# String Operations Engine MCP

> The String Operations Engine gives your AI deterministic control over text formatting. It calculates exact word and character counts, converts messy strings into precise programming casings (camelCase, slugify), and safely truncates large blocks of text. Stop relying on LLMs to guess metrics; use this server for reliable, programmatic string manipulation.

## Overview
- **Category:** productivity
- **Price:** Free
- **Tags:** string-manipulation, text-formatting, slugify, casing-conversion, text-truncation

## Description

Listen up. Large Language Models are great for spitting out natural-sounding text, sure. But when you need strict rules—like knowing exactly how many characters a headline has to be or converting a messy title into clean code—they fall apart. They guess metrics; they mess up casings. That's a huge headache whether you're building an API endpoint or optimizing for SEO limits. The String Operations Engine fixes that crap by giving your AI client deterministic control over text formatting. You stop relying on LLMs to just *guess* the numbers; you use this server for reliable, programmatic string manipulation.

This MCP Server handles all the mechanical parts of text processing: counting, converting, and cutting. It runs these strict tasks through a dedicated core, so you get predictable results every single time. Here's how it works:

**Format programmatically:** You can convert any garbage string into standard development casings using the `change_casing` tool. Need it in `camelCase`, maybe `PascalCase`, or maybe you gotta make some URL-friendly slugs? Just run it through this server. It handles all those common formats like `snake_case` and `kebab-case`. **The** `change_casing` tool takes whatever messy text you throw at it and spits out clean, perfectly cased results.

**Measure text dimensions:** When you need to know the exact count—the word count, the character count, or how many lines a block of copy spans—you use the `get_text_stats` tool. It calculates these figures precisely for any input text. You get the real numbers for words, characters, and line breaks without fail.

**Safely shorten strings:** If you've got huge blocks of text that need to be cut down but you don't wanna lose all context or break the data structure, the `truncate_text` tool is your man. It safely cuts a string right down to the length you specify. You can even tell it to tack on an optional suffix, like '...', so people know they ain't reading the whole thing.

You use **`get_text_stats`** to get 100% accurate word counts, character counts, and line counts for any text you provide.

You use **`change_casing`** to convert messy input into standard formats like `camelCase`, `PascalCase`, or URL-friendly slugs, guaranteeing correct programming casings every time.

You use **`truncate_text`** to cut strings to an exact length while preserving data integrity. You can even specify a suffix to append when it cuts the text.

This engine gives your AI client absolute control over string manipulation. It's pure utility for anyone—developers, content teams, or anyone who needs metrics that actually add up. Because this stuff runs locally, your sensitive text never leaves your machine.

## Tools

### change_casing
Converts text into specific programming casings like camelCase, PascalCase, snake_case, kebab-case, or URL slugs.

### get_text_stats
Calculates the exact word count, character count, and line count for any provided text.

### truncate_text
Safely cuts a string to a specified length, optionally appending a suffix like '...'.

## Prompt Examples

**Prompt:** 
```
I need a clean URL slug for this article title: '10 Secrets for Fast & Reliable Database Scaling!'.
```

**Response:** 
```
Using the change_casing tool (format='slugify'): The result is '10-secrets-for-fast-reliable-database-scaling'.
```

**Prompt:** 
```
Convert the text 'user account profile settings' into camelCase for my React component.
```

**Response:** 
```
Using the change_casing tool (format='camelcase'): The result is 'userAccountProfileSettings'.
```

**Prompt:** 
```
Count the exact number of characters in this SEO meta description to ensure it's under 160 chars.
```

**Response:** 
```
Using the get_text_stats tool: The text has 142 characters (120 without spaces) and exactly 23 words.
```

## Capabilities

### Format programmatically
Converts any arbitrary string into standard development casings (e.g., `camelCase`, `snake_case`) using the `change_casing` tool.

### Measure text dimensions
Calculates precise word, character, and line counts for a given block of text with the `get_text_stats` tool.

### Safely shorten strings
Truncates long text fields to a specified length using the `truncate_text` tool, allowing you to append an optional suffix.

## Use Cases

### Optimizing SEO Meta Descriptions
A content manager writes a meta description, but they aren't sure if it hits the 160-character limit. They ask their agent to run `get_text_stats`. The tool returns that the text is 158 characters long and contains exactly 24 words, confirming it fits perfectly without needing manual checks.

### Building a React Component Library
A developer has user-provided labels like 'product details view'. They need this to become a valid component prop name. Instead of guessing or using messy regex, they run the text through `change_casing` (format='camelcase'), which reliably returns 'productDetailsView'.

### Sanitizing Database Inputs
A user submits a massive bio field that exceeds the 500-character limit of the database. Before saving, the agent passes it to `truncate_text` with length=500 and suffix='...', ensuring the data fits while still marking where the cutoff happened.

### Creating Clean URLs from Titles
A technical writer has an article title like '2024 Guide to Advanced Web Development!'. To make it a clean URL slug, they use `change_casing` (format='slugify'). The tool returns the perfect '2024-guide-to-advanced-web-development'.

## Benefits

- **Never guess metrics again.** Use `get_text_stats` to get 100% exact word, character, and line counts. This is perfect for validating Twitter limits or SEO meta descriptions where accuracy matters.
- **Keep your code clean.** The `change_casing` tool guarantees you can convert any text into proper formats—like converting 'user profile name' to a valid `camelCase` variable name.
- **Prevent data loss on input.** If an API field has a 255-character limit, use `truncate_text` first. You control the cutoff point and can add a clean ellipsis suffix.
- **Run locally for privacy.** Since this server executes pure JavaScript code client-side, your proprietary text never leaves your machine or hits an external API.
- **Process complex variables.** The engine handles multiple casing formats—from `snake_case` for Python to `kebab-case` for URLs—so you don't need separate scripts for every language.

## How It Works

The bottom line is: you get reliable, predictable text metrics and formatting without relying on the AI model's internal guesswork.

1. Provide the raw text and specify the required operation (e.g., 'count words' or 'convert to slug') to your AI client.
2. Your agent routes the request through the appropriate tool—`get_text_stats`, `change_casing`, or `truncate_text`. 
3. The server executes the pure JavaScript function and returns a precise, measurable result (e.g., '142 characters' or 'userAccountName').

## Frequently Asked Questions

**How do I check if a long article title is suitable for an SEO slug using change_casing?**
Use `change_casing` and set the format to 'slugify'. The tool will convert messy characters, spaces, and capitalization into a clean, hyphenated URL string instantly.

**Can I use get_text_stats to check character limits for database fields?**
Yes. Run `get_text_stats` on the text data you plan to insert. It returns the exact character count, letting you verify if the string fits before it hits the database layer.

**What happens if I use truncate_text with an empty string?**
If you provide an empty input string, `truncate_text` will return an empty string. It's designed to be predictable even when the source data is null or empty.

**Is String Operations Engine reliable for coding variables?**
Yes. The server executes pure JavaScript logic via `change_casing`, which is deterministic and accurate for converting strings into standard formats like camelCase, making it perfect for code generation tasks.

**Does using get_text_stats send my private content to an external server?**
No, it runs entirely locally on your machine. This tool makes zero API calls and processes text data within your environment. Your proprietary information never leaves your client's memory.

**What happens if I give change_casing a non-string value?**
It throws a standard runtime error because the tool expects only string input. You must ensure the data you pass is text before calling 'change_casing' to prevent execution failure.

**Are there any performance or rate limit concerns when using truncate_text many times?**
Since this engine runs locally, it doesn't adhere to external API rate limits. Performance is limited only by your client machine's CPU speed and the sheer volume of text you are processing.

**Does change_casing correctly handle non-Latin or Unicode characters?**
Yes, because it relies on a pure JavaScript core, 'change_casing' handles complex Unicode character sets. You can safely convert titles containing accents (like é) into standard programmatic formats.

**Why use an MCP just to count words?**
Because LLMs process tokens, not individual letters or words. If you ask an LLM to generate exactly 250 characters, it will guess and often fail. This MCP provides a deterministic mathematical check to guarantee exact limits.

**Does the slugify tool handle international accents?**
Yes! The slugify logic decomposes strings (NFD normalization) to strip out all diacritics (like á, ö, ç) before converting spaces to hyphens and removing non-alphanumeric characters.

**Does it require internet access?**
No. The entire engine executes purely on local JavaScript without any API requests, guaranteeing total privacy for your source code and content.