Revoke a role from a user (MySQL 8.0+).
AI agents use revoke_role_from_user to create or update resources in Mysql — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mysql environment.
Revoking a role from a user modifies access control permissions/privileges. This is a reversible write operation (the role can be re-granted), but it carries high severity because it directly affects authorization, potentially removing a user's access to critical resources or disrupting application functionality if misused.
From the tool's definition Revoke a role from a user
Documented attack patterns abuse exactly the kind of access revoke_role_from_user gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mysql, and nothing reaches the server without passing your rules. This is the rule we recommend for revoke_role_from_user:
{
"version": "1",
"default": "deny",
"tools": {
"revoke_role_from_user": {
"limits": [
{
"counter": "revoke_role_from_user_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}revoke_role_from_user 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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Revoke a role from a user (MySQL 8.0+). It is categorised as a Write tool in the Mysql MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mysql MCP server in PolicyLayer and add a rule for revoke_role_from_user: 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 Mysql. Nothing to install.
revoke_role_from_user 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 revoke_role_from_user 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 revoke_role_from_user. 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.
revoke_role_from_user is provided by the Mysql MCP server (mukul975/mysql-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mysql, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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233 Mysql tools catalogued and risk-classified — across an index of 43,000+ MCP servers.