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 zarpay/rails-template --skill hwc-stimulus-fundamentalsgit clone --depth 1 https://github.com/zarpay/rails-templateWrote 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/zarpay/rails-template/hwc-stimulus-fundamentals)<a href="https://agentmods.dev/skills/zarpay/rails-template/hwc-stimulus-fundamentals"><img src="https://agentmods.dev/badge/skills/zarpay/rails-template/hwc-stimulus-fundamentals/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/zarpay/rails-template/hwc-stimulus-fundamentals"><img src="https://agentmods.dev/badge/skills/zarpay/rails-template/hwc-stimulus-fundamentals.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 | $0.00122 | $0.00583 |
| Opus 5 | $0.00061 | $0.00292 |
| Sonnet 5 | $0.00024 | $0.00117 |
| Haiku 4.5 | $0.00012 | $0.00058 |
Grade A, and why
hwc-stimulus-fundamentals 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 11d 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.
This is a copy
100% identical to hwc-stimulus-fundamentals — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Stimulus Fundamentals
Implement robust Stimulus controllers with clear lifecycle and state boundaries.
Core Workflow
- Define controller contract first: targets, values, outlets, actions, and expected lifecycle.
- Keep state transitions in value callbacks when reactive updates are required.
- Guard callbacks that can run before
connect()completes. - Use
connect()/disconnect()for setup and teardown symmetry. - Isolate DOM event handling from business rules; keep controllers composable.
Guardrails
- Prefer declarative action parameters over manual dataset parsing.
- Use outlets for controller-to-controller communication instead of private internals.
- Keep target callbacks idempotent; account for repeated connect/disconnect cycles.
- Use MutationObserver only when DOM-driven reactivity is required.
- Feature-detect browser APIs before exposing UI affordances.
Load References Selectively
Open only the file needed for the current request.
- Value changed callbacks:
references/2023-08-29-stimulus-value-changed-callbacks.md - Keyboard action filters and hotkeys:
references/2023-10-24-stimulus-keyboardevent-101.md - MutationObserver-based sorting:
references/2023-12-05-stimulus-auto-sorting.md - Outlets API communication:
references/2023-12-19-stimulus-outlets-api.md - Target callback orchestration:
references/2024-05-07-stimulus-target-callbacks.md - Web Share API integration:
references/2025-11-25-stimulus-web-share-api.md - Core Web Vitals and lazy-loading fundamentals:
references/2024-06-18-fundamentals-core-web-vitals.md
Use references/INDEX.md for the full catalog.
Escalate to Neighbor Skills
- Form-centric behavior: use
hwc-forms-validation - Navigation/history/cache with Turbo: use
hwc-navigation-content - Turbo Stream/WebSocket orchestration: use
hwc-realtime-streaming - Media integrations and playback concerns: use
hwc-media-content - UX feedback/transitions/progress concerns: use
hwc-ux-feedback
What ships with it
8 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.
- references/2023-08-29-stimulus-value-changed-callbacks.md 4.5 KB
- references/2023-10-24-stimulus-keyboardevent-101.md 6.1 KB
- references/2023-12-05-stimulus-auto-sorting.md 3.9 KB
- references/2023-12-19-stimulus-outlets-api.md 6.3 KB
- references/2024-05-07-stimulus-target-callbacks.md 6.0 KB
- references/2024-06-18-fundamentals-core-web-vitals.md 4.3 KB
- references/2025-11-25-stimulus-web-share-api.md 3.6 KB
- references/INDEX.md 1.3 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.
- 11d ago First seen · 48 lines · 122 tokens per session scan A 3f1a2a1bc9d2
hwc-stimulus-fundamentals is a skill published in the GitHub repository zarpay/rails-template (9 stars, last pushed 29d ago), licensed MIT. It adds 122 tokens to every session and 583 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to hwc-stimulus-fundamentals, differing in 0 lines, and is treated as a copy.
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