Grok Build 1.0.50 brings safer worktrees, clearer permissions and sturdier sessions

xAI’s Grok Build 1.0.50, dated 6 October, makes a substantial set of changes to its coding agent, from safer file and worktree handling to clearer permission prompts. For developers using Grok Build, this is a practical reliability release, not just a fresh coat of command-line paint.

xAI Watch analysis

What happened

The Grok Build changelog lists dozens of changes in version 1.0.50. The most useful cluster is about preventing avoidable damage and making the agent’s actions easier to understand: failed writes preserve the previous file, worktree operations handle more edge cases, and shell permission decisions now prompt or approve commands according to the permission manager.

Our top picks

• Failed writes preserve existing files
  A failed file write now leaves the previous contents intact instead of replacing them with an empty file.
• Worktree removal gets safer
  Removing an in-use worktree without -f now refuses, and removal by label refuses when that label exists in multiple repositories.
• Permission rules are more resilient
  A malformed entry no longer wipes valid rules in the same section, while managed permission files retain their valid rules if one key is bad.
• Shell approvals are clearer
  Shell permission decisions can prompt for or approve commands that match the permission manager.
• Cancelled tool calls are labelled accurately
  Unanswered calls are marked cancelled rather than being shown as successful.
• Long sessions stay connected
  Sessions remain connected when the conversation exceeds 4 MiB.
• Retries can rescue a turn
  A stalled model call is retried before the turn fails, and incomplete Chat Completions streams are retried rather than returned as partial output.
• Large web fetches are checked early
  webfetch rejects an oversized file before downloading it into memory.

Why it matters

Coding agents can touch files, run commands and manage multiple worktrees. A small failure in any of those jobs can cost more than a slightly clumsy interface. Preserving a file after a failed write and refusing an ambiguous worktree deletion are meaningful guardrails, while clearer permission handling helps users see where human approval still applies.

The changelog also points to more dependable long-running sessions and fewer confusing failure states. These are xAI’s documented changes, not a guarantee that every edge case has vanished; still, reliability work is welcome when the tool is allowed near a real repository.

Our read

This is a strong maintenance release with a handful of changes that matter more than their modest descriptions suggest. If you use Grok Build, the worktree and file-write protections are good reasons to update, and the permission changes are worth understanding before letting it run commands. “The agent probably meant well” remains a poor recovery plan.

What to watch

• Whether users report fewer file and worktree mishaps in day-to-day use.
• How the revised permission prompts behave with existing rules and settings.
• Whether the retry changes reduce failed or incomplete sessions.

Discussion spark: Which safeguard matters most when an AI coding agent works in your repository: protecting files, controlling shell permissions, or keeping sessions reliable?

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