List all databases accessible to the current user.
AI agents call mysql_databases to retrieve information from Mysql without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves database metadata without side effects. It enables information discovery but poses minimal risk if misused by an AI agent—at worst, it reveals database structure to which the current user already has access. Classification as Read is appropriate.
From the tool's definition Tool description states 'List all databases' with no modification or deletion capability mentioned. Sibling tools like 'describe_table' and 'analyze_index_usage' confirm a read-only analytics pattern.
Documented attack patterns abuse exactly the kind of access mysql_databases 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_databases:
{
"version": "1",
"default": "deny",
"tools": {
"mysql_databases": {}
}
}mysql_databases 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 databases accessible to the current user. It is categorised as a Read tool in the Mysql MCP Server, which means it retrieves data without modifying state.
Register the Mysql MCP server in PolicyLayer and add a rule for mysql_databases: 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_databases 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 mysql_databases 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_databases. 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_databases 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.