List SharePoint sites accessible to the user. Returns site IDs needed for sp_list_drives. Use this when the user wants to browse a specific site, NOT when searching for document content (use sp_search_read instead).
AI agents call sp_list_sites to retrieve information from M365 without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query operation that retrieves metadata (site IDs and site information) from SharePoint. It has no side effects, does not modify data, and serves as an informational lookup to support navigation. While the returned site IDs may provide access to sensitive organizational structures, the tool itself is strictly read-only.
From the tool's definition Tool 'sp_list_sites' lists SharePoint sites accessible to the user and returns site IDs. The description explicitly states it is for browsing, not searching for document content.
Attacks that exploit this kind of access
List SharePoint sites accessible to the user. Returns site IDs needed for sp_list_drives. Use this when the user wants to browse a specific site, NOT when searching for document content (use sp_search_read instead). It is categorised as a Read tool in the M365 MCP Server, which means it retrieves data without modifying state.
Register the M365 MCP server in PolicyLayer and add a rule for sp_list_sites: 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. Nothing to install.
sp_list_sites 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 sp_list_sites 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 sp_list_sites. 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.
sp_list_sites is provided by the M365 MCP server (swamirama/m365-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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