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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
Unofficial · read from every shipped build

Every change in Claude Code, read from the build itself.

Every published build is pulled off npm within minutes, unpacked, and diffed against the one before it at the syntax-tree level. Anything the bundle can back up gets an entry, and the strings it came from go with it. Anthropic's own notes for the same build usually run to a few bullets.

Try CLAUDE_CODE_DIFF_COPY_ROOT CLAUDE_CODE_DISABLE_LAUNCHER_SIGN_IN CLAUDE_CODE_IGNORE_PERSISTED_TRUST CLAUDE_CODE_SPAWNED_BY_SERVER CLAUDE_CODE_SUBAGENT_HISTORY

527builds read
26,693entries written
1,777read as switched off
5,592names in the reference
1,671docs pages tracked
MCP server · 15 tools

The whole corpus, in your client.

A hosted MCP server for Claude Code: 15 tools over one URL, answering every changelog, every mined flag and setting name, Anthropic's own documentation and the stock system prompts. No API key, no account, no install step beyond the address itself.

The address https://changelogs.core-directive.com/mcp that is the whole install
Add it in one line →

Where to go

Releases527builds

Every version, the day it ships

Newest v2.1.307 · 333 entries
Latest Archive What changed since Search
Reference5,592names

Every flag, setting and switch

flag2,081 setting1,548 env1,448 cli272 slash147 tool35 hook33 model28
Newest name CLAUDE_CODE_DIFF_COPY_ROOT first seen in v2.1.307
What changed since12,969events

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.

Newest tengu_smooth_chipmunk Flag reading moved, v2.1.282
Prompts177versions

The system prompt, release by release

Latest capture v2.1.308
Latest Injected Every capture
Mods

Building on the plugin hooks runtime

Every noun, verb, event and type on $.

Mods Guide Mods API
Docs changes1,671pages

Anthropic's documentation, diffed as it moves

Claude Code CLI, Claude Developer Platform, Claude Documentation, Model Context Protocol.

Newest #18461 claude-science/changelog +4 −0
Reading

The longer view

1 feature story, 2 blog posts.

Story Plugins, from an install command to a governed marketplace
Feature stories Blog
Charts

Cadence, size and cost over time

Aug29 Sep27 Oct20
Catch up

What changed since your version?

Pick the build you're on.

→ 2.1.308
10releases crossed
141Use it now
2,170entries
439 340 272 214 3 371 252 2 276 1

Bar height is entries per release. Hover one for its summary.

141Use it now 1,165You'll notice 82Nothing to try yet 782Under the hood
Elsewhere146 Plugins133 MCP119 Sessions116 Cloud Sessions111 Sandbox91

Newest release with anything in it

Read the whole build →

v2.1.307

Official 43 · 333 entries · 8 switched off

Claude Code can now use the claude.ai sign-in passed over by the desktop app that started it. That lent sign-in works like CLAUDE_CODE_OAUTH_TOKEN, but plugins cannot use it…

25Use it now 189You'll notice 11Nothing to try yet 108Under the hood
Most worth reading
  1. A list of earlier subagents in a session, off unless switched on Subagents5
  2. Notice about Fable usage credit for two periods Usage & Limits5
  3. A held variant of compact mode for auto mode, with an environment variable Auto Mode4
  4. Background agent summaries can be written by a separate model Subagents4
  5. Hidden option lets a self-hosted runner declare what it can handle Self-Hosted Runner4

Every build before it

60 newest All 527 in the archive →
/
60 builds
BuildReleasedKindsTiers EntriesWhat the read foundAnthropic
v2.1.308 +1 1 Official 1
v2.1.307 +306✓14◌13 333 Claude Code can now use the claude.ai sign-in passed over by the desktop app that started it. That lent sign-in works like CLAUDE_CODE_OAUTH_TOKEN, but plugins cannot use it… Official 43
v2.1.306 +2 2 Claude Code now reads a token from its standard credential file in local sessions too. Before this, it only read that file when CLAUDE_CODE_REMOTE was set, the variable that marks… Official 2
v2.1.305 +266✓21◌23 310 Claude can now upload a local file to Google Drive by naming it, up to 10 MB. Claude Code reads the file only after you approve the call. In remote sessions that support it, you… Official 38
v2.1.304 +419✓19◌10 448 Claude Code's bundled default model is now Opus 5.5 at medium effort, replacing Opus 5 at high effort. You can set CLAUDE_CODE_SKIP_PLUGIN_LOCAL_MCP_SERVERS to keep only the… Official 76
v2.1.303 +5 5 Claude Code now refuses to trust four blocked root certificates, wherever they come from. They are dropped from every certificate source, including a file you point to with… Official 1
v2.1.302 +249✓16◌4 269 A bundled chart plugin now lets Claude draw charts right in the transcript. It also charts metrics from MCP tools automatically, and the Auto charts switch in /config controls… Official 63
v2.1.301 +283✓29◌9 321 You can now set CLAUDE_CODE_RETRY_WATCHDOG_MAX_USAGE_LIMIT_WAIT_MS to make a request fail instead of waiting past that time after hitting a usage limit. This release has 272… Official 51
v2.1.300 +379✓22◌7 408 Sessions can now start in a sandbox VM by default when an option is set. The new --unsandboxed flag opts out of that and of cloud-by-default too. Setting… Official 88
v2.1.299 +462✓45◌22 529 You can now set subagentInheritVerifiedTurns to true so subagents start with your earlier verified messages. MCP servers can now provide skills to Claude Code. Each skill's size… Official 190
v2.1.296 +315✓41◌14 370 MCP tools that take file inputs can now accept local file paths. Claude Code uploads the file and passes the tool a reference instead. The Read tool's new allow_large option… Official 79
v2.1.295 +430✓40◌15 485 Setting CLAUDE_CODE_RESTRICT_PERSONAL_CONFIG now stops your own skills, agents and hooks from widening permissions. In that mode, errors in your user settings file block every… Official 143
v2.1.294 +5◌1 6 Hooks that ask a model to judge an action now treat its answer as a plain allow or block. An "ok" value of true lets the action go ahead, and false stops it. Prompt hooks now ask… Official 2
v2.1.293 +314✓19◌5 338 The haiku model name now picks Claude Haiku 5.5 on Anthropic's own API. Bedrock, Vertex and other providers stay on Haiku 4.5. Haiku 5.5 has a 1M-token context window and its own… Official 56
v2.1.292 +354✓29◌9 392 You can now name backup models in the new accessFallbackModels setting, for use when the main model can't be used. A new per-server disableAutoBackground option stops Claude Code… Official 92
v2.1.291 +7✓1◌2 10 Session transcripts now load in a single pass again when you resume, without pausing or retrying. Claude Code no longer stops partway to let the interface catch up. It also no… Official 2
v2.1.290 +569✓41◌10 620 You can now stop Claude Code compacting a long conversation while you sit idle by setting idleCompaction to false. The CLAUDE_CODE_IDLE_COMPACT_MIN_TOKENS variable sets how large… Official 190
v2.1.289 +57✓10 67 You can now let plugins read the text you have selected in a connected app, in sessions without a terminal. The first non-empty answer that arrives within 5 seconds is used… Official 27
v2.1.288 +369✓35◌21 425 You can now hold project settings changes made from a cloud session until you approve them, by running claude apply-project-settings in that folder. This applies when your… Official 89
v2.1.287 +485✓36◌5 526 You can now run gh api REST calls in sessions that do not have the GitHub CLI installed. Claude Code supplies its own limited gh and sends those calls through the session's… Official 106
v2.1.286 +298✓27◌23 348 You can now rely on a built-in security plugin to keep your deny rules in force when other plugins try to lift them. It can also refuse plugins that did not come from your… Official 88
v2.1.285 +454✓31◌18 503 You can now use claude-sonnet-5 with high effort and automatic thinking switched on by default. The high effort option is now labelled Recommended instead of Default. Admins can… Official 136
v2.1.284 +372✓42◌20 434 You can now use Sonnet 5.5 by choosing sonnet on the Anthropic API, where it replaces Sonnet 5. Bedrock, Vertex and other providers still get their older models under that name… Official 100
v2.1.283 +423✓40◌23 486 You can now have a new bundled skill write live mods that reload inside your session once you agree. A mod is a plugin that adds panes, status lines, toasts or hooks to Claude… Official 94
v2.1.282 +363✓44◌23 430 You can now set maxProseWidth to wrap Claude's text replies at a fixed column width, while code and tables keep the full terminal width. Claude Code now retries once on the same… Official 86
v2.1.281 +1167✓54◌19 1,240 Of this build's 31 gated additions, none are switched on yet. They include code for a headless claude -p --cloud run whose enabling switch returns false, and an Anthropic plugin… Official 177
v2.1.280 +687✓51◌33 771 Twelve of this build's 27 gated additions stay out of reach. A warning for dispatching multiple write-capable agents into the same directory sits unreleased alongside a new… Official 114
v2.1.278 +21✓1◌5 27 This build's seven gated additions cluster around a single unreleased feature: a billing notice warning some users that auto mode is still charging them for classifier requests… Official 2
v2.1.277 +446✓54◌27 527 This build carries 33 gated additions that stay out of reach. AGENTS.md fallback now becomes the default instruction-file mode when a project has no CLAUDE.md, with the… Official 87
v2.1.276 +1✓1 2 Model-advisor's standby model selection now checks not just whether a fallback model is available but whether the account is actually talking to Anthropic's own API before picking… Official 1
v2.1.275 +374✓42◌48 464 This build carries 54 gated additions that stay out of reach. The largest is a new post-turn memory system: a 'memory' settings layer plus an MCP tool for writing, reading… Official 95
v2.1.274 +363✓41◌21 425 This build carries 28 gated additions that stay out of reach. A pasted-content wrapping tag can mark text as untrusted content, but the killswitch tengu_virtual_pancake defaults… Official 108
v2.1.273 +232✓36◌10 278 This build carries 15 gated additions, none of them reachable yet. A new OAuth scope, user:plugins, is requested only when PLUGINS_SCOPE_REGISTERED is set, and remote teleport… Official 64
v2.1.272 +14✓1◌3 18 This build adds a new AppifactRepl tool that runs a full JavaScript program against an Artifact's data in one shot instead of one call at a time, including a claude.see() helper… Official 1
v2.1.271 +521✓32◌14 567 This build carries 35 gated additions that stay out of reach. A new turn_handoff protocol lets a session hand off an in-progress turn, including one with pending tool calls, to a… Official 96
v2.1.270 +1◌1 2 This build adds a bypass to the refusal-fallback "silent rearm" system, letting Claude Code re-offer a fallback model for bio-category refusals even after a user has already… Official 1
v2.1.269 +432✓68◌18 518 This build carries 25 gated additions that stay switched off. A new 'bashEditDiff' system snapshots the repo around Bash commands to track their file changes, controlled by an env… Official 98
v2.1.268 +346✓52◌24 422 This build carries 26 dormant additions, most left unswitched. A new allowed_domains parameter lets the model tell a sandboxed Bash, PowerShell, or Monitor command which network… Official 96
v2.1.267 +291✓45◌30 366 This build carries 36 dormant additions, none of them switched on yet. The largest thread is around artifacts: a new asset store for uploading, listing, reading and deleting… Official 53
v2.1.266 +2◌1 3 The Cloud gateway sign-in error message got trimmed this release, dropping the instructions that used to point to the CLAUDE_CODE_USE_GATEWAY, ANTHROPIC_BASE_URL and… Official 1
v2.1.265 +442✓38◌31 511 This build carries 50 gated additions with nothing switched on, the largest a new "tether" request-threading protocol that would let the API thread requests together server-side… Official 50
v2.1.263 +10◌4 14 This build carries eight dormant additions, none of them reachable yet. A hidden environment-variable switch called tengu_polished_dewdrop can make certain responses silently drop… Official 1
v2.1.261 +140✓30◌19 189 This build carries 17 dormant additions, most switched off behind hardcoded flags. Real-time PR webhook updates exist but are hardcoded off, so PR monitoring still polls every 30… Official 67
v2.1.260 +339✓36◌25 400 This build carries 42 gated entries, most not switched on. A hidden 'advisor' local command exists to let Claude consult a stronger model, but it stays off unless internal gates… Official 66
v2.1.259 +171✓26◌13 210 Eighteen entries in this build sit behind flags or unfinished wiring. Plugin hooks can now be written as real JS modules, but they stay off unless… Official 37
v2.1.258 +3 3 Official 2
v2.1.257 +413✓78◌34 525 Forty-seven items sit in this build without a way to reach them yet. A Mythos 5.1 model has been added to the catalog with a 1M context window and max effort levels, and the… Official 104
v2.1.252 +19✓4 23 Four features sit in this build without a way to reach them yet. A new "instructionFiles" context channel exists behind the carved-slate flag, part of a static system-prompt… Official 4
v2.1.251 +314✓5◌59 378 Sixty-four entries sit in this build without a way to reach them. Live presence on artifacts, which tracks who is viewing one over a websocket, turns on only with the remote flag… Official 71
v2.1.250 +9✓1◌5 15 Five entries land the reconnection rework for live artifact watches without switching it on. Lease mode, the flag tengu_slate_lantern_ember, defaults to off, so a stock build… Official 1
v2.1.248 +720✓28◌128 876 A weekly one-shot reset for the five-hour session limit is built but dark: it appears as a hidden /limit-reset command and a menu row only when the server-supplied config… Official 49
v2.1.247 +210✓30◌58 298 Several features are compiled into this build but cannot be reached yet, and 58 entries fall into that group. A new system-prompt block named willow_tern would tell the model to… Official 33
v2.1.246 +315✓38◌76 429 This build carries 68 gated or half-landed items, and a dozen are worth naming. Cloud sessions can seed from a plain folder by bundling it in-process, but the step is skipped… Official 61
v2.1.245 +1◌2 3 Both of this release's visible changes sit around /autofix-pr, the command that watches your current pull request and fixes problems it finds, and neither is switched on. The… Official 1
v2.1.243 +2◌1 3 This build carries the scaffolding for language-server support, but nothing in it turns that support on. There is a manager with start, restart and shutdown entry points, and none… Official 60
v2.1.242 +279✓19◌98 396 Several of the 99 unreleased entries center on plugin hook modules written in JavaScript: a plugin's hooks/hooks.json can name a module that registers hooks in code and talks to… No notes
v2.1.241 +4◌1 5 Claude Code now sends the VS Code extension a map of experiment flags at startup, and that map picks up an entry called tengu_sable_thrush, which tells the IDE whether narration… Official 1
v2.1.240 +3◌7 10 This build carries seven pieces of unreleased work, most of it about how the model's thinking is shown. The machinery to pick a thinking display mode is present, but the one path… Official 1
v2.1.239 +213✓25◌62 300 This build carries 64 features that are present but not reachable, most waiting on server-side flags. If you hit the 5-hour usage limit, a hidden /low-priority command could… Official 59
v2.1.238 +192✓25◌37 254 A large amount of artifact work sits in this build without a way to switch it on. The verify action, which lets Claude read console output, uncaught errors and failed resource… Official 39
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