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/jeremydev87/codingbuddy/widget-slot-architecturenpx skills add JeremyDev87/codingbuddy --skill widget-slot-architecturegit clone --depth 1 https://github.com/JeremyDev87/codingbuddyWrote 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/jeremydev87/codingbuddy/widget-slot-architecture)<a href="https://agentmods.dev/skills/jeremydev87/codingbuddy/widget-slot-architecture"><img src="https://agentmods.dev/badge/skills/jeremydev87/codingbuddy/widget-slot-architecture.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 | $0.00043 | $0.05152 |
| Opus 5 | $0.00022 | $0.02576 |
| Sonnet 5 | $0.00009 | $0.01030 |
| Haiku 4.5 | $0.00004 | $0.00515 |
Grade A, and why
widget-slot-architecture 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 today.
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 — 754 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Widget-Slot Architecture (WSA)
Overview
Widget-Slot Architecture (WSA) is a frontend architecture pattern that leverages Next.js App Router's Parallel Routes feature to strictly separate interaction logic from static layouts and manage each feature as an independent widget unit.
Core Principle: Layouts handle structure only; logic is isolated in widgets.
Requirements: Next.js 13.4+ (App Router with Parallel Routes support)
When to Use
Use this skill:
- Designing large-scale Next.js App Router projects
- When multiple independent dynamic regions are needed within a page
- Projects requiring team-based parallel development
- Services where feature-level fault isolation is critical
- When widget reusability and portability are required
Not needed for:
- Simple static pages
- Small projects (over-abstraction)
- Pages Router based projects (Parallel Routes not supported)
Philosophy (5 Core Principles)
1. Separation of Concerns and Static Shell Maintenance
Layouts provide only the structural framework and contain no complex interactions. All dynamic elements are isolated in widgets.
2. Independent Self-Containment
Widgets minimize external dependencies and handle their own data. A widget should work immediately when moved to a different page's slot.
3. Standardized Fault Isolation
All dynamic regions (Slots) have independent Error Boundaries and Suspense. A feature's error should not cause the entire page to collapse.
4. Server-Centric Data Flow
Widget communication prioritizes server data cache invalidation (revalidateTag) or URL state over direct state sharing.
5. Plug & Play Development
Widgets are designed like Lego blocks. Developers have extreme freedom to 'add' new features to slots or 'remove' unnecessary ones without affecting business logic.
Definitions
| Term | Definition |
|---|---|
| Layout | Static structure of the service. Contains only visual elements without interactions and determines Slot positions |
| Slot | Dynamic region defined within a Layout. Implemented via Next.js Parallel Routes (@slot), managing individual loading and error states |
| Widget | Actual business logic unit inserted into a Slot. Includes API calls, data mutations (Actions), and user interactions (Forms, Modals, etc.) |
| Component | Reusable UI pieces used generically. Has no business logic or only very simple input elements |
What ships with it
2 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.
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.
- today First seen · 754 lines · 43 tokens per session scan A e9c67bbe6446
widget-slot-architecture is a skill published in the GitHub repository JeremyDev87/codingbuddy (31 stars, last pushed 4mo ago), licensed MIT. It adds 43 tokens to every session and 5,152 once invoked, about $0.0002 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 2026-09-03.
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