slack_list_channels

THE RISK

Low Risk

Why slack_list_channels needs a policy

This tool queries and retrieves channel information from a Slack workspace without altering any data. It is a read-only operation that has no side effects. The blast radius is minimal—an agent using this tool can only discover existing channel names and metadata, which is already public or pre-defined information accessible to workspace members.

From the tool's definition Tool name and description indicate a retrieval action: 'List public or pre-defined channels' with 'pagination' support. No modification, deletion, or execution is implied.

Documented attack patterns abuse exactly the kind of access slack_list_channels gives an agent:

POLICY

How to control slack_list_channels

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP-Brave-Search, and nothing reaches the server without passing your rules. This is the rule we recommend for slack_list_channels:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "slack_list_channels": {}
  }
}

slack_list_channels is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register MCP-Brave-Search — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
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FAQ

Questions about slack_list_channels

What does the slack_list_channels tool do? +

List public or pre-defined channels in the workspace with pagination. It is categorised as a Read tool in the MCP-Brave-Search MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on slack_list_channels? +

Register the MCP-Brave-Search 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-Brave-Search. Nothing to install.

What risk level is slack_list_channels? +

slack_list_channels is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit slack_list_channels? +

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.

How do I block slack_list_channels completely? +

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.

What MCP server provides slack_list_channels? +

slack_list_channels is provided by the MCP-Brave-Search MCP server (modelcontextprotocol/servers-archived). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP-Brave-Search tool call.

Start from MCP-Brave-Search, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →