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Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.251 Feeds RSS JSON llms.txt
Reading a new release v2.1.251 Analysing changes · 2/5 Deeper second pass · 0/5 agents 427 findings $12.75 so far

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.

One change

Manage costs effectively

costs

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Nearest release: v2.1.238, published an hour before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

costs Changed · +1 / -0 lines

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 * **Cache misses**: your first message after a break longer than the [cache lifetime](/docs/en/prompt-caching#cache-lifetime) misses the cache and reprocesses your full context. The lifetime is an hour on a subscription and drops to five minutes once you're drawing on [usage credits](https://support.claude.com/en/articles/12429409-extra-usage-for-paid-claude-plans); on an API key or cloud provider, it's five minutes by default. You can keep the one-hour lifetime while drawing on usage credits by setting [`ENABLE_PROMPT_CACHING_1H=1`](/docs/en/env-vars). On Pro and Max plans, when you resume a large session after a long break, Claude Code [offers to resume from a summary](/docs/en/sessions#resume-from-a-summary) so later requests don't carry the full history
 * **Scheduled tasks**: a [scheduled task](/docs/en/scheduled-tasks) fires on its interval even while the session is idle, sending your full context each time
 * **Cross-session messages**: Claude Code delivers a [message from another of your sessions](/docs/en/cross-session-messaging) as a new turn when this session sits idle, sending your full context each time. To hold inbound messages instead of delivering them, set [`crossSessionInbound`](/docs/en/settings#available-settings) to `hold`
+* **Goal check-ins**: while background work keeps an active [goal](/docs/en/goal) waiting, Claude Code [asks Claude to check on that work](/docs/en/goal#background-work-defers-evaluation) even when the session sits idle, starting a new turn that sends your full context. To turn check-ins off, set [`CLAUDE_CODE_GOAL_CHECKIN_MINUTES`](/docs/en/env-vars) to `0`. Idle check-ins require Claude Code v2.1.236 or later
 * **Agent teammates**: each active [teammate](#agent-team-token-costs) keeps consuming tokens until it exits
 * **Compaction**: `/compact` reads the conversation it summarizes, so [compacting a large context](/docs/en/prompt-caching#compacting-the-conversation) is itself a large request. When you want a fresh start instead of continuity, `/clear` costs nothing