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 skills add khadinakbarlabs/shopify-app-builder --skill app-performancegit clone --depth 1 https://github.com/khadinakbarlabs/shopify-app-builderWrote 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/khadinakbarlabs/shopify-app-builder/app-performance)<a href="https://agentmods.dev/skills/khadinakbarlabs/shopify-app-builder/app-performance"><img src="https://agentmods.dev/badge/skills/khadinakbarlabs/shopify-app-builder/app-performance.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 | $0.00156 | $0.07903 |
| Opus 5 | $0.00078 | $0.03952 |
| Sonnet 5 | $0.00031 | $0.01581 |
| Haiku 4.5 | $0.00016 | $0.00790 |
Grade A, and why
app-performance scanned grade A with 1 finding 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 8d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
│ │ Verify with curl timing on cold vs warm: curl -w "%{time_total}\n" -o /dev/null -s URL How it starts
The opening of the file, as written. The whole thing — 801 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Shopify Embedded App Performance
Fix slow Shopify embedded apps before Built for Shopify rejects them, merchants uninstall, and Shopify demotes you in App Store search. The Web Vitals are the gate. Everything below is how you walk through it.
1. When to use this skill
Trigger this skill when:
shopify app devruns but the embedded iframe takes 4+ seconds to render- BFS review comes back "fails performance" with no specifics
- Lighthouse on your admin route scores below 70
- Web Vitals API reports LCP > 2.5s, INP > 200ms, or CLS > 0.1 over 28 days
- Your bundle is > 500KB gzipped and you don't know why
- GraphQL queries are returning
THROTTLED(as 200 OK, not 429) - Prisma queries take 800ms+ in production but 40ms locally
- Webhook handlers are taking > 2 seconds and triggering Shopify retries
- A merchant DMs you "your app is the slowest thing in my admin"
- You're about to submit for Built for Shopify and want to pass on the first try
Don't use this skill for storefront / theme performance — that's a different problem (theme app extensions, web pixels, checkout extensions). This skill is about the admin embedded surface and the server behind it.
2. Built for Shopify performance thresholds (current)
These are the exact numbers. Memorize them.
Core Web Vitals (admin, measured via App Bridge Web Vitals API)
| Metric | Threshold | Measurement window | Min sample size |
|---|---|---|---|
| LCP (Largest Contentful Paint) | ≤ 2.5s (p75) | 28 days | 100 calls |
| INP (Interaction to Next Paint) | ≤ 200ms (p75) | 28 days | 100 calls |
| CLS (Cumulative Layout Shift) | ≤ 0.1 (p75) | 28 days | 100 calls |
| TTI (Time to Interactive) | Aim ≤ 3.8s | Internal target | — |
p75 means 75% of measured launches must be at or under the threshold. One slow merchant doesn't sink you — the long tail does.
Server / API performance
| Metric | Threshold |
|---|---|
| API p95 latency | < 500ms |
| API failure rate | < 0.1% |
| Min requests (28 days) | 1000 (for checkout-adjacent apps) |
| Webhook ACK | < 5s before Shopify retries (target < 2s) |
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.
- 8d ago First seen · 801 lines · 156 tokens per session scan A ec96984678d4
app-performance is a skill published in the GitHub repository khadinakbarlabs/shopify-app-builder (1 stars, last pushed 29d ago), licensed MIT. It adds 156 tokens to every session and 7,903 once invoked, about $0.0008 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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