AI agents call cert_check to retrieve information from Git Steer without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs inspection and retrieval of certificate expiration status from cert-manager resources. It has no side effects—it does not create, modify, delete, or execute operations. The action is purely informational (read-only query). Severity is low because misuse would only surface stale or incorrect certificate data, not compromise systems directly.
From the tool's definition Tool "checks cert-manager Certificate resources and returns certificates" — uses detection/query language ("Detect", "Checks", "returns") with no modification, deletion, or execution of external systems.
Attacks that exploit this kind of access
Detect TLS certificates approaching expiration in the cluster. Checks cert-manager Certificate resources and returns certificates expiring within the threshold. It is categorised as a Read tool in the Git Steer MCP Server, which means it retrieves data without modifying state.
Register the Git Steer MCP server in PolicyLayer and add a rule for cert_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 Git Steer. Nothing to install.
cert_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 cert_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 cert_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.
cert_check is provided by the Git Steer MCP server (ry-ops/git-steer). 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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