List all available databases
AI agents call mysql_list_databases to retrieve information from MySQL ReadOnly 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 (listing databases) that returns metadata about available databases without modifying, executing code, or causing destructive changes. The blast radius is minimal—knowledge of database names does not inherently enable unauthorized access or actions. The read-only design and lack of side effects clearly classify this as a Read operation.
From the tool's definition Tool name is 'mysql_list_databases' and description states 'List all available databases'. The server is explicitly described as 'ReadOnly' with 'read-only access' and 'SQL injection protection'.
Attacks that exploit this kind of access
List all available databases. It is categorised as a Read tool in the MySQL ReadOnly MCP Server MCP Server, which means it retrieves data without modifying state.
Register the MySQL ReadOnly MCP Server MCP server in PolicyLayer and add a rule for mysql_list_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 ReadOnly MCP Server. Nothing to install.
mysql_list_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_list_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_list_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_list_databases is provided by the MySQL ReadOnly MCP Server MCP server (zhaojw-php/mysql-readonly-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →