Get the current signed-in user
AI agents call whoami to retrieve information from M365connector without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves the identity of the currently authenticated user—a read-only query operation. It has no destructive, financial, or execution implications. The blast radius of misuse is minimal, as an agent simply learning who is logged in poses low risk. Severity is low because identity information alone (without further action) is not highly sensitive in this context.
From the tool's definition Tool name 'whoami' and description 'Get the current signed-in user' indicate retrieval of identity information with no data modification or side effects.
Attacks that exploit this kind of access
Get the current signed-in user. It is categorised as a Read tool in the M365connector MCP Server, which means it retrieves data without modifying state.
Register the M365connector MCP server in PolicyLayer and add a rule for whoami: 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 M365connector. Nothing to install.
whoami 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 whoami 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 whoami. 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.
whoami is provided by the M365connector MCP server (m365connector). 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.
Teams ship this data inside their own products. See what a licence covers →