MCP Character Tools

Name: MCP Character Tools
Author: Aaryan-Kapoor

NPM Version TypeScript MCP License

The last thing you need for your LLM to work with individual characters or count the number of r's in a word. This is an MCP server providing 14+ comprehensive (and pretty) character and text analysis tools to help LLMs work with individual characters - something they struggle with due to tokenization.

See the Difference

Without MCP (Wrong)	With MCP (Correct)

Claims there are 2 r's in "garlic"	Correctly identifies 1 r in "garlic"

Why This Exists

First of all, why not? Second, Large Language Models tokenize text into subwords, not individual characters. For example, "strawberry" might become tokens like ["straw", "berry"], so the model never truly "sees" individual letters. This MCP server gives LLMs "character-level vision" through a suite of tools.

Installation

Via npx (recommended)

npx mcp-character-tools

Via npm (global install)

npm install -g mcp-character-tools mcp-character-tools

From source

git clone https://github.com/Aaryan-Kapoor/mcp-character-tools cd mcp-character-tools npm install npm run build npm start

Usage with Claude Desktop

Add to your Claude Desktop configuration (claude_desktop_config.json):

{ "mcpServers": { "char-tools": { "command": "npx", "args": ["mcp-character-tools"] } } }

All Tools Reference

See sample_outputs.md for complete examples with inputs and outputs for all 14+ tools.

Tool	Description
`count_letter`	Count a specific letter
`count_letters`	Count multiple letters at once
`count_substring`	Count substring occurrences
`letter_frequency`	Get frequency distribution
`spell_word`	Break into characters
`char_at`	Get character at index
`nth_character`	Get nth character (1-based)
`word_length`	Get exact length
`reverse_text`	Reverse text, detect palindromes
`compare_texts`	Compare two texts
`analyze_sentence`	Word-by-word breakdown
`batch_count`	Count across multiple words
`get_tricky_words`	List commonly miscounted words
`check_tricky_word`	Check if word is tricky

Development

# Install dependencies npm install # Build npm run build # Run tests npm test # Run tests with coverage npm run test:coverage # Development mode with auto-rebuild npm run dev