mysql_json_replace

Replace values in JSON columns only if the path exists.

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

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

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

WHAT IT DOES

What mysql_json_replace does on Mysql Mcp

AI agents use mysql_json_replace to create or update resources in Mysql Mcp, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mysql Mcp environment.

RISK

Why mysql_json_replace is rated Medium

The tool modifies JSON column data by replacing values at specified paths, which is a reversible write operation. It does not delete data (would be Destructive) nor execute arbitrary code (would be Execute), but rather performs a targeted update on JSON structures.

From the tool's definition Tool name 'mysql_json_replace' and description states it will 'Replace values in JSON columns' — this is a modification operation that alters existing data.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs mysql_json_replace 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_replace, this is the rule to start with:

mysql_json_replace Rate-limited

mysql_json_replace stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mysql_json_replace": {
      "limits": [
        {
          "counter": "mysql_json_replace_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT 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_replace call is checked against it from then on.

FAQ

Questions about mysql_json_replace

What does the mysql_json_replace tool do? +

Replace values in JSON columns only if the path exists. It is categorised as a Write tool in the Mysql Mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on mysql_json_replace? +

Register the Mysql MCP server in PolicyLayer and add a rule for mysql_json_replace: 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_replace? +

mysql_json_replace is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit mysql_json_replace? +

Yes. Add a rate_limit block to the mysql_json_replace 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_replace completely? +

Set action: deny in the PolicyLayer policy for mysql_json_replace. 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_replace? +

mysql_json_replace 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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