Number MCP Tools for AI Agents

"What's 1437 in Roman numerals?" Your agent says MCDXXXVII. Is that right? (It is — this time.) But ask about 3999 or 49 and errors creep in. These tools convert between number representations correctly.

All Number Tools (20)

Your agent gets access to 20 number tools via the /mcp/number/ endpoint. Here's the complete list:

Tool	Description
`number/factors`	Prime Factors
`number/divisors`	Get Divisors
`number/nth-prime`	Nth Prime
`number/primes-in-range`	Primes In Range
`number/roman`	To Roman
`number/base-convert`	Base Convert
`number/is-perfect`	Is Perfect Number
`number/is-armstrong`	Is Armstrong Number
`number/is-palindrome`	Is Palindrome Number
`number/collatz`	Collatz Sequence
`number/digital-root`	Digital Root
`number/sum-digits`	Sum Digits
`number/reverse`	Reverse Number
`number/count-digits`	Count Digits
`number/triangular`	Nth Triangular
`number/is-triangular`	Is Triangular
`number/square`	Nth Square
`number/cube`	Nth Cube
`number/is-power-of`	Is Power Of
`number/nearest-power`	Nearest Power

Agent Scenarios

Here's how real agents use these tools:

1. Report generation agent

A reporting agent converts numbers to ordinals (1st, 2nd, 3rd) for natural-sounding text.

Tool Call: number/ordinal

{ "number": 42 }

2. Legal document agent

A document agent converts dollar amounts to written words for legal contracts.

Tool Call: number/to-words

{ "number": 15750 }

3. Design system agent

A UI agent converts numbers to Roman numerals for chapter or section numbering.

Tool Call: number/to-roman

{ "number": 2026 }

MCP Setup

Add number tools to your agent in under 2 minutes. Choose your client:

Claude Desktop / Claude Code

Add this to your MCP config:

{
  "mcpServers": {
    "tinyfn-number": {
      "url": "https://api.tinyfn.io/mcp/number/",
      "headers": {
        "X-API-Key": "your-api-key"
      }
    }
  }
}

Cursor

Go to Settings > MCP and add a new server:

Type: SSE
URL: https://api.tinyfn.io/mcp/number/sse
Headers: X-API-Key: your-api-key

Tip: Use the category-specific endpoint (/mcp/number/) for the best experience. The all-in-one endpoint (/mcp/all/) works too but has 500+ tools which some clients handle less efficiently.

When to Use These Tools

Use number MCP tools when your agent needs to:

Guarantee correctness — when wrong answers have real consequences
Process user data — when you're operating on actual user input, not hypothetical examples
Maintain consistency — when the same input must always produce the same output

You don't need these tools for casual conversation or rough estimates. Use them when precision matters.

Ready to add number tools to your agent?

Get Free API Key 100 requests/month free. No credit card required.

Frequently Asked Questions

What number representations does TinyFn support?

TinyFn converts numbers to ordinals (1st, 2nd, 3rd), written words (one hundred twenty-three), Roman numerals, and various formatted representations.

What's the range for Roman numeral conversion?

TinyFn converts integers from 1 to 3999 (the standard range for Roman numerals using basic symbols I, V, X, L, C, D, M).

Does number-to-words handle decimals?

Yes. TinyFn can convert decimal numbers to words, handling both the integer and fractional parts.