Use this when ChatGPT needs to confirm the MCP service is reachable.
AI agents call health.check to retrieve information from GPT MCP Service without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a liveness/availability check of the MCP service. It retrieves status information without modifying any data, executing code, or triggering external operations. It is a read-only diagnostic operation, placing it in the Read category with low severity since misuse poses minimal risk.
From the tool's definition Tool name 'health.check' and description 'confirm the MCP service is reachable' indicate a simple status probe with no side effects or data modification.
Attacks that exploit this kind of access
Use this when ChatGPT needs to confirm the MCP service is reachable. It is categorised as a Read tool in the GPT MCP Service MCP Server, which means it retrieves data without modifying state.
Register the GPT MCP Service 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 GPT MCP Service. 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 GPT MCP Service MCP server (jmillpps/encore-mcp-base). 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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