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CHANGELOG.md

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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased

Added

  • LangChain Tools module (src/tools/)
    • ReceiptOCRTool - LangChain-compatible OCR tool
    • ReceiptExtractionTool - Information extraction tool
    • ReceiptClassificationTool - Receipt classification tool
  • LangChain Agent module (src/agents/)
    • create_receipt_agent() - Factory function for receipt processing agent
    • ReceiptAgentExecutor - High-level agent wrapper
  • AGENTS.md - AI-Native repository guide
  • README_EN.md - English version of README
  • CONTRIBUTING.md - Contribution guidelines
  • CODE_OF_CONDUCT.md - Community code of conduct
  • SECURITY.md - Security policy
  • .pre-commit-config.yaml - Pre-commit hooks configuration

Changed

  • Added language switcher links in README.md

0.2.0 - 2026-03-11

Added

  • Official langchain-paddleocr package integration
  • uv package manager support
  • LangChain compatibility layer (langchain_compat.py)
  • New environment variable PADDLEOCR_ACCESS_TOKEN
  • Seal extraction utility module (utils/seal_extractor.py)

Changed

  • Migrated from custom OCR implementation to PaddleOCRVLLoader
  • Improved dependency management with pyproject.toml
  • Updated documentation for new API configuration

Fixed

  • Import compatibility issues with langchain-paddleocr

0.1.0 - 2024-01-01

Added

  • Initial release
  • PaddleOCR-VL-1.5 OCR recognition
  • ERINE (Baidu LLM) integration for information extraction
  • Seal/stamp recognition feature
  • Support for multiple receipt types:
    • VAT Special Invoice (增值税专用发票)
    • VAT Normal Invoice (增值税普通发票)
    • Train Tickets (火车票)
    • Taxi Receipts (出租车票)
  • Gradio Web UI
  • CLI interface
  • Sample invoices for testing

Version History Summary

Version Date Highlights
0.2.0 2026-03-11 Official langchain-paddleocr integration, uv support
0.1.0 2024-01-01 Initial release with OCR, ERINE, seal recognition