add_rpc_method

SERVERSbox SOURCEsbox-mcp-server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/sbox/add-rpc-method.md

WHAT IT DOES

What add_rpc_method does on Sbox

AI agents use add_rpc_method to create or update resources in Sbox, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Sbox environment.

RISK

Why add_rpc_method is rated Medium

This tool writes/modifies C# script files by inserting RPC method stubs and attributes. It creates or modifies source code in a reversible way (code can be removed or edited). While it generates code, it doesn't execute it — it only inserts a stub with an empty body into a script file, making Write the appropriate category.

From the tool's definition Generate an RPC method stub in a C# script. Inserts the chosen RPC attribute... above a method with an empty body.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_rpc_method safely

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

add_rpc_method Rate-limited

add_rpc_method 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.

View as policy code

policy.json

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

LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about add_rpc_method

What does the add_rpc_method tool do? +

Generate an RPC method stub in a C# script. Inserts the chosen RPC attribute ([Rpc.Broadcast] all clients, [Rpc.Host] host only, [Rpc.Owner] owner only) above a method with an empty body. Pass methodParams to give it a parameter list (e.g. It is categorised as a Write tool in the Sbox MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_rpc_method? +

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

What risk level is add_rpc_method? +

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

Can I rate-limit add_rpc_method? +

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

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

add_rpc_method is provided by the Sbox MCP server (sbox-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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