Verification Report
Source baseline and checks for the English Claude Code Command Master.
Source Baseline
Checked on 2026-08-03 against:
- Official Commands reference: https://code.claude.com/docs/en/commands
- Official CLI reference: https://code.claude.com/docs/en/cli-reference
- Official Changelog: https://code.claude.com/docs/en/changelog
- Official Model configuration: https://code.claude.com/docs/en/model-config
- Official Agent View guide: https://code.claude.com/docs/en/agent-view
- Official Skills guide: https://code.claude.com/docs/en/skills
- Official Fast mode guide: https://code.claude.com/docs/en/fast-mode
- Official Routines guide: https://code.claude.com/docs/en/routines
- Claude Fable 5 and Claude Mythos 5: https://platform.claude.com/docs/en/about-claude/models/introducing-claude-fable-5-and-claude-mythos-5
- Fable refusals and fallback: https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback
- Fable fallback credit: https://platform.claude.com/docs/en/build-with-claude/fallback-credit
- Prompting Claude Fable 5: https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/prompting-claude-fable-5
- Usage credits: https://support.claude.com/en/articles/12429409-manage-usage-credits-for-paid-claude-plans
- Claude Sonnet 5 announcement: https://www.anthropic.com/news/claude-sonnet-5
- Claude models overview: https://platform.claude.com/docs/en/about-claude/models/overview
- Claude Opus 4.8 announcement: https://www.anthropic.com/news/claude-opus-4-8
- npm package: https://www.npmjs.com/package/@anthropic-ai/claude-code
Locale Checks
/en/books/claude-code-command-masterrenders English content only.- The English root meta registers
claude-code-command-master. - Home preview chapters are loaded with
locale=en. - Unsupported English books remain translation requests instead of falling back to Korean content.
- The locale switcher should allow English for this book once the page exists in both locales.
Editorial Checks
| Area | Status |
|---|---|
| Cover metadata | Complete |
| Command catalog | Complete |
| Core command grouping | Complete |
| Skills/custom commands | Complete |
| Web automation commands | Complete |
| Operations and safety commands | Complete |
| Update log | Complete |
Current Baseline Checks
| Area | Baseline |
|---|---|
| August 3 re-check | No stable release or command addition, removal, or rename after v2.1.220 |
| Claude Code version | v2.1.220 latest and next; v2.1.212 stable |
| v2.1.206–220 changes | Opus 5; /fork//subtask split; manual-only review/verify; forked-skill background default; agent limits; sandbox, hooks, and headless MCP-error updates |
| v2.1.202–205 changes | Workflow sizing/OTel, fast /review split, Agent View/background/MCP roots, headless hook streaming, full /doctor checkup, Auto-mode and JSON Schema fixes |
| v2.1.198–201 changes | Subagents background-by-default (v2.1.198), /dataviz skill, Claude in Chrome GA, default permission mode "Manual" (v2.1.200), Sonnet 5 mid-conversation system role removed (v2.1.201) |
| Fable path | Fable 5 on Claude Code v2.1.170+ (released June 9, 2026); selected with /model fable, not default |
| Fable 5 redeployment | Suspended 2026-06-12 under US export controls; restored globally 2026-07-01 with an improved safety classifier. Mythos 5 (no classifiers) is Project Glasswing invitation-only and not selectable via /model |
| Fable plan access | Temporary subscription allowance ended 2026-07-07; current Pro/Max/Team and seat-based Enterprise access requires usage credits, while API consumption is billed separately |
| Fable API refusal | HTTP 200 with stop_reason: "refusal"; monitor it separately from transport and HTTP errors |
| Fable API fallback | Server-side fallbacks, SDK middleware, and manual retry documented separately from Claude Code availability fallback |
| Fallback billing | Pre-output refusals are not billed; fallback credit avoids duplicate prompt-cache write cost on a model switch |
| Fable prompting | Avoid internal-reasoning extraction instructions; use concise rationale and structured adaptive-thinking blocks |
| Sonnet path | Sonnet 5 on Claude Code v2.1.197+; default for Pro, Team Standard, and Enterprise subscription seats |
| Latest Opus path | Opus 5 with native 1M context on Claude Code v2.1.219+ |
| Anthropic API aliases | fable → Fable 5, best → Fable when available otherwise latest Opus, opus → Opus 5, sonnet → Sonnet 5 |
| Recent command deltas | /advisor accepts fable; /cd relocates the session and storage; --safe-mode isolates customization while keeping auth/model/permissions |
| Model fallback | Fable classifier fallback to Opus; fallbackModel chains for availability failures |
| Skill controls | --disable-slash-commands; disableBundledSkills; CLAUDE_CODE_DISABLE_BUNDLED_SKILLS |
| CI reliability | Self-hosted runner post-session hook; v2.1.170 transcript persistence fix for VS Code integrated terminals and inherited Claude Code env vars |
| Background work | Agent View, /background//bg, claude --bg, claude --bg --exec |
| Dynamic work | /goal and /workflows |
| Usage continuation | /usage-credits; /extra-usage treated as legacy |
| Review split | /code-review for correctness, /simplify for cleanup |
| MCP operations | claude mcp login/logout; CLAUDE_CODE_MCP_TOOL_IDLE_TIMEOUT |
| Sandbox operations | sandbox.credentials, sandbox.network.strictAllowlist, sandbox.filesystem.disabled, destructive-command and Windows fixes |
| Agent limits | Three-level nesting, 20 concurrent by default, 200 per session, Agent deny rules |
| Model warnings | Main model restriction notes and stronger deprecated-model warnings |
Known Limits
This English edition is not a one-file-per-command translation of the Korean source. It is a localized operating handbook that groups commands by usage so the English locale stays concise and maintainable.