null · TinyFn MCP: Risk & Policy

WHAT IT DOES

What null does on TinyFn

AI agents call null as a supporting operation in TinyFn workflows.

WHY IT NEEDS A POLICY

Why null needs a policy

This tool simply returns a null value with no side effects, no data retrieval, no execution, and no modification. It is a pure deterministic utility that produces a constant output, fitting 'Other' as it does not meaningfully belong to any other category.

From the tool's definition Returns null. For when you need a null.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

null Rate-limited

null gets a rate cap, and everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "null": {
      "limits": [
        {
          "counter": "null_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

SET A RULE FOR THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about null

What does the null tool do? +

Returns null. For when you need a null. It is categorised as a Other tool in the TinyFn MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on null? +

Register the TinyFn MCP server in PolicyLayer and add a rule for null: 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 TinyFn. Nothing to install.

What risk level is null? +

null is a Other tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit null? +

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

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

null is provided by the TinyFn MCP server (https://api.tinyfn.io/mcp/all/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

// THE FULL RECORD

null is one line of TinyFn's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

Teams ship this data inside their own products. See what a licence covers →