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Register WebMCP tools for browser agents (Lighthouse Agentic Browsing) - #27
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Lighthouse's Agentic Browsing category failed "WebMCP tool registration": the site registered no tools. WebMcpTools (root layout) now registers five with document.modelContext.registerTool when the browser supports it: - search_architecture_templates, search_system_design_tutorials (read-only; fetch the new static /catalog.json on demand) - open_template_in_editor (/editor?template=) - generate_architecture_diagram (/editor?generate=, counts toward quota) - open_archdraw_page (fixed list of public pages) Tools only navigate to same-site paths they build. Optional NEXT_PUBLIC_WEBMCP_ORIGIN_TRIAL adds the Chrome origin-trial meta tag. /catalog.json is allowed in robots.txt.
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robots.ts: keep both sides (catalog.json + the SEO pages). open_archdraw_page now also lists the glossary, the free tools and the comparisons.
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Summary
Lighthouse's Agentic Browsing category scored 2/3. The failing check was WebMCP tool registration: the site registered no tools that a browser agent can call.
components/providers/WebMcpTools.tsx, mounted in the root layout, now registers five tools withdocument.modelContext.registerTool. In browsers without WebMCP it does nothing, and it removes the tools on unmount.search_architecture_templatessearch_system_design_tutorialsopen_template_in_editor/editor?template=<id>generate_architecture_diagram/editor?generate=<description>; counts toward the AI quotaopen_archdraw_pagelib/site/webmcpTools.ts, pure and tested. The tools only navigate to same-site paths they build themselves; an agent can't pass in a URL./catalog.jsonwith templates and tutorials, fetched only when a search tool runs, so pages don't carry the list. It's allowed inrobots.txt.NEXT_PUBLIC_WEBMCP_ORIGIN_TRIALadds the Chrome origin-trial meta tag (documented in.env.example).Test plan
tscclean, site and design-guard tests pass (76), eslint clean/catalog.jsonserves locallychrome://flags/#enable-webmcp-testing: on the preview,await document.modelContext.getTools()lists the five toolsNEXT_PUBLIC_WEBMCP_ORIGIN_TRIALin Vercel