Summary
This gives Claude five focused string operations: analyze_string returns readability metrics like Flesch-Kincaid scores and word frequency, transform_string handles extraction and masking of emails, URLs, and phone numbers plus whitespace cleanup, diff_strings compares text at character, word, or line level, render_template processes mustache-style variables with conditionals and loops, and generate_slug creates URL-friendly identifiers with transliteration. Reach for this when you need text analysis beyond basic manipulation, especially for content processing pipelines where you want readability assessment, structured diffs, or template rendering without pulling in separate libraries for each task.
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Advanced string manipulation tools for AI agents, served over the Model Context Protocol (MCP).
Tools
analyze_string
Analyze text to get detailed metrics:
- Character count (with and without spaces)
- Word, sentence, and paragraph counts
- Estimated reading time
- Flesch-Kincaid reading level score and grade
- Unique word count and most common words
- Longest word
transform_string
Transform text with various operations:
- remove_duplicate_lines - Remove duplicate lines from text
- remove_extra_whitespace - Collapse extra whitespace and blank lines
- extract_emails - Extract all email addresses from text
- extract_urls - Extract all URLs from text
- extract_phone_numbers - Extract phone numbers from text
- mask_sensitive_data - Mask emails, phone numbers, and credit card numbers
- truncate - Truncate text with ellipsis at word boundaries
- wrap_text - Wrap text at a specified column width
diff_strings
Compare two strings and see the differences:
- character mode - Character-by-character diff
- word mode - Word-by-word diff (default)
- line mode - Line-by-line diff
- Shows additions, deletions, and unchanged segments with positions
render_template
Simple template engine:
- Replace
{{variables}}with values from a JSON data object - Conditionals:
{{#if var}}...{{#else}}...{{/if}} - Loops:
{{#each arr}}...{{this}}...{{@index}}...{{/each}} - Nested property access:
{{user.name}}
generate_slug
Generate URL-friendly slugs:
- Transliterates accented characters (e.g.,
cafefromcafe) - Removes special characters
- Configurable separator (default:
-) - Optional max length with clean truncation
- Optional lowercase toggle
Setup
npm install
npm run build
Usage with Claude Desktop
Add to your claude_desktop_config.json:
{
"mcpServers": {
"string-tools": {
"command": "node",
"args": ["D:/products/mcp-servers/mcp-string-tools/dist/index.js"]
}
}
}
License
MIT
Featured
Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Free an open-source skills that make AI coding agents easier to understand, verify, and control.
Download for free →Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →