is_subset

Check if array1 is a subset of array2.

SERVERTinyFn SOURCEhttps://api.tinyfn.io/mcp/all/

Low RISK CLASS

Category Read

Parameters 22 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-tinyfn-tinyfn/is-subset.md

WHAT IT DOES

What is_subset does on TinyFn

AI agents call is_subset to retrieve information from TinyFn without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required	Description
`array1`	string	Yes	Potential subset
`array2`	string	Yes	Potential superset

Parameters from the server's own tool schema.

RISK

Why is_subset is rated Low

This tool performs a logical comparison between two arrays to determine a subset relationship. It retrieves or evaluates a property of the input data without creating, modifying, deleting, or executing external operations. The operation is deterministic and read-only, making it a Read category tool with low severity risk.

From the tool's definition Tool name 'is_subset' and description 'Check if array1 is a subset of array2' indicate a pure query/comparison operation with no side effects or data modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs is_subset safely

PolicyLayer is an MCP gateway: it sits between your AI agents and TinyFn, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For is_subset, this is the rule to start with:

is_subset Allowed

is_subset is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "is_subset": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect TinyFn, apply this rule, and every is_subset call is checked against it from then on.

FAQ

Questions about is_subset

What does the is_subset tool do? +

Check if array1 is a subset of array2. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.

What parameters does is_subset accept? +

is_subset accepts 2 parameters: array1, array2. Required: array1, array2. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on is_subset? +

Register the TinyFn MCP server in PolicyLayer and add a rule for is_subset: 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 is_subset? +

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

Can I rate-limit is_subset? +

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

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

is_subset 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.

KEEP EXPLORING

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