NPi AI (Natural-language Programming Interface, pronounced 'N π') is an open-source platform that provides Tool-use APIs enabling AI agents to interact with and control diverse software applications. It was launched in April 2024 (v0.0.1) as a free, open-source project with the stated mission of acting as 'the limbs for large language models' — giving agents the ability to take actions in the virtual world. The platform works through two core components: a Server that manages tool orchestration, and Toolkits that wrap individual applications. Developers use a CLI or Web Console to configure NPi, then integrate it into their agents using multi-language SDKs. The system supports OpenAI function calling, making it compatible with standard LLM agent workflows. NPi's design philosophy centers on in-app planning: breaking down complex tasks into discrete sub-tasks scoped to a single application, then executing them as a sequence of function calls. This provides more predictable, controllable agent behavior compared to open-ended multi-tool execution. The platform ships with pre-built integrations for applications including Google Calendar, GitHub, and Twitter/X, letting agents schedule events, manage repositories, and post on social platforms without custom API integration work. It is hosted on GitHub under the sheet0/npi repository and has an active documentation site at docs.npi.ai. Key features: - Tool-use API layer for LLMs to operate external software applications - Pre-built integrations with Google Calendar, GitHub, Twitter/X, and more - In-app planning that breaks tasks into sub-tasks executed as function calls - Multi-language SDKs for embedding tool-use into existing agent workflows - CLI and Web Console for configuring and managing toolkits - OpenAI function calling compatibility - Fully open-source (GitHub: sheet0/npi)
Free and open-source