set_fnumber · So Dsc MCP: Risk & Policy

WHAT IT DOES

What set_fnumber does on So Dsc

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

WHY IT NEEDS A POLICY

Why set_fnumber needs a policy

This tool modifies a camera setting (aperture/f-number), which is a reversible write operation. It adjusts exposure parameters on the camera but does not delete data, execute code, or have financial implications. Misuse could result in poorly exposed shots but has minimal blast radius.

From the tool's definition Set aperture (f-number) as a string like '5.6'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_fnumber Rate-limited

set_fnumber 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": {
    "set_fnumber": {
      "limits": [
        {
          "counter": "set_fnumber_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 So Dsc, so you can run agents against it safely.

FAQ

Questions about set_fnumber

What does the set_fnumber tool do? +

Set aperture (f-number) as a string like "5.6". Only honored in. It is categorised as a Write tool in the So Dsc MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_fnumber? +

Register the So Dsc MCP server in PolicyLayer and add a rule for set_fnumber: 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 So Dsc. Nothing to install.

What risk level is set_fnumber? +

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

Can I rate-limit set_fnumber? +

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

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

set_fnumber is provided by the So Dsc MCP server (nananek/so-dsc). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.