create_share_link · Synology MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_share_link does on Synology MCP Server

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

WHY IT NEEDS A POLICY

Why create_share_link needs a policy

Creating a public share link is a reversible write operation — it generates new shareable URLs and changes access settings but does not delete or modify the underlying data, nor does it execute arbitrary code.

From the tool's definition Tool creates a public sharing link, which modifies sharing configuration and metadata associated with files/folders. The description explicitly states it creates a link and the [control] annotation indicates it's a controlled operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_share_link Rate-limited

create_share_link 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_share_link": {
      "limits": [
        {
          "counter": "create_share_link_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 Synology MCP Server, so you can run agents against it safely.

FAQ

Questions about create_share_link

What does the create_share_link tool do? +

Create a public sharing link for a file or folder. [control]. It is categorised as a Write tool in the Synology MCP Server 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_share_link? +

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

What risk level is create_share_link? +

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

Can I rate-limit create_share_link? +

Yes. Add a rate_limit block to the create_share_link 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_share_link completely? +

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

create_share_link is provided by the Synology MCP Server MCP server (rafalr100/synology-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.