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 webhooksgit 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/webhooks)<a href="https://agentmods.dev/skills/khadinakbarlabs/shopify-app-builder/webhooks"><img src="https://agentmods.dev/badge/skills/khadinakbarlabs/shopify-app-builder/webhooks/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/khadinakbarlabs/shopify-app-builder/webhooks"><img src="https://agentmods.dev/badge/skills/khadinakbarlabs/shopify-app-builder/webhooks.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00020 | $0.00478 |
| Opus 5.5 | $0.00008 | $0.00191 |
| Sonnet 5.5 | $0.00004 | $0.00096 |
| Haiku 4.5 | $0.00002 | $0.00048 |
Grade A, and why
webhooks 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 23d 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 — 39 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Handle Shopify events reliably
Start here
A webhook is Shopify notifying your app about an event.
First useful outcome: Receive a valid event and reject an invalid signature in tests. Ask only for missing information that changes this task. Inspect the existing project and use synthetic data before touching a merchant store. Explain the next action and its expected result in plain language; offer a recommended default with its tradeoff.
Guided workflow
- Check current topic, API version and config; use the framework's supported webhook authentication over custom verification where available.
- For custom verification, authenticate the raw body with constant-time HMAC comparison before trusting parsed content; never log secret/payload data.
- Durably enqueue accepted work before acknowledgement, isolate shops, deduplicate event IDs and bound retries.
- Implement uninstall and applicable compliance topics with real export/deletion behavior, retention policy and tests.
Check it worked
Test invalid signature, altered body, duplicates, delayed/out-of-order delivery, queue failure and cleanup; a CLI sample alone may not verify real subscription delivery. Report what was changed, what was tested, and what still needs account access or live verification. Do not claim production readiness or approval from generated code alone.
If you get stuck
Do not acknowledge work that can be lost immediately after response or return success for a failed cleanup. Give one safe next step and a redacted error example, not a list of speculative fixes.
Safety and optional depth
Use only the user's selected project/accounts. Never read credential caches or request secrets in chat; the operator configures the application's approved secret store. Ask before live deployment, store mutations, billing, publication or paid runs unless that exact action is already authorized. No MCP service is required by this plugin.
For concrete examples in an existing project, read only the relevant section of technical-guide.md. These retained v1.x examples are version-sensitive, not the default template. Verify SDKs, schema fields, CLI flags and platform rules with official documentation before using them.
What ships with it
1 file 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.
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.
- 23d ago Changed · -593 lines · -57 tokens per session c3ba8ae8fcb4
- 25d ago Changed · +1 lines 2954aab02079
- 1mo ago First seen · 631 lines · 77 tokens per session scan A f3312ab84b6e
webhooks is a skill published in the GitHub repository khadinakbarlabs/shopify-app-builder (2 stars, last pushed 15d ago), licensed MIT. It adds 20 tokens to every session and 478 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-08-31.
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