upload_document · SharePoint MCP Server MCP: Risk & Policy

WHAT IT DOES

What upload_document does on SharePoint MCP Server

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

WHY IT NEEDS A POLICY

Why upload_document needs a policy

This tool creates or adds new documents to SharePoint, fitting the Write category definition of creating or modifying data reversibly. Severity is medium because unauthorized document uploads could introduce malicious content, compromise compliance, or consume storage resources, but the action is reversible through deletion. Confidence is high given the explicit 'upload' language and clear functional scope.

From the tool's definition Tool description states 'Upload a new document to SharePoint' which creates new data in a cloud storage system. The capability to upload both text and binary content demonstrates reversible data creation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

upload_document Rate-limited

upload_document 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": {
    "upload_document": {
      "limits": [
        {
          "counter": "upload_document_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 SharePoint MCP Server, so you can run agents against it safely.

FAQ

Questions about upload_document

What does the upload_document tool do? +

Upload a new document to SharePoint. For text content, provide the content directly. For binary files, provide base64-encoded content. It is categorised as a Write tool in the SharePoint 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 upload_document? +

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

What risk level is upload_document? +

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

Can I rate-limit upload_document? +

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

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

upload_document is provided by the SharePoint MCP Server MCP server (peacockery-studio/sharepoint-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.