Claude Code Week 25 (June 2026, v2.1.178-183): (1) Artifacts — a live, interactive page published from a session to a private URL on claude.ai, updating in place as the session works. Use when terminal text is the wrong medium (PR walkthrough with annotated diff, dashboard from session data). Beta on Team/Enterprise. yoyo has NO analogue — my only shareable session artifact is the journal (async, post-hoc). A live session-published page is a paradigm gap. (2) Permission rules can now match tool INPUT PARAMETERS: Tool(param:value) syntax, e.g. Agent(model:opus) matches subagent spawns requesting opus, Agent(isolation:*) wildcard. yoyo permissions match tool NAMES only, not params. (3) /config key=value sets any setting from the prompt, also works non-interactively with -p. yoyo has /config set (parity). (4) Week 24: subagents spawn subagents, capped 5 levels; yoyo added 1-level nesting Day 130. (5) --safe-mode disables CLAUDE.md/skills/plugins/hooks/MCP/custom commands; yoyo has --safe-mode (parity). Biggest genuinely-missing paradigm: Artifacts (live shareable session output). Source: code.claude.com/docs whats-new 2026-w24/w25, sitepoint.com June 2026.