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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.

Events22,542dated, and never edited afterwards
Newestthe last time anything moved
Flag readings moved17,190a reading is one sample, for one account
Documentation arrived5,242a docs edit touched an entry's names
WhenEntryWhat happened
v2.1.311allowedProviders Documentation arrivedAnthropic's documentation has since written up allowedProviders, on Claude Code changelog.
the line in the docs

* Fixed sessions being refused at startup by an `allowedProviders` list that another login on the same machine had stored
v2.1.317/logout Documentation arrivedAnthropic's documentation has since written up /logout, on Claude Code changelog.
the line in the docs

* Fixed `/logout`, `claude auth logout` and `claude mcp remove` reporting success, and changes to trust, consent or MCP settings being dropped with no word, when the config file could not be updated on a shared network home directory
v2.1.318tengu_velvet_possum Flag reading movedThe flag server now returns nothing at all, having stopped carrying it for tengu_velvet_possum, read as this account.
v2.1.318tengu_velvet_possum Flag reading movedThe flag server now returns nothing at all, having stopped carrying it for tengu_velvet_possum, read as this account.
v2.1.312tengu_velvet_possum Flag reading movedThe flag server now returns nothing at all, having stopped carrying it for tengu_velvet_possum, read as this account.
v2.1.318tengu_curried_trinket Flag reading movedThe flag server now returns nothing at all, having stopped carrying it for tengu_curried_trinket, read as this account.
v2.1.318tengu_quiet_badger Flag reading movedThe flag server now returns off for tengu_quiet_badger, read as this account.
v2.1.318tengu_quiet_badger Flag reading movedThe flag server now returns on for tengu_quiet_badger, read as this account.
v2.1.318tengu_quiet_badger Flag reading movedThe flag server now returns off for tengu_quiet_badger, read as this account.
v2.1.295ENABLE_BETA_TRACING_DETAILED Documentation arrivedA small documentation edit on Monitoring touched a line naming ENABLE_BETA_TRACING_DETAILED after this was published.
the line in the docs

> Set `ENABLE_BETA_TRACING_DETAILED` only for debugging, not in production. Detailed beta tracing has a high export volume, and its [content attributes](#new-context-gates) aren't part of the stable span schema.
v2.1.315acceptEdits Documentation arrivedAnthropic's documentation has since written up acceptEdits, on Orchestrate teams of Claude Code sessions.
the line in the docs

> An in-process teammate that isn't in [plan mode](#have-teammates-plan-before-implementing) runs in the lead's mode while the lead is in [`acceptEdits`](https://code.claude.com/docs/en/permission-modes#auto-approve-file-edits-with-accepte…
v2.1.315dontAsk Documentation arrivedAnthropic's documentation has since written up dontAsk, on Orchestrate teams of Claude Code sessions.
the line in the docs

You can't set per-teammate permission modes at spawn time. A new teammate starts with the lead's mode, including `bypassPermissions` mode, which `--dangerously-skip-permissions` turns on. If the lead is in [`dontAsk` mode](https://code.cla…
v2.1.315dontAsk Documentation arrivedAnthropic's documentation has since written up dontAsk, on Orchestrate teams of Claude Code sessions.
the line in the docs

You can't set per-teammate permission modes at spawn time. A new teammate starts with the lead's mode, including `bypassPermissions` mode, which `--dangerously-skip-permissions` turns on. If the lead is in [`dontAsk` mode](https://code.cla…
v2.1.299onFailure Documentation arrivedA small documentation edit on Agent SDK reference - TypeScript touched a line naming onFailure after this was published.
the line in the docs

onFailure?: "continue" | "block"; // "block" blocks the action when a callback fails
v2.1.296onFailure Documentation arrivedA small documentation edit on Agent SDK reference - TypeScript touched a line naming onFailure after this was published.
the line in the docs

onFailure?: "continue" | "block"; // "block" blocks the action when a callback fails
v2.1.295onFailure Documentation arrivedA small documentation edit on Agent SDK reference - TypeScript touched a line naming onFailure after this was published.
the line in the docs

onFailure?: "continue" | "block"; // "block" blocks the action when a callback fails
v2.1.295onFailure Documentation arrivedA small documentation edit on Agent SDK reference - TypeScript touched a line naming onFailure after this was published.
the line in the docs

onFailure?: "continue" | "block"; // "block" blocks the action when a callback fails
v2.1.314PreCompact Documentation arrivedAnthropic's documentation has since written up PreCompact, on Intercept and control agent behavior with hooks.
the line in the docs

A callback that exceeds its timeout follows [Hook timeout](#hook-timeout). With `"block"` set, a timeout also blocks `PreCompact`, `Elicitation`, and `WorktreeCreate`.
v2.1.296on_failure Documentation arrivedAnthropic's documentation has since written up on_failure, on Intercept and control agent behavior with hooks.
the line in the docs

| `onFailure` | `"continue" \| "block"` | `undefined` | What a failed callback does. Set `"block"` to [block the action when a callback fails](#block-the-action-when-a-callback-fails). In Python, use `on_failure` |
v2.1.318tengu_quiet_badger Flag reading movedThe flag server now returns on for tengu_quiet_badger, read as this account.
v2.1.314effortLevel Documentation arrivedA small documentation edit on CLI reference touched a line naming effortLevel after this was published.
the line in the docs

| `--effort` | Set the [effort level](https://code.claude.com/docs/en/model-config.md#adjust-effort-level) for the current session. Options: `low`, `medium`, `high`, `xhigh`, `max`, or `ultracode`. Available levels depend on the model. `ul…
v2.1.295--effort Documentation arrivedA small documentation edit on CLI reference touched a line naming --effort after this was published.
the line in the docs

| `--effort` | Set the [effort level](https://code.claude.com/docs/en/model-config.md#adjust-effort-level) for the current session. Options: `low`, `medium`, `high`, `xhigh`, `max`, or `ultracode`. Available levels depend on the model. `ul…
v2.1.304/workflows Documentation arrivedA small documentation edit on CLI reference touched a line naming /workflows after this was published.
the line in the docs

| `--effort` | Set the [effort level](https://code.claude.com/docs/en/model-config.md#adjust-effort-level) for the current session. Options: `low`, `medium`, `high`, `xhigh`, `max`, or `ultracode`. Available levels depend on the model. `ul…
v2.1.282tengu_smooth_chipmunk Flag reading movedThe flag server now returns off for tengu_smooth_chipmunk, read as this account.
v2.1.281tengu_smooth_chipmunk Flag reading movedThe flag server now returns off for tengu_smooth_chipmunk, read as this account.
v2.1.281tengu_smooth_chipmunk Flag reading movedThe flag server now returns off for tengu_smooth_chipmunk, read as this account.
v2.1.269tengu_smooth_chipmunk Flag reading movedThe flag server now returns off for tengu_smooth_chipmunk, read as this account.
v2.1.261tengu_smooth_chipmunk Flag reading movedThe flag server now returns off for tengu_smooth_chipmunk, read as this account.
v2.1.261tengu_smooth_chipmunk Flag reading movedThe flag server now returns off for tengu_smooth_chipmunk, read as this account.
v2.1.317tengu_glowing_lark Flag reading movedThe flag server now returns off for tengu_glowing_lark, read as this account.
v2.1.299tengu_glowing_lark Flag reading movedThe flag server now returns off for tengu_glowing_lark, read as this account.
v2.1.299tengu_glowing_lark Flag reading movedThe flag server now returns off for tengu_glowing_lark, read as this account.
v2.1.265tengu_curious_tower_stateless_models Flag reading movedThe flag server now returns "fable-5-1, opus-5, opus-4-8" for tengu_curious_tower_stateless_models, read as this account.
v2.1.282tengu_smooth_chipmunk Flag reading movedThe flag server now returns on for tengu_smooth_chipmunk, read as this account.
v2.1.281tengu_smooth_chipmunk Flag reading movedThe flag server now returns on for tengu_smooth_chipmunk, read as this account.
v2.1.281tengu_smooth_chipmunk Flag reading movedThe flag server now returns on for tengu_smooth_chipmunk, read as this account.
v2.1.269tengu_smooth_chipmunk Flag reading movedThe flag server now returns on for tengu_smooth_chipmunk, read as this account.
v2.1.261tengu_smooth_chipmunk Flag reading movedThe flag server now returns on for tengu_smooth_chipmunk, read as this account.
v2.1.261tengu_smooth_chipmunk Flag reading movedThe flag server now returns on for tengu_smooth_chipmunk, read as this account.
v2.1.317tengu_glowing_lark Flag reading movedThe flag server now returns on for tengu_glowing_lark, read as this account.
v2.1.299tengu_glowing_lark Flag reading movedThe flag server now returns on for tengu_glowing_lark, read as this account.
v2.1.299tengu_glowing_lark Flag reading movedThe flag server now returns on for tengu_glowing_lark, read as this account.
v2.1.265tengu_curious_tower_stateless_models Flag reading movedThe flag server now returns "" for tengu_curious_tower_stateless_models, read as this account.
v2.1.318tengu_deep_locket Gate removed from the codev2.1.318 removed the tengu_deep_locket gate from the code while it was still reading on for the account this site reads.
v2.1.314fable Documentation arrivedA small documentation edit on Or, for Claude Mythos 5.1, which offers the same capabilities to verified organizations: touched a line naming fable after this was published.
the line in the docs

2. **Change instructions and tools with mid-conversation system messages:** To change instructions or tools partway through a session, append a [`role: "system"` message](https://platform.claude.com/docs/en/build-with-claude/mid-conversati…
v2.1.317tengu_limber_finch Flag reading movedThe flag server now returns nothing at all, having stopped carrying it for tengu_limber_finch, read as this account.
v2.1.311tengu_wobbly_petal Flag reading movedThe flag server now returns {"sdkHosts":true,"sessionModelFamilies":["sonnet","opus","haiku","fable","other"]} for tengu_wobbly_petal, 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.
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