What Is Grok Build 1.0.4? The Agent CLI Update

Meet Grok Build 1.0.4, the Agent CLI Update With a StopCancelled Hook and Domain-Filtered Web Search

Grok Build 1.0.4 is a point release of the Grok Build agent CLI that adds a StopCancelled hook for reporting early turn endings, allow/exclude web-search domain lists, and a GROK_SESSION_ID environment variable for tools and MCP servers. It was surfaced on August 13, 2026 through community posts on X and has not been accompanied by an official release note in the sources available so far. The changes are developer-facing: turn control, tool-input rewriting, domain filtering, and text-selection improvements in the terminal UI.

Key Takeaways

• Grok Build 1.0.4 was reported on August 13, 2026 via a post crediting an xAI-linked account, with no official release note yet published.
• A new StopCancelled hook fires when a turn ends early — on interrupt, permission reject, or max-turns.
• Web search now reads allow/exclude domain lists from config.toml.
• Tools and MCP servers receive a new GROK_SESSION_ID environment variable.
• The /session-info tab gains drag-to-select and copy, with double-click word and triple-click paragraph selection.
• All feature details rest on a single community source and are not independently corroborated.

What Is Grok Build 1.0.4?

Grok Build 1.0.4 is an incremental release of Grok Build, an agent-style command-line tool associated with xAI's Grok ecosystem. It targets developers who run autonomous or semi-autonomous coding sessions, not chat users. The 1.0.4 designation marks a patch-level update focused on hooks, tool integration, and terminal usability rather than a new underlying model.

The release surfaced on August 13, 2026 in a post from Mark Kretschmann, who listed the feature set and credited the "@SpaceXAI" account. A second developer, @stevederico, reported an overlapping feature list the same day. Both are single-source reports. As of August 13, 2026, there is no official account confirmation, no published release notes, and no stated release date in the sources reviewed here.

Grok Build 1.0.4 is a developer tool, not a language model. That distinction matters for anyone arriving from a search for a Grok chat version.

Grok Build 1.0.4 at a Glance

Attribute	Detail
Developer	xAI (reported; credited via "@SpaceXAI" in the source post)
Type	Agent / coding CLI tool
Version	1.0.4 (point release)
Interface	Command line, with a /session-info tab
Key surfaces	Hooks, MCP servers, web search, config.toml
Config file	config.toml
Pricing	Not yet confirmed
Availability	Not yet confirmed
Official release notes	Not yet published in available sources
License	Not yet confirmed

How Grok Build 1.0.4 Works / What Makes It Different

The reported changes cluster around turn lifecycle control. The headline addition is the StopCancelled hook, which reports when a turn ends early — the source lists interrupt, permission reject, and max-turns as triggers. This gives an agent a defined signal when it stops before finishing, instead of ending silently.

A companion mechanism, reported by @stevederico, is steer: a follow-up setting that lets queued messages fire as interjections instead of waiting for the current turn to finish. The source describes queued messages being sent "without ending the turn," which changes how mid-task instructions land.

Tool handling gets its own hook. PreToolUse, per the same report, can rewrite a tool's input before execution. That turns the pre-execution step into an interception point rather than a passive gate.

Two more anchors round out the release. Web search adds allow/exclude domain lists read from config.toml, giving the agent a scoped source set. And tools and MCP servers now receive a GROK_SESSION_ID environment variable, so external processes can identify the active session.

Terminal usability also improved: the /session-info tab supports drag-to-select and copy (with c/y shortcuts), double-click selects a word, and triple-click selects a whole paragraph. The session search index can be fully disabled. These are quality-of-life changes on top of the hook and tooling work. All of the above rests on single-source community reports and is unconfirmed by an official note.

What You Can Do With Grok Build 1.0.4

The reported features map to concrete agent workflows. With the StopCancelled hook, a developer can log or react whenever a turn dies early, which helps debug interrupted automation runs. One community reader summarized the appeal plainly: "I love the attention to detail" — though that post drew 0 likes and 11 views, so broad sentiment is thin.

Domain filtering via config.toml lets you keep web search inside a trusted source set, useful for research agents that must avoid low-quality domains. The GROK_SESSION_ID variable lets custom tools and MCP servers tie their actions to a specific session, which matters for logging and multi-session setups. The steer interjection setting lets you correct a running agent mid-turn instead of waiting for it to stop.

If you want to compare how xAI's underlying models behave in an agent loop, the Grok 4.6 chat model gives a reference point for the reasoning side, separate from the CLI tooling described here. For prior context on xAI's release cadence, see our earlier writeup on Grok 4.3 and the Grok Build surge.

Availability: How to Access Grok Build 1.0.4

Access details for Grok Build 1.0.4 are not yet confirmed. The release was surfaced through community posts on X, not through an official announcement in the sources available. There is no stated platform support, rollout scope, or pricing as of August 13, 2026.

For authoritative install and upgrade instructions, developers should check xAI's official Grok Build documentation and release channels directly once notes are published. Until then, feature claims should be treated as reported, not verified.

What We Don't Know Yet

Several core questions remain open as of August 13, 2026:

• Official confirmation. No xAI account confirmation or published release notes appear in the available sources.
• Release date. No exact release date is stated; the report is dated August 13, 2026.
• Availability and pricing. Platform support, rollout scope, and any cost are unstated.
• Adoption and benchmarks. No hands-on benchmarks or broader tester feedback appear in the retrieved posts. Community signal is very light.
• Corroboration. All feature details rest on one source and are not independently verified here.

Frequently Asked Questions

What is Grok Build 1.0.4?

Grok Build 1.0.4 is a point release of the Grok Build agent CLI, reported on August 13, 2026, that adds a StopCancelled hook, allow/exclude web-search domain lists, a GROK_SESSION_ID environment variable, and text-selection features on the session-info tab. The details come from a single community report and are not yet confirmed by an official release note.

Is Grok Build 1.0.4 officially released?

As of August 13, 2026, Grok Build 1.0.4 has no official account confirmation, published release notes, or stated release date in the sources available. All feature details rest on one community post and are not independently corroborated.

What is the StopCancelled hook in Grok Build 1.0.4?

The StopCancelled hook in Grok Build 1.0.4 reports when a turn ends early, such as on an interrupt, a permission rejection, or hitting the max-turns limit. It is one of several new lifecycle hooks reported in the release.

Can Grok Build 1.0.4 restrict which websites it searches?

Yes, Grok Build 1.0.4 lets web search use allow or exclude domain lists configured through config.toml, according to the community report. This gives developers control over which sources the agent can pull from.

What is the GROK_SESSION_ID environment variable?

GROK_SESSION_ID is a new environment variable that Grok Build 1.0.4 exposes to tools and MCP servers, according to the reported feature list. It lets external tools identify the active session they are running under.

How do you access Grok Build 1.0.4?

Access paths for Grok Build 1.0.4 are not yet confirmed in the available sources. The release was surfaced through community posts on X and should be verified against xAI's official Grok Build channels once release notes appear.

Is Grok Build 1.0.4 the same as the Grok chat model?

No, Grok Build 1.0.4 is an agent CLI tool with developer features like hooks, MCP integration, and session controls, not a version of the Grok large language model. It is a coding and agent runtime rather than a chat model.

What to Watch Next

Three signals will confirm or revise this page. First, an official xAI release note or changelog for Grok Build 1.0.4, which would move the feature list from reported to confirmed. Second, independent hands-on reports on the StopCancelled and PreToolUse hooks, since current coverage rests on one source. Third, any statement of availability, platform support, or pricing, all of which remain unstated. For deeper background on the models behind this tooling, our Grok 4.5 leak analysis tracks the foundation side of xAI's stack.

Building similar agent and chat workflows? On kie.ai you can try Grok 4.6, Grok 4.5, and Claude Opus 5.