Claude Code v2.1.181: Inline /config Syntax and Bun 1.4 Upgrade

Anthropic

Tools official 1 src. ~1 min

Claude Code v2.1.181 (June 17, 2026) adds `/config key=value` syntax for setting any configuration option inline, a CLAUDE_CLIENT_PRESENCE_FILE env var to suppress mobile push notifications, and upgrades the bundled Bun runtime to 1.4. Streaming of long paragraphs is now line-by-line. Fixes include truncated file writes on network drives, prompt caching with custom ANTHROPIC_BASE_URL, and macOS sandbox entitlement issues.

Why it matters

The inline /config syntax reduces friction for toggling model parameters mid-session. The network-drive write fix addresses a data-loss bug affecting users on NFS/SMB mounts.

Importance: 2/5

Minor version update with QoL improvements and a notable data-loss bug fix for network drives.

claude-code coding-agent cli anthropic release

Sources

official Claude Code v2.1.181 release notes