List all members in a thread.
AI agents call list_thread_members to retrieve information from Discord without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about thread membership without creating, modifying, or deleting any data. It is a straightforward read operation that queries existing state. The low severity reflects minimal blast radius—even if misused by an AI agent, listing thread members causes no harm to data or system integrity.
From the tool's definition Tool name 'list_thread_members' and description 'List all members in a thread' indicate a query/retrieval operation with no modification or side effects.
Documented attack patterns abuse exactly the kind of access list_thread_members 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 list_thread_members:
{
"version": "1",
"default": "deny",
"tools": {
"list_thread_members": {}
}
}list_thread_members is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all members in a thread. It is categorised as a Read tool in the Discord MCP Server, which means it retrieves data without modifying state.
Register the Discord MCP server in PolicyLayer and add a rule for list_thread_members: 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.
list_thread_members 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 list_thread_members 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 list_thread_members. 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.
list_thread_members 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.
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139 Discord tools catalogued and risk-classified — across an index of 43,000+ MCP servers.