Listar canais do Slack
AI agents call list_slack_channels 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 retrieves channel information from a Slack workspace with no side effects. It is a read-only operation similar to other retrieval tools on the server like 'get_workspace_info' and 'get_slack_channel_history'. The blast radius is minimal—at worst, an AI could learn channel names and structure, which poses no immediate risk. No data is created, modified, deleted, or financial actions are taken.
From the tool's definition Tool name 'list_slack_channels' and description 'Listar canais do Slack' (List Slack channels) indicate a query/retrieval operation that lists channels without modifying any data.
Attacks that exploit this kind of access
Listar canais do 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_channels: 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_channels 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_channels 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_channels. 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_channels 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.
Every MCP server has a record like this.
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