Manage Microsoft Defender for Office 365 policies including Safe Attachments, Safe Links, anti-phishing, and anti-malware.
AI agents use manage_defender_policies to create or update resources in Microsoft 365 Core MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Microsoft 365 Core MCP Server environment.
This tool creates or modifies security policies reversibly. While it has significant blast radius (misconfigured defender policies could weaken organizational security posture, expose users to threats, or create false positives), it does not delete policies irreversibly, move money, or execute arbitrary code. The Write category is appropriate for policy creation/modification.
From the tool's definition Tool name 'manage_defender_policies' combined with description stating it manages 'Microsoft Defender for Office 365 policies including Safe Attachments, Safe Links, anti-phishing, and anti-malware' indicates creation and modification of security policies.
Attacks that exploit this kind of access
Manage Microsoft Defender for Office 365 policies including Safe Attachments, Safe Links, anti-phishing, and anti-malware. It is categorised as a Write tool in the Microsoft 365 Core MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Microsoft 365 Core MCP Server MCP server in PolicyLayer and add a rule for manage_defender_policies: 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.
manage_defender_policies is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the manage_defender_policies 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 manage_defender_policies. 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.
manage_defender_policies 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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