mysql_json_extract

Extract values from JSON columns using JSON path expressions.

SERVERMysql Mcp SOURCEoci:docker.io/writenotenow/mysql-mcp:v1.0.0

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-neverinfamous-mysql-mcp/mysql-json-extract.md

WHAT IT DOES

What mysql_json_extract does on Mysql Mcp

AI agents call mysql_json_extract 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.

RISK

Why mysql_json_extract is rated Low

This tool performs data retrieval only—it reads JSON column data and returns values matching specified path expressions. It does not create, modify, delete, or execute arbitrary code. The operation is non-destructive with no side effects.

From the tool's definition Tool name 'mysql_json_extract' and description 'Extract values from JSON columns using JSON path expressions' indicate a retrieval operation. The verb 'extract' combined with 'using JSON path expressions' describes querying/accessing data without modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs mysql_json_extract 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_json_extract, this is the rule to start with:

mysql_json_extract Allowed

mysql_json_extract is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mysql Mcp, apply this rule, and every mysql_json_extract call is checked against it from then on.

FAQ

Questions about mysql_json_extract

What does the mysql_json_extract tool do? +

Extract values from JSON columns using JSON path expressions. It is categorised as a Read tool in the Mysql Mcp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on mysql_json_extract? +

Register the Mysql MCP server in PolicyLayer and add a rule for mysql_json_extract: 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. Nothing to install.

What risk level is mysql_json_extract? +

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

Can I rate-limit mysql_json_extract? +

Yes. Add a rate_limit block to the mysql_json_extract 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_json_extract completely? +

Set action: deny in the PolicyLayer policy for mysql_json_extract. 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_json_extract? +

mysql_json_extract is provided by the Mysql MCP server (oci:docker.io/writenotenow/mysql-mcp:v1.0.0). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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