certs_upload · CyPerf MCP Server MCP: Risk & Policy

WHAT IT DOES

What certs_upload does on CyPerf MCP Server

AI agents use certs_upload to create or update resources in CyPerf MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your CyPerf MCP Server environment.

WHY IT NEEDS A POLICY

Why certs_upload needs a policy

This tool uploads certificates to a certificate manager, which creates or modifies stored certificate data. While the operation is reversible (certificates can be deleted or replaced), it affects system security configuration and could enable man-in-the-middle attacks or unauthorized TLS termination if malicious certificates are uploaded.

From the tool's definition Tool name 'certs_upload' and description 'Upload a certificate to the cert manager' indicate a create/modify operation that adds data to a system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

certs_upload Rate-limited

certs_upload stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "certs_upload": {
      "limits": [
        {
          "counter": "certs_upload_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches CyPerf MCP Server, so you can run agents against it safely.

FAQ

Questions about certs_upload

What does the certs_upload tool do? +

[Certificates] Upload a certificate to the cert manager. It is categorised as a Write tool in the CyPerf MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on certs_upload? +

Register the CyPerf MCP Server MCP server in PolicyLayer and add a rule for certs_upload: 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 CyPerf MCP Server. Nothing to install.

What risk level is certs_upload? +

certs_upload is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit certs_upload? +

Yes. Add a rate_limit block to the certs_upload 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.

How do I block certs_upload completely? +

Set action: deny in the PolicyLayer policy for certs_upload. 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.

What MCP server provides certs_upload? +

certs_upload is provided by the CyPerf MCP Server MCP server (keysight/cyperf-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.