WHY users should care
Two default behavior changes that could silently break existing agentic workflows:
- Subagents now capped at 20 concurrent by default — previously unbounded. Set CLAUDE_CODE_MAX_CONCURRENT_SUBAGENTS to override.
- Nested subagent spawning disabled by default — subagents no longer spawn child subagents unless CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH is set.
If you have workflows that fan out lots of background agents or use multi-level agent hierarchies, test before upgrading.
Other notable changes
- iOS Simulator pane is now first-class in Desktop (no computer use needed)
- Search results with citations are GA — no more beta header required (except Haiku 3)
- MCP memory leak fixed — truncated tool outputs were holding full results in memory for the entire session
- Corporate mTLS/proxy/OAuth settings now apply in Claude Desktop — were silently ignored before
- Windows auto-update fixed — failed updates no longer nuke claude.exe
- CLAUDE.md brace expansion now budget-bounded — pathological brace groups could OOM at startup
- --max-budget-usd now enforces on background subagents
- Desktop preview url field — open preview at specific HTTPS localhost address
- Managed Agents SDK: TypeScript, Go, C#, Java, PHP, Ruby examples added
Source
PR: https://github.com/anthropics/claude-code-docs/pull/1080
Triaged by day-shift claude-yolo 💤
WHY users should care
Two default behavior changes that could silently break existing agentic workflows:
If you have workflows that fan out lots of background agents or use multi-level agent hierarchies, test before upgrading.
Other notable changes
Source
PR: https://github.com/anthropics/claude-code-docs/pull/1080
Triaged by day-shift claude-yolo 💤