Modern Web Guidance is a source repository for coding-agent skills that provide web-platform guidance, recommended practices, and browser compatibility information. It helps coding agents choose newer web APIs and patterns when generating web applications. The catalogue skills are the guidance produced and maintained by this project.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/googlechrome/modern-web-guidance-src/project-guide-validationnpx skills add GoogleChrome/modern-web-guidance-src --skill project-guide-validationgit clone --depth 1 https://github.com/GoogleChrome/modern-web-guidance-srcWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/googlechrome/modern-web-guidance-src/project-guide-validation)<a href="https://agentmods.dev/skills/googlechrome/modern-web-guidance-src/project-guide-validation"><img src="https://agentmods.dev/badge/skills/googlechrome/modern-web-guidance-src/project-guide-validation.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00039 | $0.02008 |
| Opus 5 | $0.00019 | $0.01004 |
| Sonnet 5 | $0.00008 | $0.00402 |
| Haiku 4.5 | $0.00004 | $0.00201 |
Grade A, and why
project-guide-validation scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Guide Validation
This protocol defines the process for an AI agent to validate the technical accuracy, framework nuances, and evaluation readiness of web guidance. It ensures that guidance is not only correct according to documentation but also robust in practice across different framework reactivity models and target environments.
Validation Checklist
When assigned to validate a guide, create a task list artifact based on this checklist and complete each phase:
- 1. Familiarization
- 2. Best Practices & Accessibility Review
- 3. Expectation Alignment
- 4. Testing and Verification with DevTools MCP (Includes starting server)
- 5. Manual Verification (Only if automated tests pass)
- 6. Feedback Report
1. Familiarization
Before performing any verification, read the guide.md file in its entirety:
- Understand the Problem: Identify the core issue the guide is addressing (e.g., reactive state drift, layout shift, performance bottleneck).
- Identify the Solution: Understand the recommended API, property, or architectural approach (e.g., Temporal API, container queries, scheduler.yield).
- Contextualize: Get familiar with the overall structure and flow of the guidance before checking external sources or running tests.
2. Qualitative & Best Practices Review
Critically evaluate the guide's content to ensure it follows established best practices and does not introduce anti-patterns:
- Discipline-Specific Skills: Check if there are finalized "production ready" skill files for the relevant discipline located at
guides/<discipline>/skill.md. If they exist, ensure the guide complies with them. - Accessibility (A11y): Accessibility is a distinct concern that MUST always be evaluated. The canonical reference is
guides/accessibility/accessibility/guide.md. Read it first, then apply it as follows:guide.mdunder review: MUST adhere to every applicable best practice across all sections of the canonical guide (landmarks/headings, ARIA roles, names/descriptions, focus management, keyboard navigation, alt text and SVG treatment, hints and validation, live regions, non-color state indicators, reduced motion, dialog/overlay semantics, and visibility hiding decisions). Recommendations and code samples must not contradict the canonical guide. Pay particular attention to copy-paste safety (code examples must embed the rules they mention, e.g.prefers-reduced-motion,:focus-visible,aria-hidden), multi-indicator state communication, AT-tree synchronization with visibility changes, and post-transition focus management.demo.htmlunder review: NOT held to general a11y best practices — only required to faithfully demonstrate the patterns theguide.mdprescribes. If the guide mandates a specific a11y pattern (e.g.,aria-live="polite"on toasts,aria-pressedon a toggle,prefers-reduced-motionin CSS), the demo MUST show it. Do not flag demos for missing a11y features that the guide does not call out.expectations.mdunder review: SHOULD encode the a11y patterns that the guide prescribes as testable expectations, but MUST NOT include prose-only or manual-verification-only requirements that the grader cannot assert.
- Avoid Gating Critical Content: Verify that the guide does not recommend interactive reveal patterns (e.g., following the cursor) that are inaccessible to non-pointer users. Ensure accessible alternatives are provided if such patterns are discussed.
- Internal Consistency: Ensure no deviations from existing skills or established patterns in the project.
- Copy-Paste Safety: Ensure that code examples are complete and safe to copy. If the text recommends a fallback or a constraint (like reduced motion), the code example MUST implement it.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 95 lines · 39 tokens per session scan A 49a16cc3b944
project-guide-validation is a skill published in the GitHub repository GoogleChrome/modern-web-guidance-src (1,010 stars, last pushed yesterday), licensed Apache-2.0. It adds 39 tokens to every session and 2,008 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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