[Bug] Artifact tool missing from all surfaces for single Team account since 2026-07-28

Bug Description
Title: [BUG] Artifact tool absent from all surfaces for a single Team-plan account (CLI + claude.ai web + New artifact) since ~2026-07-28; org unaffected ## Summary The Artifact tool is not registered in any session for my account, across every surface: Claude Code CLI, claude.ai web chat, and the claude.ai/artifacts "New artifact" entry point. Claude falls back to writing a local HTML file. On web it presents the HTML file as an artifact ("an artifact just is a file written to the outputs directory"), which appears to be confabulation when the tool is unavailable — nothing is created and nothing appears in my gallery. Artifacts worked on this account for weeks and stopped ~28 July 2026. My organization is unaffected: coworkers on the same Team org published artifacts on 7 and 10 August 2026. ## Onset — pinned independently by two signals - skillUsage["artifact-design"] in ~/.claude.json: usageCount: 13, lastUsedAt: 1785265172528 (2026-07-28). Nothing since. - claude.ai/artifacts gallery: prior artifacts still listed and viewable, all "Edited 2 weeks ago" as of 2026-08-11. ## Requirements verified | Requirement | Status | | --- | --- | | Plan | Team — artifacts on by default; Enterprise RBAC role scoping N/A | | Org capability | Artifacts toggle on; coworkers published 2026-08-07 and 2026-08-10 | | CLI version | 2.1.226 (min 2.1.183) | | Auth | /login claude.ai Team session; ANTHROPIC_API_KEY and ANTHROPIC_AUTH_TOKEN unset | | Model provider | Anthropic API (reproduces on Opus 4.8 and Opus 5) | | Local settings | No disableArtifact; no Artifact in permissions.deny (user + local); CLAUDE_CODE_DISABLE_ARTIFACT and CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC unset | | Managed policy | /Library/Application Support/ClaudeCode/managed-settings.json does not exist | | Org policy | ZDR/CMEK/HIPAA not available on Team | ## Also ruled out - Adding "Artifact" to permissions.allow — no effect - Child vs top-level session (CLAUDE_CODE_CHILD_SESSION set vs unset) — reproduces in both - /login re-auth — cached feature-flag values unchanged afterward - claude --debug — logs no gating decision for artifacts ## Possibly relevant Cached GrowthBook values in ~/.claude.json: tengu_plan_artifact, tengu_md_artifact_styling, and tengu_retire_chat_relay_artifact_backstop are all false; tengu_frame_publish_context is true. Noting these for completeness — false is the default for most flags there, and no tengu_*artifact*_tool flag exists, so these may be incidental. Reproduces the diagnostic from #80418: built-in agent-type definitions still list Artifact in their tool-exclusion lists ("All tools except Agent, Artifact, ExitPlanMode, ...") while the tool is absent from the session registry — the client ships the concept but never receives the grant. ## Relation to #80418 Same symptom, different scope. #80418 is org-wide, CLI-only (claude.ai web unaffected), onset ~16 July. Mine is single-account, all-surface (web included), onset ~28 July, in an otherwise healthy org. Filing separately since the org-scope diagnosis there does not fit. ## Expected vs actual - Expected: Artifact tool available; artifacts publish to claude.ai. - Actual: tool absent from every surface for this account; local HTML file written instead.

Environment Info

• Platform: darwin
• Terminal: vscode
• Version: 2.1.226
• Feedback ID: 5604ea08-b2e0-4be4-a0fc-aea4a3af702a

Errors

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