uploadFile · OpenAI Web Search MCP Server MCP: Risk & Policy

WHAT IT DOES

What uploadFile does on OpenAI Web Search MCP Server

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

WHY IT NEEDS A POLICY

Why uploadFile needs a policy

Uploading a file to a platform creates or modifies data in a reversible manner. While the operation has persistence, it is not destructive (data is not deleted or irreversibly lost), not financial, and not code execution.

From the tool's definition Tool description explicitly states 'Uploads a single file', which is a create/modify operation that stores data on the Gumloop platform. The sibling tools (uploadMultipleFiles, downloadFile, downloadMultipleFiles) confirm this is a file storage service.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

uploadFile Rate-limited

uploadFile 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": {
    "uploadFile": {
      "limits": [
        {
          "counter": "uploadfile_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about uploadFile

What does the uploadFile tool do? +

Uploads a single file to the Gumloop platform. It is categorised as a Write tool in the OpenAI Web Search 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 uploadFile? +

Register the OpenAI Web Search MCP Server MCP server in PolicyLayer and add a rule for uploadFile: 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 OpenAI Web Search MCP Server. Nothing to install.

What risk level is uploadFile? +

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

Can I rate-limit uploadFile? +

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

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

uploadFile is provided by the OpenAI Web Search MCP Server MCP server (tiovikram/gumloop-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.