mysql_flush_tables

THE RISK

High Risk

Why mysql_flush_tables needs a policy

Flushing tables is a server-level operation that forces MySQL to close all open tables, clears caches, and can interrupt active queries/connections. While not strictly destructive (no data is deleted), it is a privileged server operation with broad impact on all connected clients and database performance.

From the tool's definition 'Flush MySQL tables' - FLUSH TABLES closes all open tables and flushes the query cache, affecting database performance and active connections

Documented attack patterns abuse exactly the kind of access mysql_flush_tables gives an agent:

POLICY

How to control mysql_flush_tables

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_flush_tables:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mysql_flush_tables": {
      "limits": [
        {
          "counter": "mysql_flush_tables_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

mysql_flush_tables stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Mysql — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 233 Mysql tools →

Execute tools on other servers

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Go deeper

High-risk tools in Mysql → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about mysql_flush_tables

What does the mysql_flush_tables tool do? +

Flush MySQL tables. It is categorised as a Execute tool in the Mysql MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on mysql_flush_tables? +

Register the Mysql MCP server in PolicyLayer and add a rule for mysql_flush_tables: 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_flush_tables? +

mysql_flush_tables is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit mysql_flush_tables? +

Yes. Add a rate_limit block to the mysql_flush_tables 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_flush_tables completely? +

Set action: deny in the PolicyLayer policy for mysql_flush_tables. 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_flush_tables? +

mysql_flush_tables 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.

Enforce policy on every Mysql tool call.

Start from Mysql, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →