is_fibonacci
Check if a number is a Fibonacci number.
This record as markdown: /tools/io-tinyfn-tinyfn/is-fibonacci.md
What is_fibonacci does on TinyFn
AI agents call is_fibonacci 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 |
|---|---|---|---|
number | integer | Yes | The number to check |
Parameters from the server's own tool schema.
Why is_fibonacci is rated Low
This is a deterministic mathematical validation function that performs a read-only check on numeric input. It returns boolean or informational result without creating, modifying, deleting, or executing any operations. No financial, destructive, or execution risk is present.
From the tool's definition Tool name 'is_fibonacci' and description 'Check if a number is a Fibonacci number' indicates a pure query operation that retrieves or validates information without side effects or state modification.
Attacks that exploit this kind of access
The rule that runs is_fibonacci 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_fibonacci, this is the rule to start with:
is_fibonacci is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect TinyFn, apply this rule, and every is_fibonacci call is checked against it from then on.
Questions about is_fibonacci
Check if a number is a Fibonacci number. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
is_fibonacci accepts 1 parameter: number. Required: number. The full parameter table on this page comes from the server's own tool schema.
Register the TinyFn MCP server in PolicyLayer and add a rule for is_fibonacci: 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.
is_fibonacci is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the is_fibonacci 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.
Set action: deny in the PolicyLayer policy for is_fibonacci. 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.
is_fibonacci 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.
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