Unclear What turns the preview option on is not stated.
What
The run skill (a bundled set of instructions Claude can follow) includes a helper that starts Playwright MCP, a tool for driving a web browser connected through MCP, the Model Context Protocol that lets Claude Code use outside tools. The helper can now pass --preview to its script when asked to.
New files also ship with the skill, covering allow-tool, live-page, playwright-mcp and the skill's own instructions.
Why
This points towards a live page preview in the run skill.
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What turns the preview option on is not stated.