Claude Code v2.1.219 Released: Defaults to Opus 5 and Introduces Nested Subagents
Score
79新模型和嵌套深度提升对于AI编程工具领域具有信息增量，但并非颠覆性变化。
发布说明结构清晰、内容翔实，覆盖新功能、修复和移除项，专业度高。
对于Claude Code用户有直接实用价值，可立即升级体验新特性和Bug修复。
内容为最新版本发布，具有高度时效性。
信息来源为Anthropic官方GitHub Releases，权威可靠。
Base 83 × T1.5 Source weight ×0.95 = 79
Curation line 65Selected
Why selected
The release notes are professional and detailed, covering new features, fixes, and removals, directly reflecting product iteration; however, users need to experience performance changes themselves.
AI commentary
「As an AI coding tool enthusiast, I believe the biggest highlights of this update are the default enablement of Opus 5 and the increased subagent nesting depth. For engineers using Claude Code on complex projects, these improvements will directly enhance multi-step task handling. The new allowlist setting also provides better control for enterprise users. Overall, this is a stable version worth deploying immediately.」
Quick overview
Claude Code v2.1.219 updates the default Opus model to Claude Opus 5 with 1M context and fast mode pricing at $10/$50 per million tokens. It adds a strict network allowlist for sandboxed commands, increases default subagent nesting depth to 3, introduces workflow size guidelines, and fixes numerous bugs including improved MCP error reporting. This release enhances developer productivity and security.
- Default model upgraded to Claude Opus 5 with 1M context and fast mode.
- New sandbox.network.strictAllowlist setting restricts network access for sandboxed commands.
- Subagent nesting depth increased from 1 to 3 by default, enabling complex multi-agent collaboration.
- Dynamic workflows now default to a medium size guideline aiming for fewer than 15 agents.
Full text
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What's changed
- Added Claude Opus 5 (
claude-opus-5), now the default Opus model — 1M context, fast mode at $10/$50 per Mtok - Added
sandbox.network.strictAllowlistsetting to deny non-allowlisted hosts for sandboxed commands without prompting - Added
DirectoryAddedhook that fires after/add-diror the SDKregister_repo_rootcontrol request registers a new working directory mid-session - Added
mcp_server_errorsto the headless stream-json init event, listing--mcp-configentries skipped by config validation; terminal runs print a startup warning - Added the
workflowSizeGuidelinesettings key so the advisory Dynamic workflow size guideline can be set from any settings file; the/configrow is hidden while one does - Added nested subagent forwarding in stream-json: subagents spawned at depth-2+ now appear when
--forward-subagent-textis set, keyed by their spawning Agenttool_useid - Fixed
claude -ptext output dropping the answer already produced when a turn dies on a mid-stream API error - Added HTTP status and error text to
claude mcp listand/mcpwhen a server fails to connect, and a warning for MCP config values with hidden leading or trailing whitespace - Fixed a permission you approved while a self-hosted runner was restarting being dropped when the session resumed, so the approved action now runs
- Fixed the Fable model row showing "Requires usage credits" for plans that include it, when a stale cache had baked the label in
- Fixed a SIGTERM arriving while a self-hosted runner was starting up leaving a stale active row until the lease expired; it now deregisters cleanly
- Added structured failure categories to self-hosted runner spawn and session failures, so hook errors, runner crashes and config errors can be told apart
- Fixed the
/modelpicker showing the merged Opus row as plain "Opus" instead of "Opus (1M context)" - Fixed copy-on-select inside GNU screen printing base64 into the terminal instead of copying the selection
- Fixed Remote Control clients keeping a stale fast-mode status after a model switch, reconnect, or failed org check
- Fixed
CLAUDE_CODE_GIT_BASH_PATHon Windows exiting or being used as bash when the path isn't a bash/sh binary; it's now ignored with a warning - Fixed Vim mode: pressing ← on an empty prompt now returns to the agent view from NORMAL mode, not just INSERT
- Fixed screen-reader mode rewriting the entire input line on every keystroke instead of echoing only the typed character
- Improved the "Remote Control is only available via api.anthropic.com" error to name the specific setting that caused it
- Improved
claude --teleportto show which repo your current checkout points at when it doesn't match the session's repo - Changed dynamic workflows to default to a medium size guideline (aim for fewer than 15 agents); pick another size or unrestricted with Dynamic workflow size in
/config - Changed managed MCP allowlist/denylist
${VAR}entries to resolve from the startup environment and managed-settings env instead of settings-file env - Changed the
/modelpicker to highlight only the newest model's name, so the highlight marks the new release rather than an arbitrary subset of the list - Added the current default workflow size to the running-workflow status line, with a pointer to
/configfor changing it - Removed Opus 4.7 from fast mode;
/fastnow applies to Opus 5 and Opus 4.8 - Updated the claude-api skill to default to Claude Opus 5, with a migration path from Opus 4.8
- Subagents can now spawn nested subagents up to depth 3 by default (was 1); set CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH=1 to disable nesting
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