500+ deterministic tools for AI agents, coding assistants, and your code. No more made-up calculations, guessed conversions, or invented validations.
math/multiply
{ "a": 47, "b": 83 }
{ "result": 3901 }
Your agent calls TinyFn tools instead of guessing.
User asks something that requires precise calculation, conversion, or validation.
Instead of hallucinating, the agent uses the right TinyFn tool via MCP.
TinyFn returns the deterministic result. Agent responds accurately.
Add TinyFn to Claude Desktop, Cursor, or any MCP client.
{
"mcpServers": {
"tinyfn": {
"url": "https://api.tinyfn.io/mcp/all/",
"headers": {
"X-API-Key": "your-api-key"
}
}
}
}Pick the tools you need, or use them all.
Prime checks, factorials, GCD, LCM, arithmetic
/mcp/math/
Count chars, reverse, slugify, case conversion
/mcp/string/
Temperature, length, weight, volume, data sizes
/mcp/convert/
Email, URL, phone, credit card, UUID
/mcp/validate/
SHA256, MD5, HMAC, bcrypt, CRC32
/mcp/hash/
Base64, URL, HTML, hex, JWT decode
/mcp/encode/
Timestamps, formatting, relative time, age
/mcp/datetime/
Convert between timezones, DST handling
/mcp/time/
Mean, median, mode, variance, percentiles
/mcp/stats/
One endpoint with all 500+ tools
/mcp/all/
Real problems that TinyFn solves.
"How many vowels?" "What's 17 x 23?"
LLMs frequently miscount and miscalculate. TinyFn provides exact results.
"Convert 98.6F to Celsius"
LLMs round wrong and use bad formulas. TinyFn uses precise factors.
"What time in Tokyo?" "Days until Dec 25?"
Timezone math is hard. TinyFn handles DST and leap years.
"Is this email valid?" "Valid UUID?"
LLMs guess at rules. TinyFn uses RFC-compliant validators.
"SHA256 of this?" "Base64 encode?"
LLMs can't compute hashes. TinyFn returns correct results.
"What's the median?" "Standard deviation?"
Stats require precision. TinyFn computes exact results.
Give your AI agents tools they can trust.
100 requests/month free. No credit card required.