Feature flags, all 2,081.

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_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_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_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_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_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_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_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_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_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_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_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_dapper_lagoon ◇ An environment variable overrides whether something counts as first-party.v2.1.251 → v2.1.276 ○gone AND v2.1.251 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_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_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_gentle_frost ◇ A new SuggestPluginInstall tool renders an inline card offering to install a plugin found by searchv2.1.280 → v2.1.303 ○gone AND v2.1.280 tengu_gentle_grove ◇ Claude Code adds two new switches the server can turn on or off, one of them on unless switched off remotelynever mined ·never mined AND v2.1.304 tengu_gorse_plover ◇ New internal flags added, including bashActFirstEnabled and three codename gates amber_astrolabe, bison_cairn, larch_cisternv2.1.248 → v2.1.287 ○gone AND v2.1.275 tengu_heron_tallow ◇ Default false. Changes the hint added when the model calls a tool that is not available: for a known tool it reads <tool> is disabled for this session, in subagents as well as here. instead of exists but is not enabled in this context, and for Glob or Grep when Bash is also unavailable it reads <tool> is disabled for this session. CLAUDE_CODE_HERON_TALLOW turns on the same wording.v2.1.217 → v2.1.228 ○gone AND v2.1.217 tengu_herring_clock ◇ Default false. When auto memory is enabled, turns on team memory: a team directory inside the auto-memory directory is loaded into the memory prompt next to the personal one, the team scope can be synced at startup, and writes to it are scanned for secrets (cannot be written to team memory). A non-empty CLAUDE_MEMORY_STORES turns team memory on as well.v2.1.138 or earlier → v2.1.209 ○gone AND v2.1.210 tengu_iridescent_pascal ◇ New gated flag tengu_iridescent_pascal can skip redundant permission-context resetsv2.1.280 → v2.1.291 ○gone AND v2.1.292 tengu_jazzy_goblet ◇ Changing the automatic model-fallback-on-refusal setting now fires its own telemetry event and saves via userSettingsv2.1.269 → v2.1.308 ◆in the build AND v2.1.269 tengu_lilac_dune ◇ A new 'summary' hint for thinking blocks exists in the code but is gated off for nowv2.1.269 → v2.1.281 ○gone AND v2.1.282 tengu_lively_beaver ◇ A full account-on-hold sign-in flow was added but stays unreachable pending a server-side gatev2.1.248 → v2.1.301 ○gone AND v2.1.235 tengu_lovely_umbrella ◇ Policy-limits change notifications can now be skipped under an experiment flagnever mined ·never mined AND v2.1.281 tengu_magical_pixel_startup ◇ The macOS iOS-app intent check now always reads the tengu_magical_pixel gate, and tengu_magical_pixel_startup is no longer usedv2.1.278 ○gone AND v2.1.281 tengu_marl_cormorant ◇ Default false. When on, the Bash tool description gains the line Command output is displayed to you, not reliably to the user. The line is also added when CLAUDE_CODE_MARL_CORMORANT is set to a true value, when the cached client data has tengu_marl_cormorant: true, or when the model has the opus_5_prompt_bundle capability and tengu_fennel_godwit is off.never mined ·never mined AND v2.1.215 tengu_mcp_memory_cgroup ◇ On Linux you can force MCP servers into their own memory cgroup with an environment variable.v2.1.239 → v2.1.245 ○gone AND v2.1.246 tengu_ochre_hollow ◇ Artifact syntax highlighting and mermaid diagrams are now always on; three other gates were renamed and stay off.v2.1.138 or earlier → v2.1.238 ○gone AND v2.1.239 tengu_ochre_kite ◇ Claude Code now recovers gracefully when a safety filter cuts off a response mid-tool-callv2.1.273 → v2.1.281 ○gone AND v2.1.282 tengu_parchment_fern ◇ An alternate prompt wording for two tools exists but stays off unless you set an environment variable.v2.1.248 → v2.1.283 ○gone AND v2.1.223 tengu_quizzical_shore ◇ A hidden hint can appear on thinking blocks per model, off by default.v2.1.260 → v2.1.281 ○gone AND v2.1.282 tengu_radiant_fox ◇ 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 showsnever mined ·never mined AND v2.1.302 tengu_reactive_zephyr ◇ In served sessions, Claude can no longer edit settings files, and permission prompts for network paths are never approved automaticallynever mined ·never mined AND v2.1.288 tengu_review_workflow_routing ◇ Two server-side switches that steered review behaviour are gone, so reviews no longer vary by remote config.v2.1.160 → v2.1.231 ○gone AND v2.1.232 tengu_scalable_quiche ◇ Artifacts could keep being watched even when your session is not running, but that is off.v2.1.227 → v2.1.238 ○gone AND v2.1.239 tengu_snug_platypus ◇ 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_sorrel_avocet ◇ Claude could start deep research on its own instead of waiting for you to ask, if enabled.v2.1.219 → v2.1.308 ◆in the build AND v2.1.281 tengu_sorrel_trellis_newel ◇ Artifact-comment auto-reply gains a fork/handoff path behind the tengu_sorrel_trellis_newel gatev2.1.268 → v2.1.308 ◆in the build AND v2.1.269 tengu_sorted_flute ◇ A new internal check can now silently skip saving flag settings changes to diskv2.1.280 → v2.1.285 ○gone AND v2.1.286 tengu_steady_marshmallow ◇ Identity changes mid-session can now defer a policy reload instead of immediately reloading as an account changenever mined ·never mined AND v2.1.274 tengu_steady_sunbeam ◇ 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_stone_shell ◇ Rewritten memory rules would make Claude save corrections and environment quirks immediately, before replying.v2.1.212 → v2.1.285 ○gone AND v2.1.286 tengu_tab_read_sep ◇ The tab-aware read separator flag is read fresh each time but still off.v2.1.138 or earlier → v2.1.308 ◆in the build AND v2.1.248 tengu_teleport_send_to_cloud ◇ A menu to send your session to the cloud exists but stays hidden unless the server enables it.v2.1.229 → v2.1.308 ◆in the build AND v2.1.247 tengu_tidy_axolotl ◇ Claude Code reads a server-controlled switch whose built-in value is on; what it controls is not knownv2.1.292 → v2.1.299 ○gone AND v2.1.300 tengu_tool_memory_cgroup ◇ On Linux you can cap memory for shell commands so a runaway process cannot eat your machine.v2.1.233 → v2.1.245 ○gone AND v2.1.295 tengu_tranquil_crescent ◇ Claude Code adds three new internal feature gates: typed_koala, zinc_harbor, tranquil_crescentnever mined ·never mined AND v2.1.275 tengu_twinkly_prism ◇ Two server switches, off unless turned on remotely, can hide or skip MCP servers from claude.ai-synced plugins that a terminal cannot sign in tov2.1.283 → v2.1.308 ◆in the build AND v2.1.283 tengu_umber_kestrel ◇ Gates the EndConversation tool, which lets Claude end a conversation after sustained abuse and an earlier warning. Code default false; true enables it for the cli entrypoint, and an object {scope: "<regex>"} enables it for entrypoints that fully match the regex (case-insensitive, falling back to cli if the regex is invalid). It also applies only to a fixed list of model families and versions.v2.1.206 → v2.1.308 ◆in the build AND v2.1.206 tengu_velvet_mallet ◇ An alternate prompt wording for two tools exists but stays off unless you set an environment variable.v2.1.166 → v2.1.195 ○gone AND v2.1.228 tengu_violin_duet ◇ Claude Code gains switches for a connected mode for cloud sessions and a file sync that depends on it, both off unless turned on remotelynever mined ·never mined AND v2.1.284 tengu_webagent_mcp_bridge ◇ The hearthbot chat bridge can now auto-allow many more read-only actions without a permission promptv2.1.273 → v2.1.274 ○gone AND v2.1.273 tengu_willow_tern ◇ A writing-style prompt block can be forced on with an environment variable; otherwise it stays off.v2.1.248 → v2.1.294 ○gone AND v2.1.247 tengu_windows_credman ◇ Several internal services now receive login credentials directly instead of grabbing whatever token is lying around.never mined ·never mined AND v2.1.269 tengu_woven_harbor ◇ Cloud sessions from review or plan sources can use a newer creation endpoint allowing --project grouping.v2.1.227 → v2.1.241 ○gone AND v2.1.224