TinyFn

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streamable-httpMITupdated 2mo ago

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

Source Website Docs1

What can you do with TinyFn?

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>")` → `"<div>"`
`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

Verify your API key starts with tf_live_
Check that you're using the X-API-Key header (not Authorization)
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:

Free tier: 10 requests/minute, 100/month — upgrade at tinyfn.io
Starter: 100 requests/minute, 10,000/month
Check your current usage at tinyfn.io/dashboard

📚 Documentation & Resources

MCP Overview — Setup guide for all supported platforms
API Reference — REST API docs for direct HTTP usage
MCP Categories — Detailed breakdown of each server
Authentication — API key setup and management
Rate Limits — Quotas and limits per plan
LLM Context — llms.txt for AI-readable documentation

🤝 Support

📧 Email: support@tinyfn.io
🐛 Issues: GitHub Issues
💬 Sales: sales@tinyfn.io

📄 License

MIT License — see LICENSE for details.

Install

Add TinyFn to your client. Pick the one you use.

claude mcp add --transport http tinyfn https://api.tinyfn.io/mcp/all/

codex mcp add tinyfn --url https://api.tinyfn.io/mcp/all/

{
  "mcpServers": {
    "tinyfn": {
      "url": "https://api.tinyfn.io/mcp/all/"
    }
  }
}

Add to `~/.cursor/mcp.json`, or `.cursor/mcp.json` for a single project.

{
  "servers": {
    "tinyfn": {
      "type": "http",
      "url": "https://api.tinyfn.io/mcp/all/"
    }
  }
}

Add to `.vscode/mcp.json` in your workspace.

{
  "mcpServers": {
    "tinyfn": {
      "url": "https://api.tinyfn.io/mcp/all/"
    }
  }
}

Add to `claude_desktop_config.json`, then restart Claude Desktop.

{
  "mcpServers": {
    "tinyfn": {
      "serverUrl": "https://api.tinyfn.io/mcp/all/"
    }
  }
}

Add to `~/.codeium/windsurf/mcp_config.json`.

Versions	Published
1.0.2Latest	Jun 19, 2026
1.0.1	Jun 19, 2026
1.0.0	Jun 19, 2026