Modern Web Guidance is an agent skill and CLI that gives coding agents expert-curated guides on current web platform features, so they stop defaulting to legacy JavaScript patterns and heavy polyfills.
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It is stewarded by the Google Chrome, Microsoft Edge, Mozilla Firefox and MDN teams alongside the web development community.
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203 use-case guides covering 250 web platform features
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Offline `search` and `retrieve` commands that return token-efficient guides into the agent's context
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`legacy-scan` maps legacy patterns in a codebase to the guide with the modern replacement
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Opt-in gating for volatile, single-engine features
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Installs via an interactive wizard, `npx skills`, or plugins for Claude Code, Codex, GitHub Copilot CLI, Antigravity, Grok Build and Kimi Code
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Public per-agent and per-guide eval dashboard
Free
Free and open-source under the Apache-2.0 licence. The CLI runs locally and search works offline; your coding agent's own model and token costs still apply.
Best for
Frontend and full-stack developers using coding agents who want generated UI code to use native browser features with sensible fallbacks.
Not ideal for
Backend-only projects, or teams that must support old browsers where the recommended modern features are not available.
A well-scoped, cross-browser backed skill that fixes a common weakness of coding agents on frontend work; worth installing for web projects.
Version 1.0.0, released on November 10, 2026, took the project out of preview with 203 guides, the `legacy-scan` command, a smaller embedding-plus-BM25 search (npm download down from 23.5 MB to 8.8 MB) and joint stewardship by Chrome, Edge, Firefox and MDN.
As of
Is Modern Web Guidance free?+
Yes - Modern Web Guidance is Free. Free and open-source under the Apache-2.0 licence. The CLI runs locally and search works offline; your coding agent's own model and token costs still apply.
Is Modern Web Guidance open source?+
Yes - Modern Web Guidance is open source. Free and open-source under the Apache-2.0 licence. The CLI runs locally and search works offline; your coding agent's own model and token costs still apply.
Who is Modern Web Guidance best for?+
Frontend and full-stack developers using coding agents who want generated UI code to use native browser features with sensible fallbacks.
Who is Modern Web Guidance not ideal for?+
Backend-only projects, or teams that must support old browsers where the recommended modern features are not available.
What are the best Modern Web Guidance alternatives?+
The closest Modern Web Guidance alternatives on ai.dosa.dev are Pieces for Developers, agenttrace, Vibe Kanban - all listed under Developer Productivity & Workflow.
Who makes Modern Web Guidance?+
Modern Web Guidance is developed by Google Chrome. It is listed in the Developer Productivity & Workflow category on ai.dosa.dev.
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