alter-table · Mysql Multi MCP: Risk & Policy

WHAT IT DOES

What alter-table does on Mysql Multi

AI agents invoke alter-table to trigger actions in Mysql Multi. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why alter-table needs a policy

ALTER TABLE runs SQL DDL that modifies database schema. While it can be partially reversible (e.g., adding a column), it can also cause irreversible data loss (e.g., DROP COLUMN, MODIFY altering data types truncating data). Since the tool accepts a full ALTER TABLE statement with arbitrary content, the most severe applicable category is Execute, as it runs user-supplied SQL.

From the tool's definition "Alter a table using a full ALTER TABLE SQL statement" — executes arbitrary ALTER TABLE SQL, which can modify column definitions, constraints, and structure

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

alter-table Rate-limited

alter-table 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "alter-table": {
      "limits": [
        {
          "counter": "alter-table_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Mysql Multi, so you can run agents against it safely.

FAQ

Questions about alter-table

What does the alter-table tool do? +

Alter a table using a full ALTER TABLE SQL statement. It is categorised as a Execute tool in the Mysql Multi MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on alter-table? +

Register the Mysql Multi MCP server in PolicyLayer and add a rule for alter-table: 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 Multi. Nothing to install.

What risk level is alter-table? +

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

Can I rate-limit alter-table? +

Yes. Add a rate_limit block to the alter-table 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 alter-table completely? +

Set action: deny in the PolicyLayer policy for alter-table. 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 alter-table? +

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