> ## Documentation Index
> Fetch the complete documentation index at: https://bolt-builder-bolt-cli-5b0aab46-mintlify-90c6dff7.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Week of August 4, 2026

> Weekly Bolt changelog: GPT-5 reasoning effort scoped to supported variants, diff polish, TUI spinner restored, and background and test tools back.

## Updates

* **GPT-5 reasoning effort matches model version** — Reasoning effort tiers (including `none` and `xhigh`) are now offered only for the GPT-5 variants that support them, so `--variant` no longer surfaces options a given model would reject. See [Controlling reasoning effort](/concepts/providers-and-models#variant-controlling-reasoning-effort).
* **Diff annotation polish** — The session UI diff view tightens up comment indicators, gutter behavior, and light/dark syntax colors for better readability.

## Bug fixes

* **Toggle file selections off** — Clicking a file selection a second time now clears it, so you can undo a selection without picking a different one first.
* **Cleaner draft comment interactions** — Starting or dismissing a draft comment now clears the underlying selection consistently and no longer competes with hover state.
* **Animated reasoning header restored** — The reasoning header in the TUI shows an animated spinner again while thinking, and its gradient dims when expanded so the collapsed and open states are easier to tell apart.
* **Background process and test tools restored** — `bash_background`, `process_output`, `list_processes`, `kill_process`, and `test_run` are available to agents again after being dropped in an earlier merge. Agents can start long-running commands like dev servers and watchers, read their output, and run the project's tests with structured pass/fail results. See [Built-in tools](/concepts/tools#built-in-tools).