List active (non-bot, non-deleted) users in the Slack workspace. When name filter is provided, auto-paginates across up to 5 pages to find matches. For exact email match, prefer lookup_user_by_email.
AI agents call list_slack_users to retrieve information from Apple Shortcuts without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries user information from Slack with no capability to modify, delete, or execute actions. It is purely informational (list/fetch pattern). Severity is low because user directory information is typically non-sensitive metadata, though confidence is not absolute (0.95) due to the possibility that user listings could expose internal organizational structure in some security contexts.
From the tool's definition Tool description states it "List[s] active (non-bot, non-deleted) users in the Slack workspace" with optional filtering and pagination. This is a read-only query operation with no data modification or side effects.
Documented attack patterns abuse exactly the kind of access list_slack_users gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Apple Shortcuts, and nothing reaches the server without passing your rules. This is the rule we recommend for list_slack_users:
{
"version": "1",
"default": "deny",
"tools": {
"list_slack_users": {}
}
}list_slack_users is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List active (non-bot, non-deleted) users in the Slack workspace. When name filter is provided, auto-paginates across up to 5 pages to find matches. For exact email match, prefer lookup_user_by_email. It is categorised as a Read tool in the Apple Shortcuts MCP Server, which means it retrieves data without modifying state.
Register the Apple Shortcuts MCP server in PolicyLayer and add a rule for list_slack_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 Apple Shortcuts. Nothing to install.
list_slack_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 list_slack_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 list_slack_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.
list_slack_users is provided by the Apple Shortcuts MCP server (@mindstone/mcp-server-apple-shortcuts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Apple Shortcuts, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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423 Apple Shortcuts tools catalogued and risk-classified — across an index of 43,000+ MCP servers.