testssl · PenTest MCP Server MCP: Risk & Policy

WHAT IT DOES

What testssl does on PenTest MCP Server

AI agents invoke testssl to trigger actions in PenTest MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why testssl needs a policy

This tool executes active network-based security probing against external targets. While it is read-like in that it gathers TLS/SSL configuration data, it actively sends crafted packets and connections to a target system without its consent in a pentesting context.

From the tool's definition TLS/SSL security testing — runs testssl.sh or equivalent tool against a target host to probe SSL/TLS configurations, certificates, and vulnerabilities

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

testssl Rate-limited

testssl stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "testssl": {
      "limits": [
        {
          "counter": "testssl_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about testssl

What does the testssl tool do? +

TLS/SSL security testing. It is categorised as a Execute tool in the PenTest MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on testssl? +

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

What risk level is testssl? +

testssl is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit testssl? +

Yes. Add a rate_limit block to the testssl 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 testssl completely? +

Set action: deny in the PolicyLayer policy for testssl. 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 testssl? +

testssl is provided by the PenTest MCP Server MCP server (mohitsahoo/mcptoolforwebvulnerabilities-). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.