Grant or revoke specific permissions on a role. Role name is fuzzy-matched.
AI agents use modify_role_permissions 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.
This tool modifies role permissions (Write category) rather than executing arbitrary actions or destroying data. While permission changes are impactful and could affect many users' access (high severity), they are reversible—permissions can be re-granted or revoked again. The fuzzy matching on role name adds some risk of unintended targets.
From the tool's definition Tool description states 'Grant or revoke specific permissions on a role' — these are reversible modifications to role permissions that affect access control across the Discord server.
Documented attack patterns abuse exactly the kind of access modify_role_permissions 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 modify_role_permissions:
{
"version": "1",
"default": "deny",
"tools": {
"modify_role_permissions": {
"limits": [
{
"counter": "modify_role_permissions_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}modify_role_permissions 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.
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Grant or revoke specific permissions on a role. Role name is fuzzy-matched. 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 modify_role_permissions: 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.
modify_role_permissions 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 modify_role_permissions 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 modify_role_permissions. 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.
modify_role_permissions 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.