The memory leak hunting was aggressive . They squashed six or seven distinct leaks — agent task state, LSP diagnostics, completed task output, circular buffers, shell process refs — basically anything that could accumulate in long sessions was audited and fixed. Combined with new cache clearing after compaction and capped file history snapshots, this should make for more reliable long sessions. Worktree isolation is becoming a first-class concept. Agents can declaratively run in isolated git worktrees, with new hook events for custom setup/teardown. CLAUDE_CODE_SIMPLE mode is now actually simple — it strips MCP tools, hooks, CLAUDE.md, skills, session memory, the works. Session reliability got love too. In previous releases, symlinked working directories could make resumed sessions invisible, and SSH disconnects could lose data. Both of these issues were fixed. Smaller wins: LSP startupTimeout config, claude agents CLI command, faster headless startup, Linux glibc compat for RHEL 8, Opus 4.6 fast mode gets full 1M context. Full changelog: Added support for startupTimeout configuration for LSP servers Added WorktreeCreate and WorktreeRemove hook events, enabling custom VCS setup and teardown when agent worktree isolation creates or removes worktrees. Fixed a bug where resumed sessions could be invisible when the working directory involved symlinks, because the session storage path was resolved at different times during startup. Also fixed session data loss on SSH disconnect by flushing session data before hooks and analytics in the graceful shutdown sequence. Linux: Fixed native modules not loading on systems with glibc older than 2.30 (e.g., RHEL 8) Fixed memory leak in agent teams where completed teammate tasks were never garbage collected from session state Fixed CLAUDE_CODE_SIMPLE to fully strip down skills, session memory, custom agents, and CLAUDE.md token counting Fixed /mcp reconnect freezing the CLI when given a server name that doesn’t exist Fixed memory leak where completed task state objects were never removed from AppState Added support for isolation: worktree in agent definitions, allowing agents to declaratively run in isolated git worktrees. CLAUDE_CODE_SIMPLE mode now also disables MCP tools, attachments, hooks, and CLAUDE.md file loading for a fully minimal experience. Fixed bug where MCP tools were not discovered when tool search is enabled and a prompt is passed in as a launch argument Improved memory usage during long sessions by clearing internal caches after compaction Added claude agents CLI command to list all configured agents Improved memory usage during long sessions by clearing large tool results after they have been processed Fixed a memory leak where LSP diagnostic data was never cleaned up after delivery, causing unbounded memory growth in long sessions Fixed a memory leak where completed task output was not freed from memory, reducing memory usage in long sessions with many tasks Improved startup performance for headless mode ( -p flag) by deferring Yoga WASM and UI component imports Fixed prompt suggestion cache regression that reduced cache hit rates Fixed unbounded memory growth in long sessions by capping file history snapshots Added CLAUDE_CODE_DISABLE_1M_CONTEXT environment variable to disable 1M context window support Opus 4.6 (fast mode) now includes the full 1M context window VSCode: Added /extra-usage command support in VS Code sessions Fixed memory leak where TaskOutput retained recent lines after cleanup Fixed memory leak in CircularBuffer where cleared items were retained in the backing array Fixed memory leak in shell command execution where ChildProcess and AbortController references were retained after cleanup submitted by /u/CharlesWiltgen
Originally posted by u/CharlesWiltgen on r/ClaudeCode
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