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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
v2.1.257permissionMode Documentation arrivedA small documentation edit on Plugins reference touched a line naming permissionMode after this was published.
the line in the docs

For security reasons, plugin-shipped agents don't support `hooks`, `mcpServers`, or `permissionMode`.
v2.1.266ANTHROPIC_BASE_URL Documentation arrivedAnthropic's documentation has since written up ANTHROPIC_BASE_URL, on Connect Claude Code to tools via MCP.
the line in the docs

A covered name reads as empty whether or not you have set the variable, and a `:-default` fallback on it is ignored. A provider base URL such as `ANTHROPIC_BASE_URL` still expands, so `"url": "${ANTHROPIC_BASE_URL}/mcp"` works, unless the …
v2.1.266ANTHROPIC_AUTH_TOKEN Documentation arrivedAnthropic's documentation has since written up ANTHROPIC_AUTH_TOKEN, on Connect Claude Code to tools via MCP.
the line in the docs

In a remote server's `url` and `headers`, Claude Code reads credential variables from your environment as empty rather than expanding them. This keeps a project's `.mcp.json` or a plugin from sending your Claude Code or cloud provider cred…
v2.1.261CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS Documentation arrivedAnthropic's documentation has since written up CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS, on Error reference.
the line in the docs

| [`CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS`](/docs/en/env-vars) | unset | Deadline in milliseconds for the first response byte of a streaming request. Requires Claude Code v2.1.242 or later. For how Claude Code picks the deadline when this is…
v2.1.261CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS Documentation arrivedAnthropic's documentation has since written up CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS, on Error reference.
the line in the docs

| [`CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS`](/docs/en/env-vars) | unset | Deadline in milliseconds for the first response byte of a streaming request. Requires Claude Code v2.1.242 or later. For how Claude Code picks the deadline when this is…
v2.1.261CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS Documentation arrivedAnthropic's documentation has since written up CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS, on Error reference.
the line in the docs

| [`CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS`](/docs/en/env-vars) | unset | Deadline in milliseconds for the first response byte of a streaming request. Requires Claude Code v2.1.242 or later. For how Claude Code picks the deadline when this is…
v2.1.242CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS Documentation arrivedAnthropic's documentation has since written up CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS, on Error reference.
the line in the docs

| [`CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS`](/docs/en/env-vars) | unset | Deadline in milliseconds for the first response byte of a streaming request. Requires Claude Code v2.1.242 or later. For how Claude Code picks the deadline when this is…
v2.1.261API_TIMEOUT_MS Documentation arrivedAnthropic's documentation has since written up API_TIMEOUT_MS, on Error reference.
the line in the docs

| [`API_TIMEOUT_MS`](/docs/en/env-vars) | 600000 | Per-request timeout in milliseconds. Raise it for slow networks or proxies. It also caps how long Claude Code waits for response headers, described in [No response from API](#no-response-f…
v2.1.242API_TIMEOUT_MS Documentation arrivedAnthropic's documentation has since written up API_TIMEOUT_MS, on Error reference.
the line in the docs

| [`API_TIMEOUT_MS`](/docs/en/env-vars) | 600000 | Per-request timeout in milliseconds. Raise it for slow networks or proxies. It also caps how long Claude Code waits for response headers, described in [No response from API](#no-response-f…
v2.1.267surface Documentation arrivedAnthropic's documentation has since written up surface, on Error reference.
the line in the docs

| [`CLAUDE_CODE_MAX_RETRIES`](/docs/en/env-vars) | 10 | Number of retry attempts. Capped at 15 as of v2.1.186; as of v2.1.199 `CLAUDE_CODE_RETRY_WATCHDOG` raises the default and removes the cap. Lower it to surface failures faster in scrip…
v2.1.248CLAUDE_CODE_MAX_RETRIES Documentation arrivedA small documentation edit on Environment variables touched a line naming CLAUDE_CODE_MAX_RETRIES after this was published.
the line in the docs

| `CLAUDE_CODE_RETRY_WATCHDOG` | Set to `1` for unattended sessions such as eval harnesses, CI jobs, or remote workers. Retries `429` and `529` capacity errors indefinitely instead of failing after `CLAUDE_CODE_MAX_RETRIES` attempts. Claud…
v2.1.260/sandbox Documentation arrivedAnthropic's documentation has since written up /sandbox, on Debug your configuration.
the line in the docs

| `Bash(rm *)` deny rule doesn't block `/bin/rm` or `find -delete` | Bash rules match the literal command string, not the underlying executable; see [what a Bash rule doesn't match](/docs/en/permissions#bash-rule-limits) | Use a [PreToolUs…
v2.1.238disable-model-invocation Documentation arrivedAnthropic's documentation has since written up disable-model-invocation, on Debug your configuration.
the line in the docs

| Skill appears in `/skills` but Claude never invokes it | Skill has `disable-model-invocation: true` in its frontmatter, or its description doesn't match how you phrase the request | Check the badge in `/skills`: a "user-only" label means…
v2.1.268modelPricing Documentation arrivedA small documentation edit on Manage costs effectively touched a line naming modelPricing after this was published.
the line in the docs

Set `multiplier` below 1 for a flat discount or above 1 for a markup, list each model's four per-token rates under `overrides`, or do both. A markup requires Claude Code v2.1.271 or later. The [`modelPricing` entry](/docs/en/settings-refer…
v2.1.246modelPricing Documentation arrivedA small documentation edit on Manage costs effectively touched a line naming modelPricing after this was published.
the line in the docs

Set `multiplier` below 1 for a flat discount or above 1 for a markup, list each model's four per-token rates under `overrides`, or do both. A markup requires Claude Code v2.1.271 or later. The [`modelPricing` entry](/docs/en/settings-refer…
v2.1.242modelPricing Documentation arrivedA small documentation edit on Manage costs effectively touched a line naming modelPricing after this was published.
the line in the docs

Set `multiplier` below 1 for a flat discount or above 1 for a markup, list each model's four per-token rates under `overrides`, or do both. A markup requires Claude Code v2.1.271 or later. The [`modelPricing` entry](/docs/en/settings-refer…
v2.1.242modelPricing Documentation arrivedA small documentation edit on Manage costs effectively touched a line naming modelPricing after this was published.
the line in the docs

Set `multiplier` below 1 for a flat discount or above 1 for a markup, list each model's four per-token rates under `overrides`, or do both. A markup requires Claude Code v2.1.271 or later. The [`modelPricing` entry](/docs/en/settings-refer…
v2.1.248/rename Documentation arrivedA small documentation edit on Use Claude Code on the web touched a line naming /rename after this was published.
the line in the docs

* **`/model`, `/effort`, `/color`, and `/rename`**: pass the value as an argument, for example `/model sonnet`, instead of opening the terminal picker or slider. The argument forms require Claude Code v2.1.205 or later in the session's env…
v2.1.268timeout_ms Documentation arrivedAnthropic's documentation has since written up timeout_ms, on Agent SDK reference - TypeScript.
the line in the docs

timeout_ms: number;
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.
v2.1.232tengu_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.
v2.1.206tengu_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.
v2.1.232tengu_lapis_anchor Flag reading movedThe flag server now returns "padded-countdown" for tengu_lapis_anchor, 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.
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.
v2.1.269tengu_quiet_heron Flag reading movedThe flag server now returns on for tengu_quiet_heron, read as this account.
v2.1.269tengu_quiet_heron Flag reading movedThe flag server now returns on for tengu_quiet_heron, 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.
v2.1.206tengu_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.
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