add_sync_property

Annotate an EXISTING public property in a C# script with the [Sync] attribute so s&box replicates it across the network. This does NOT create a new property — the property named by

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-sync-property.md

WHAT IT DOES

What add_sync_property does on Sbox

AI agents use add_sync_property 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_sync_property is rated Medium

This tool modifies existing code by adding a network replication attribute to a property. It is a reversible code annotation (the attribute can be removed), not destructive deletion.

From the tool's definition Tool description states it will 'Annotate an EXISTING public property in a C# script with the [Sync] attribute' — this modifies a property's attributes/metadata in an existing script.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_sync_property 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_sync_property, this is the rule to start with:

add_sync_property Rate-limited

add_sync_property 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_sync_property": {
      "limits": [
        {
          "counter": "add_sync_property_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_sync_property call is checked against it from then on.

FAQ

Questions about add_sync_property

What does the add_sync_property tool do? +

Annotate an EXISTING public property in a C# script with the [Sync] attribute so s&box replicates it across the network. This does NOT create a new property — the property named by. 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_sync_property? +

Register the Sbox MCP server in PolicyLayer and add a rule for add_sync_property: 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_sync_property? +

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

Can I rate-limit add_sync_property? +

Yes. Add a rate_limit block to the add_sync_property 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_sync_property completely? +

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

add_sync_property 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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