mysql_substring

What mysql_substring does on Mysql Mcp

AI agents call mysql_substring to retrieve information from Mysql Mcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Why mysql_substring is rated Low

This tool performs a substring extraction operation, which is a read-only data transformation. It queries column values and returns a portion of those values without creating, modifying, deleting, or executing any side effects. The operation is analogous to a SELECT statement with string functions in SQL, making it a Read category tool with low severity.

From the tool's definition Tool name 'mysql_substring' and description 'Extract substrings from column values' indicate a query operation that retrieves transformed data without modifying or deleting any underlying records.

The rule that runs mysql_substring safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mysql Mcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For mysql_substring, this is the rule to start with:

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

Questions about mysql_substring