generate_stylus_code

THE RISK

Medium Risk

Why generate_stylus_code needs a policy

This tool generates source code files (Rust smart contracts) based on user input. It creates new artifacts but does not execute them, deploy them, or delete anything. The primary action is writing/creating code, making Write the appropriate category.

From the tool's definition Generate Stylus (Rust) smart contract code based on a description. Produces production-ready code using stylus-sdk.

Documented attack patterns abuse exactly the kind of access generate_stylus_code gives an agent:

POLICY

How to control generate_stylus_code

PolicyLayer is an MCP gateway — it sits between your AI agents and ARBuilder, and nothing reaches the server without passing your rules. This is the rule we recommend for generate_stylus_code:

policy.json

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

generate_stylus_code 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.

Create a free account and register ARBuilder — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about generate_stylus_code

What does the generate_stylus_code tool do? +

Generate Stylus (Rust) smart contract code based on a description. Produces production-ready code using stylus-sdk. It is categorised as a Write tool in the ARBuilder MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on generate_stylus_code? +

Register the ARBuilder MCP server in PolicyLayer and add a rule for generate_stylus_code: 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 ARBuilder. Nothing to install.

What risk level is generate_stylus_code? +

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

Can I rate-limit generate_stylus_code? +

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

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

generate_stylus_code is provided by the ARBuilder MCP server (quantum3-labs/arbuilder). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every ARBuilder tool call.

Start from ARBuilder, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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