Check server health and return status information.
AI agents call health_check to retrieve information from Trellis MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Health checks are diagnostic operations that query and return system status information. They have no side effects, do not modify data, and do not execute code or operations. This is a canonical Read operation with minimal risk—misuse would only retrieve operational status information.
From the tool's definition Tool name 'health_check' and description 'Check server health and return status information' indicate a query operation that retrieves status data without modifying state or triggering external operations.
Attacks that exploit this kind of access
Check server health and return status information. It is categorised as a Read tool in the Trellis MCP MCP Server, which means it retrieves data without modifying state.
Register the Trellis 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 Trellis MCP. 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 Trellis MCP server (langadventurellc/trellis-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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