List all available devices and their capabilities (properties, actions, events). Use this to discover what you can do.
AI agents call list_devices to retrieve information from Wot without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs device discovery and enumeration, returning metadata about available devices and their properties/actions/events. It has no side effects, does not execute commands, and does not modify any state. It is purely informational, similar to a list or get operation.
From the tool's definition Tool name 'list_devices' and description 'List all available devices and their capabilities' clearly indicate a read-only discovery operation that retrieves information without modifying or controlling any devices.
Documented attack patterns abuse exactly the kind of access list_devices gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Wot, and nothing reaches the server without passing your rules. This is the rule we recommend for list_devices:
{
"version": "1",
"default": "deny",
"tools": {
"list_devices": {}
}
}list_devices is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all available devices and their capabilities (properties, actions, events). Use this to discover what you can do. It is categorised as a Read tool in the Wot MCP Server, which means it retrieves data without modifying state.
Register the Wot MCP server in PolicyLayer and add a rule for list_devices: 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 Wot. Nothing to install.
list_devices 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_devices 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_devices. 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_devices is provided by the Wot MCP server (macc-n/wot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Wot, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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4 Wot tools catalogued and risk-classified — across an index of 43,000+ MCP servers.