test-regex · Underground Cultural District MCP Server MCP

WHAT IT DOES

What test-regex does on Underground Cultural District MCP Server

AI agents invoke test-regex to trigger actions in Underground Cultural District 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 test-regex needs a policy

Executing regex patterns against arbitrary input constitutes running a computation/pattern-matching operation. While typically low-risk, regex execution can be exploited via ReDoS (Regular Expression Denial of Service) attacks with crafted patterns causing catastrophic backtracking, making it an Execute-category tool with medium severity.

From the tool's definition Test regex patterns against text

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

test-regex Rate-limited

test-regex 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": {
    "test-regex": {
      "limits": [
        {
          "counter": "test-regex_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 Underground Cultural District MCP Server, so you can run agents against it safely.

FAQ

Questions about test-regex

What does the test-regex tool do? +

Test regex patterns against text. It is categorised as a Execute tool in the Underground Cultural District 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 test-regex? +

Register the Underground Cultural District MCP Server MCP server in PolicyLayer and add a rule for test-regex: 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 Underground Cultural District MCP Server. Nothing to install.

What risk level is test-regex? +

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

Can I rate-limit test-regex? +

Yes. Add a rate_limit block to the test-regex 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 test-regex completely? +

Set action: deny in the PolicyLayer policy for test-regex. 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 test-regex? +

test-regex is provided by the Underground Cultural District MCP Server MCP server (lisamaraventano-spine/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.