emoji_remove

Remove a custom emoji (undocumented session endpoint).

SERVERSlack SOURCEkarbassi/slack-mcp

Critical RISK CLASS

Category Destructive

Parameters 00 required

Recommended Hiddensee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/karbassi-slack-mcp/emoji-remove.md

WHAT IT DOES

What emoji_remove does on Slack

AI agents call emoji_remove to permanently remove resources in Slack, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.

RISK

Why emoji_remove is rated Critical

This tool deletes custom emoji from a Slack workspace, which is an irreversible operation that cannot be undone through normal means. While the blast radius is limited to emoji assets (not critical business data), the destructive nature of deletion operations places it in the Destructive category. An AI agent could maliciously remove organizational emoji branding or symbols.

From the tool's definition Tool name 'emoji_remove' combined with description stating it removes a custom emoji. The verb 'remove' indicates irreversible deletion of a workspace asset.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs emoji_remove safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Slack, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For emoji_remove, this is the rule to start with:

emoji_remove Hidden

emoji_remove is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "emoji_remove"
  ]
}

RESTRICT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Slack, apply this rule, and every emoji_remove call is checked against it from then on.

FAQ

Questions about emoji_remove

What does the emoji_remove tool do? +

Remove a custom emoji (undocumented session endpoint). It is categorised as a Destructive tool in the Slack MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on emoji_remove? +

Register the Slack MCP server in PolicyLayer and add a rule for emoji_remove: 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. Nothing to install.

What risk level is emoji_remove? +

emoji_remove is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit emoji_remove? +

Yes. Add a rate_limit block to the emoji_remove 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 emoji_remove completely? +

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

emoji_remove is provided by the Slack MCP server (karbassi/slack-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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