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TinyFn

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streamable-httpMITupdated 2mo ago

🧮 Give your AI agent 500+ deterministic tools Stop hallucinating math. Start getting correct answers.

ソースウェブサイトドキュメント1

TinyFn で何ができる？

The Problem

LLMs are great at reasoning. They're terrible at math.

Ask any AI assistant to compute 17% of 4,847 and you'll get a confident, wrong answer. Ask it to validate an email with regex, generate a SHA-256 hash, or convert timezones — same story. LLMs hallucinate on deterministic tasks.

TinyFn is a Model Context Protocol (MCP) server that gives your AI assistant 500+ tools that always return the correct answer. Math, conversions, validations, hashing, date arithmetic — the boring stuff, done right.

🖥️ Works With Your Tools

TinyFn runs as a remote MCP server — no npx, no Docker, no local install. Just add the URL to your config.

Platform Tool Limit Recommended Setup Config Location
Claude Code 500+ (Tool Search) /mcp/all/ — use everything ~/.claude/settings.json
Claude Desktop ~100 tools 2–3 category servers ~/Library/Application Support/Claude/claude_desktop_config.json
Cursor ~40 tools 1–2 focused servers Cursor MCP settings
Windsurf ~40 tools 1–2 focused servers Windsurf MCP settings
Continue.dev Varies Category servers .continue/config.json
Any MCP Client Varies Match to your tool limit Client-specific

💡 Why category servers? Most AI clients limit the number of tools. TinyFn splits 500+ tools across 12 focused servers so you can pick exactly what you need.

✅ Example Queries That Just Work

Once connected, just ask your AI assistant in plain language:

Math & Numbers

  • ✅ "Is 7919 a prime number?"
  • ✅ "What's 17% of 4,847?"
  • ✅ "Calculate the factorial of 12"

Conversions

  • ✅ "Convert 72°F to Celsius"
  • ✅ "How many miles is 100 kilometers?"
  • ✅ "Convert #3B82F6 to RGB values"

Validation

  • ✅ "Is user@example.com a valid email address?"
  • ✅ "Validate this credit card number: 4111111111111111"
  • ✅ "Is 550e8400-e29b-41d4-a716-446655440000 a valid UUID?"

Encoding & Hashing

  • ✅ "Base64 encode 'Hello, World!'"
  • ✅ "Generate a SHA-256 hash of 'my-secret-string'"
  • ✅ "URL encode 'hello world & goodbye'"

Date & Time

  • ✅ "How many days between January 15 and March 22?"
  • ✅ "What's the current Unix timestamp?"
  • ✅ "Is 2024 a leap year?"

Generators

  • ✅ "Generate a UUID"
  • ✅ "Create a secure 20-character password"
  • ✅ "Roll 3 six-sided dice"

⚡ Quick Start

1. Get your free API key at tinyfn.io (takes 10 seconds)

2. Add TinyFn to your MCP client:

Claude Code

Claude Code supports Tool Search, so you can use the full server with all 500+ tools:

{
  "mcpServers": {
    "tinyfn": {
      "url": "https://api.tinyfn.io/mcp/all/",
      "headers": {
        "X-API-Key": "tf_live_YOUR_KEY_HERE"
      }
    }
  }
}

Add this to ~/.claude/settings.json or use claude mcp add.

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "tinyfn-math": {
      "url": "https://api.tinyfn.io/mcp/math/",
      "headers": {
        "X-API-Key": "tf_live_YOUR_KEY_HERE"
      }
    },
    "tinyfn-validate": {
      "url": "https://api.tinyfn.io/mcp/validate/",
      "headers": {
        "X-API-Key": "tf_live_YOUR_KEY_HERE"
      }
    }
  }
}

Tip: Claude Desktop supports ~100 tools. Add 2–3 category servers based on your workflow.

Cursor & Windsurf

These platforms have a ~40 tool limit. Pick 1–2 focused servers:

{
  "mcpServers": {
    "tinyfn-validate": {
      "url": "https://api.tinyfn.io/mcp/validate/",
      "headers": {
        "X-API-Key": "tf_live_YOUR_KEY_HERE"
      }
    }
  }
}

Recommended for Cursor/Windsurf: validate (15 tools), hash (18 tools), encode (20 tools), convert (42 tools).

Continue.dev

{
  "experimental": {
    "mcpServers": [
      {
        "name": "tinyfn-math",
        "url": "https://api.tinyfn.io/mcp/math/",
        "headers": {
          "X-API-Key": "tf_live_YOUR_KEY_HERE"
        }
      }
    ]
  }
}

3. Start asking questions. Your AI now has deterministic tools for math, conversions, validation, and more.

📡 Available MCP Servers

All servers use base URL https://api.tinyfn.io. Pick the categories you need:

Server Endpoint Tools What It Does
All /mcp/all/ 500+ Everything — best for Claude Code
Math /mcp/math/ 52 Arithmetic, trig, primes, factorials, comparisons
Convert /mcp/convert/ 42 Temperature, length, weight, volume, speed, data sizes
String /mcp/string/ 33 Case conversion, slugify, trim, word count, extraction
Datetime /mcp/datetime/ 24 Date parsing, formatting, diffs, timezones, leap years
Encode /mcp/encode/ 20 Base64, URL, HTML, hex, ROT13, morse, JWT decode
Hash /mcp/hash/ 18 MD5, SHA-256, SHA-512, HMAC, bcrypt, CRC32
Color /mcp/color/ 30 HEX/RGB/HSL conversion, gradients, contrast, palettes
Stats /mcp/stats/ 16 Mean, median, mode, std dev, percentiles, correlation
Validate /mcp/validate/ 15 Email, URL, phone, credit card, UUID, IP, JSON, dates
Finance /mcp/finance/ 15 Interest, loans, mortgage, ROI, margin, tip calculator
Generate /mcp/generate/ 15 UUIDs, passwords, random numbers, lorem ipsum, dice

⚠️ Important: All URLs must end with a trailing / or requests will return 404 errors.

🛠️ Tool Categories

Tool Description Example
add, subtract, multiply, divide Basic arithmetic add(17, 25) → 42
percentage Percentage calculation percentage(17, 4847) → 823.99
is_prime Primality testing is_prime(7919) → true
factorial Factorial calculation factorial(12) → 479001600
fibonacci Nth Fibonacci number fibonacci(10) → 55
gcd, lcm GCD and LCM gcd(48, 18) → 6
power, square_root Exponentiation square_root(144) → 12
sin, cos, tan Trigonometric functions sin(1.5708) → 1.0
log, log10, log2 Logarithms log10(1000) → 3
floor, ceil, round_number Rounding ceil(4.2) → 5
absolute_value, sign Number properties sign(-42) → -1
clamp, distance, hypotenuse Range & geometry hypotenuse(3, 4) → 5
Tool Description Example
reverse_string Reverse text reverse_string("hello") → "olleh"
uppercase, lowercase Case conversion uppercase("hello") → "HELLO"
camel_case, snake_case, kebab_case Naming conventions snake_case("helloWorld") → "hello_world"
slug URL-safe slugs slug("Hello World!") → "hello-world"
trim, pad Whitespace handling trim(" hi ") → "hi"
word_count, string_length Text metrics word_count("hello world") → 2
contains, starts_with, ends_with String matching contains("hello", "ell") → true
split, join Array operations split("a,b,c", ",") → ["a","b","c"]
extract_emails, extract_urls Content extraction Extract emails from text blocks
is_palindrome Palindrome check is_palindrome("racecar") → true
count_char, count_substring Character counting count_char("hello", "l") → 2
Tool Description Example
validate_email Email format validation validate_email("user@example.com") → true
validate_url URL format validation validate_url("https://tinyfn.io") → true
validate_phone Phone number validation validate_phone("+1-555-123-4567") → true
validate_credit_card Luhn algorithm check validate_credit_card("4111111111111111") → true
validate_uuid UUID format validation validate_uuid("550e8400-e29b-41d4-a716-446655440000") → true
validate_ip IPv4/IPv6 validation validate_ip("192.168.1.1") → true
validate_json JSON syntax validation validate_json('{"key": "value"}') → true
validate_date Date format validation validate_date("2024-02-29") → true
validate_hex Hex string validation validate_hex("1a2b3c") → true
validate_base64 Base64 validation validate_base64("SGVsbG8=") → true
Tool Description Example
celsius_to_fahrenheit Temperature celsius_to_fahrenheit(100) → 212
kilometers_to_miles Distance kilometers_to_miles(100) → 62.14
kilograms_to_pounds Weight kilograms_to_pounds(70) → 154.32
liters_to_gallons_us Volume liters_to_gallons_us(3.785) → 1.0
hex_to_rgb Color hex_to_rgb("#3B82F6") → {r:59, g:130, b:246}
decimal_to_binary Base conversion decimal_to_binary(42) → "101010"
bytes_to_human File sizes bytes_to_human(1073741824) → "1 GB"
mph_to_kph Speed mph_to_kph(60) → 96.56
inches_to_centimeters Length inches_to_centimeters(12) → 30.48
hours_to_minutes Time hours_to_minutes(2.5) → 150
Tool Description Example
hash_md5 MD5 hash hash_md5("hello") → "5d41402abc4b..."
hash_sha256 SHA-256 hash hash_sha256("hello") → "2cf24dba5fb0..."
hash_sha512 SHA-512 hash Full 128-char hex digest
hmac_sha256 HMAC signature Keyed hash authentication
hash_sha3_256, hash_sha3_512 SHA-3 family Modern hash algorithms
hash_blake2b, hash_blake2s BLAKE2 High-performance hashing
hash_crc32 CRC32 checksum Error detection codes
compare_hashes Timing-safe compare Constant-time hash comparison
identify_hash Hash identification Detect hash algorithm from string
Tool Description Example
base64_encode, base64_decode Base64 base64_encode("Hello") → "SGVsbG8="
url_encode, url_decode URL encoding url_encode("hello world") → "hello%20world"
html_encode, html_decode HTML entities html_encode("<div>") → "&lt;div&gt;"
hex_encode, hex_decode Hex encoding hex_encode("hi") → "6869"
jwt_decode JWT parsing Decode JWT payload (no verification)
rot13 ROT13 cipher rot13("hello") → "uryyb"
morse_encode, morse_decode Morse code morse_encode("SOS") → "... --- ..."
json_minify, json_prettify JSON formatting Minify or pretty-print JSON
Tool Description Example
get_now Current timestamp ISO 8601 timestamp
format_date, parse_date Date formatting Parse and format dates
date_diff Days between dates date_diff("2024-01-15", "2024-03-22") → 67 days
add_time, subtract_time Date arithmetic Add/subtract days, hours, minutes
convert_timezone Timezone conversion Convert between any IANA timezones
is_leap_year Leap year check is_leap_year(2024) → true
calculate_age Age from birthdate Calculate exact age
relative_time Relative formatting "2 hours ago", "in 3 days"
days_in_month Month length days_in_month(2, 2024) → 29
is_weekend Weekend check Check if a date falls on Sat/Sun
Tool Description Example
generate_uuid UUID v4 "550e8400-e29b-41d4-a716-446655440000"
generate_uuid_v7 UUID v7 (time-sortable) Timestamp-based UUIDs
generate_password Secure passwords Configurable length and character sets
random_number Random integers random_number(1, 100) → 42
random_string Random strings Configurable length and charset
generate_token API tokens Cryptographically secure tokens
generate_lorem Lorem ipsum Generate placeholder text
generate_color Random colors Random hex color codes
roll_dice Dice rolling roll_dice(3, 6) → [4, 2, 6]
flip_coin Coin flip "heads" or "tails"
shuffle_list Shuffle arrays Randomize array order
Tool Description Example
hex_to_hsl, hsl_to_hex Color space conversion Convert between formats
hex_to_rgb, rgb_to_hex RGB conversion hex_to_rgb("#FF5733") → {r:255,g:87,b:51}
lighten_color, darken_color Brightness adjustment Lighten/darken by percentage
complement_color Complementary colors Get the opposite color
triadic_colors, analogous_colors Color harmonies Generate color schemes
contrast_ratio WCAG contrast Check accessibility compliance
generate_gradient Gradient generation Generate color stops between two colors
generate_shades, generate_tints Shade/tint ramps Create monochromatic palettes
invert_color Color inversion Invert any hex color
blend_colors Color blending Mix two colors together
Tool Description Example
calculate_mean Arithmetic mean calculate_mean([10, 20, 30]) → 20
calculate_median Median value calculate_median([1, 3, 5, 7]) → 4
calculate_mode Most frequent value calculate_mode([1, 2, 2, 3]) → 2
calculate_variance Population variance Statistical variance
calculate_stddev Standard deviation Statistical spread
calculate_percentile Percentile calculation calculate_percentile([1..100], 95) → 95
calculate_quartiles Q1, Q2, Q3 Quartile boundaries
calculate_correlation Pearson correlation Correlation coefficient between datasets
calculate_zscore Z-score Standard score calculation
describe_data Summary statistics Full statistical description of a dataset
Tool Description Example
compound_interest Compound interest Calculate future value with compounding
simple_interest Simple interest Basic interest calculation
loan_payment Loan payments Monthly payment calculator
mortgage_calculator Mortgage Monthly mortgage with amortization
calculate_tip Tip calculator calculate_tip(85.50, 20) → $17.10
percentage_change Growth/decline percentage_change(100, 125) → 25%
calculate_markup, calculate_margin Pricing Markup and margin calculations
calculate_discount Discounts Price after discount
return_on_investment ROI Investment return percentage
rule_of_72 Doubling time Years to double an investment
break_even Break-even analysis Units needed to break even
Tool Description Example
calculate_bmi Body Mass Index calculate_bmi(70, 1.75) → 22.86
calculate_bmr Basal Metabolic Rate Daily calorie baseline
ideal_weight Ideal weight range Based on height and frame
heart_rate_zones Training zones Fat burn, cardio, peak zones
estimate_body_fat Body fat estimate Navy method estimation
daily_water_intake Water recommendation Based on weight and activity
calories_burned Exercise calories Calories for activity type and duration
calculate_macros Macro split Protein/carb/fat breakdown
sleep_cycles Sleep optimization Optimal wake times based on cycles
Tool Description Example
magic_8_ball Magic 8-Ball Random mystical answers
dad_joke Dad jokes Guaranteed groan
fortune_cookie Fortune cookies Random fortune messages
random_compliment Compliments Brighten someone's day
random_excuse Excuses Creative excuse generator
would_you_rather Would You Rather Random dilemmas
friendly_roast Friendly roasts Light-hearted roasts
random_trivia Trivia Random trivia facts
yes_no Yes/No oracle Random yes or no

🎯 Perfect For

  • AI-Assisted Development — Cursor and Windsurf users who need reliable math in their coding workflow
  • Data Analysis — Statistics, percentiles, and financial calculations without second-guessing
  • Content Creation — Word counts, slugification, and encoding when building with AI
  • DevOps & Security — Hash generation, UUID creation, and input validation
  • Education — Teach with tools that demonstrate correct mathematical results
  • API Development — Validate inputs, generate test data, and compute values during development

💰 Pricing

🔧 Troubleshooting

All MCP server URLs must end with a trailing slash /.

✅ https://api.tinyfn.io/mcp/math/
❌ https://api.tinyfn.io/mcp/math
  1. Verify your API key starts with tf_live_
  2. Check that you're using the X-API-Key header (not Authorization)
  3. Make sure your key is active at tinyfn.io/dashboard
{
  "headers": {
    "X-API-Key": "tf_live_YOUR_KEY_HERE"
  }
}

Your MCP client has a tool limit. Instead of /mcp/all/, use category-specific servers:

If you need... Use server Tools
Validation only /mcp/validate/ 15
Hashing only /mcp/hash/ 18
Encoding only /mcp/encode/ 20
Math only /mcp/math/ 52

See the full server list for all options.

You've hit your plan's rate limit. Options:

📚 Documentation & Resources

🤝 Support

📄 License

MIT License — see LICENSE for details.