mysql_show_indexes

THE RISK

Low Risk

Why mysql_show_indexes needs a policy

This tool performs a read-only query operation that retrieves schema metadata about indexes. It has no side effects, does not modify data, and cannot execute arbitrary code or commands.

From the tool's definition The tool retrieves index metadata for a table (获取表的索引信息 = 'get table index information'). It takes table and database names as arguments and returns JSON index information. No modification, deletion, or execution capabilities are present.

Documented attack patterns abuse exactly the kind of access mysql_show_indexes gives an agent:

POLICY

How to control mysql_show_indexes

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_indexes:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mysql_show_indexes": {}
  }
}

mysql_show_indexes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register MySQL MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

More MySQL MCP Server tools

Execute mysql_paginate_results 分页执行查询以处理大型结果集 Args: query: SQL查询语句 page: 页码 (从1开 Execute mysql_query 执行MySQL查询并返回结果 Args: query: SQL查询语句 params: 查询参数 Read mysql_describe_table 描述表结构 Args: table: 表名 database: 数据库名称 (可选，默认使用当前连 Read mysql_show_columns 获取表的列信息 Args: table: 表名 database: 数据库名称 (可选，默认使用当 Read mysql_show_create_table 获取表的创建语句 Args: table: 表名 database: 数据库名称 (可选，默认使用 Read mysql_show_databases 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 Read mysql_show_foreign_keys 获取表的外键约束信息 Args: table: 表名 database: 数据库名称 (可选，默认 Read mysql_show_status 获取MySQL服务器状态 Args: pattern: 状态名称匹配模式 (可选, 例如 '%conn%')

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about mysql_show_indexes

What does the mysql_show_indexes tool do? +

获取表的索引信息 Args: table: 表名 database: 数据库名称 (可选，默认使用当前连接的数据库) Returns: 表索引信息的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.

How do I enforce a policy on mysql_show_indexes? +

Register the MySQL MCP Server MCP server in PolicyLayer and add a rule for mysql_show_indexes: 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.

What risk level is mysql_show_indexes? +

mysql_show_indexes is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit mysql_show_indexes? +

Yes. Add a rate_limit block to the mysql_show_indexes 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.

How do I block mysql_show_indexes completely? +

Set action: deny in the PolicyLayer policy for mysql_show_indexes. 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.

What MCP server provides mysql_show_indexes? +

mysql_show_indexes 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.

Enforce policy on every MySQL MCP Server tool call.

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.

CHECK YOUR STACK →