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 liuchiawei/agent-skills --skill backend-dev-guidelinesgit clone --depth 1 https://github.com/liuchiawei/agent-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/liuchiawei/agent-skills/backend-dev-guidelines)<a href="https://agentmods.dev/skills/liuchiawei/agent-skills/backend-dev-guidelines"><img src="https://agentmods.dev/badge/skills/liuchiawei/agent-skills/backend-dev-guidelines.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 | $0.00054 | $0.01701 |
| Opus 5 | $0.00027 | $0.00851 |
| Sonnet 5 | $0.00011 | $0.00340 |
| Haiku 4.5 | $0.00005 | $0.00170 |
Grade A, and why
backend-dev-guidelines 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 7d 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.
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 ships with it
11 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.
- resources/architecture-overview.md 13 KB
- resources/async-and-errors.md 6.7 KB
- resources/complete-examples.md 16 KB
- resources/configuration.md 5.7 KB
- resources/database-patterns.md 4.8 KB
- resources/middleware-guide.md 5.0 KB
- resources/routing-and-controllers.md 19 KB
- resources/sentry-and-monitoring.md 7.6 KB
- resources/services-and-repositories.md 22 KB
- resources/testing-guide.md 5.3 KB
- resources/validation-patterns.md 18 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.
- 7d ago First seen · 343 lines · 54 tokens per session scan A 93d4a6812973
backend-dev-guidelines is a skill published in the GitHub repository liuchiawei/agent-skills (2 stars, last pushed 6mo ago), with no licence file. It adds 54 tokens to every session and 1,701 once invoked, about $0.0003 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 2026-08-31.
Other skills, from other repositories
architecture-patterns
Implement proven backend architecture patterns including Clean Architecture, Hexagonal Architecture, and Domain-Driven Design. Use when architecting complex backend systems or refactoring existing applications for better maintainability.
agent-communication-protocol
Open protocol for AI agent interoperability enabling standardized communication between agents, applications, and humans across different frameworks.
design-code-architecture
Guided journey from an app idea to a deliberate architecture: boundaries, domain model, data decisions, and resilience, making only the expensive-to-reverse decisions and deferring the rest. Orchestrates eight skills phase by phase - clean-architecture, domain-driven-design, system-design, ddia-systems…
endpoint-validator
Deterministic API endpoint validation with pass/fail reporting.
measure-instrumentation-spec
Specifies what analytics events to track, when they fire, and what properties to include, as a contract between product and engineering that prevents undertracked features. Use before engineering builds a feature or when auditing existing tracking for gaps. For the dashboard built on top of these events, use…
csharp-patterns
C#/.NET: LINQ, async/await, DI, records, nullable refs, ASP.NET Core, EF Core, MediatR. Triggers: C#, .NET, dotnet, ASP.NET, EF Core, LINQ, record type, IServiceCollection.