Get the authenticated upload endpoint URL and curl command for uploading files to SharePoint/OneDrive. Call this tool first, then execute the returned curl command (POST with --data-binary) to upload. This bypasses MCP protocol limits and handles files up to 250MB.
AI agents call get_upload_config to retrieve information from Microsoft Graph MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Despite being part of an upload workflow, this specific tool only reads and returns configuration data (an endpoint URL and a curl command string). The actual file upload is performed by a separate step (executing the returned curl command). By itself, this tool has no side effects beyond returning information, placing it in the Read category.
From the tool's definition 'Get the authenticated upload endpoint URL and curl command for uploading files' — the tool itself only retrieves configuration (URL and curl command); it does not perform the upload itself.
Attacks that exploit this kind of access
Get the authenticated upload endpoint URL and curl command for uploading files to SharePoint/OneDrive. Call this tool first, then execute the returned curl command (POST with --data-binary) to upload. This bypasses MCP protocol limits and handles files up to 250MB. It is categorised as a Read tool in the Microsoft Graph MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Microsoft Graph MCP Server MCP server in PolicyLayer and add a rule for get_upload_config: 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 Microsoft Graph MCP Server. Nothing to install.
get_upload_config is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_upload_config 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.
Set action: deny in the PolicyLayer policy for get_upload_config. 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.
get_upload_config is provided by the Microsoft Graph MCP Server MCP server (sapientsai/microsoft-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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