cert_check_bulk
Check TLS certificates for multiple hosts in one call. hosts: comma-separated hostnames (max 20). Returns expiry, days remaining, issuer, SANs, and validity for each. Useful for monitoring certificate renewals across many domains at once.
This record as markdown: /tools/aaronckj-mcp-nettools/cert-check-bulk.md
What cert_check_bulk does on Mcp Nettools
AI agents call cert_check_bulk to retrieve information from Mcp Nettools without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why cert_check_bulk is rated Low
cert_check_bulk is a diagnostic tool that performs passive information retrieval about SSL/TLS certificates. It gathers certificate metadata for monitoring purposes but does not modify, execute, or destroy anything. The blast radius of misuse is minimal — an agent might check certificates for hosts it shouldn't access, but this is an informational read with no downstream impact.
From the tool's definition The tool retrieves and queries TLS certificate information (expiry, days remaining, issuer, SANs, validity) for multiple hosts. The description uses query verbs: 'Check', 'Returns', and 'monitoring' — all read operations with no side effects.
Attacks that exploit this kind of access
The rule that runs cert_check_bulk safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Nettools, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For cert_check_bulk, this is the rule to start with:
cert_check_bulk is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Nettools, apply this rule, and every cert_check_bulk call is checked against it from then on.
Questions about cert_check_bulk
Check TLS certificates for multiple hosts in one call. hosts: comma-separated hostnames (max 20). Returns expiry, days remaining, issuer, SANs, and validity for each. Useful for monitoring certificate renewals across many domains at once. It is categorised as a Read tool in the Mcp Nettools MCP Server, which means it retrieves data without modifying state.
Register the Mcp Nettools MCP server in PolicyLayer and add a rule for cert_check_bulk: 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 Nettools. Nothing to install.
cert_check_bulk 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_bulk 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_bulk. 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_bulk is provided by the Mcp Nettools MCP server (aaronckj/mcp-nettools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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