Rename an existing custom emoji by its current name or ID.
AI agents use rename_emoji to create or update resources in Discord — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Discord environment.
The tool modifies metadata of an existing custom emoji (its name) in a reversible manner. This is a write operation that changes data but does not create new resources, execute arbitrary code, delete data, or move funds. The blast radius is low since emoji renaming has minimal security or operational impact on a Discord server. Confidence is high because the intent is clear from both name and description.
From the tool's definition Tool name 'rename_emoji' with description 'Rename an existing custom emoji' indicates modification of an existing resource's metadata without deletion or creation of new data.
Documented attack patterns abuse exactly the kind of access rename_emoji gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Discord, and nothing reaches the server without passing your rules. This is the rule we recommend for rename_emoji:
{
"version": "1",
"default": "deny",
"tools": {
"rename_emoji": {
"limits": [
{
"counter": "rename_emoji_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}rename_emoji stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Rename an existing custom emoji by its current name or ID. It is categorised as a Write tool in the Discord MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Discord MCP server in PolicyLayer and add a rule for rename_emoji: 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 Discord. Nothing to install.
rename_emoji is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the rename_emoji 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 rename_emoji. 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.
rename_emoji is provided by the Discord MCP server (hardheadhackerhead/discord-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Discord, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
139 Discord tools catalogued and risk-classified — across an index of 43,000+ MCP servers.