Return retained device topics and optional metadata for one JouleScope.
AI agents call device_info to retrieve information from Joulescope without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about a connected JouleScope device. It performs a query operation to get device metadata without creating, modifying, deleting, or executing any operations. The blast radius of misuse is minimal—an agent could only view device information that is already accessible, posing no security risk to data integrity or system state.
From the tool's definition Tool returns device topics and metadata for a JouleScope device. The description uses 'Return' which indicates a read-only retrieval operation with no side effects. No modification, deletion, or external action is triggered.
Attacks that exploit this kind of access
Return retained device topics and optional metadata for one JouleScope. It is categorised as a Read tool in the Joulescope MCP Server, which means it retrieves data without modifying state.
Register the Joulescope MCP server in PolicyLayer and add a rule for device_info: 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 Joulescope. Nothing to install.
device_info 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 device_info 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 device_info. 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.
device_info is provided by the Joulescope MCP server (juanqui/joulescope-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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