Getting Started with the ant CLI: Deploy Claude Agents

This article was originally published on on April 8, 2026, and it's built specifically for developers who want to create, configure, and run cloud-hosted agents without writing wrapper code. The . I keep mine in a .env file that my shell sources on startup, but any secret management approach works.

Shell Completions

The ant CLI supports completions for bash, zsh, fish, and PowerShell. For zsh (the default macOS shell):

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# Generate zsh completions

ant completion zsh > ~/.zfunc/_ant



# Add to your .zshrc if not already there

echo 'fpath=(~/.zfunc $fpath)' >> ~/.zshrc

echo 'autoload -Uz compinit && compinit' >> ~/.zshrc

Tab completion saves a lot of time when working with the beta: namespaced commands, which can get long.

Core Concepts - Agents, Environments, and Sessions

Before you create anything, it helps to understand how the four core pieces fit together.

Agent - A versioned configuration defining the model, system prompt, tools, and MCP server connections. Think of it as a blueprint. Each update creates a new version, so you can roll back if needed.

Environment - A container template specifying pre-installed packages (pip, npm) and networking rules. Create it once, reference it by ID. Multiple sessions can share one environment config, but each gets its own isolated container.

Session - A running instance that pairs an agent with an environment. It has its own container, filesystem, and conversation history. Sessions are where the actual work happens.

Events - The communication protocol. You send user events (messages, interrupts, tool confirmations) and receive agent events (messages, tool calls, thinking). Everything is event-based and streamable.

The flow works like this: you create an agent (the what), create an environment (the where), start a session linking them together, and then communicate through events. Anthropic handles the container orchestration, tool execution, and conversation state. According to the , but the YAML workflow is what makes the CLI my preferred interface.

According to the .

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