create_short_url · Mcp Shlink MCP: Risk & Policy

WHAT IT DOES

What create_short_url does on Mcp Shlink

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

WHY IT NEEDS A POLICY

Why create_short_url needs a policy

This tool creates new data (short URL mappings) in a reversible manner. It does not execute arbitrary code, delete data, or move money. While creation is a Write operation, the severity is medium rather than high because short URLs are typically non-sensitive metadata and can be easily modified or recreated if needed. The blast radius of misuse (e.g., creating many spam short URLs) is moderate.

From the tool's definition Tool name 'create_short_url' and description 'Create a new shortened URL in Shlink' indicate data creation. The server supports 'creation, listing, retrieval, and deletion of short URLs.'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_short_url Rate-limited

create_short_url 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": {
    "create_short_url": {
      "limits": [
        {
          "counter": "create_short_url_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about create_short_url

What does the create_short_url tool do? +

Create a new shortened URL in Shlink. It is categorised as a Write tool in the Mcp Shlink MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_short_url? +

Register the Mcp Shlink MCP server in PolicyLayer and add a rule for create_short_url: 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 Mcp Shlink. Nothing to install.

What risk level is create_short_url? +

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

Can I rate-limit create_short_url? +

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

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

create_short_url is provided by the Mcp Shlink MCP server (magnus919/mcp-shlink). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.