How to get a Claude Code plan as one HTML page with the html-plan plugin

Thariq Shihipar (@trq212) from the Claude Code team published html-plan, a plugin that writes an implementation plan as a single HTML page, to Anthropic's community marketplace. It uses plain language, shows code snippets and mockups, and pulls out the questions you need to decide.

Add the marketplace and install it.

claude plugin marketplace add anthropics/claude-plugins-community
claude plugin install html-plan@claude-community

Call it with what you want to build.

/html-plan add send later to the composer

The plan is a tree of claims. The top is a name and the why. Level 1 shows what someone can now do (a mockup or a state machine), level 2 how it works (a call stack, schema or snippet), level 3 where in the code. Collapsed, the tree is the summary. Each decision is numbered: pick options or comment on any line, press Respond, and paste the single answer back to Claude.

It needs node to pack the page into one file and nothing else. The author says he wants feedback before shipping it more broadly.