Claude Code v2.1.199 Fixes Sub-Agent & Daemon Stability
Decision Brief
What changedClaude Code v2.1.199 fixes sub-agent error handling, background daemon crashes, and SSL error prompts, improving stability.
Why it mattersSub-agents no longer fail silently on rate limits or server errors, partial output is preserved, and long-running automated tasks are more reliable.
Who should careAgent builders, AI coding tool users
Affected stackClaude Code
Builder actionUpgrade
Source confidenceHigh · Official release / blog / repo
This update fixes sub-agents that silently failed on rate limits or server errors; now they return partial work or report errors to the parent agent. The background agent daemon on Linux no longer crashes every 50 seconds due to a dirty shutdown bug. Low memory prompts are improved, SSL certificate errors no longer exhaust retries (instead showing immediate fix prompts), and streaming responses encountering API overload preserve already outputted content marked as incomplete. Other fixes include stuck background task progress indicators, collapsed sub-agent panels, and broken config file backups.
Summary basis: official / RSS sourceUnless it says 'full article read', this summary is based only on publicly available content — it never pretends to have read restricted originals.
Sources
- Claude Code（GitHub Releases）
Claude Code release notes: new features, hooks, skills, and agent capabilities.
- Claude Code（GitHub Releases）