A2A CLI: Official Terminal Tool for the Agent2Agent Protocol

Repositorya2aproject/a2a-cliTool

The A2A CLI is a Go-based command-line client designed to interact with Agent2Agent (A2A) agents. It provides a standardised way to discover, message, and manage AI agents directly from the terminal without throwaway scripts.

Key points

  1. Consistent interface: Eliminates the need for custom scripts and raw JSON parsing when communicating with A2A agents.
  2. Automatic transport negotiation: Handles JSON-RPC, REST, and gRPC based on the target agent's published card.
  3. Comprehensive interaction: Supports retrieving agent cards, sending messages, streaming updates, and listing or cancelling tasks.
  4. Automation and CI ready: Features protocol-native JSON output (-o json) and predictable exit codes without requiring language-specific client libraries.
  5. Agent delegation: Includes bundled skill descriptors enabling AI coding agents to delegate tasks to A2A agents directly.

Why it matters

Inter-agent communication often suffers from fragmented transport protocols and payload formats. A2A CLI streamlines terminal inspection and automated agent orchestration by providing a unified client layer across different backends.

Analysis

Aimed at developers, automation engineers, and agent harness maintainers, the project is written in Go and distributed via Homebrew, WinGet, and prebuilt binaries. With 116 stars and 8 forks, it represents an emerging, well-organised open-source utility under active development.

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Summary generated by AI (Gemini 3.8 Flash, 27 September 2026). It may contain errors – the original source is authoritative.

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