How does the parser handle nested tags?

The parser uses an integer depth counter. When it encounters an opening tag, it increments the counter; when it finds a closing tag, it decrements it. This ensures that `extract_all_tags` correctly identifies fully closed pairs even in complex structures.

Can I use this to validate if my prompt output is well-formed?

Yes, by using the `validate_tag_integrity` tool, you can check if every opening tag has a corresponding closing tag and verify that the nesting depth is balanced.

What happens if a tag is not found?

If you use `extract_single_tag` and the target tag does not exist in the input string, the tool will return null for the extracted content.

LLM XML Tag Parser MCP Connector for Claude

A+

Extract and validate content within XML-style tags from LLM outputs.

3 tools Official Updated Oct 1, 2026 Official Vinkius Partner

More Details Connect to Claude

The LLM XML Tag Parser MCP server provides a deterministic way to parse structured data embedded in unstructured text. It is specifically designed for handling the output of models like Claude that use XML tags (e.g., , ) to separate reasoning from final responses. Using robust regex-based extraction and depth tracking, it can handle nested tags and verify structural integrity. You can use extract_single_tag to find specific blocks, extract_all_tags to retrieve all instances of a tag, or validate_tag_integrity to ensure your XML structure is balanced.

xmlregexparsingclaudestructured-data