patch_mysql_instance

THE RISK

High Risk

Why patch_mysql_instance needs a policy

Patching a database instance triggers an external operational change (applying software updates) that can cause restarts, downtime, or behavioral changes. It is not a simple write/create of a data record, but an execution of an update process on infrastructure. While it may be partially reversible in some cases, the primary action is executing an update pipeline, which can have significant side effects.

From the tool's definition 'Apply the latest updates to a MySQL database instance' — triggers an update/patch operation on a live database

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

POLICY

How to control patch_mysql_instance

PolicyLayer is an MCP gateway — it sits between your AI agents and Linode MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for patch_mysql_instance:

policy.json

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

patch_mysql_instance 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 Linode MCP Server — 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 416 Linode MCP Server tools →

Execute tools on other servers

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Go deeper

High-risk tools in Linode MCP Server → 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 patch_mysql_instance

What does the patch_mysql_instance tool do? +

Apply the latest updates to a MySQL database instance. It is categorised as a Execute tool in the Linode MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on patch_mysql_instance? +

Register the Linode MCP Server MCP server in PolicyLayer and add a rule for patch_mysql_instance: 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 Linode MCP Server. Nothing to install.

What risk level is patch_mysql_instance? +

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

Can I rate-limit patch_mysql_instance? +

Yes. Add a rate_limit block to the patch_mysql_instance 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 patch_mysql_instance completely? +

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

patch_mysql_instance is provided by the Linode MCP Server MCP server (takashito/linode-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 Linode MCP Server tool call.

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

CHECK YOUR STACK →