slack_get_channel_history

THE RISK

Low Risk

Why slack_get_channel_history needs a policy

This tool retrieves historical message data from a Slack channel. It performs a query-like operation that reads existing data without creating, modifying, deleting, or executing actions. The blast radius is minimal as it only accesses channel message history.

From the tool's definition Tool name 'slack_get_channel_history' and description 'Get recent messages from a channel' indicate a retrieval operation with no side effects.

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

POLICY

How to control slack_get_channel_history

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_get_channel_history:

policy.json

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

slack_get_channel_history 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 →

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EXPLORE

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FAQ

Questions about slack_get_channel_history

What does the slack_get_channel_history tool do? +

Get recent messages from a channel. 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_get_channel_history? +

Register the MCP-Brave-Search MCP server in PolicyLayer and add a rule for slack_get_channel_history: 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_get_channel_history? +

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

Can I rate-limit slack_get_channel_history? +

Yes. Add a rate_limit block to the slack_get_channel_history 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_get_channel_history completely? +

Set action: deny in the PolicyLayer policy for slack_get_channel_history. 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_get_channel_history? +

slack_get_channel_history 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 →