health_check
AI agents call health_check to retrieve information from MCP PyBoy Emulator Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Health checks are non-destructive read operations that verify system status. Even without a description, the naming convention and server context strongly indicate this is a monitoring/diagnostic read rather than an action that modifies, executes, or deletes anything. Low severity because reporting server health poses minimal risk even if misused.
From the tool's definition Tool name 'health_check' with empty description suggests a diagnostic or status query operation. Given the server context of an emulator, this likely retrieves the status of the PyBoy emulation server or session without modifying state.
Attacks that exploit this kind of access
health_check. It is categorised as a Read tool in the MCP PyBoy Emulator Server MCP Server, which means it retrieves data without modifying state.
Register the MCP PyBoy Emulator Server MCP server in PolicyLayer and add a rule for health_check: 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 MCP PyBoy Emulator Server. Nothing to install.
health_check 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 health_check 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 health_check. 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.
health_check is provided by the MCP PyBoy Emulator Server MCP server (ssimonitch/mcp-pyboy). 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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