ms365_list_emails
AI agents call ms365_list_emails to retrieve information from Microsoft 365 MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Listing emails is a read-only operation that retrieves existing data without creating, modifying, deleting, or executing actions. It has no blast radius beyond information disclosure. Confidence is slightly reduced (0.85 rather than 0.95) due to the empty tool description, though context from sibling tools and the server description provides strong supporting evidence.
From the tool's definition Tool name 'ms365_list_emails' combined with server description stating it 'enables users to manage emails, search folders, schedule calendar events' and sibling tools like 'ms365_read_email' and 'ms365_search_emails' indicate this retrieves/queries email data.
Attacks that exploit this kind of access
ms365_list_emails. It is categorised as a Read tool in the Microsoft 365 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Microsoft 365 MCP Server MCP server in PolicyLayer and add a rule for ms365_list_emails: 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 MCP Server. Nothing to install.
ms365_list_emails 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 ms365_list_emails 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 ms365_list_emails. 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.
ms365_list_emails is provided by the Microsoft 365 MCP Server MCP server (ronaldzuniga/ms365-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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