mysql_add_foreign_key

A write tool on the Mysql MCP server.

SERVERMysql SOURCEmukul975/mysql-mcp-server

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/mukul975-mysql-mcp-server/mysql-add-foreign-key.md

WHAT IT DOES

What mysql_add_foreign_key does on Mysql

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

RISK

Why mysql_add_foreign_key is rated Medium

Adding a foreign key constraint is a reversible schema modification (Write category) rather than Destructive because the constraint can be dropped. However, the severity is high because altering database schema can impact application behavior, data integrity enforcement, and requires administrative privileges.

From the tool's definition Tool name 'mysql_add_foreign_key' indicates modification of database schema by adding a foreign key constraint. Server description claims 'read-only queries' but this tool modifies schema structure, contradicting that claim.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs mysql_add_foreign_key safely

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

mysql_add_foreign_key Rate-limited

mysql_add_foreign_key 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_add_foreign_key": {
      "limits": [
        {
          "counter": "mysql_add_foreign_key_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, apply this rule, and every mysql_add_foreign_key call is checked against it from then on.

FAQ

Questions about mysql_add_foreign_key

What does the mysql_add_foreign_key tool do? +

mysql_add_foreign_key is a write tool on the Mysql MCP server. It is categorised as a Write tool in the Mysql 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_add_foreign_key? +

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

What risk level is mysql_add_foreign_key? +

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

Can I rate-limit mysql_add_foreign_key? +

Yes. Add a rate_limit block to the mysql_add_foreign_key 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_add_foreign_key completely? +

Set action: deny in the PolicyLayer policy for mysql_add_foreign_key. 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_add_foreign_key? +

mysql_add_foreign_key is provided by the Mysql MCP server (mukul975/mysql-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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