yeoman_generate · Mcp Yeoman MCP: Risk & Policy

WHAT IT DOES

What yeoman_generate does on Mcp Yeoman

AI agents invoke yeoman_generate to trigger actions in Mcp Yeoman. 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 yeoman_generate needs a policy

Running a Yeoman generator executes arbitrary code and scripts on the host system, creates and potentially overwrites files, and may install packages. This is an Execute-category action with high severity because a misused generator could scaffold malicious code, overwrite existing project files, or execute post-install hooks with unintended effects.

From the tool's definition "Run a Yeoman generator" — executes a Yeoman generator programmatically, which can create files, modify the filesystem, install dependencies, and trigger arbitrary scaffolding scripts.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

yeoman_generate Rate-limited

yeoman_generate 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": {
    "yeoman_generate": {
      "limits": [
        {
          "counter": "yeoman_generate_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 Mcp Yeoman, so you can run agents against it safely.

FAQ

Questions about yeoman_generate

What does the yeoman_generate tool do? +

Run a Yeoman generator. It is categorised as a Execute tool in the Mcp Yeoman MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on yeoman_generate? +

Register the Mcp Yeoman MCP server in PolicyLayer and add a rule for yeoman_generate: 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 Yeoman. Nothing to install.

What risk level is yeoman_generate? +

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

Can I rate-limit yeoman_generate? +

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

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

yeoman_generate is provided by the Mcp Yeoman MCP server (thirdstrandstudio/mcp-yeoman). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.