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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.

Events22,554dated, and never edited afterwards
Newestthe last time anything moved
Flag readings moved17,196a reading is one sample, for one account
Documentation arrived5,248a docs edit touched an entry's names
WhenEntryWhat happened
v2.1.283/loop Documentation arrivedAnthropic's documentation has since written up /loop, on Claude Code changelog.
the line in the docs

* Fixed `/loop` status updates in self-paced mode often not being shown because Claude wrote them only in its reasoning; Claude now writes each update, and the outcome when the loop stops, as visible text
v2.1.282/upgrade Documentation arrivedAnthropic's documentation has since written up /upgrade, on Claude Code changelog.
the line in the docs

* Fixed usage-limit warnings suggesting `/upgrade` to users already on the highest Max plan; the warnings and `/upgrade` itself now point at `/usage-credits` when it is available
v2.1.280SendMessage Documentation arrivedAnthropic's documentation has since written up SendMessage, on Claude Code changelog.
the line in the docs

* Fixed sessions launched without the `SendMessage` tool (such as by Claude Desktop) still being told to message other sessions with it
v2.1.283ElicitationResult Documentation arrivedAnthropic's documentation has since written up ElicitationResult, on Claude Code changelog.
the line in the docs

* Fixed `{"decision":"block"}` returned by Elicitation and ElicitationResult hooks being ignored; it now declines the MCP elicitation, as exit code 2 does
v2.1.283Elicitation Documentation arrivedAnthropic's documentation has since written up Elicitation, on Claude Code changelog.
the line in the docs

* Fixed `{"decision":"block"}` returned by Elicitation and ElicitationResult hooks being ignored; it now declines the MCP elicitation, as exit code 2 does
v2.1.283claude plugin install Documentation arrivedAnthropic's documentation has since written up claude plugin install, on Claude Code changelog.
the line in the docs

* Fixed a failed first `claude plugin install` leaving the plugin enabled and recorded when a dependency's version range could not be met
v2.1.282claude plugin install Documentation arrivedAnthropic's documentation has since written up claude plugin install, on Claude Code changelog.
the line in the docs

* Fixed a failed first `claude plugin install` leaving the plugin enabled and recorded when a dependency's version range could not be met
v2.1.282claude plugin install Documentation arrivedAnthropic's documentation has since written up claude plugin install, on Claude Code changelog.
the line in the docs

* Fixed a failed first `claude plugin install` leaving the plugin enabled and recorded when a dependency's version range could not be met
v2.1.283allowed-tools Documentation arrivedAnthropic's documentation has since written up allowed-tools, on Claude Code changelog.
the line in the docs

* Fixed plugins from marketplaces, claude.ai and npm pre-approving their own tools via `allowed-tools` under managed `allowManagedPermissionRulesOnly`; only plugins from an official Anthropic source or a source that managed settings vouch …
v2.1.282allowed-tools Documentation arrivedAnthropic's documentation has since written up allowed-tools, on Claude Code changelog.
the line in the docs

* Fixed plugins from marketplaces, claude.ai and npm pre-approving their own tools via `allowed-tools` under managed `allowManagedPermissionRulesOnly`; only plugins from an official Anthropic source or a source that managed settings vouch …
v2.1.283claude mcp add Documentation arrivedAnthropic's documentation has since written up claude mcp add, on Claude Code changelog.
the line in the docs

* Fixed `claude mcp add` reporting success when managed settings restrict MCP servers to plugins; it now refuses and says what to do, instead of saving a server that never loads
v2.1.283/extra-usage Documentation arrivedAnthropic's documentation has since written up /extra-usage, on Claude Code changelog.
the line in the docs

* Fixed repeated calls to the plan-usage endpoint after it rate-limits or rejects your login: `/usage`, `/extra-usage` and IDE usage views now back off instead of re-asking
v2.1.283/rate-limit-options Documentation arrivedAnthropic's documentation has since written up /rate-limit-options, on Claude Code changelog.
the line in the docs

* Added `/rate-limit-options` to `/help` and the command menu for claude.ai subscribers, so the usage-limit notices that mention it point to a command you can find
v2.1.283/context Documentation arrivedA small documentation edit on claude-on-vertex-ai touched a line naming /context after this was published.
the line in the docs

Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5.5, Claude Sonnet 5, and Claude Sonnet 4.6 have a [1M-token context window](https://platform.claude.com/doc…
v2.1.251tengu_cobalt_plinth_linden Flag reading movedThe flag server now returns on for tengu_cobalt_plinth_linden, read as this account.
v2.1.283modelOverrides Documentation arrivedAnthropic's documentation has since written up modelOverrides, on Model configuration.
the line in the docs

* Claude Code must recognize the current model as a fallback source. Fable 5.1 and Fable 5 are recognized when the model ID contains `claude-fable-5`, matches the value of `ANTHROPIC_DEFAULT_FABLE_MODEL`, or is mapped with [`modelOverrides…
v2.1.283ANTHROPIC_DEFAULT_OPUS_MODEL Documentation arrivedAnthropic's documentation has since written up ANTHROPIC_DEFAULT_OPUS_MODEL, on Model configuration.
the line in the docs

* An Opus target must resolve in your deployment, whichever model refused: set `ANTHROPIC_DEFAULT_OPUS_MODEL`, or keep an Opus 4.8 entry in the provider's model list. Without one, fallback stays off for every source model, including Sonnet…
v2.1.283/context Documentation arrivedAnthropic's documentation has since written up /context, on Model configuration.
the line in the docs

| **`sonnet[1m]`** | Uses Sonnet with a [1 million token context window](https://platform.claude.com/docs/en/build-with-claude/context-windows#context-window-sizes-by-model) for long sessions. No effect when `sonnet` already resolves to So…
v2.1.283claude update Documentation arrivedAnthropic's documentation has since written up claude update, on Error reference.
the line in the docs

* Run `claude update` and restart Claude Code. Opus 4.7 needs v2.1.111 or later. Opus 4.8 needs v2.1.154 or later. Sonnet 5 needs v2.1.197 or later. Opus 5 needs v2.1.219 or later. Opus 5.5 needs v2.1.280 or later. Sonnet 5.5 needs v2.1.28…
v2.1.283/model Documentation arrivedA small documentation edit on Manage costs effectively touched a line naming /model after this was published.
the line in the docs

For simpler tasks where deep reasoning isn't needed, you can reduce costs by lowering the [effort level](/docs/en/model-config#adjust-effort-level) with `/effort` or in `/model`, or by disabling thinking in `/config`. You can't turn off th…
v2.1.283/model Documentation arrivedA small documentation edit on Manage costs effectively touched a line naming /model after this was published.
the line in the docs

For simpler tasks where deep reasoning isn't needed, you can reduce costs by lowering the [effort level](/docs/en/model-config#adjust-effort-level) with `/effort` or in `/model`, or by disabling thinking in `/config`. You can't turn off th…
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.
v2.1.221tengu_mcp_protocol_negotiation_stdio Flag reading movedThe flag server now returns on for tengu_mcp_protocol_negotiation_stdio, read as this account.
v2.1.221tengu_mcp_protocol_negotiation_stdio Flag reading movedThe flag server now returns on for tengu_mcp_protocol_negotiation_stdio, read as this account.
v2.1.274tengu_mcp_protocol_negotiation_stdio Flag reading movedThe flag server now returns on for tengu_mcp_protocol_negotiation_stdio, read as this account.
v2.1.281tengu_mcp_legacy_url_elicitation Flag reading movedThe flag server now returns off for tengu_mcp_legacy_url_elicitation, read as this account.
v2.1.281tengu_mcp_legacy_url_elicitation Flag reading movedThe flag server now returns off for tengu_mcp_legacy_url_elicitation, read as this account.
v2.1.281tengu_mcp_legacy_url_elicitation Flag reading movedThe flag server now returns off for tengu_mcp_legacy_url_elicitation, read as this account.
v2.1.232tengu_lapis_anchor Flag reading movedThe flag server now returns "off" for tengu_lapis_anchor, 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.
v2.1.248tengu_ccr_no_subscriber_flush_ms Flag reading movedThe flag server now returns null for tengu_ccr_no_subscriber_flush_ms, read as this account.
v2.1.248tengu_ccr_no_subscriber_flush_ms Flag reading movedThe flag server now returns null for tengu_ccr_no_subscriber_flush_ms, read as this account.
v2.1.221tengu_mcp_protocol_negotiation_stdio Flag reading movedThe flag server now returns off for tengu_mcp_protocol_negotiation_stdio, read as this account.
v2.1.221tengu_mcp_protocol_negotiation_stdio Flag reading movedThe flag server now returns off for tengu_mcp_protocol_negotiation_stdio, read as this account.
v2.1.274tengu_mcp_protocol_negotiation_stdio Flag reading movedThe flag server now returns off for tengu_mcp_protocol_negotiation_stdio, read as this account.
v2.1.281tengu_mcp_legacy_url_elicitation Flag reading movedThe flag server now returns on for tengu_mcp_legacy_url_elicitation, read as this account.
v2.1.281tengu_mcp_legacy_url_elicitation Flag reading movedThe flag server now returns on for tengu_mcp_legacy_url_elicitation, read as this account.
v2.1.281tengu_mcp_legacy_url_elicitation Flag reading movedThe flag server now returns on for tengu_mcp_legacy_url_elicitation, read as this account.
v2.1.232tengu_lapis_anchor Flag reading movedThe flag server now returns "padded-countdown" for tengu_lapis_anchor, read as this account.
v2.1.248tengu_ccr_no_subscriber_flush_ms Flag reading movedThe flag server now returns 2000 for tengu_ccr_no_subscriber_flush_ms, read as this account.
v2.1.248tengu_ccr_no_subscriber_flush_ms Flag reading movedThe flag server now returns 2000 for tengu_ccr_no_subscriber_flush_ms, read as this account.
v2.1.283claude-opus-5-5 Documentation arrivedAnthropic's documentation has since written up claude-opus-5-5, on advisor-tool.
the line in the docs

| Claude Haiku 4.5 (claude-haiku-4-5) | Claude Mythos 5.1 (claude-mythos-5-1) Claude Fable 5.1 (claude-fable-5-1) Claude Mythos 5 (claude-mythos-5) Claude Fable 5 (claude-fable-5) Claude Opus 5.5 (claude-opus-5-5) Claude Opus 5 (claude-opu…
v2.1.283claude-opus-5 Documentation arrivedAnthropic's documentation has since written up claude-opus-5, on advisor-tool.
the line in the docs

| Claude Haiku 4.5 (claude-haiku-4-5) | Claude Mythos 5.1 (claude-mythos-5-1) Claude Fable 5.1 (claude-fable-5-1) Claude Mythos 5 (claude-mythos-5) Claude Fable 5 (claude-fable-5) Claude Opus 5.5 (claude-opus-5-5) Claude Opus 5 (claude-opu…
v2.1.282tengu_claudeai_skills_sync_shared_round Flag reading movedThe flag server now returns on for tengu_claudeai_skills_sync_shared_round, read as this account.
v2.1.282tengu_claudeai_skills_sync_shared_round Flag reading movedThe flag server now returns on for tengu_claudeai_skills_sync_shared_round, read as this account.
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