Listar usuários do workspace Slack
AI agents call list_slack_users to retrieve information from Slack MCP Server 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 operation to enumerate users in a Slack workspace. It retrieves data with no side effects, reversible modifications, code execution, or destructive actions. The blast radius is limited—exposure of this tool allows an agent to discover workspace members, which is low-impact compared to Write, Execute, Destructive, or Financial categories. Classified as Read with low severity.
From the tool's definition Tool name 'list_slack_users' and description 'Listar usuários do workspace Slack' (List users of the Slack workspace) indicate a query/list operation that retrieves user information without modifying or deleting data.
Attacks that exploit this kind of access
Listar usuários do workspace Slack. It is categorised as a Read tool in the Slack MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Slack MCP Server 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 Slack MCP Server. 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 Slack MCP Server MCP server (will2023a/mcp-slack). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
list_slack_users is one line of Slack MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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