Every feature flag, and where it lived
158 of 2,081 feature flags One tick per build on this box, oldest on the left. A gap is a build the feature flag was not in.
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Compiled default
A is the one account this site reads, N the anonymous baseline, D what the release compiled in. 1,143 of 2,081 gates have been read at all: a run only records the gates its own release wrote about. Claude Code evaluates its gates on Anthropic's servers, so a reading of off can be a rollout this account sits outside of, and none of it says anything about your install. How to read these.
○ not in v2.1.308, ◇ we found no documentation describing it.
Feature flagWhat it doesSpan v2.1.138 → v2.1.308 Status Reading
tengu_noble_snowflake ◇ A new telemetry event, tengu_bridge_transcript_deferral, reports each stage of Remote Control's deferred transcript uploadv2.1.281 → v2.1.308 ◆in the build AND v2.1.281
tengu_org_policy_denied ◇ Blocked remote-session actions from org policy now emit a tengu_org_policy_denied telemetry eventnever mined ·never mined AND v2.1.296
tengu_parsed_eagle ◇ Claude Code can re-encode images as WebP when that is smaller, and now refuses images that are too costly to decodev2.1.295 → v2.1.308 ◆in the build AND v2.1.295
tengu_penguins_off ◇ Fast mode ('penguin mode') gains an admin setting to require per-session opt-in or disable it, plus an org-check bypass env varv2.1.138 or earlier → v2.1.308 ◆in the build AND v2.1.299
tengu_pewter_kite_ms ◇ A background query could narrate what Claude is doing under the spinner, off unless enabled.v2.1.234 → v2.1.283 ○gone AND v2.1.234
tengu_pewter_lintel ◇ Several keypresses arriving at once can now be drawn one by one without setting CLAUDE_CODE_COMMIT_BETWEEN_KEYSv2.1.283 ○gone AND v2.1.284
tengu_plugin_autoupdate_allow_credential_helper ◇ Plugin autoupdate now always disables the git credential helper during background refreshv2.1.174 → v2.1.278 ○gone AND v2.1.280
tengu_precious_koala ◇ Claude Code has a new remotely controlled switch, off by default, that can turn on an unnamed feature everywhere or only in Coworkv2.1.299 → v2.1.308 ◆in the build AND v2.1.299
tengu_projects_thread_recap_prompt ◇ A richer "recap" format for project task status is being built, gated off by defaultv2.1.265 → v2.1.308 ◆in the build AND v2.1.265
tengu_prompt_cache_1h_config ◇ Whether a one-hour prompt cache is allowed can now be overridden per agent and can ignore overage.v2.1.138 or earlier → v2.1.308 ◆in the build AND v2.1.293
tengu_propose_skills ◇ An env var turns on the tool that proposes new skills; otherwise it stays off in this build.v2.1.212 → v2.1.250 ○gone AND v2.1.251
tengu_quirky_kazoo ◇ A list Claude Code fetches from its remote configuration is now read under a different name, so values set under the old name no longer applynever mined ·never mined AND v2.1.292
tengu_quirky_shore ◇ 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_rc_long_turn_nudge ◇ The long-turn nudge feature no longer accepts a simple on/off setting; it now requires a full config objectv2.1.208 → v2.1.308 ◆in the build AND v2.1.280
tengu_repl_mcp_error_throw ◇ The gate behind MCP error-throwing now reads under the name tengu_tranquil_fern instead of tengu_repl_mcp_error_throwv2.1.217 → v2.1.274 ○gone AND v2.1.275
tengu_rosy_pine ◇ A prompt can offer to continue a resumed old session on a newer model of the same family; it is off unless switched on remotelyv2.1.286 ○gone AND v2.1.286
tengu_rustling_pixel ◇ Claude Code can now keep extended-thinking content across any model switch, not just upgradesv2.1.280 → v2.1.308 ◆in the build AND v2.1.280
tengu_saffron_credits_only_tiers ◇ No description from anybody.v2.1.190 → v2.1.308 ◆in the build AND v2.1.190
tengu_saffron_lattice ◇ Whether a model needs consent or usage credits can now be decided per model rather than for the whole planv2.1.170 → v2.1.308 ◆in the build AND v2.1.299
tengu_sage_compass2 ◇ An internal advisor model concept exists, with sub-agents told never to consult it, and only runs under first-party auth plus a flag.v2.1.138 or earlier → v2.1.308 ◆in the build AND v2.1.282
tengu_sedge_lantern ◇ /recap and the Session recap settings entry now work for everyone without an experiment flag.v2.1.138 or earlier → v2.1.222 ○gone AND v2.1.223
tengu_serialized_petal ◇ A new setting controlled from Anthropic's servers is a number that is 0 unless the server sets it and two conditions are metv2.1.302 → v2.1.308 ◆in the build AND v2.1.302
tengu_silent_heron ◇ When a background shell command produces no new output for a while, Claude is sent a check-in note, if a server sets the waiting timev2.1.290 → v2.1.308 ◆in the build AND v2.1.290
tengu_slate_harrier ◇ Claude no longer spends up to a minute investigating before asking you a clarifying question.v2.1.138 or earlier → v2.1.222 ○gone AND v2.1.223
tengu_sleepy_shore ◇ The web search tool has a built-in choice between a quick, cheap search and a slower, thorough one, but it stays off unless configuredv2.1.282 → v2.1.308 ◆in the build AND v2.1.283
tengu_sleepy_snowflake ◇ New 'sleepy_snowflake' setting controls how widely kept reminders are delivered, per model and conversationv2.1.271 → v2.1.308 ◆in the build AND v2.1.282
tengu_snug_reef ◇ MCP servers that failed with a retryable error can be retried automatically at the start of each turn, for a limited number of turnsv2.1.295 → v2.1.308 ◆in the build AND v2.1.295
tengu_snug_storm ◇ A notice for Max and Team plans about an API credit link is built in, with its wording supplied remotely and a limit on how often it showsv2.1.302 → v2.1.308 ◆in the build AND v2.1.302
tengu_soft_slate_nudge ◇ Default "baseline". Setting it to "off" stops the periodic todo and task reminders that are otherwise attached after 10 assistant turns without a todo or task update and 10 turns since the last reminder; any other value keeps them. CLAUDE_CODE_TODO_REMINDER_MODE overrides it.v2.1.178 → v2.1.308 ◆in the build AND v2.1.178
tengu_squishy_newt ◇ Messages relayed from a project's coordinator session are handled by a switch that defaults to on, and the model is told when one is waitingv2.1.282 → v2.1.300 ○gone AND v2.1.301
tengu_startup_announcements ◇ Default []. A list of startup announcements, each with id, text, optional title, footer and requiresModel, priority (default 0), maxImpressions (default 3) and accentBar (default true). Claude Code picks the highest-priority entry that has been shown fewer than maxImpressions times and whose requiresModel, if set, passes a model check; a value that fails the schema falls back to [].never mined ·never mined AND v2.1.187
tengu_structured_creek ◇ In auto mode, tool calls that Claude Code generates itself now skip the classifier and are allowedv2.1.281 → v2.1.284 ○gone AND v2.1.285
tengu_sunny_locket ◇ A remotely controlled option can compact a long, idle conversation shortly before its one-hour prompt cache runs outv2.1.283 → v2.1.306 ○gone AND v2.1.307
tengu_sunset_penguin_opus46 ◇ Default "2026-06-29". Date (parsed with Date.parse) on which Opus 4.6 fast mode is removed: when fast mode is turned on while the current model is claude-opus-4-6 and the date is still in the future, Claude Code shows the warning Opus 4.6 fast mode is deprecated and will be removed on <date>, with the date formatted like Jun 29 in UTC. An unparseable or past date shows no warning.v2.1.174 → v2.1.191 ○gone AND v2.1.174
tengu_sunset_penguin_opus47 ◇ Default "2026-07-25". Removal date for Opus 4.7 fast mode: when fast mode is turned on (via /fast or the picker) while the current model is claude-opus-4-7 and the date is still in the future, a warning notice Opus 4.7 fast mode is deprecated and will be removed on <date> appears, with the date shown like Jul 25 in UTC. An unparseable or past date shows no notice.v2.1.196 → v2.1.220 ○gone AND v2.1.196
tengu_surface_failed_mcp_servers ◇ MCP servers that fail to connect are now reported to you by default.v2.1.205 → v2.1.308 ◆in the build AND v2.1.247
tengu_swift_lynx ◇ A hidden new tool lets Claude open the page for a startup promotional offerv2.1.275 → v2.1.308 ◆in the build AND v2.1.296
tengu_synthetic_fog ◇ When a remote tool answer is too big, Claude Code now shrinks embedded images to fit before refusing, and the size limit can be set remotelyv2.1.284 → v2.1.308 ◆in the build AND v2.1.284
tengu_tallow_quoit ◇ Team and Enterprise members who hit their own spend limit in VS Code can get a 'Request more' button that notifies their organization's adminsv2.1.307 → v2.1.308 ◆in the build AND v2.1.307
tengu_tender_truffle ◇ A check that matched MCP servers against a remote list can now read a single on/off switch instead, depending on how it is callednever mined ·never mined AND v2.1.300
tengu_thistle_grebe ◇ Subagent nudging behaviour can be picked per model, but the whole feature stays behind a gate.never mined ·never mined AND v2.1.227
tengu_tidy_lemon ◇ A remotely controlled option lets team members send a more-usage request to their admin directly from /rate-limit-optionsv2.1.283 → v2.1.308 ◆in the build AND v2.1.283
tengu_tingly_pike ◇ How Claude Code prompts the model to continue after hitting its output limit, and when it gives up, can now be set by a server switchv2.1.305 → v2.1.308 ◆in the build AND v2.1.305
tengu_tool_cgroup_exclude_classes ◇ Memory limits now reach npm, git, tmux, LSP, MCP and hooks, but everything except Bash is excluded.never mined ·never mined AND v2.1.246
tengu_twinkling_swan ◇ Workflow pauses for usage limits gain a check on whether they would wait, plus a new remotely set number with a capv2.1.288 → v2.1.295 ○gone AND v2.1.288
tengu_ultrareview_awareness ◇ A startup tip suggests cloud branch review and shows how many free reviews you have left.v2.1.224 → v2.1.303 ○gone AND v2.1.224
tengu_vellum_ash ◇ Default []. A list of model name fragments: when the current main model's name contains any non-empty entry, TodoWrite and the task tools (TaskCreate, TaskGet, TaskUpdate, TaskList) are disabled and the todo and task reminder messages are not added. A non-array or empty value changes nothing.v2.1.202 → v2.1.232 ○gone AND v2.1.233
tengu_velvet_cascade ◇ Which models get the simple system prompt is now decided locally, not by remote config.v2.1.138 or earlier → v2.1.226 ○gone AND v2.1.227
tengu_velvet_falcon_model ◇ Default "". A model name substring: when CLAUDE_CODE_VELVET_FALCON is unset and the cached client data has no non-empty string velvet_falcon_model, any model whose normalized name contains this non-empty value is treated as the falcon class, alongside claude-fable-5 and claude-mythos-5. An empty value adds no models.v2.1.163 → v2.1.173 ○gone AND v2.1.163
tengu_velvet_ibis ◇ MAX_MCP_OUTPUT_TOKENS is still honoured first, but it's no longer sanity-checked as a number.v2.1.138 or earlier → v2.1.308 ◆in the build AND v2.1.248
tengu_version_config ◇ Startup version-check logic was refactored into its own function, no behavior changenever mined ·never mined AND v2.1.290
tengu_violin_spruce ◇ Remote callers using this machine's tools can get a report of its CPU, memory, disk and installed CLI tools, and can run background Bash commandsv2.1.287 → v2.1.308 ◆in the build AND v2.1.287
tengu_walnut_gable ◇ Publishing an artifact now strips all nested preview wrappers, not just the outermost one.v2.1.234 → v2.1.238 ○gone AND v2.1.239
tengu_wise_bear_copy ◇ Usage-limit reset messages now map limit types to session, weekly, or model-based reset scopesv2.1.280 → v2.1.308 ◆in the build AND v2.1.280
tengu_wondrous_acorn ◇ A new tether subsystem recreates a thinking thread when the server drops earlier thinking due to a prefix mismatchv2.1.280 → v2.1.308 ◆in the build AND v2.1.280
tengu_woolly_parsnip ◇ Auto mode now stops itself instead of looping forever when safety checks keep failingv2.1.280 → v2.1.284 ○gone AND v2.1.285
tengu_zany_flask ◇ Attachment uploads now have separate remote settings for preview and scaled copies, and Claude is told when an image went out scaled downv2.1.287 → v2.1.308 ◆in the build AND v2.1.292
tengu_zany_pike ◇ After over 65 minutes idle, Claude Code can ask to clear older tool results from the conversation, keeping the last 5; off by defaultnever mined ·never mined AND v2.1.284
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