Weekly digest
Claude Code gets most of the attention this week. Claude Code v2.1.237, released on GitHub on August 20, adds a built-in Concise output style that leads with results and skips narration. The same release fixes prompt caching for sessions running through an LLM gateway or a custom base URL.
Two performance notes sit alongside it. Bun's garbage collector now waits until Claude Code is idle, and the perf note claims 2x less CPU at p99. Claude Desktop boots about 2x faster after a timer fix. Separately, the FT reports that Anthropic's strongest model is struggling to attract users while cheaper tools thrive.
Sessions running through an LLM gateway or a custom base URL get prompt caching fixed in Claude Code v2.1.237, and the same release adds a built-in Concise output style: Claude leads with results and skips preamble and narration, while doing the work just as thoroughly. Select it under Output style in /config. The release went out on GitHub on August 20.
Per a Claude Code announcement, a Concise output style keeps responses short, leading with the result and still giving full detail on request. Switch it on in /config → Output style, or set "outputStyle": "Concise" in settings.json.
AcBun's garbage collector waits for idle in Claude Code
Mid-turn, the CLI was losing CPU to its own runtime: Bun's garbage collector ran on a fixed timer, so it kicked in right when Claude Code was busiest. The GC now holds off until the process is idle, and the perf note claims 2x less CPU at p99.
The note doesn't name the Claude Code release carrying the change. Claude Code has run on the Rust port of Bun since v2.1.181, which shipped June 17.
Claude Code takes on UI design work through /design, a research preview skill that carries Claude Design's artboard workflow into the CLI and Desktop. Run the command to get editable artboards for your interface, pick one, tweak it, then have Claude implement it. The skill is built on artifacts.
Anthropic lists /design on the Pro, Max, Team, and Enterprise plans, and Claude Code has to be updated before the command shows up.
A new Anthropic cookbook pairs Claude Managed Agents with AG-UI, CopilotKit's open Agent-User Interaction Protocol, so one agent can drive many different front ends. The adapter maps each chat thread to a managed session and streams text, tool calls and thinking into the interface.
ClaudeDevs on Twitter points to the sample code, which sits in Anthropic's claude cookbook repository on GitHub.
Starting in the background used to throttle the app's timers and drop the JS engine into power-saving mode. Anthropic says it now boots at full speed even while the window's still hidden, ~2x faster than a month ago, along with smaller perf fixes.
Per unconfirmed reports, Anthropic is testing a Hub Mode that could let Claude coordinate multiple sub-agents and visualize their progress in one interface. The feature has not appeared in official documentation, and Anthropic hasn't confirmed the mode.
Free courses and tutorials on working with AI are live at academy.claude.com, with paths for people figuring out what AI is and for those already using Claude every day. Anthropic published a companion blog post on how it approaches teaching and learning AI and where Claude Academy sits in that.
According to the Financial Times, Anthropic's strongest AI model is struggling to attract users while cheaper tools thrive. The article sits behind the FT's paywall, and the visible text names neither the model nor the competing tools.
Bloomberg earlier reported preliminary second-quarter revenue above $11.5 billion for Anthropic, against $4.73 billion in the first quarter of 2026.
