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Sweep 06 Nov 2026 · 01:32Z Build v2.1.319 537 read Stable v2.1.311 Latest v2.1.318 Next v2.1.319 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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What has changed since

An entry is only as true as the day it was written.

Flags move on the server after a release ships. Anthropic's own notes land days later and their documentation later still. Sometimes an entry turns out to be wrong and gets corrected by hand. All of that is recorded against the entry it happened to, and this is the whole of it in the order it happened.

Nothing here replaces an entry. Every line links to the page its release published, still saying what that release said, because a correction is added and dated rather than swapped in.

Events22,549dated, and never edited afterwards
Newestthe last time anything moved
Flag readings moved17,196a reading is one sample, for one account
Documentation arrived5,243a docs edit touched an entry's names
WhenEntryWhat happened
v2.1.239tengu_toasty_breeze Flag reading movedThe flag server now returns {"allowanceNote":"{percent} allowance left","budgetExhaustedCopy":"You've used this week's lower-priority allowance","cooloffMinutes":10,"enabled":true,"label":"Continue now at lower priority","noticeLine":"/low-priority to continue now at lower priority · uses your weekly limit","statusLine":"Lower priority until {reset}","version":3,"waitBanner":"Working at lower priority · waiting for capacity"} for tengu_toasty_breeze, read as this account.
v2.1.239tengu_toasty_breeze Flag reading movedThe flag server now returns {"allowanceNote":"{percent} allowance left","budgetExhaustedCopy":"You've used this week's lower-priority allowance","cooloffMinutes":10,"enabled":true,"label":"Continue now at lower priority","noticeLine":"/low-priority to continue now at lower priority · uses your weekly limit","statusLine":"Lower priority until {reset}","version":3,"waitBanner":"Working at lower priority · waiting for capacity"} for tengu_toasty_breeze, read as this account.
v2.1.248tengu_nifty_lemur Flag reading movedThe flag server now returns {"autoContinue":true,"enabled":true,"label":"Reset your session limit now","noticeLine":"/limit-reset to reset your session limit now · uses weekly limit · 1/week","spentLine":"Weekly reset used · available again {date}","successLine":"Session limit reset · next reset available {date} · your weekly limit still applies","unavailableLine":"Couldn't reset your session limit right now · try again in a moment","version":1} for tengu_nifty_lemur, read as this account.
v2.1.248tengu_nifty_lemur Flag reading movedThe flag server now returns {"autoContinue":true,"enabled":true,"label":"Reset your session limit now","noticeLine":"/limit-reset to reset your session limit now · uses weekly limit · 1/week","spentLine":"Weekly reset used · available again {date}","successLine":"Session limit reset · next reset available {date} · your weekly limit still applies","unavailableLine":"Couldn't reset your session limit right now · try again in a moment","version":1} for tengu_nifty_lemur, read as this account.
v2.1.223tengu_juniper_relay Flag reading movedThe flag server now returns on for tengu_juniper_relay, read as this account.
v2.1.251tengu_juniper_relay Flag reading movedThe flag server now returns on for tengu_juniper_relay, read as this account.
v2.1.277/usage Documentation arrivedAnthropic's documentation has since written up /usage, on user-management.
the line in the docs

| Usage and cost reports | Available; see the [Usage and Cost API](https://platform.claude.com/docs/en/manage-claude/usage-cost-api) | Available through the [Claude Enterprise Analytics API](https://platform.claude.com/docs/en/manage-claud…
v2.1.275memory_delete Documentation arrivedA small documentation edit on Fetch the first page (newest activities first) and capture its trailing cursor. touched a line naming memory_delete after this was published.
the line in the docs

A `user_actor` activity does not always mean the user took the action. Processes that Anthropic runs on a user's behalf can currently appear as `user_actor` for the affected user rather than as `system_actor`, and this attribution may chan…
v2.1.277claude-opus-5 Documentation arrivedAnthropic's documentation has since written up claude-opus-5, on skills-guide.
the line in the docs

"model": "claude-opus-5",
v2.1.274contentType Documentation arrivedAnthropic's documentation has since written up contentType, on skills-guide.
the line in the docs

.contentType("text/markdown")
v2.1.246contentType Documentation arrivedAnthropic's documentation has since written up contentType, on skills-guide.
the line in the docs

.contentType("text/markdown")
v2.1.275SKILL.md Documentation arrivedAnthropic's documentation has since written up SKILL.md, on skills-guide.
the line in the docs

-F "files[]=@dcf_skill/SKILL.md;filename=dcf_skill/SKILL.md"
v2.1.274position Documentation arrivedAnthropic's documentation has since written up position, on preserved-thinking.
the line in the docs

* [Compaction at a token threshold](https://platform.claude.com/docs/en/build-with-claude/compaction-threshold) summarizes older turns into a compaction block when the context approaches a threshold you set, and the checked prefix restarts…
v2.1.277headers Documentation arrivedAnthropic's documentation has since written up headers, on overview.
the line in the docs

| **Beta** | Preview features used for gathering feedback and iterating on a less mature use case. Availability may be limited, including through sign-up requirements or waitlists, and may not be publicly announced. Features may change sig…
v2.1.277headers Documentation arrivedAnthropic's documentation has since written up headers, on overview.
the line in the docs

| **Beta** | Preview features used for gathering feedback and iterating on a less mature use case. Availability may be limited, including through sign-up requirements or waitlists, and may not be publicly announced. Features may change sig…
v2.1.277surface Documentation arrivedA small documentation edit on List local sessions touched a line naming surface after this was published.
the line in the docs

The product the session ran in: `cowork` (Cowork in Claude Desktop on the user's machine), `claude_code` (Claude Code), `claude_science` (Claude Science), `claude_in_chrome` (the Claude in Chrome browser extension's built-in chat), or one …
v2.1.277surface Documentation arrivedAnthropic's documentation has since written up surface, on Beta.
the line in the docs

Deprecated: use `group.type` instead. The kind of rate-limit group this entry represents. `model_group` entries apply to a family of models (listed in `models`); other values apply to an API-surface category and have `models` set to `null`…
v2.1.274sdk Documentation arrivedA small documentation edit on Log at info level touched a line naming sdk after this was published.
the line in the docs

For long-running agentic tasks, the TypeScript and Ruby tool runners support automatic [compaction](https://platform.claude.com/docs/en/build-with-claude/context-editing#client-side-compaction-sdk), which generates summaries when token usa…
v2.1.274sdk Documentation arrivedA small documentation edit on Log at info level touched a line naming sdk after this was published.
the line in the docs

For long-running agentic tasks, the TypeScript and Ruby tool runners support automatic [compaction](https://platform.claude.com/docs/en/build-with-claude/context-editing#client-side-compaction-sdk), which generates summaries when token usa…
v2.1.277headers Documentation arrivedA small documentation edit on computer-use-tool touched a line naming headers after this was published.
the line in the docs

Existing `computer_20251124` integrations keep working on the models listed for it under [Earlier tool versions](https://platform.claude.com/docs/en/agents-and-tools/tool-use/computer-use-tool#earlier-tool-versions), and earlier tool versi…
v2.1.277headers Documentation arrivedA small documentation edit on computer-use-tool touched a line naming headers after this was published.
the line in the docs

Existing `computer_20251124` integrations keep working on the models listed for it under [Earlier tool versions](https://platform.claude.com/docs/en/agents-and-tools/tool-use/computer-use-tool#earlier-tool-versions), and earlier tool versi…
v2.1.275/advisor Documentation arrivedA small documentation edit on optimizing-for-cost-and-intelligence touched a line naming /advisor after this was published.
the line in the docs

In agent loops the cache-read term is usually the largest of the five; if not, check that caching is engaged. When the [advisor tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/advisor-tool#usage-and-billing) or [compact…
v2.1.206tengu_umber_kestrel Flag reading movedThe flag server now returns off for tengu_umber_kestrel, read as this account.
v2.1.239tengu_toasty_breeze Flag reading movedThe flag server now returns {"enabled":false,"version":0} for tengu_toasty_breeze, read as this account.
v2.1.239tengu_toasty_breeze Flag reading movedThe flag server now returns {"enabled":false,"version":0} for tengu_toasty_breeze, read as this account.
v2.1.248tengu_nifty_lemur Flag reading movedThe flag server now returns {"enabled":false,"version":0} for tengu_nifty_lemur, read as this account.
v2.1.248tengu_nifty_lemur Flag reading movedThe flag server now returns {"enabled":false,"version":0} for tengu_nifty_lemur, read as this account.
v2.1.223tengu_juniper_relay Flag reading movedThe flag server now returns off for tengu_juniper_relay, read as this account.
v2.1.251tengu_juniper_relay Flag reading movedThe flag server now returns off for tengu_juniper_relay, read as this account.
v2.1.277builtin Documentation arrivedAnthropic's documentation has since written up builtin, on Telemetry and egress.
the line in the docs

| Web Fetch domain check in [Code](/docs/third-party/claude-desktop/code) sessions | The hostname of each page Claude Code fetches, sent to `api.anthropic.com` before the fetch. See [Web Fetch](/docs/third-party/claude-desktop/web-tools#we…
v2.1.274--model Documentation arrivedAnthropic's documentation has since written up --model, on Model configuration.
the line in the docs

The plan-mode Opus phase uses the same context window as the `opus` model setting, and the execution phase uses the same window as `sonnet`. When `opus` and `sonnet` resolve to models that run with the [1M context window](#extended-context…
v2.1.275SKILL.md Documentation arrivedA small documentation edit on Skills in Claude Desktop touched a line naming SKILL.md after this was published.
the line in the docs

**Write the skill.** A skill is a folder named after the skill, holding a `SKILL.md` file. The file starts with YAML frontmatter carrying `name` and `description`, followed by the instructions as markdown. The folder name must match the `n…
v2.1.257SKILL.md Documentation arrivedA small documentation edit on Skills in Claude Desktop touched a line naming SKILL.md after this was published.
the line in the docs

**Write the skill.** A skill is a folder named after the skill, holding a `SKILL.md` file. The file starts with YAML frontmatter carrying `name` and `description`, followed by the instructions as markdown. The folder name must match the `n…
v2.1.206tengu_umber_kestrel Flag reading movedThe flag server now returns on for tengu_umber_kestrel, read as this account.
v2.1.239tengu_toasty_breeze Flag reading movedThe flag server now returns {"allowanceNote":"{percent} allowance left","budgetExhaustedCopy":"You've used this week's lower-priority allowance","cooloffMinutes":10,"enabled":true,"label":"Continue now at lower priority","noticeLine":"/low-priority to continue now at lower priority · uses your weekly limit","statusLine":"Lower priority until {reset}","version":3,"waitBanner":"Working at lower priority · waiting for capacity"} for tengu_toasty_breeze, read as this account.
v2.1.239tengu_toasty_breeze Flag reading movedThe flag server now returns {"allowanceNote":"{percent} allowance left","budgetExhaustedCopy":"You've used this week's lower-priority allowance","cooloffMinutes":10,"enabled":true,"label":"Continue now at lower priority","noticeLine":"/low-priority to continue now at lower priority · uses your weekly limit","statusLine":"Lower priority until {reset}","version":3,"waitBanner":"Working at lower priority · waiting for capacity"} for tengu_toasty_breeze, read as this account.
v2.1.248tengu_nifty_lemur Flag reading movedThe flag server now returns {"autoContinue":true,"enabled":true,"label":"Reset your session limit now","noticeLine":"/limit-reset to reset your session limit now · uses weekly limit · 1/week","spentLine":"Weekly reset used · available again {date}","successLine":"Session limit reset · next reset available {date} · your weekly limit still applies","unavailableLine":"Couldn't reset your session limit right now · try again in a moment","version":1} for tengu_nifty_lemur, read as this account.
v2.1.248tengu_nifty_lemur Flag reading movedThe flag server now returns {"autoContinue":true,"enabled":true,"label":"Reset your session limit now","noticeLine":"/limit-reset to reset your session limit now · uses weekly limit · 1/week","spentLine":"Weekly reset used · available again {date}","successLine":"Session limit reset · next reset available {date} · your weekly limit still applies","unavailableLine":"Couldn't reset your session limit right now · try again in a moment","version":1} for tengu_nifty_lemur, read as this account.
v2.1.223tengu_juniper_relay Flag reading movedThe flag server now returns on for tengu_juniper_relay, read as this account.
v2.1.251tengu_juniper_relay Flag reading movedThe flag server now returns on for tengu_juniper_relay, read as this account.
v2.1.277tengu_ccr_keepalive_after_stop_enabled Flag reading movedThe flag server now returns on for tengu_ccr_keepalive_after_stop_enabled, read as this account.
v2.1.206tengu_umber_kestrel Flag reading movedThe flag server now returns off for tengu_umber_kestrel, read as this account.
v2.1.239tengu_toasty_breeze Flag reading movedThe flag server now returns {"enabled":false,"version":0} for tengu_toasty_breeze, read as this account.
v2.1.239tengu_toasty_breeze Flag reading movedThe flag server now returns {"enabled":false,"version":0} for tengu_toasty_breeze, read as this account.
v2.1.248tengu_nifty_lemur Flag reading movedThe flag server now returns {"enabled":false,"version":0} for tengu_nifty_lemur, read as this account.
v2.1.248tengu_nifty_lemur Flag reading movedThe flag server now returns {"enabled":false,"version":0} for tengu_nifty_lemur, read as this account.
v2.1.223tengu_juniper_relay Flag reading movedThe flag server now returns off for tengu_juniper_relay, read as this account.
v2.1.251tengu_juniper_relay Flag reading movedThe flag server now returns off for tengu_juniper_relay, read as this account.
v2.1.206tengu_umber_kestrel Flag reading movedThe flag server now returns on for tengu_umber_kestrel, read as this account.
v2.1.239tengu_toasty_breeze Flag reading movedThe flag server now returns {"allowanceNote":"{percent} allowance left","budgetExhaustedCopy":"You've used this week's lower-priority allowance","cooloffMinutes":10,"enabled":true,"label":"Continue now at lower priority","noticeLine":"/low-priority to continue now at lower priority · uses your weekly limit","statusLine":"Lower priority until {reset}","version":3,"waitBanner":"Working at lower priority · waiting for capacity"} for tengu_toasty_breeze, read as this account.
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