update_folder · Syncthing MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_folder does on Syncthing MCP Server

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

WHY IT NEEDS A POLICY

Why update_folder needs a policy

The tool updates folder settings in Syncthing, which is a reversible data modification (Write category). The severity is medium because misconfigured folder updates could disrupt file synchronization across multiple instances, but the action is not destructive (data isn't deleted) nor financial.

From the tool's definition Tool name 'update_folder' indicates modification of folder configurations. The server description states it 'enables users to...modify folder configurations through natural language commands.' However, the tool description itself is empty, which reduces…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_folder Rate-limited

update_folder 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": {
    "update_folder": {
      "limits": [
        {
          "counter": "update_folder_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 Syncthing MCP Server, so you can run agents against it safely.

FAQ

Questions about update_folder

What does the update_folder tool do? +

update_folder. It is categorised as a Write tool in the Syncthing 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 update_folder? +

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

What risk level is update_folder? +

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

Can I rate-limit update_folder? +

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

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

update_folder is provided by the Syncthing MCP Server MCP server (zaphodsdad/syncthing-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.