AI agents call m365_chat to retrieve information from M365 Copilot without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears to be a chat/query interface for Microsoft 365 data based on context from sibling tools and server capabilities. No modification, deletion, execution, or financial operations are indicated. The primary function is querying enterprise data (Read category).
From the tool's definition Tool name 'm365_chat' with description empty; sibling tools include 'm365_search', 'm365_retrieve', and 'm365_chat_with_files', all indicating data retrieval operations.
Documented attack patterns abuse exactly the kind of access m365_chat gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and M365 Copilot, and nothing reaches the server without passing your rules. This is the rule we recommend for m365_chat:
{
"version": "1",
"default": "deny",
"tools": {
"m365_chat": {}
}
}m365_chat is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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m365_chat. It is categorised as a Read tool in the M365 Copilot MCP Server, which means it retrieves data without modifying state.
Register the M365 Copilot MCP server in PolicyLayer and add a rule for m365_chat: 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 M365 Copilot. Nothing to install.
m365_chat 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 m365_chat 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 m365_chat. 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.
m365_chat is provided by the M365 Copilot MCP server (renepajta/m365-copilot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from M365 Copilot, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 M365 Copilot tools catalogued and risk-classified — across an index of 43,000+ MCP servers.