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 khanhhuyenngo985-sys/character-scene-design-skills --skill backend-patternsgit clone --depth 1 https://github.com/khanhhuyenngo985-sys/character-scene-design-skillsWrote 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/khanhhuyenngo985-sys/character-scene-design-skills/backend-patterns)<a href="https://agentmods.dev/skills/khanhhuyenngo985-sys/character-scene-design-skills/backend-patterns"><img src="https://agentmods.dev/badge/skills/khanhhuyenngo985-sys/character-scene-design-skills/backend-patterns/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/khanhhuyenngo985-sys/character-scene-design-skills/backend-patterns"><img src="https://agentmods.dev/badge/skills/khanhhuyenngo985-sys/character-scene-design-skills/backend-patterns.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 | $0.00031 | $0.03335 |
| Opus 5 | $0.00015 | $0.01667 |
| Sonnet 5 | $0.00006 | $0.00667 |
| Haiku 4.5 | $0.00003 | $0.00333 |
Grade A, and why
backend-patterns 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 9d 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.
const requests = this.requests.get(identifier) || [] The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 9d ago First seen · 599 lines · 31 tokens per session scan A 952e95fd7e8d
backend-patterns is a skill published in the GitHub repository khanhhuyenngo985-sys/character-scene-design-skills (10 stars, last pushed 3mo ago), with no licence file. It adds 31 tokens to every session and 3,335 once invoked, about $0.0002 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 2026-09-03.
Other skills, from other repositories
system-and-data-design
Decide whether the system will hold, and where the data lives: requirements and load first, then back-of-the-envelope numbers, building blocks (cache, queue, load balancer, CDN), and the data layer in depth — storage engines, indexes, replication, partitioning, transactions and consistency, batch vs stream. Use when…
multi-tenancy
Use when working with the multi-tenant architecture — customer DB switching, FQDN routing, tenant isolation, or cross-tenant operations.
convex
Use when building with Convex, writing Convex functions, queries, mutations, actions, HTTP endpoints, defining database schemas/validators, configuring cron jobs, file storage, realtime subscriptions, AI agents, or security audits.
eloquent
Use when writing Eloquent models, relationships, scopes, or queries via Model:: — 'fetch users with their orders'. NOT for PHPStan output, non-Eloquent services, or raw SQL questions.
rails-performance
Ruby on Rails performance conventions — N+1 prevention, caching, database tuning, benchmarking. Use when optimizing queries, adding caching, or profiling performance.
bullmq-specialist
BullMQ expert for Redis-backed job queues, background processing, and reliable async execution in Node.js/TypeScript applications. Use when: bullmq, bull queue, redis queue, background job, job queue.