Manage OAuth 2.0 authorization for user-delegated access to OneDrive and SharePoint files with secure token handling.
AI agents invoke oauth_authorize to trigger actions in Microsoft 365 Core MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool initiates and manages OAuth 2.0 authorization flows, which involves triggering external authentication operations, obtaining and storing access tokens, and establishing delegated permissions over OneDrive and SharePoint. This is not merely reading data — it actively executes an authorization process that grants ongoing access rights.
From the tool's definition 'Manage OAuth 2.0 authorization for user-delegated access to OneDrive and SharePoint files with secure token handling'
Attacks that exploit this kind of access
Manage OAuth 2.0 authorization for user-delegated access to OneDrive and SharePoint files with secure token handling. It is categorised as a Execute tool in the Microsoft 365 Core MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Microsoft 365 Core MCP Server MCP server in PolicyLayer and add a rule for oauth_authorize: 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 365 Core MCP Server. Nothing to install.
oauth_authorize is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the oauth_authorize 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 oauth_authorize. 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.
oauth_authorize is provided by the Microsoft 365 Core MCP Server MCP server (roycedamien/m365-core-mcp). 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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