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a2a is the official command-line interface for A2A (Agent-to-Agent) compatible agents, published by a2aproject. The software serves as a terminal-based tool designed for working with agents that conform to the A2A standard, providing users with a single, officially maintained entry point for interacting with such agents directly from the command line. As the official CLI for the A2A ecosystem, it is positioned as the reference client utility for developers and operators who build, test, or otherwise engage with A2A-compatible agent implementations, making it a natural fit within developer tooling and agent interoperability categories. Its purpose centers on bridging the gap between a user's local environment and A2A-compatible agents, allowing command-line-driven workflows rather than requiring a graphical interface or custom integration code for routine agent interactions. Typical use cases include developers experimenting with A2A-compatible agents during development, users who prefer scripted or terminal-based workflows, and anyone needing an official, standardized way to communicate with agents that implement the A2A specification. Because it is maintained by a2aproject, the CLI aligns with the direction of the A2A project itself, offering assurance of compatibility with the standard it supports. The current version of the software is 0.2.0, which reflects its early-stage release numbering, and the catalog lists three published versions in total, indicating that the project has shipped multiple iterations beyond its initial release and continues to be actively versioned. Users evaluating the tool can therefore choose among the available releases, with version 0.2.0 representing the latest of the three. In summary, a2a is a purpose-built, officially supported command-line client for the A2A agent ecosystem, published by a2aproject, currently at version 0.2.0, and suited to developers and technical users who work with A2A-compatible agents and prefer terminal-based tooling.
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