QueryCraft is a Python-based prompt engineering toolkit designed to streamline the development of AI agents. It enables users to define structured prompts through a modular pipeline, connect seamlessly to multiple LLM APIs, and conduct automated evaluations against custom metrics. With built-in logging of token usage and costs, developers can measure performance, compare prompt variations, and identify inefficiencies. QueryCraft also includes debugging tools to inspect model outputs, visualize workflow steps, and benchmark across different models. Its CLI and SDK interfaces allow integration into CI/CD pipelines, supporting rapid iteration and collaboration. By providing a comprehensive environment for prompt design, testing, and optimization, QueryCraft helps teams deliver more accurate, efficient, and cost-effective AI agent solutions.

LlamaIndex is a developer-focused Python library designed to bridge the gap between large language models and private or domain-specific data. It offers multiple index types—such as vector, tree, and keyword indices—along with adapters for databases, file systems, and web APIs. The framework includes tools for slicing documents into nodes, embedding those nodes via popular embedding models, and performing smart retrieval to supply context to an LLM. With built-in caching, query schemas, and node management, LlamaIndex streamlines building retrieval-augmented generation, enabling highly accurate, context-rich responses in applications like chatbots, QA services, and analytics pipelines.

LLMLing Agent is a modular framework for building, configuring, and deploying AI agents powered by large language models. Users can instantiate multiple agent roles, connect external tools or APIs, manage conversational memory, and orchestrate complex workflows. The platform includes a browser-based playground that visualizes agent interactions, logs message history, and allows real-time adjustments. With a Python SDK, developers can script custom behaviors, integrate vector databases, and extend the system through plugins. LLMLing Agent streamlines creation of chatbots, data analysis bots, and automated assistants by providing reusable components and clear abstractions for multi-agent collaboration.