MSchunker – Intelligent Text Chunking for LLMs

MSchunker is a lightweight, structure-aware, deterministic text chunker designed for modern LLM pipelines.

It transforms long documents into LLM-ready chunks while preserving semantic boundaries and natural writing structure.
Optimized for:

• Retrieval-Augmented Generation (RAG)
• Question Answering (QA)
• Summarization
• Memory systems
• Any workflow requiring precise text segmentation

MSchunker respects document structure (sections → paragraphs → sentences) and provides rich metadata, task-aware defaults, and optional token overlap for cross-chunk continuity.

🔗 Links
• PyPI: https://pypi.org/project/mschunker/
• GitHub: https://github.com/cspnms/MSchunker

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Features

• Structure-aware splitting
  • Detects headings, sections, paragraphs, and sentences
• Token / character limits
  • Enforces max_tokens and/or max_chars
• Hierarchical strategy
  • Paragraphs → sentences → hard-split fallback
• Optional token overlap
  • Adds context continuity across chunks
• Rich metadata
  • Section index, paragraph indices, sentence indices, split reasons
• Deterministic output
  • Same input + same settings → identical chunks
• Lightweight
  • No heavy NLP / ML dependencies
• Clean API
  • chunk_text() function
  • Chunker class for stateful use

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Installation

From PyPI:

pip install mschunker

Or latest version from GitHub:

pip install git+https://github.com/cspnms/MSchunker.git


⸻

##  QuikStart

from mschunker import chunk_text

text = "... your long document ..."

chunks = chunk_text(
    text,
    max_tokens=512,
    overlap_tokens=64,
    strategy="auto",
    task="rag",
)

for ch in chunks:
    print("---- CHUNK ----")
    print(ch.text[:200], "...")
    print(ch.meta)


⸻

##  API Reference

### chunk_text(...)

Main function:

chunks = chunk_text(
    text: str,
    max_tokens: int | None = 512,
    max_chars: int | None = None,
    overlap_tokens: int = 64,
    strategy: str = "auto",          # or "fixed"
    token_counter: callable | None = None,
    source_id: str | None = None,
    task: str | None = None,         # rag | qa | summarization | memory
)

Returns: List[Chunk]

⸻

### Chunker — Stateful Wrapper

from mschunker import Chunker

c = Chunker(
    max_tokens=512,
    overlap_tokens=64,
    strategy="auto",
    task="rag",
)

chunks = c.chunk(text, source_id="doc-1")


⸻

##  Chunk Data Model

Each Chunk contains:
	•	.text — the chunk content
	•	.meta — metadata including:
	•	section_index
	•	section_heading
	•	paragraph_indices
	•	sentence_indices
	•	split_reason
	•	strategy
	•	chunk_index
	•	overlap_from_prev
	•	overlap_tokens
	•	source_id

⸻

##  Utilities

### analyze_chunks(chunks)

from mschunker import analyze_chunks

stats = analyze_chunks(chunks)
print(stats)

Example:

{
  "num_chunks": 12,
  "min_tokens": 118,
  "max_tokens": 482,
  "avg_tokens": 311.9
}


⸻

### explain_chunk(chunk)

from mschunker import explain_chunk

print(explain_chunk(chunks[0]))

Example result:

Strategy: auto | Split reason: paragraph_boundary |
Section #0 heading='Introduction' |
Paragraphs: (0, 1) | Chunk index: 0


⸻

##  How MSchunker Works

MSchunker uses a hierarchical, structure-preserving algorithm:
	1.	Sections / Headings
	2.	Paragraphs
	3.	Sentences
	4.	Hard splits (fallback)

This ensures chunks remain coherent and optimized for LLM input.

overlap_tokens adds cross-chunk continuity—ideal for RAG or QA systems.

⸻

##  License

MIT License © 2025 MS

⸻

##  Contributing

Issues and pull requests are welcome.
MSchunker is designed to evolve into a fully intelligent, future-proof chunking engine.