获取所有数据库列表，支持筛选和限制结果数量 Args: pattern: 数据库名称匹配模式 (可选, 例如 '%test%') limit: 返回结果的最大数量 (默认100，设为0表示无限制) exclude_system: 是否排除系统数据库 (默认为True) Returns: 数据库列表的JSON字符串
AI agents call mysql_show_databases to retrieve information from MySQL MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query operation that lists databases with optional filtering. It has no side effects, does not modify data, and presents minimal risk even if misused by an AI agent—the worst outcome would be information disclosure about database names, which is typically non-sensitive in a properly architected system.
From the tool's definition Tool retrieves database list with filtering and limiting options. Description states it returns 'a JSON string of database list' with parameters for pattern matching and result limits. No modification, deletion, or execution of arbitrary operations occurs.
Documented attack patterns abuse exactly the kind of access mysql_show_databases gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MySQL MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for mysql_show_databases:
{
"version": "1",
"default": "deny",
"tools": {
"mysql_show_databases": {}
}
}mysql_show_databases is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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获取所有数据库列表，支持筛选和限制结果数量 Args: pattern: 数据库名称匹配模式 (可选, 例如 '%test%') limit: 返回结果的最大数量 (默认100，设为0表示无限制) exclude_system: 是否排除系统数据库 (默认为True) Returns: 数据库列表的JSON字符串. It is categorised as a Read tool in the MySQL MCP Server MCP Server, which means it retrieves data without modifying state.
Register the MySQL MCP Server MCP server in PolicyLayer and add a rule for mysql_show_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 MCP Server. Nothing to install.
mysql_show_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_show_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_show_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_show_databases is provided by the MySQL MCP Server MCP server (mangooer/mysql-mcp-server-sse). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MySQL MCP Server, 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.
12 MySQL MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.