React Native Expert
Jeffallan/claude-skills
Builds React Native and Expo apps for iOS and Android: Expo Router navigation, FlatList tuning, platform-specific code and build error recovery.
Measure React Native performance on-device for stream-chat-react-native — Hermes CPU profiles, deterministic call/listener counting, component render profiling, and memory/jank capture.
Install Perf Benchmarking
$ npx skills add GetStream/stream-chat-react-native --skill perf-benchmarking -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install GetStream/stream-chat-react-native perf-benchmarking --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/GetStream/stream-chat-react-native.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/perf-benchmarking .claude/skills/perf-benchmarking && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "perf-benchmarking" agent skill from https://github.com/GetStream/stream-chat-react-native/tree/develop/.claude/skills/perf-benchmarking into .claude/skills/perf-benchmarking/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "perf-benchmarking", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/GetStream/stream-chat-react-native/tree/develop/.claude/skills/perf-benchmarkingType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add GetStream/stream-chat-react-native --skill perf-benchmarking -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install GetStream/stream-chat-react-native perf-benchmarking --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/GetStream/stream-chat-react-native.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/perf-benchmarking .agents/skills/perf-benchmarking && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "perf-benchmarking" agent skill from https://github.com/GetStream/stream-chat-react-native/tree/develop/.claude/skills/perf-benchmarking into .agents/skills/perf-benchmarking/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "perf-benchmarking", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add GetStream/stream-chat-react-native --skill perf-benchmarking -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install GetStream/stream-chat-react-native perf-benchmarking --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/GetStream/stream-chat-react-native.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/perf-benchmarking .cursor/skills/perf-benchmarking && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "perf-benchmarking" agent skill from https://github.com/GetStream/stream-chat-react-native/tree/develop/.claude/skills/perf-benchmarking into .cursor/skills/perf-benchmarking/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "perf-benchmarking", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/GetStream/stream-chat-react-native.git --path .claude/skills/perf-benchmarking--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add GetStream/stream-chat-react-native --skill perf-benchmarking -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install GetStream/stream-chat-react-native perf-benchmarking --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/GetStream/stream-chat-react-native.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/perf-benchmarking .gemini/skills/perf-benchmarking && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "perf-benchmarking" agent skill from https://github.com/GetStream/stream-chat-react-native/tree/develop/.claude/skills/perf-benchmarking into .gemini/skills/perf-benchmarking/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "perf-benchmarking", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install GetStream/stream-chat-react-native perf-benchmarkingInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add GetStream/stream-chat-react-native --skill perf-benchmarking -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/GetStream/stream-chat-react-native.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/perf-benchmarking .github/skills/perf-benchmarking && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "perf-benchmarking" agent skill from https://github.com/GetStream/stream-chat-react-native/tree/develop/.claude/skills/perf-benchmarking into .github/skills/perf-benchmarking/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "perf-benchmarking", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add GetStream/stream-chat-react-native --skill perf-benchmarking -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install GetStream/stream-chat-react-native perf-benchmarking --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/GetStream/stream-chat-react-native.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/perf-benchmarking .opencode/skills/perf-benchmarking && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "perf-benchmarking" agent skill from https://github.com/GetStream/stream-chat-react-native/tree/develop/.claude/skills/perf-benchmarking into .opencode/skills/perf-benchmarking/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "perf-benchmarking", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
perf-benchmarking- GitHub stars
- 1.2k
- Token cost
- ~5.6k tokens
- SKILL.md length
- 2,593 words
- Files
- 1
- Skills in repo
- 3
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Measure React Native performance on-device for stream-chat-react-native — Hermes CPU profiles, deterministic call/listener counting, component render profiling, and memory/jank capture.
- Works in 4 steps: Deterministic call/listener counting —… → Hermes CPU profile + diff… → Driving the device — scenarios on… → …
- Asked to benchmark a change
- SKILL.md covers What we're measuring for, Non-negotiable rules, The toolbox (perf/) and Execution patterns, plus 6 more sections
- Calls adb, node and git
What it does
Perf Benchmarking is an agent skill from GetStream/stream-chat-react-native. Measure React Native performance on-device for stream-chat-react-native — Hermes CPU profiles, deterministic call/listener counting, component render profiling, and memory/jank capture. Use when asked to benchmark a change, prove or disprove a perf claim, compare before/after, find what re-renders or what's heavy on the JS thread, or "do some perf testing". Drives the SampleApp on a connected Android device via the perf/ toolkit. Read this BEFORE measuring — it encodes which instrument to pick and the methodology…
Its SKILL.md is about 5.6k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Mobile, covering Cross-platform mobile apps and Mobile performance. It works with React Native and Android. The repository describes itself as: 💬 React-Native Chat SDK ➜ Stream Chat. Includes a tutorial on building your own chat app experience using React-Native, React-Navigation and Stream.
When your agent uses it
- Asked to benchmark a change
- Disprove a perf claim
- Compare before/after
- Find what re-renders
Example prompts
- “s heavy on the JS thread, or”
- “/perf-benchmarking”
Workflow steps
4 steps, taken from the step headings in SKILL.md.
- Deterministic call/listener counting — the reliable default
- Hermes CPU profile + diff (non-interactive)
- Driving the device — scenarios on scenario-lib.sh
- A/B around a committed change (git-hands-off-safe)
What it can do on your machine
Read from SKILL.md and the folder at commit 4de08ed. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
adbnodegitbashyarncurlxcrun
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use git, yarn and curl, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Perf Benchmarking loads about 5.6k tokens when it runs. Until then it costs about 141 tokens; SKILL.md has 2,593 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 2,593 words (~5,604 tokens).
“How to measure SDK performance for real, against the SampleApp running on a physical Android device, using the committed perf/ toolkit. This skill exists because the methodology is full of traps that produce confidently-wrong numbers; follow the rules and recipes…”
- name
- perf-benchmarking
Files
Just SKILL.md in .claude/skills/perf-benchmarking of GetStream/stream-chat-react-native.
Open the folder on GitHubat commit 4de08ed
Compare with similar skills
Perf Benchmarking next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Perf Benchmarking this skillGetStream/stream-chat-react-native | 1.2k | — | ~5.6k | Automated safety check: Pass | Custom licence | |
| React Native ExpertJeffallan/claude-skills | 12k | — | ~1.7k | Automated safety check: Pass | MIT | |
| Senior Mobileborghei/Claude-Skills | 881 | — | ~1.9k | Automated safety check: Pass | MIT | |
| React Native Best Practicesvercel-labs/openreview | 1.7k | 17 repos | ~1.1k | Automated safety check: Pass | MIT | |
| Rnn Codebasewix/react-native-navigation | 13k | — | ~2k | Automated safety check: Pass | MIT | |
| Expo Tailwind SetupCherryHQ/cherry-studio-app | 4k | 8 repos | ~3k | Automated safety check: Pass | MIT |
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Related
Works with
Categories
Questions about Perf Benchmarking
What does Perf Benchmarking do?
Measure React Native performance on-device for stream-chat-react-native — Hermes CPU profiles, deterministic call/listener counting, component render profiling, and memory/jank capture. Perf Benchmarking is an agent skill from GetStream/stream-chat-react-native. Measure React Native performance on-device for stream-chat-react-native — Hermes CPU profiles, deterministic call/listener counting, component render profiling, and memory/jank capture.
When should I use Perf Benchmarking?
Perf Benchmarking fits situations like: asked to benchmark a change; disprove a perf claim; compare before/after; find what re-renders.
How do I install Perf Benchmarking in Claude Code?
Run `npx skills add GetStream/stream-chat-react-native --skill perf-benchmarking -a claude-code`. Or copy the skill folder (.claude/skills/perf-benchmarking in GetStream/stream-chat-react-native) into .claude/skills/perf-benchmarking in your project. Claude Code loads it when a task matches its description.
How do I install Perf Benchmarking in Codex?
Run `npx skills add GetStream/stream-chat-react-native --skill perf-benchmarking -a codex`. Or copy the skill folder (.claude/skills/perf-benchmarking in GetStream/stream-chat-react-native) into .agents/skills/perf-benchmarking in your project. Codex loads it when a task matches its description.
Can I use Perf Benchmarking in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add GetStream/stream-chat-react-native --skill perf-benchmarking -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/perf-benchmarking, .gemini/skills/perf-benchmarking, .github/skills/perf-benchmarking and .opencode/skills/perf-benchmarking in your project.
What does Perf Benchmarking need to run?
Going by SKILL.md and its folder, Perf Benchmarking needs the command-line tools its instructions call (adb, node, git, bash, yarn and curl).
Does Perf Benchmarking access the network?
SKILL.md contains no URLs. Its commands use git and curl, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Perf Benchmarking safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Perf Benchmarking use?
Perf Benchmarking has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Perf Benchmarking use?
About 5.6k tokens (SKILL.md is roughly 22k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Perf Benchmarking?
Skills that share tags, products or a category with Perf Benchmarking: React Native Expert (Jeffallan/claude-skills, 12k stars), Senior Mobile (borghei/Claude-Skills, 881 stars), React Native Best Practices (vercel-labs/openreview, 1.7k stars) and Rnn Codebase (wix/react-native-navigation, 13k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Perf Benchmarking?
GetStream (a GitHub organization) maintains it in GetStream/stream-chat-react-native, which has 1,180 GitHub stars. The repository holds 3 skills in this directory. The repository was last updated on October 7, 2026.
Source: GetStream/stream-chat-react-native on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.