Archive a Slack channel.
AI agents call archive_channel to permanently remove resources in Slack MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Archiving a Slack channel is a destructive, hard-to-reverse operation. While technically a Slack admin can unarchive a channel, the action immediately disrupts all members' access and communication, making it functionally irreversible in most contexts. The blast radius is high because it affects all members of the channel and destroys ongoing collaboration.
From the tool's definition Archive a Slack channel — archiving a channel is effectively irreversible in normal workflows; it removes the channel from active use, hides it from members, and cannot be automatically undone without explicit admin action.
Attacks that exploit this kind of access
Archive a Slack channel. It is categorised as a Destructive tool in the Slack MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Slack MCP Server MCP server in PolicyLayer and add a rule for archive_channel: 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.
archive_channel is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the archive_channel 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 archive_channel. 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.
archive_channel is provided by the Slack MCP Server MCP server (piekstra/slack-mcp-server). 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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