System Zero

System Zero is a package manager designed to install autonomous, event-driven behaviors—referred to as modules—into code repositories. Unlike traditional package managers that install passive code, System Zero modules are persistent agents capable of observing repository state, responding to events, making decisions via large language model (LLM) calls, and acting on their environment. Each module maintains its own memory, triggers, and capabilities, allowing it to operate independently within the repository.

The platform introduces a standardized approach to managing these autonomous agents through protocols such as MCP for tool access, A2A for agent-to-agent communication, and S0 for repository behaviors. Modules follow a defined lifecycle: they wake up on a heartbeat or in response to events, read and update state, process events from a pub/sub bus, interact with LLMs using structured prompts and schema-validated responses, and emit new events before returning to a dormant state. This architecture supports dynamic reconfiguration; adding or removing modules automatically updates the system’s capability graph without complex manual configuration.

System Zero provides several universal interfaces to support module operation. These include a persistent memory store, an append-only event bus, vendor-agnostic LLM invocation with support for local CLIs and API providers (such as OpenAI, Anthropic, and Groq), guaranteed filesystem storage for modules, cron-style scheduling, live discovery and introspection of installed modules, and standard lifecycle hooks for installation, reconciliation, and health checks. Modules declare both their provided and required capabilities, and the system handles dependency resolution and wiring automatically.

Installation and initialization can be performed via a CLI tool available through curl, pipx, pip, or npm. Users can also absorb external repositories as new modules by extracting features through a constrained LLM call, which generates protocol-native modules complete with manifests and behavior contracts. 0 license. It is intended for developers seeking to enhance repositories with intelligent, persistent, and autonomous behaviors that can observe, decide, and act within a standardized framework.