Feature flags, all 2,081.

tengu_account_skills_sync_enabled ◇ Account skills-sync eligibility logic generalized into a reusable descriptorv2.1.234 ○gone AND v2.1.235 tengu_agent_list_attach ◇ Default false. When CLAUDE_CODE_AGENT_LIST_IN_MESSAGES is unset or not a recognised boolean, true sends the Agent tool's list of agent types as agent_listing_delta attachments in the conversation (after the first, only the added and removed types) and leaves it out of the tool description. A truthy CLAUDE_CODE_DISABLE_ATTACHMENTS or CLAUDE_CODE_SIMPLE keeps the list in the description.v2.1.138 or earlier → v2.1.177 ○gone AND v2.1.178 tengu_agile_glade ◇ Usage reports about individual features can now be thinned out or dropped per feature by a server setting, without a new releasev2.1.293 → v2.1.308 ◆in the build AND v2.1.293 tengu_amber_redwood2 ◇ You can now set when auto-compaction kicks in with a new --autocompact flag, and /autocompact works for everyone.v2.1.138 or earlier → v2.1.308 ◆in the build AND v2.1.221 tengu_amber_redwood3 ◇ You can now set when auto-compaction kicks in with a new --autocompact flag, and /autocompact works for everyone.v2.1.154 → v2.1.308 ◆in the build AND v2.1.221 tengu_artifact_hljs_highlight ◇ Artifact syntax highlighting and mermaid diagrams are now always on; three other gates were renamed and stay off.v2.1.212 → v2.1.238 ○gone AND v2.1.239 tengu_artifact_mermaid_diagrams ◇ Artifact syntax highlighting and mermaid diagrams are now always on; three other gates were renamed and stay off.v2.1.202 → v2.1.238 ○gone AND v2.1.239 tengu_async_snowglobe ◇ Claude Code recognises a new local memory import background task and reads a stale note setting for memory from remote settingsnever mined ·never mined AND v2.1.286 tengu_atomic_ocean ◇ The gzip decision now records exactly why it skipped, though compression stays off without a server value.v2.1.236 → v2.1.287 ○gone AND v2.1.300 tengu_auto_mode_config ◇ Auto-mode permission checks can score risk 0-100 instead of yes/no, but only for configured models.v2.1.138 or earlier → v2.1.308 ◆in the build AND v2.1.307 tengu_ax_screen_reader ◇ The information Claude Code gives the auto mode safety check can now carry an extra marker, and a new prompt-screening step was addedv2.1.300 → v2.1.308 ◆in the build AND v2.1.295 tengu_bg_low_mem_mb ◇ Low-memory threshold in MiB for background sessions, code default 1024; 0 or less turns the check off. Outside macOS the machine counts as low on memory when the system memory reading is below the threshold; on macOS the value only switches the check on and macOS's critical memory-pressure level decides. While memory is low, the background-session supervisor retires settled workers sooner and before spawning a new session, stops prewarming, keeps no pre-started spare, and a worker that crashes before starting reports possibly low memory.v2.1.138 or earlier → v2.1.308 ◆in the build AND v2.1.232 tengu_bg_prewarm_burst_concurrency ◇ Background session prewarm now checks the concurrency limit instead of the delay value.v2.1.206 → v2.1.308 ◆in the build AND v2.1.248 tengu_bg_prewarm_burst_delay_ms ◇ Default 15000 (milliseconds). How long the background-session supervisor waits, once it is ready, before its prewarm burst: restarting idle background sessions on a stale Claude Code version onto the running one, tengu_bg_prewarm_burst_concurrency (default 3) at a time. The burst is skipped if the supervisor is shutting down, the concurrency is 0 or less, or tengu_bg_attach_upgrade is off.v2.1.206 → v2.1.308 ◆in the build AND v2.1.248 tengu_bg_prewarm_per_sweep ◇ The kite network transport is on by default everywhere, and CLAUDE_CODE_HARBOR_KITE=0 now really turns it off.v2.1.163 → v2.1.308 ◆in the build AND v2.1.248 tengu_binary_music ◇ Users with a one-million-token context can be offered a choice of when auto-compact kicks in, from 300k to 900k tokensv2.1.300 → v2.1.308 ◆in the build AND v2.1.301 tengu_birch_lantern ◇ Default "off". Picks how /powerup is advertised in a session where the first-run onboarding was shown: "banner" shows an info notice ("New here? Type /powerup for a 5-minute tour..."), "step" adds a "Learn the moves" step after onboarding that can launch the tour, and any other value shows neither. CLAUDE_CODE_POWERUP_ONBOARDING set to banner or step overrides the flag.v2.1.181 → v2.1.308 ◆in the build AND v2.1.181 tengu_bison_cairn ◇ Default false. When on, the system prompt includes the # Delivering work section (guidance on doing the requested scope, handling uncertainty mid-task and proceeding after the user reaffirms a request). The section is also included when the cached client data has tengu_bison_cairn: true, for models with the fable_5_1_prompt_bundle capability (except under certain entrypoints), and for models with the opus_5_prompt_bundle capability while tengu_fennel_godwit is off; CLAUDE_CODE_BISON_CAIRN set to a true or false value overrides all of these.never mined ·never mined AND v2.1.217 tengu_bramble_lintel ◇ When a pass that saves memories from your conversation stops early, the next pass looks at the same turns againv2.1.138 or earlier → v2.1.308 ◆in the build AND v2.1.305 tengu_breezy_pelican ◇ A token limit set to a fraction of the context window, by default one sixth, is built in and stays off unless switched on remotelyv2.1.292 → v2.1.308 ◆in the build AND v2.1.292 tengu_bridge_attestation_enforce ◇ Tool requests from a bridged device can now be refused before the tool runs, but no tool uses this yetv2.1.141 → v2.1.287 ○gone AND v2.1.288 tengu_bridge_attestation_enforce_config ◇ The switch that turns on device attestation enforcement for the bridge is read through a safer path, and its settings now come from several sourcesv2.1.141 → v2.1.296 ○gone AND v2.1.288 tengu_bridge_min_version ◇ Remote Control now checks your Claude Code version meets a minimum before accepting a remotely started sessionnever mined ·never mined AND v2.1.273 tengu_bridge_recover_stale_epoch ◇ Remote sessions gain reconnect and reactivation heartbeats plus stale-connection recovery, all off here.v2.1.228 → v2.1.233 ○gone AND v2.1.234 tengu_bridge_system_init ◇ A dormant bridge startup switch was removed entirely; it now always reports off and can't be turned on.v2.1.138 or earlier → v2.1.246 ○gone AND v2.1.247 tengu_bridge_unarchive_on_resume ◇ Resuming an older reaped session now unarchives it first instead of failing.v2.1.242 → v2.1.303 ○gone AND v2.1.228 tengu_bright_ripple ◇ Memory context fetching gains a new 'laptop' path alongside the existing cowork path, both currently inactivev2.1.271 → v2.1.276 ○gone AND v2.1.277 tengu_brisk_meadow ◇ Whether 'inline tools' are enabled is now decided by a consolidated check with environment-variable overridesnever mined ·never mined AND v2.1.280 tengu_buzzing_lightning ◇ A new AppifactRepl tool runs a full JavaScript program against an Artifact's data instead of one call at a timenever mined ·never mined AND v2.1.272 tengu_buzzing_pike ◇ Claude Code can compress the requests it sends to the model in gzip blocks, controlled by CLAUDE_CODE_GZIP_REQUEST_BODY_BLOCKS and off by defaultv2.1.287 → v2.1.308 ◆in the build AND v2.1.287 tengu_byte_stream_idle_timeout_ms ◇ If you leave the timeout variables unset, Claude Code can now take stream-idle and request timeouts from a received configurationv2.1.157 → v2.1.308 ◆in the build AND v2.1.299 tengu_cached_pebble ◇ Claude Code has a new remote switch that falls back to off when the server sends nothing, and what it controls is not knownv2.1.302 → v2.1.303 ○gone AND v2.1.305 tengu_calm_bear ◇ A feature that the server could switch on is now hard-coded off, so a server-side setting can no longer enable itv2.1.288 → v2.1.289 ○gone AND v2.1.290 tengu_calm_eagle ◇ Claude Code adds two server-controlled switches, a path for remote-session tools over MCP, and a new label for Claude.ai proxy serversnever mined ·never mined AND v2.1.290 tengu_calm_seal ◇ Claude Code can now sort a model into a family such as Fable, Haiku, Mythos, Opus or Sonnet, and names it only when a server-side list allows itv2.1.292 → v2.1.308 ◆in the build AND v2.1.292 tengu_carved_slate ◇ Claude Code now only re-sends changed CLAUDE.md/instruction files instead of the whole block each turn, saving tokens.v2.1.251 → v2.1.267 ○gone AND v2.1.265 tengu_ccr_bundle_seed_enabled ◇ If a folder is too big to seed a cloud session, you now see the size, cap and biggest files.v2.1.227 → v2.1.241 ○gone AND v2.1.273 tengu_ccr_context_build_after_resume_enabled ◇ The wake-up and retry steps for background MCP tasks now depend on a new remote switch that is off by defaultv2.1.275 → v2.1.284 ○gone AND v2.1.285 tengu_ccr_keepalive_after_stop_enabled ◇ Remote (CCR) sessions gain keepalive messages after a turn stops, currently off by defaultv2.1.277 → v2.1.280 ○gone AND v2.1.281 tengu_ccr_no_subscriber_flush_ms ◇ Subscriber-aware flush buffering is disabled by its default of zero.v2.1.248 → v2.1.308 ◆in the build AND v2.1.248 tengu_ccr_replay_acks_at_request_dispatch ◇ A server setting used for one cloud session type was only renamed internally and still falls back to offv2.1.280 → v2.1.300 ○gone AND v2.1.301 tengu_ccr_sse_keepalive_max_interval_s ◇ Realtime SSE connection now negotiates its keepalive timing with the server instead of using a fixed valuev2.1.271 → v2.1.308 ◆in the build AND v2.1.296 tengu_ccr_stream_event_flush_ms ◇ A remotely tuned batching interval is now range-checked so a bad value cannot break event flushing.v2.1.223 → v2.1.308 ◆in the build AND v2.1.223 tengu_ccr_stream_first_flush_ms ◇ CCR client can now delay the very first streamed event separately from later ones, via a new first-flush timing settingv2.1.273 → v2.1.308 ◆in the build AND v2.1.273 tengu_ccr_stream_flush_on_first_delta ◇ Remote sessions gain server-controlled options to send streamed output on its first piece and to acknowledge messages only once readv2.1.285 → v2.1.300 ○gone AND v2.1.301 tengu_cfc_in_product_permissions ◇ The in-product permissions path for Claude for Chrome is hard-disabled here.v2.1.152 → v2.1.250 ○gone AND v2.1.251 tengu_cheeky_toucan ◇ A switched-off change lets Claude Code recover kept messages from an earlier compaction marker when the usual one is missingnever mined ·never mined AND v2.1.301 tengu_chert_bezel ◇ Default false. When on, Claude Code adds the thinking-token-count-2026-05-13 beta header to API requests for models that support interleaved thinking, provided the API provider is first-party, anthropicAws or Foundry and experimental betas are not disabled (by CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS or a HIPAA restriction).v2.1.147 → v2.1.183 ○gone AND v2.1.185 tengu_cicada_nap_ms ◇ Claude Code changed how it decides on and runs the background loading it does when it startsv2.1.138 or earlier → v2.1.308 ◆in the build AND v2.1.290 tengu_cinder_plover ◇ The AskUserQuestion prompt now receives a lean-prompt flag that can suppress a guidance snippet.v2.1.152 → v2.1.308 ◆in the build AND v2.1.301 tengu_cinder_swift ◇ Closing the control stream while a question waits can now cancel the turn, but that path stays off.v2.1.223 → v2.1.308 ◆in the build AND v2.1.223 tengu_cinder_wren ◇ The instructions Claude gets for AskUserQuestion are now chosen based on which other tools are available in the sessionv2.1.216 → v2.1.308 ◆in the build AND v2.1.301 tengu_classifier_disabled_surfaces ◇ The spinner can show a short headline of what Claude is actually working on right now.v2.1.138 or earlier → v2.1.308 ◆in the build AND v2.1.227 tengu_classifier_summary_heuristic_emit ◇ Lightweight conversation summaries are now always generated instead of needing a flag.v2.1.138 or earlier → v2.1.224 ○gone AND v2.1.225 tengu_claudeai_plugins_sync_enabled ◇ Flags controlling claude.ai plugin and skill sync were renamed to claudeai-scoped namesnever mined ·never mined AND v2.1.283 tengu_claudeai_skills_sync_enabled ◇ Flags controlling claude.ai plugin and skill sync were renamed to claudeai-scoped namesnever mined ·never mined AND v2.1.277 tengu_claudeai_skills_sync_shared_round ◇ How often Claude Code resyncs skills from claude.ai is now set by the server, and sessions can optionally share a recent syncv2.1.282 → v2.1.308 ◆in the build AND v2.1.282 tengu_cloth_snorkel ◇ Artifact MCP enablement no longer falls back to a remote flag, defaulting on unless an env var overrides itv2.1.209 → v2.1.234 ○gone AND v2.1.235 tengu_cobalt_awning ◇ Remote sessions gain bookkeeping for the time of the last full sign-in check before model requests, off unless a server value is setv2.1.285 → v2.1.291 ○gone AND v2.1.285 tengu_cobalt_lantern ◇ Quick web setup stays off, now behind a named helper needing a flag and two entitlements.v2.1.138 or earlier → v2.1.247 ○gone AND v2.1.248 tengu_cobalt_plinth_bryony ◇ Claude Code now always tells the artifact system it supports five-class permission asks, instead of depending on a setting or remote switchv2.1.273 → v2.1.294 ○gone AND v2.1.295 tengu_cobalt_plinth_burnet ◇ Artifact comment and subscription operations can each be switched on separately from the server.v2.1.268 → v2.1.308 ◆in the build AND v2.1.251 tengu_cobalt_plinth_direct ◇ Artifact availability now hinges on one gate, and direct upload kicks in for create paths.v2.1.172 → v2.1.238 ○gone AND v2.1.239 tengu_cobalt_plinth_hazel ◇ Creating an artifact from a type inside a cloud session sits behind a second switch, off.v2.1.248 → v2.1.266 ○gone AND v2.1.242 tengu_cobalt_plinth_holly ◇ Artifacts gain full pin and unpin actions, wired end to end but off by default behind a gate with an env override.v2.1.259 → v2.1.284 ○gone AND v2.1.285 tengu_cobalt_plinth_larch ◇ You could start a private artifact from a published template, but two server switches keep it shut here.v2.1.236 → v2.1.308 ◆in the build AND v2.1.267 tengu_cobalt_plinth_linden ◇ An alternate way of serving artifact content exists but is unreachable in normal use.v2.1.251 → v2.1.308 ◆in the build AND v2.1.251 tengu_cobalt_plinth_madder ◇ Several artifact feature switches were renamed and re-gated, discarding any prior rollout.v2.1.242 → v2.1.308 ◆in the build AND v2.1.287 tengu_cobalt_plinth_orpine ◇ Built but off unless enabled remotely: a shortcut that answers some artifact edit requests with direct file edits instead of a model replyv2.1.288 → v2.1.308 ◆in the build AND v2.1.288 tengu_cobalt_plinth_putguard ◇ Default true. When on, an artifact publish upload PUT (the page or its thumbnail image) that returns a 2xx status without an x-goog-generation response header is treated as failed: it is reported as status 403 with the error upload intercepted: 2xx without x-goog-generation, on the assumption that a proxy answered instead of Google Cloud Storage. When off, any 2xx response counts as a successful upload.v2.1.193 → v2.1.238 ○gone AND v2.1.239 tengu_cobalt_plinth_quince ◇ Published Artifacts get per-block anchor ids so links can point at a specific block.v2.1.236 → v2.1.238 ○gone AND v2.1.239 tengu_cobalt_plinth_reader_persist ◇ A prompt-and-context experiment switch was renamed and four other switches disappeared entirely.v2.1.191 → v2.1.245 ○gone AND v2.1.246 tengu_cobalt_plinth_rowan ◇ Claude could browse published artifact types to start from, but both actions are switched off.v2.1.248 → v2.1.266 ○gone AND v2.1.242 tengu_cobalt_plinth_sloe ◇ The Artifact tool's instructions now come in versions v0, v1 and v2, picked once per session by an env var, the session origin or a flagv2.1.281 → v2.1.295 ○gone AND v2.1.281 tengu_cobalt_thistle ◇ Artifact syntax highlighting and mermaid diagrams are now always on; three other gates were renamed and stay off.v2.1.211 → v2.1.238 ○gone AND v2.1.239 tengu_concurrent_candle ◇ A new gated 'start kit' feature can auto-bundle an artifact type, design system, and REPL toolv2.1.274 → v2.1.303 ○gone AND v2.1.274 tengu_copper_fox ◇ Forked subagents are on by default in interactive sessions; set CLAUDE_CODE_FORK_SUBAGENT to false to opt out.v2.1.138 or earlier → v2.1.231 ○gone AND v2.1.232 tengu_copper_kite ◇ With no API key, Claude Code can now fall back to a bearer token from the environment when fetching policy limits and remote settingsnever mined ·never mined AND v2.1.285 tengu_cozy_pixel ◇ A new fork_conversation control request lets a host app branch a session's history into a brand-new sessionv2.1.268 → v2.1.276 ○gone AND v2.1.277 tengu_cozy_teapot ◇ A remotely gated A/B test can loosen the bash-first system prompt wording.v2.1.271 → v2.1.306 ○gone AND v2.1.307 tengu_curious_river ◇ In Anthropic cloud sessions, a running MCP task stops keeping its cloud container up after a set number of hours, 168 by defaultv2.1.305 → v2.1.308 ◆in the build AND v2.1.305 tengu_curious_tower_stateless_models ◇ New gated 'tether' system can thread API requests together server-side instead of resending full context each turnv2.1.265 → v2.1.308 ◆in the build AND v2.1.265 tengu_dapper_lagoon ◇ An environment variable overrides whether something counts as first-party.v2.1.251 → v2.1.276 ○gone AND v2.1.251 tengu_dapper_truffle ◇ Auto mode's check of allowed MCP write tools now accepts rules from a command and adds a server-side decision path that is off by defaultv2.1.299 → v2.1.308 ◆in the build AND v2.1.299 tengu_dazzling_floyd ◇ You can type /review instead of /code-review, and pass a PR number as the target.v2.1.223 → v2.1.241 ○gone AND v2.1.246 tengu_deep_starlight ◇ Whole-PDF reads can skip a page-image render that only fed telemetry, and PDF renders can now be cancelledv2.1.281 → v2.1.306 ○gone AND v2.1.307 tengu_delegated_quail ◇ A background model-catalog comparison check now always has network access, though the feature stays off by defaultv2.1.251 → v2.1.308 ◆in the build AND v2.1.283 tengu_disable_bypass_permissions_mode ◇ Default false. When on, it disables bypassPermissions mode the same way the setting permissions.disableBypassPermissionsMode: "disable" does: startup mode selection skips bypassPermissions with the notice Bypass permissions mode was disabled by your organization policy, and the permission context marks bypass mode unavailable. A session already in bypass mode is also checked asynchronously against this gate; in the interactive UI it is switched to default mode, and on the other startup path Claude Code logs a warning and shuts down with exit code 1 and reason bypass_permissions_disabled.v2.1.138 or earlier → v2.1.233 ○gone AND v2.1.234 tengu_drifting_reef ◇ A new switch, off by default, makes computer-use actions in auto mode go through further permission checks even when an allow rule covers the whole toolv2.1.284 → v2.1.308 ◆in the build AND v2.1.284 tengu_enchanted_willow ◇ Mid-turn cost and token updates for print and SDK sessions now only run if a server-provided interval is set; with none, they are skippedv2.1.291 → v2.1.294 ○gone AND v2.1.291 tengu_fancy_crab ◇ Account memory tool inputs and results can be replaced with a placeholder, and remote sessions now fetch memory at the start and end of a turnv2.1.285 → v2.1.308 ◆in the build AND v2.1.285 tengu_feedback_survey_config ◇ The feedback survey checks for itself whether you're mid-prompt, so it interrupts you less.v2.1.162 → v2.1.308 ◆in the build AND v2.1.247 tengu_fennel_godwit ◇ On Opus 5, Claude is told not to spawn subagents, workflows or deep research unless you ask.v2.1.219 → v2.1.301 ○gone AND v2.1.219 tengu_fizzy_minsky ◇ In the desktop app and on claude.ai, a browser request with no extension connected can get a fixed setup reply instead of a model answerv2.1.300 ○gone AND v2.1.301 tengu_fleetview_simple ◇ The rule for turning on fleet view's simple mode is unchanged, but the way that code looks up keyboard shortcuts changedv2.1.216 → v2.1.308 ◆in the build AND v2.1.299 tengu_flint_harbor_prompt ◇ Default {}. Overrides for the /team-onboarding command: a string prompt replaces the built-in prompt template, a string guideTemplate replaces the text inserted at {{GUIDE_TEMPLATE}}, and a number windowDays sets how many days of usage data are scanned, floored and clamped to 1 through 365 (default 30). Fields of the wrong type use the built-in values.v2.1.138 or earlier → v2.1.308 ◆in the build AND v2.1.248 tengu_foamy_sedgewick ◇ A new instruction tells Claude to treat downloads and unpacked archives as untrusted and keep them apart from its own scriptsnever mined ·never mined AND v2.1.290 tengu_frame_publish_context ◇ Frame publish context is now permanently off and no server setting can enable it.v2.1.196 → v2.1.247 ○gone AND v2.1.248 tengu_gault_kestrel ◇ Default false. When on, the system prompt's guidance on hard-to-reverse actions ends its "Before deleting or overwriting, look at the target" sentence there, dropping the follow-on "If what you find contradicts how it was described, or you didn't create it, surface that instead of proceeding". The shorter wording is also used when CLAUDE_CODE_GAULT_KESTREL is set, when the Opus 5 prompt bundle applies (unless tengu_fennel_godwit is on), or when the client data key of this name is true.v2.1.257 → v2.1.259 ○gone AND v2.1.215 tengu_gb_eval_authed_enable ◇ Feature-flag requests can now attach auth asynchronously, but that path stays off in this build.v2.1.212 → v2.1.226 ○gone AND v2.1.227