list_types and describe_type are implemented behind CLAUDE_CODE_ARTIFACT_TYPE_CATALOG and a flag that defaults false.
Two read-only actions are added to the Artifact tool: list_types takes a type_query and returns published types this account could start a new Artifact from (title, url, description, tier), and describe_type takes a type_url and returns that type's files, instructions file, capabilities and whether it is creatable. Both are switched off here. Availability is read from CLAUDE_CODE_ARTIFACT_TYPE_CATALOG, falling back to the flag tengu_cobalt_plinth_rowan, whose built-in value is false, and neither exists in the previous build.
- The value is computed once when the tool's schema is built and frozen for the session, and the wider artifact-types feature must also be on.
- With it off, the actions do not appear in the tool's action list, the paragraph of the prompt that advertises them is omitted, and calls answer with an unavailable message or "artifact types not available to this account".
- Permission text warns that titles and descriptions in these listings are written by their publishers and are read into the conversation.
- Results render as "listed N artifact types" and "described artifact type ... (N files ... ships instructions)", and a not-found reply points you at using a
type_urlfromlist_types.
describing an Artifact type is not available in this session, artifact types not available to this account, if (i) c.push("list_types", "describe_type");, list published artifact types (read-only; titles and descriptions written by their publishers)
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
tengu_cobalt_plinth_rowan 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 v2.1.242: not a boolean we can read
Read once, for one account on one subscription tier, against v2.1.242. 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.
New in this build: CLAUDE_CODE_ARTIFACT_TYPE_CATALOG