char-index-mcp

A Model Context Protocol (MCP) server providing character-level index-based string manipulation. Perfect for test code generation where precise character positioning matters.

[](https://smithery.ai/server/char-index-mcp) [](https://opensource.org/licenses/MIT) [](https://pypi.org/project/char-index-mcp/) [](https://pypi.org/project/char-index-mcp/)

> This project was created with Claude AI.

LLMs generate text token-by-token and struggle with exact character counting. When generating test code with specific length requirements or validating string positions, you need precise index-based tools. This MCP server solves that problem.

• find_nth_char - Find nth occurrence of a character
• find_all_char_indices - Find all indices of a character
• find_nth_substring - Find nth occurrence of a substring
• find_all_substring_indices - Find all occurrences of a substring

• split_at_indices - Split string at multiple positions

• insert_at_index - Insert text at specific position
• delete_range - Delete characters in range
• replace_range - Replace range with new text

• find_regex_matches - Find regex pattern matches with positions
• extract_between_markers - Extract text between two markers
• count_chars - Character statistics (total, letters, digits, etc.)

• extract_substrings - Extract one or more substrings (unified tool)

No installation required! Just configure and run:

# Test it works
uvx char-ind