool's definition Tool name is 'list_actions' and description states it 'List all available ROS action servers' — a query operation that retrieves information about available services without modifying or executing anything.
Attacks that exploit this kind of access
List all available ROS action servers. It is categorised as a Read tool in the Rosbridge MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Rosbridge MCP Server MCP server in PolicyLayer and add a rule for list_actions: 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 Rosbridge MCP Server. Nothing to install.
list_actions 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_actions 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_actions. 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_actions is provided by the Rosbridge MCP Server MCP server (takanarishimbo/rosbridge-mcp-server). 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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