regex_build_pattern

Build a regular expression pattern from a natural language description

SERVERPlugin Hub SOURCE@barnburner121/plugin-hub-mcp

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/barnburner121-plugin-hub-mcp/regex-build-pattern.md

WHAT IT DOES

What regex_build_pattern does on Plugin Hub

AI agents invoke regex_build_pattern to trigger actions in Plugin Hub. 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.

RISK

Why regex_build_pattern is rated High

regex_build_pattern triggers real processes with real consequences. An agent gone sideways doesn't fire it once. It starts dozens of builds, sends mass notifications, or burns through compute before anyone looks up.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs regex_build_pattern safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Plugin Hub, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For regex_build_pattern, this is the rule to start with:

regex_build_pattern Rate-limited

regex_build_pattern 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": {
    "regex_build_pattern": {
      "limits": [
        {
          "counter": "regex_build_pattern_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Plugin Hub, apply this rule, and every regex_build_pattern call is checked against it from then on.

FAQ

Questions about regex_build_pattern

What does the regex_build_pattern tool do? +

Build a regular expression pattern from a natural language description. It is categorised as a Execute tool in the Plugin Hub MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on regex_build_pattern? +

Register the Plugin Hub MCP server in PolicyLayer and add a rule for regex_build_pattern: 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 Plugin Hub. Nothing to install.

What risk level is regex_build_pattern? +

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

Can I rate-limit regex_build_pattern? +

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

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

regex_build_pattern is provided by the Plugin Hub MCP server (@barnburner121/plugin-hub-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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