Lists the users who reacted with a specific emoji to a Discord message. Uses REST fetch and does not require Gateway intents. Returns up to 100 users per call.
AI agents call discord_get_reaction_users to retrieve information from MCP-Discord without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries reaction metadata to retrieve a list of users. It has no side effects, does not modify Discord state, and returns informational data only. The 100-user pagination limit is consistent with safe read operations. Classification as Read is appropriate.
From the tool's definition Tool description states 'Lists the users who reacted with a specific emoji to a Discord message' and 'Uses REST fetch' — purely retrieves data without modification. The name prefix 'get' and verb 'Lists' confirm read-only semantics.
Documented attack patterns abuse exactly the kind of access discord_get_reaction_users gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP-Discord, and nothing reaches the server without passing your rules. This is the rule we recommend for discord_get_reaction_users:
{
"version": "1",
"default": "deny",
"tools": {
"discord_get_reaction_users": {}
}
}discord_get_reaction_users is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Lists the users who reacted with a specific emoji to a Discord message. Uses REST fetch and does not require Gateway intents. Returns up to 100 users per call. It is categorised as a Read tool in the MCP-Discord MCP Server, which means it retrieves data without modifying state.
Register the MCP-Discord MCP server in PolicyLayer and add a rule for discord_get_reaction_users: 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-Discord. Nothing to install.
discord_get_reaction_users is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the discord_get_reaction_users 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 discord_get_reaction_users. 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.
discord_get_reaction_users is provided by the MCP-Discord MCP server (barryyip0625/mcp-discord). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP-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.
43 MCP-Discord tools catalogued and risk-classified — across an index of 43,000+ MCP servers.