This record as markdown: /tools/io-github-portel-dev-ncp/get-users.md
What get_users does on Ncp
AI agents call get_users to retrieve information from Ncp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why get_users is rated Low
This tool retrieves user data from Auth0 without side effects. It is a read-only operation that lists existing users. While user data may be sensitive, the tool itself performs no destructive, write, execute, or financial operations. The severity is low because listing users is a common and non-disruptive query, though confidence is high given the clear read-only nature.
From the tool's definition Tool name is 'get_users' and description states 'List Auth0 users'. This performs a straightforward query/retrieval operation with no modification, deletion, or execution of external commands.
Attacks that exploit this kind of access
The rule that runs get_users safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Ncp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For get_users, this is the rule to start with:
get_users is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Ncp, apply this rule, and every get_users call is checked against it from then on.
Questions about get_users
List Auth0 users. It is categorised as a Read tool in the Ncp MCP Server, which means it retrieves data without modifying state.
Register the Ncp MCP server in PolicyLayer and add a rule for get_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 Ncp. Nothing to install.
get_users 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 get_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.
Set action: deny in the PolicyLayer policy for get_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.
get_users is provided by the Ncp MCP server (@portel/ncp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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