Show foreign key constraints for a table.
AI agents call mysql_show_foreign_keys to retrieve information from Mysql without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays foreign key constraint information from a table's metadata. It performs a read-only query operation (analogous to SHOW CREATE TABLE or INFORMATION_SCHEMA queries) with no ability to modify, delete, or execute operations. The blast radius is minimal - it only exposes structural database metadata that would typically be accessible to any authenticated database user.
From the tool's definition Tool name contains 'show' and description states 'Show foreign key constraints for a table' - a retrieval operation with no modification or execution capability. Returns metadata about existing database schema constraints.
Documented attack patterns abuse exactly the kind of access mysql_show_foreign_keys gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mysql, and nothing reaches the server without passing your rules. This is the rule we recommend for mysql_show_foreign_keys:
{
"version": "1",
"default": "deny",
"tools": {
"mysql_show_foreign_keys": {}
}
}mysql_show_foreign_keys is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Show foreign key constraints for a table. It is categorised as a Read tool in the Mysql MCP Server, which means it retrieves data without modifying state.
Register the Mysql MCP server in PolicyLayer and add a rule for mysql_show_foreign_keys: 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.
mysql_show_foreign_keys 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_show_foreign_keys 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_show_foreign_keys. 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_show_foreign_keys 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.
Start from Mysql, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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233 Mysql tools catalogued and risk-classified — across an index of 43,000+ MCP servers.