List public channels in the workspace with pagination
AI agents call slack_list_channels to retrieve information from MCP Server for Slack without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only queries and returns a list of existing public channels. It has no side effects, does not modify data, execute code, delete resources, or move money. It is a straightforward data retrieval operation, making it a Read category tool with low severity.
From the tool's definition Tool is described as 'List public channels in the workspace with pagination' — a read-only operation that retrieves channel metadata without modification, deletion, or external execution.
Attacks that exploit this kind of access
List public channels in the workspace with pagination. It is categorised as a Read tool in the MCP Server for Slack MCP Server, which means it retrieves data without modifying state.
Register the MCP Server for Slack MCP server in PolicyLayer and add a rule for slack_list_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 MCP Server for Slack. Nothing to install.
slack_list_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 slack_list_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 slack_list_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.
slack_list_channels is provided by the MCP Server for Slack MCP server (z9905080/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.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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