notion_list_users

THE RISK

Low Risk

Why notion_list_users needs a policy

Listing users is a read-only query operation that retrieves information without creating, modifying, or deleting any data. It has minimal blast radius even if misused, as it only exposes user information already accessible to authenticated workspace members. Low severity due to the informational nature of the data returned.

From the tool's definition Tool name is 'notion_list_users' and description states 'List all users in a Notion workspace' — a retrieval operation with no modification or side effects.

Risk signalsBulk/mass operation — affects multiple targets

Documented attack patterns abuse exactly the kind of access notion_list_users gives an agent:

POLICY

How to control notion_list_users

PolicyLayer is an MCP gateway — it sits between your AI agents and Notion MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for notion_list_users:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "notion_list_users": {}
  }
}

notion_list_users is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Notion MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about notion_list_users

What does the notion_list_users tool do? +

List all users in a Notion workspace. It is categorised as a Read tool in the Notion MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on notion_list_users? +

Register the Notion MCP Server MCP server in PolicyLayer and add a rule for notion_list_users: 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 Notion MCP Server. Nothing to install.

What risk level is notion_list_users? +

notion_list_users is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit notion_list_users? +

Yes. Add a rate_limit block to the notion_list_users 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.

How do I block notion_list_users completely? +

Set action: deny in the PolicyLayer policy for notion_list_users. 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.

What MCP server provides notion_list_users? +

notion_list_users is provided by the Notion MCP Server MCP server (orbit-logistics/notion-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Notion MCP Server tool call.

Start from Notion MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →