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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.59

17 entries read diff v2.1.58 → v2.1.59 Markdown

This is a major release that introduces voice dictation mode, allowing users to hold Space to speak instead of typing. It also adds a new fastModePerSessionOptIn setting so fast mode resets each session, overhauls the copy-to-clipboard experience to let users pick specific code blocks, adds support for CLAUDE_CODE_OAUTH_REFRESH_TOKEN for headless login, and bundles a ZIP-based plugin caching system for headless/CI environments. Opus 4.6 model routing via the coral_reef_opus flag is also introduced.

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Changesopen

Voice Dictation Mode#

What

Hold the Space bar to dictate text via speech-to-text, with real-time transcription streamed over WebSocket to Claude.ai's /api/ws/speech_to_text/voice_stream endpoint.

Usage
/voice          # Toggle voice mode on/off

Then hold Space to record; release to stop. The transcript is injected into the input field.

Details
  • Requires a Claude.ai account (OAuth); run /login first if not signed in
  • Persisted via the voiceEnabled setting in settings.json
  • Audio capture uses a bundled native module (audio-capture.node) on macOS/Linux, with fallback to sox (rec command) or arecord on Linux
  • Offers guided SoX installation (detects brew, apt-get, dnf, pacman) if no audio tool is found
  • Supports a "focus mode" that continuously records when the terminal has focus, flushing each finalized segment immediately
  • Cursor displays an animated audio-level indicator (bar graph characters ▁▂▃▄▅▆▇█) with color cycling while recording
  • Shows "listening…" while recording and an animated "Voice: processing…" while finalizing
  • Supports 11 languages: English, Spanish, French, Japanese, German, Portuguese, Italian, Korean, Chinese, Hindi, Indonesian — configured via the language setting
  • Microphone permission checks with platform-specific guidance (macOS: System Settings → Privacy & Security → Microphone; Linux: system audio settings; Windows: Settings → Privacy → Microphone)
  • Not available in remote/headless environments — prints helpful message directing users to run locally
Evidence

/voice command (search for "Toggle voice mode"), WebSocket client (search for "/api/ws/speech_to_text/voice_stream"), settings definition (search for "voiceEnabled")

[Gradual Rollout] — Gated behind the tengu_amber_quartz feature flag (defaults to !1/false). The /voice command is hidden when the flag is off. Users with the flag enabled who are logged in to Claude.ai can use this feature.

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Headless Login via Refresh Token#

What

Log in to Claude Code non-interactively by providing an OAuth refresh token via environment variables, enabling automated CI/CD and headless deployments without a browser.

Usage
export CLAUDE_CODE_OAUTH_REFRESH_TOKEN="your-refresh-token"
export CLAUDE_CODE_OAUTH_SCOPES="user:inference"
claude /login
Details
  • CLAUDE_CODE_OAUTH_SCOPES is required when using the refresh token — the CLI exits with a helpful error message if missing
  • Scopes should be space-separated (e.g., "user:profile user:inference user:sessions:claude_code user:mcp_servers")
  • Bypasses the browser-based OAuth flow entirely
Evidence

Refresh token login flow (search for "CLAUDE_CODE_OAUTH_REFRESH_TOKEN")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Fast Mode Per-Session Opt-In Setting#

What

A new fastModePerSessionOptIn setting makes fast mode non-persistent, so each new session starts with fast mode off.

Details
  • When true, fast mode does not carry over between sessions — users must re-enable it each session
  • Useful for users who want fast mode available but not always on by default
Evidence

Setting description (search for "When true, fast mode does not persist across sessions")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

Enhanced Copy to Clipboard#

Feature flag
tengu_snippet_save Off in both readings

The flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.

This account: off · anonymous baseline: off · compiled default in v2.1.59: no gate table built for this version

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.59. It isn't a statement about your account. What a flag value here can and cannot tell you

What

The copy command now lets you choose between copying the full response or individual code blocks, with language-aware file extensions for saved snippets.

Details
  • When Claude's response contains code blocks, pressing the copy shortcut presents a picker: "Full response" or each individual code block (with language label and line count)
  • Falls back to saving to a file (e.g., response.md, copy.py) if clipboard access is unavailable, and shows the file path
  • Replaces the old behavior that only copied the full response as markdown
  • The old shell-snippet-only copy feature (tengu_snippet_save) has been removed
Evidence

New UI text (search for "Select content to copy:"), file save (search for "response.md")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Plugin ZIP Cache System#

What

A new ZIP-based caching system for MCP plugins, enabling efficient plugin distribution in headless and CI environments.

Details
  • Controlled by the CLAUDE_CODE_PLUGIN_CACHE_DIR environment variable
  • Creates versioned ZIP archives of plugin directories (with .zip extension)
  • Session-scoped plugin cache directories (claude-plugin-session-*) are automatically created and cleaned up
  • Marketplace JSON metadata is persisted alongside plugin ZIPs for offline resolution
  • Handles symlink cycles during ZIP creation with cycle detection
  • Includes CLAUDE_CODE_DISABLE_OFFICIAL_MARKETPLACE_AUTOINSTALL env var to disable automatic marketplace plugin installation
Evidence

ZIP cache mode (search for "zip cache mode"), session cache (search for "claude-plugin-session-")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

VCS Type Detection#

The platform detection module now identifies the version control system in use. It checks for .git (git), .hg (Mercurial), .svn (SVN), .p4config/P4PORT (Perforce), and $tf/.tfvc (TFS). This information is included in environment telemetry.

Evidence

VCS detection map (search for "mercurial", "perforce")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Linux Distro Metadata Collection#

On Linux systems, Claude Code now reads /etc/os-release to capture linuxDistroId, linuxDistroVersion, and linuxKernel for improved platform-specific diagnostics.

Evidence

Distro detection (search for "linuxDistroId")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Background Task Count in Turn Duration#

The turn duration indicator now shows how many background tasks are still running after each turn (e.g., · 2 background tasks still running ↓), making it easier to track background task activity.

Evidence

Status line rendering (search for "background task" and "still running")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Auto-Memory Label No Longer "Research Preview"#

The auto-memory feature label has been updated from "Auto-memory (research preview)" to simply "Auto-memory", indicating the feature has graduated from its experimental phase.

Evidence

String change — removed "Auto-memory (research preview):", added "Auto-memory:"

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

MCP Config File Atomic Writes#

Writing .mcp.json now uses atomic file writes (write to temp file, then rename) to prevent corruption if the process is interrupted mid-write.

Evidence

Atomic write helper (search for ".mcp.json" in added function Vw7)

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

MCP OAuth Refresh Lock#

A new file-based locking mechanism prevents concurrent MCP server OAuth token refreshes from colliding. Lock files (mcp-refresh-*.lock) coordinate between processes with retry logic and timeout handling.

Evidence

Lock file naming (search for "mcp-refresh-")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

Hook Output Error Message Improvement#

When a hook produces invalid JSON output, the error message now says "The hook's output was:" (previously "The hook's stdout was:"), more accurately reflecting that output may come from various sources.

Evidence

Error message (search for "The hook's output was:")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Working Directory Existence Check#

Claude Code now detects when its working directory has been deleted and shows a clear error: Working directory "..." no longer exists. Please restart Claude from an existing directory.

Evidence

Error message (search for "no longer exists. Please restart")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Worktree Cleanup Error Handling#

If git worktree cleanup fails during session exit, the error is now caught and logged ("Worktree cleanup failed, exiting anyway") instead of potentially blocking shutdown.

Evidence

Error message (search for "Worktree cleanup failed")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Repo Text Size Metric#

A new telemetry metric (tengu_repo_text_file_size) calculates the total byte size of text source files in the repo using git ls-tree. It counts files with common code extensions (.ts, .py, .js, .go, .rs, etc.) to help understand repository scale.

Evidence

Metric calculation (search for "repoTextSize")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Session Memory Loading Improvement#

Session memory loading now uses async file reading and handles ENOENT/EACCES/EPERM errors gracefully by returning null, instead of synchronously checking file existence first.

Evidence

Error handling (search for "tengu_session_memory_loaded")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

2 entries

Bug Fixesopen

#

  • Fixed safe-flag parsing for combined short flags in commands like grep and rg (e.g., -A5 is now correctly recognized as -A with value 5 when -A accepts a number) (search for "grep" and "rg" in function Hn7)
  • Improved Remote Control error messaging: users on unsupported plans now see "Error: Remote Control is not yet available on your plan." (search for "Remote Control is not yet available")
  • Fixed line-reference edit operations to properly validate hash mismatches with clear error messages showing expected vs actual hash, preventing silent corruption when files change between reads (search for "LINE#HASH")

Opus 4.6 Model Routing [Gradual Rollout]#

What

Infrastructure for routing requests to the Opus 4.6 model when a coral_reef_opus feature flag is enabled server-side.

Status

Feature-flagged via coral_reef_opus

Details
  • When coral_reef_opus is "true" and the model string contains "opus-4-6", a special token limit of 1,000,000 is applied
  • Extended output is enabled for matching Opus 4.6 models via the HbA() function
  • Gated behind multiple checks: not in test mode, not using custom provider
Evidence

Model routing (search for "coral_reef_opus", "opus-4-6")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Verbatim
Official · Anthropic

Anthropic’s official release notes

Published verbatim by Anthropic for v2.1.59. Text is unmodified from the upstream changelog. Everything else on this page came out of the bundle instead, which is why the two lists don't match.

  • Claude automatically saves useful context to auto-memory. Manage with /memory
  • Added /copy command to show an interactive picker when code blocks are present, allowing selection of individual code blocks or the full response.
  • Improved "always allow" prefix suggestions for compound bash commands (e.g. cd /tmp && git fetch && git push) to compute smarter per-subcommand prefixes instead of treating the whole command as one
  • Improved ordering of short task lists
  • Improved memory usage in multi-agent sessions by releasing completed subagent task state
  • Fixed MCP OAuth token refresh race condition when running multiple Claude Code instances simultaneously
  • Fixed shell commands not showing a clear error message when the working directory has been deleted
  • Fixed config file corruption that could wipe authentication when multiple Claude Code instances ran simultaneously
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