Callstack Agent Skills is a collection of instructions that gives AI coding assistants practical knowledge for building React Native applications. Developers use it for app development, performance, navigation, testing, CI, device automation, and migrations to React Native. The catalogue entries are the project's skills, rules, and instructions for compatible coding assistants.
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/callstackincubator/agent-skills/react-native-tv-best-practicesnpx skills add callstackincubator/agent-skills --skill react-native-tv-best-practicesgit clone --depth 1 https://github.com/callstackincubator/agent-skillsWrote 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/callstackincubator/agent-skills/react-native-tv-best-practices)<a href="https://agentmods.dev/skills/callstackincubator/agent-skills/react-native-tv-best-practices"><img src="https://agentmods.dev/badge/skills/callstackincubator/agent-skills/react-native-tv-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 | $0.00091 | $0.02417 |
| Opus 5 | $0.00046 | $0.01208 |
| Sonnet 5 | $0.00018 | $0.00483 |
| Haiku 4.5 | $0.00009 | $0.00242 |
Grade A, and why
react-native-tv-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.
How it starts
The opening of the file, as written. The whole thing — 151 lines — stays where its author put it; the contents beside it link to each section on GitHub.
React Native TV Best Practices
Overview
TV-specific review guidance for React Native-backed apps on Apple TV, Android TV, Fire TV, Amazon Vega/Kepler, and web-based TV targets such as Tizen or webOS.
Use this skill only for TV deltas: remote input, focus engines, 10-foot layout, platform packaging, playback/DRM, low-memory TV hardware, and TV accessibility. For ordinary React Native performance or architecture issues, use react-native-best-practices.
Skill Format
Reference files are grouped by topic prefix:
focus-*: focus engines, focus guides, focus event performancenav-*: D-pad navigation, Back/Menu behavior, keyboard/search inputdesign-*: 10-foot typography, layout, color, focus visibilityperf-*: startup, memory, lists, animation, and network constraints on TV hardwarevideo-*: playback architecture, DRM/protocol selection, debugginga11y-*: TV accessibility implementation and audit checkssetup-*: stack detection, setup, architecture, cross-platform behaviortest-*andrelease-*: test coverage, E2E, and CI/release workflows
When to Apply
Apply this skill when the app targets a TV platform and the work involves:
- Focus movement, visible focus, focus restoration, or remote/D-pad input
- TV layout readability, overscan/safe areas, or 10-foot UI density
- TV player controls, manifests, DRM, decoder support, or playback errors
- Performance on low-memory TV hardware, especially with video or large carousels
- TV accessibility with screen readers, captions, focus order, or remote-only interaction
- Platform setup for
react-native-tvos, Expo TV, Amazon Vega/Kepler, Tizen, or webOS
Before You Start — Identify the TV Stack
This skill covers several TV stacks. Detect which one the app targets before flagging setup issues — demanding react-native-tvos, a tvOS Podfile, or an Android TV manifest on a Vega/Kepler or web-based TV app produces false positives.
| Stack | How to detect | Setup expectations |
|---|---|---|
| react-native-tvos (Apple TV, Android TV, Fire TV) | "react-native": "npm:react-native-tvos@…" in package.json |
tvOS Podfile (platform :tvos); Android TV leanback/LEANBACK_LAUNCHER manifest entries; TV emulator/simulator |
| Expo + react-native-tvos | above plus @react-native-tvos/config-tv in app.json |
EXPO_TV=1 prebuild; react-native-tvos version must match the Expo SDK; not all Expo features/libraries are available on TV |
| Amazon Vega / Kepler | Vega/Kepler SDK & tooling (@amazon-devices/* deps, Kepler manifest); no react-native-tvos |
Amazon's Vega/Kepler toolchain — react-native-tvos, tvOS Podfile, and Android TV manifest do not apply |
| Web-based TV (Tizen, webOS) | web bundler (Rsbuild/webpack) + platform packaging; spatial-nav library | Platform SDK packaging; @noriginmedia/norigin-spatial-navigation for focus |
What ships with it
28 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/openai.yaml 307 B
- references/a11y-checklist.md 4.3 KB
- references/a11y-implementation.md 4.4 KB
- references/a11y-overview.md 2.8 KB
- references/design-10foot.md 3.0 KB
- references/design-color.md 3.8 KB
- references/design-layout.md 3.0 KB
- references/design-typography.md 2.6 KB
- references/focus-management.md 6.4 KB
- references/focus-performance.md 3.5 KB
- references/nav-directional.md 3.6 KB
- references/nav-keyboard.md 3.6 KB
- references/nav-patterns.md 4.4 KB
- references/perf-animations.md 3.0 KB
- references/perf-lists.md 3.3 KB
- references/perf-memory.md 2.5 KB
- references/perf-network.md 2.7 KB
- references/perf-overview.md 3.6 KB
- references/release-cicd.md 3.2 KB
- references/setup-architecture.md 3.8 KB
- references/setup-cross-platform.md 3.3 KB
- references/setup-getting-started.md 5.1 KB
- references/test-e2e.md 3.6 KB
- references/test-javascript.md 3.7 KB
- references/test-strategy.md 2.3 KB
- references/video-debugging.md 1.6 KB
- references/video-players.md 3.2 KB
- references/video-streaming.md 2.1 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 · 151 lines · 91 tokens per session scan A 46b4524c57ce
react-native-tv-best-practices is a skill published in the GitHub repository callstackincubator/agent-skills (1,638 stars, last pushed 28d ago), licensed MIT. It adds 91 tokens to every session and 2,417 once invoked, about $0.0005 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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