steam_uploadWorkshopItem · Steam MCP Server MCP

WHAT IT DOES

What steam_uploadWorkshopItem does on Steam MCP Server

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

WHY IT NEEDS A POLICY

Why steam_uploadWorkshopItem needs a policy

This tool facilitates creation and upload of Workshop items, which is reversible (items can be removed/unpublished). It does not execute arbitrary code on the user's system — it provides code examples and documentation for the Steamworks SDK upload process.

From the tool's definition Tool name 'steam_uploadWorkshopItem' and description explicitly states 'uploading new Steam Workshop items' — a create/modify operation that adds user-generated content to Steam's Workshop platform.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

steam_uploadWorkshopItem Rate-limited

steam_uploadWorkshopItem 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": {
    "steam_uploadWorkshopItem": {
      "limits": [
        {
          "counter": "steam_uploadworkshopitem_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Steam MCP Server, so you can run agents against it safely.

FAQ

Questions about steam_uploadWorkshopItem

What does the steam_uploadWorkshopItem tool do? +

Get code examples and documentation for uploading new Steam Workshop items. Workshop uploads require the Steamworks SDK (ISteamUGC) running in a client or dedicated tool — there is no HTTP upload endpoint. This tool returns ready-to-use code for C++, C#, and GDScript. It is categorised as a Write tool in the Steam MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on steam_uploadWorkshopItem? +

Register the Steam MCP Server MCP server in PolicyLayer and add a rule for steam_uploadWorkshopItem: 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 Steam MCP Server. Nothing to install.

What risk level is steam_uploadWorkshopItem? +

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

Can I rate-limit steam_uploadWorkshopItem? +

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

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

steam_uploadWorkshopItem is provided by the Steam MCP Server MCP server (tmhsdigital/steam-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.