Create a new MySQL user.
AI agents use mysql_create_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.
Creating a MySQL user is a Write action that modifies database state by adding a new authentication principal. While not Destructive (user creation is theoretically reversible via DROP USER), and not Financial, this is a high-severity Write because it grants database access privileges and affects production security posture. The tool operates on a production MySQL database as stated in the server description.
From the tool's definition Tool name 'mysql_create_user' and description 'Create a new MySQL user' explicitly indicate irreversible user creation in a production MySQL database.
Documented attack patterns abuse exactly the kind of access mysql_create_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 mysql_create_user:
{
"version": "1",
"default": "deny",
"tools": {
"mysql_create_user": {
"limits": [
{
"counter": "mysql_create_user_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}mysql_create_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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Create a new MySQL user. 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 mysql_create_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.
mysql_create_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 mysql_create_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 mysql_create_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.
mysql_create_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.