upload-file-content

SERVERMs 365 SOURCE@jo3zik/ms-365-mcp-server

Medium RISK CLASS

Category Write

Parameters 63 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/jo3zik-ms-365-mcp-server/upload-file-content.md

WHAT IT DOES

What upload-file-content does on Ms 365

AI agents use upload-file-content to create or update resources in Ms 365, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ms 365 environment.

Parameter	Type	Required	Description
`body`	string	Yes	Base64-encoded file content. The server decodes it and PUTs the raw bytes to Microsoft Graph.
`confirm`	boolean	—	For destructive operations when the confirm gate is enabled (MS365_MCP_REQUIRE_CONFIRM=true; off by default). Set to true only after the user has explicitly app
`driveId`	string	Yes	Value for the 'driveId' path segment. Pass it under the name 'driveId', not as 'id'. Use the 'id' field of the drive object as returned by Microsoft Graph.
`driveItemId`	string	Yes	Value for the 'driveItemId' path segment. Pass it under the name 'driveItemId', not as 'id'. Use the 'id' field of the drive item object as returned by Microsof
`includeHeaders`	boolean	—	Include response headers (including ETag) in the response metadata
`excludeResponse`	boolean	—	Exclude the full response body and only return success or failure indication

Parameters from the server's own tool schema.

RISK

Why upload-file-content is rated Medium

An AI agent can call upload-file-content faster than any human can review: one bad instruction and it creates or modifies resources in Ms 365 by the hundred, each call as confident as the last.

Risk signalsAccepts raw HTML/template content (body) · Admin/system-level operation

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs upload-file-content safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Ms 365, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For upload-file-content, this is the rule to start with:

upload-file-content Rate-limited

upload-file-content 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-file-content": {
      "limits": [
        {
          "counter": "upload-file-content_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 Ms 365, apply this rule, and every upload-file-content call is checked against it from then on.

FAQ

Questions about upload-file-content

What does the upload-file-content tool do? +

The content stream, if the item represents a file. 💡 TIP: Body is a base64-encoded string of the file bytes; the server decodes it before PUT. Graph accepts up to 250MB here, but the whole string travels as a tool argument and a truncated one decodes to a truncated file with no error, so use create-upload-session rather than emitting a large base64 string. For new files use path format: /items/root:/path/to/file.txt:/content. Overwrites existing files without warning. It is categorised as a Write tool in the Ms 365 MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does upload-file-content accept? +

upload-file-content accepts 6 parameters: body, confirm, driveId, driveItemId, includeHeaders, excludeResponse. Required: body, driveId, driveItemId. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on upload-file-content? +

Register the Ms 365 MCP server in PolicyLayer and add a rule for upload-file-content: 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 Ms 365. Nothing to install.

What risk level is upload-file-content? +

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

Can I rate-limit upload-file-content? +

Yes. Add a rate_limit block to the upload-file-content 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-file-content completely? +

Set action: deny in the PolicyLayer policy for upload-file-content. 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-file-content? +

upload-file-content is provided by the Ms 365 MCP server (@jo3zik/ms-365-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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write_file on 0sec → The MCP Attack Database →

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