2.1.41 untested · changelog-derived

Claude Code 2.1.41

**`claude auth` CLI subcommands (login/status/logout)** — enables programmatic and interactive authentication workflows without manual config file editing. This matters for automation, CI/CD, and credential rotation loops where auth state must be explicitly managed.

6 new primitives 2 workflow recipes 18 fixes

New primitives

claude auth logincommand

Initiates interactive authentication flow

Added `claude auth login`, `claude auth status`, and `claude auth logout` CLI subcommands
claude auth statuscommand

Reports current authentication state

Added `claude auth login`, `claude auth status`, and `claude auth logout` CLI subcommands
claude auth logoutcommand

Clears authentication credentials

Added `claude auth login`, `claude auth status`, and `claude auth logout` CLI subcommands
speed attribute (OTel)setting/tracing

Marks fast mode visibility in traces and spans

Added `speed` attribute to OTel events and trace spans for fast mode visibility
Windows ARM64 supportcapability

Native binary for win32-arm64 architecture

Added Windows ARM64 (win32-arm64) native binary support
/rename auto-generationcommand enhancement

Session renaming from conversation context without args

Improved `/rename` to auto-generate session name from conversation context when called without arguments

Workflow recipes

Headless CI/CD Credential Rotation Loop
claude auth login + claude auth status + claude auth logout

The auth CLI subcommands enable agents to manage credential lifecycle without interactive prompts, unlocking automated credential rotation, multi-account cycling, and safe session cleanup in orchestrated pipelines.

Build a CI/CD agent that (1) rotates authentication on a cron schedule by calling claude auth logout to clear stale creds, (2) uses claude auth login with piped input or environment-driven flows to re-authenticate with fresh tokens, (3) polls claude auth status to verify successful auth before launching dependent workflows, and (4) audits auth state changes in OTel/trace logs for compliance reporting.

Observable Agent Performance Monitoring with OTel Speed Attribute
speed attribute (OTel) + existing trace/span instrumentation

The speed attribute exposes fast-mode execution in OTel spans, enabling agents to self-monitor performance and make runtime decisions about trading speed for quality (e.g., falling back to thorough mode if fast-mode latency regresses).

An agent that logs its own execution traces with the speed attribute, then querying those traces via OTel backend (Datadog, New Relic, Honeycomb) to detect when fast-mode runs exceed latency budgets. Agents can consume this signal to auto-switch modes, trigger escalations, or annotate outputs with confidence/speed tradeoff metadata.

Agentic relevance

The `claude auth` subcommands unlock headless credential management for agent workflows running in CI/CD or orchestration contexts where interactive login cannot be assumed. The `speed` OTel attribute enables observability of fast-mode traces, critical for agents monitoring their own execution performance. Windows ARM64 support broadens deployment surface for Claude Code agents on modern ARM-based Windows systems.

Hardening & fixes (18)

  • Fixed Agent Teams using wrong model identifier for Bedrock, Vertex, and Foundry customers
  • Fixed a crash when MCP tools return image content during streaming
  • Fixed /resume session previews showing raw XML tags instead of readable command names
  • Improved model error messages for Bedrock/Vertex/Foundry users with fallback suggestions
  • Fixed plugin browse showing misleading "Space to Toggle" hint for already-installed plugins
  • Fixed hook blocking errors (exit code 2) not showing stderr to the user
  • Added guard against launching Claude Code inside another Claude Code session
  • Fixed file resolution failing for @-mentions with anchor fragments (e.g., `@README.md#installation`)
  • Fixed FileReadTool blocking the process on FIFOs, `/dev/stdin`, and large files
  • Fixed background task notifications not being delivered in streaming Agent SDK mode
  • Fixed cursor jumping to end on each keystroke in classifier rule input
  • Fixed markdown link display text being dropped for raw URL
  • Fixed auto-compact failure error notifications being shown to users
  • Fixed permission wait time being included in subagent elapsed time display
  • Fixed proactive ticks firing while in plan mode
  • Fixed clear stale permission rules when settings change on disk
  • Fixed hook blocking errors showing stderr content in UI
  • Improved narrow terminal layout for prompt footer

Raw changelog

## 2.1.41

- Added guard against launching Claude Code inside another Claude Code session
- Fixed Agent Teams using wrong model identifier for Bedrock, Vertex, and Foundry customers
- Fixed a crash when MCP tools return image content during streaming
- Fixed /resume session previews showing raw XML tags instead of readable command names
- Improved model error messages for Bedrock/Vertex/Foundry users with fallback suggestions
- Fixed plugin browse showing misleading "Space to Toggle" hint for already-installed plugins
- Fixed hook blocking errors (exit code 2) not showing stderr to the user
- Added `speed` attribute to OTel events and trace spans for fast mode visibility
- Added `claude auth login`, `claude auth status`, and `claude auth logout` CLI subcommands
- Added Windows ARM64 (win32-arm64) native binary support
- Improved `/rename` to auto-generate session name from conversation context when called without arguments
- Improved narrow terminal layout for prompt footer
- Fixed file resolution failing for @-mentions with anchor fragments (e.g., `@README.md#installation`)
- Fixed FileReadTool blocking the process on FIFOs, `/dev/stdin`, and large files
- Fixed background task notifications not being delivered in streaming Agent SDK mode
- Fixed cursor jumping to end on each keystroke in classifier rule input
- Fixed markdown link display text being dropped for raw URL
- Fixed auto-compact failure error notifications being shown to users
- Fixed permission wait time being included in subagent elapsed time display
- Fixed proactive ticks firing while in plan mode
- Fixed clear stale permission rules when settings change on disk
- Fixed hook blocking errors showing stderr content in UI
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