AI agents call read_target_voltage to retrieve information from Pymcuprog without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves diagnostic information (voltage measurement) from the debugger hardware without modifying, executing, or deleting anything. It is a non-destructive query operation with minimal blast radius—an AI agent misusing it could only waste resources or gather unnecessary telemetry.
From the tool's definition Tool name 'read_target_voltage' and description 'Read the voltage on the target VCC pin as measured by the debugger' indicate a pure data retrieval operation with no side effects.
Attacks that exploit this kind of access
Read the voltage on the target VCC pin as measured by the debugger. It is categorised as a Read tool in the Pymcuprog MCP Server, which means it retrieves data without modifying state.
Register the Pymcuprog MCP server in PolicyLayer and add a rule for read_target_voltage: 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 Pymcuprog. Nothing to install.
read_target_voltage 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 read_target_voltage 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 read_target_voltage. 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.
read_target_voltage is provided by the Pymcuprog MCP server (lucasgerads/pymcuprog-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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