upstream: official claude code updates 2026-04-16

[github-actions]

upstream changes detected

sources: anthropic/changelog, anthropic/official-docs, anthropics/claude-code, marckrenn/claude-code-changelog, shanraisshan/claude-code-best-practice
changes found: 23
files edited: 5
staleness flags: 4

what changed upstream

• [release] v2.1.111 (link)
• [commit] add fourth-most-starred SVG badge for README (link)
• [commit] append development workflows changelog — star and count updates for 7 repos (link)
• [commit] add TIPS URL consistency rule to concepts verification checklist (link)
• [commit] append v2.1.110 changelog entry for concepts — fix stale /schedule URL in TIPS (link)
• [commit] append v2.1.110 changelog entry for subagents report — no drift detected (link)
• [commit] append v2.1.110 changelog entry for skills report — no drift detected (link)
• [commit] append v2.1.110 changelog entry for commands report — /undo alias added (link)
• [commit] update subagents report badge to v2.1.110 (link)
• [commit] update skills report badge to v2.1.110 (link)
• [commit] update commands report to v2.1.110 — add /undo alias to /rewind (link)
• [commit] v2.1.111 (link)
• [commit] v2.1.111 (link)
• [commit] v2.1.111 - remove (link)
• [commit] v2.1.111 - init (8 tokens) (link)
• [commit] v2.1.111 - init (81 tokens) (link)
• [commit] v2.1.111 - init (14 tokens) (link)
• [commit] v2.1.111 - init (21 tokens) (link)
• [commit] v2.1.111 - init (15 tokens) (link)
• [commit] v2.1.111 - init (13 tokens) (link)
• [commit] v2.1.111 - init (16 tokens) (link)
• [changelog] Claude Code changelog updated (link)
• [docs_change] Official Claude Code docs updated (link)

staleness flags

file	claim	reality	severity
docs/tips/fast-mode.md	fast mode keeps you on opus. it does not switch to a cheaper or smaller model.	claude code v2.1.111 now supports opus 4.7 with /effort levels including 'xhigh' for tuned speed vs intelligence tradeoffs. fast mode behavior may have changed with new model capabilities.	medium
docs/tips/ultrathink.md	force claude code into extended thinking mode for complex problems	v2.1.111 introduces /effort slider (xhigh, high, etc) and auto mode for opus 4.7 that may provide similar or better control over reasoning depth than ultrathink alone.	medium
docs/agents.md	subagents are powerful but expensive -- each one is a full billing stream.	v2.1.111 adds /ultrareview for parallel multi-agent code review in the cloud. architecture patterns for agent billing may have shifted with cloud-hosted agent options.	medium
docs/tips/session-length.md	shorter sessions are more efficient	v2.1.111 plan files now named after prompts (e.g. fix-auth-race-snug-otter.md) instead of random words. this may improve session continuity and change optimal session length patterns.	low

proposed edits

• docs/tips/fast-mode.md: fast mode semantics changed with /effort slider in v2.1.111
• docs/tips/ultrathink.md: /effort provides more precise control than ultrathink for opus 4.7
• docs/automation.md: /ultrareview is a new first-class feature that fits the automation patterns in this doc
• docs/tips/session-workflow.md: plan file naming convention changed, improves session continuity discovery
• docs/tips/README.md: /effort is a new first-class tip for controlling model behavior on v2.1.111+
• docs/comparisons/pricing.md: v2.1.111 introduces new effort/review features that affect token consumption patterns

review checklist

• staleness flags accurate?
• version numbers and pricing correct?
• proposed edits read naturally?

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