upstream: official claude code updates 2026-04-15

[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: 18
files edited: 6
staleness flags: 3

what changed upstream

• [release] v2.1.109 (link)
• [release] v2.1.108 (link)
• [commit] updated (link)
• [commit] commit (link)
• [commit] add Pakistan's 4th most ★ repo badge line, update timestamp to Apr 15 (link)
• [commit] sort Hot table by release recency — newest features (Routines, Devcontainers, Channels) first (link)
• [commit] v2.1.109 (link)
• [commit] v2.1.109 (link)
• [commit] v2.1.109 - remove (link)
• [commit] v2.1.109 - init (334 tokens) (link)
• [commit] v2.1.109 - init (324 tokens) (link)
• [commit] v2.1.109 - init (323 tokens) (link)
• [commit] v2.1.109 - init (329 tokens) (link)
• [commit] v2.1.109 - init (351 tokens) (link)
• [commit] v2.1.109 - init (653 tokens) (link)
• [commit] v2.1.109 - init (537 tokens) (link)
• [changelog] Claude Code changelog updated (link)
• [docs_change] Official Claude Code docs updated (link)

staleness flags

file	claim	reality	severity
docs/tips/prompt-caching.md	every edit breaks the prefix cache for that session	v2.1.108 added ENABLE_PROMPT_CACHING_1H env var for 1-hour cache TTL (vs previous 5-min default), meaning cache persistence changed	medium
docs/cost.md	tested with: claude code v2.1.94	v2.1.109 is current; v2.1.108 added caching TTL options that affect session cost math	low
docs/tips/context-management.md	tested with: claude code v2.1.94	v2.1.109 is current; no functional changes to compaction behavior but version stamp is stale	low

proposed edits

• docs/tips/prompt-caching.md: v2.1.108 added env vars that directly impact cache strategy and cost
• docs/cost.md: cache TTL change affects cost math on longer sessions; worth noting in pricing context
• docs/tips/README.md: v2.1.108 shipped recap feature (auto summaries on /resume); worth adding to tip list
• docs/tips/session-workflow.md: v2.1.108 shipped recap; directly affects session workflow when resuming
• docs/tips/fast-mode.md: version stamp update for freshness
• docs/hooks.md: version stamp update for freshness
• docs/tips/plan-mode.md: version stamp update for freshness

review checklist

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

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