Artifact types (template-backed starters with a type_url parameter) are built end to end but sit behind two server flags that default off.
A new publish mode lets Claude start a private artifact on claude.ai from a published "Artifact type", a template whose page and settings are fixed by its publisher: pass type_url and your own files land alongside the type's. It is held shut by two independently gated server flags, both defaulting off, plus a local-only check, so nothing here is reachable in this build without server config. Reading and publishing into an artifact that already came from a type are unaffected by these gates; only creation from a type is suppressed.
- Creation needs both
tengu_cobalt_plinth_larch(or the environment variableCLAUDE_CODE_ARTIFACT_TYPES) andtengu_cobalt_plinth_bracken; all three names are new in this build. - Both flags are resolved once when the tool schema is built and frozen for the session, so they cannot change mid-session. With them off,
type_urlis not in the schema at all and the tool refuses with a message that artifact types are not enabled in this session. - The create capability is computed as types-on AND the environment variable
CLAUDE_CODE_REMOTEnot being set, so a remote or web session never seestype_urleven with both flags on. - Creation posts to
/api/frame/types/<slug>/createwith one retry that honours retry-after on 409 and 429; failures include recovery text for the case where the artifact was created but the file publish failed. type_urlcannot be combined withurl,pr_review,capabilities,contract,langorforce, and creating twice from the same type in one session is refused.- Results distinguish your own files from the type's files, and the type's page is injected as untrusted content inside its own wrapper.
- Plan mode and Cowork frames, the shared-workspace surface, each have their own deny paths, and new analytics record the create with counts of own files and type files.
Create a new private Artifact on claude.ai from an existing Artifact type, created_from_type, tengu_cobalt_plinth_larch, a publish with \type_url\ always creates a new Artifact whose page and settings come from the type \u2014 remove \url\, \pr_review\, \capabilities\, \contract\, \lang\, and \force\`, tengu_cobalt_plinth_bracken, Artifact types: To start a new Artifact from a published Artifact type (people may call one a template or a starter), pass \type_url\ (the type's link), typeLocked: n.data.type != null && typeof n.data.type === "object", type_locked, Artifact types are not enabled in this session, creating an Artifact from an Artifact type (\type_url\) is not available in this session — remove \type_url\, CLAUDE_CODE_ARTIFACT_TYPES, CLAUDE_CODE_REMOTE`
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
tengu_cobalt_plinth_larch Off in both readingsThe flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.
This account: off · anonymous baseline: off · compiled default in v2.1.236: off
tengu_cobalt_plinth_bracken Off in both readingsThe flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.
This account: off · anonymous baseline: off · compiled default in v2.1.236: off
Read once, for one account on one subscription tier, against v2.1.236. It isn't a statement about your account. What a flag value here can and cannot tell you
A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
New in this build: CLAUDE_CODE_ARTIFACT_TYPES