MediaGo is a cross-platform application for finding and downloading online video streams, including m3u8/HLS media and videos from services such as YouTube and Bilibili. It is for people and automated tools that need to save videos through a desktop app, Docker, browser extension, or HTTP API. The catalogue entries let coding agents operate MediaGo to create downloads and check their progress.
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/mediago-dev/mediago/vercel-react-best-practicesnpx skills add mediago-dev/mediago --skill vercel-react-best-practicesgit clone --depth 1 https://github.com/mediago-dev/mediagoWrote 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/mediago-dev/mediago/vercel-react-best-practices)<a href="https://agentmods.dev/skills/mediago-dev/mediago/vercel-react-best-practices"><img src="https://agentmods.dev/badge/skills/mediago-dev/mediago/vercel-react-best-practices.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 5.1 | $0.00067 | $0.01726 |
| Opus 5 | $0.00034 | $0.00863 |
| Sonnet 5 | $0.00013 | $0.00345 |
| Haiku 4.5 | $0.00007 | $0.00173 |
Grade A, and why
vercel-react-best-practices 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 6d 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.
Copies of this mod
8 near-identical copies found in the catalogue:
- vercel-react-best-practices — 95% identical, 26 lines differ
- vercel-react-best-practices — 94% identical, 27 lines differ
- vercel-react-best-practices — 94% identical, 7 lines differ
- vercel-react-best-practices — 92% identical, 27 lines differ
- vercel-react-best-practices — 92% identical, 27 lines differ
- vercel-react-best-practices — 92% identical, 27 lines differ
- vercel-react-best-practices — 92% identical, 27 lines differ
- vercel-react-best-practices — 92% identical, 27 lines differ
How it starts
The opening of the file, as written. The whole thing — 149 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Vercel React Best Practices
Comprehensive performance optimization guide for React and Next.js applications, maintained by Vercel. Contains 67 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.
When to Apply
Reference these guidelines when:
- Writing new React components or Next.js pages
- Implementing data fetching (client or server-side)
- Reviewing code for performance issues
- Refactoring existing React/Next.js code
- Optimizing bundle size or load times
Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Eliminating Waterfalls | CRITICAL | async- |
| 2 | Bundle Size Optimization | CRITICAL | bundle- |
| 3 | Server-Side Performance | HIGH | server- |
| 4 | Client-Side Data Fetching | MEDIUM-HIGH | client- |
| 5 | Re-render Optimization | MEDIUM | rerender- |
| 6 | Rendering Performance | MEDIUM | rendering- |
| 7 | JavaScript Performance | LOW-MEDIUM | js- |
| 8 | Advanced Patterns | LOW | advanced- |
Quick Reference
1. Eliminating Waterfalls (CRITICAL)
async-cheap-condition-before-await- Check cheap sync conditions before awaiting flags or remote valuesasync-defer-await- Move await into branches where actually usedasync-parallel- Use Promise.all() for independent operationsasync-dependencies- Use better-all for partial dependenciesasync-api-routes- Start promises early, await late in API routesasync-suspense-boundaries- Use Suspense to stream content
2. Bundle Size Optimization (CRITICAL)
bundle-barrel-imports- Import directly, avoid barrel filesbundle-dynamic-imports- Use next/dynamic for heavy componentsbundle-defer-third-party- Load analytics/logging after hydrationbundle-conditional- Load modules only when feature is activatedbundle-preload- Preload on hover/focus for perceived speed
What ships with it
60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- AGENTS.md 100 KB
- README.md 3.3 KB
- rules/_sections.md 1.5 KB
- rules/_template.md 633 B
- rules/advanced-event-handler-refs.md 1.5 KB
- rules/advanced-init-once.md 967 B
- rules/advanced-use-latest.md 1.1 KB
- rules/async-api-routes.md 1.1 KB
- rules/async-cheap-condition-before-await.md 1.2 KB
- rules/async-defer-await.md 2.2 KB
- rules/async-dependencies.md 1.3 KB
- rules/async-parallel.md 659 B
- rules/async-suspense-boundaries.md 2.5 KB
- rules/bundle-barrel-imports.md 2.7 KB
- rules/bundle-conditional.md 966 B
- rules/bundle-defer-third-party.md 928 B
- rules/bundle-dynamic-imports.md 799 B
- rules/bundle-preload.md 1.1 KB
- rules/client-event-listeners.md 2.0 KB
- rules/client-localstorage-schema.md 2.0 KB
- rules/client-passive-event-listeners.md 1.6 KB
- rules/client-swr-dedup.md 1.1 KB
- rules/js-batch-dom-css.md 3.2 KB
- rules/js-cache-function-results.md 1.9 KB
- rules/js-cache-property-access.md 536 B
- rules/js-cache-storage.md 1.6 KB
- rules/js-combine-iterations.md 768 B
- rules/js-early-exit.md 1.1 KB
- rules/js-flatmap-filter.md 1.4 KB
- rules/js-hoist-regexp.md 1.0 KB
- rules/js-index-maps.md 850 B
- rules/js-length-check-first.md 1.7 KB
- rules/js-min-max-loop.md 2.2 KB
- rules/js-request-idle-callback.md 2.6 KB
- rules/js-set-map-lookups.md 532 B
- rules/js-tosorted-immutable.md 1.7 KB
- rules/rendering-activity.md 566 B
- rules/rendering-animate-svg-wrapper.md 1.1 KB
- rules/rendering-conditional-render.md 938 B
- rules/rendering-content-visibility.md 818 B
- rules/rendering-hoist-jsx.md 993 B
- rules/rendering-hydration-no-flicker.md 2.2 KB
- rules/rendering-hydration-suppress-warning.md 852 B
- rules/rendering-resource-hints.md 2.6 KB
- rules/rendering-script-defer-async.md 1.8 KB
- rules/rendering-svg-precision.md 588 B
- rules/rendering-usetransition-loading.md 2.0 KB
- rules/rerender-defer-reads.md 983 B
- rules/rerender-dependencies.md 833 B
- rules/rerender-derived-state-no-effect.md 1.2 KB
- rules/rerender-derived-state.md 732 B
- rules/rerender-functional-setstate.md 2.9 KB
- rules/rerender-lazy-state-init.md 2.0 KB
- rules/rerender-memo-with-default-value.md 1.1 KB
- rules/rerender-memo.md 1.1 KB
- rules/rerender-move-effect-to-event.md 1.2 KB
- rules/rerender-no-inline-components.md 2.1 KB
- rules/rerender-simple-expression-in-memo.md 1023 B
- rules/rerender-split-combined-hooks.md 1.8 KB
- rules/rerender-transitions.md 1.0 KB
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.
- 6d ago First seen · 149 lines · 67 tokens per session scan A ad2e0b0ef2bb
vercel-react-best-practices is a skill published in the GitHub repository mediago-dev/mediago (9,209 stars, last pushed 2d ago), licensed MIT. It adds 67 tokens to every session and 1,726 once invoked, about $0.0003 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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