Underthesea

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Underthesea is an open-source Agentic AI Toolkit that provides multi-provider AI Agent support and built-in Vietnamese NLP capabilities. It offers Python modules for natural language processing tasks.

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At a glance

Pricing

Open Source

Free tier

Yes

API

Yes

Skill level

Technical

About

What is underthesea?

Underthesea is an open-source Agentic AI Toolkit designed to facilitate the development of AI agents and Vietnamese Natural Language Processing applications. Since version 9.3.0, it offers multi-provider AI Agent support, allowing communication with LLM APIs like OpenAI, Azure OpenAI, Anthropic Claude, and Google Gemini using only Python's standard library, eliminating external dependencies. The toolkit includes 12 built-in tools such as a calculator, web search, and file I/O, and supports tool calling. For Vietnamese NLP, Underthesea provides a comprehensive suite of modules for tasks like word segmentation, POS tagging, named entity recognition, sentiment analysis, and translation. It also features multi-session orchestration and automatic tracing for agent calls.

Best used for

Ideal for developers and data scientists who need to build AI agents, integrate various LLM providers, and perform advanced Vietnamese Natural Language Processing. Especially valuable for creating intelligent systems that require robust text analysis and agentic behavior without heavy external dependencies.

Common actions

build AI agents

process Vietnamese text

integrate LLMs

automate NLP tasks

low-code/no-codeworkflowsdeepfakecollaborationopen-sourceautomated workflowgithub copilotface swapping"AI Agents"

Capabilities

Key features

Multi-provider AI agent support
Vietnamese NLP capabilities
12 built-in tools
Tool calling
Multi-session orchestration
Automatic agent tracing
Python stdlib LLM communication

Target Audience

developerdata scientist

Integrations

openaianthropicgoogle-geminilangfuse

Pricing & Plans

Open Source

Free

FAQs

What LLM providers does Underthesea support?

Underthesea supports multiple LLM providers including OpenAI, Azure OpenAI, Anthropic Claude, and Google Gemini. It communicates with these APIs using only Python's standard library, eliminating the need for additional external packages like `openai` or `anthropic`.

What Vietnamese NLP tasks can Underthesea perform?

Underthesea offers a comprehensive suite of Vietnamese NLP capabilities. These include sentence segmentation, text normalization, word segmentation, POS tagging, chunking, named entity recognition, text classification, sentiment analysis, language detection, dependency parsing, and translation.

Does Underthesea provide built-in tools for agents?

Yes, Underthesea comes with 12 built-in tools that agents can utilize. These include common functionalities like a calculator, datetime, web search, Wikipedia integration, file I/O operations, shell execution, and Python code execution, enhancing agent capabilities.

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