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/duongductrong/cursor-kit/backend-developmentnpx skills add duongductrong/cursor-kit --skill backend-developmentgit clone --depth 1 https://github.com/duongductrong/cursor-kitWrote 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/duongductrong/cursor-kit/backend-development)<a href="https://agentmods.dev/skills/duongductrong/cursor-kit/backend-development"><img src="https://agentmods.dev/badge/skills/duongductrong/cursor-kit/backend-development.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 | $0.00135 | $0.01039 |
| Opus 5 | $0.00068 | $0.00519 |
| Sonnet 5 | $0.00027 | $0.00208 |
| Haiku 4.5 | $0.00014 | $0.00104 |
Grade A, and why
backend-development 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 4d 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
86% identical to ck:backend-development — 5 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.
How it starts
The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Backend Development Skill
Production-ready backend development with modern technologies, best practices, and proven patterns.
When to Use
- Designing RESTful, GraphQL, or gRPC APIs
- Building authentication/authorization systems
- Optimizing database queries and schemas
- Implementing caching and performance optimization
- OWASP Top 10 security mitigation
- Designing scalable microservices
- Testing strategies (unit, integration, E2E)
- CI/CD pipelines and deployment
- Monitoring and debugging production systems
Technology Selection Guide
Languages: Node.js/TypeScript (full-stack), Python (data/ML), Go (concurrency), Rust (performance) Frameworks: NestJS, FastAPI, Django, Express, Gin Databases: PostgreSQL (ACID), MongoDB (flexible schema), Redis (caching) APIs: REST (simple), GraphQL (flexible), gRPC (performance)
See: references/backend-technologies.md for detailed comparisons
Reference Navigation
Core Technologies:
backend-technologies.md- Languages, frameworks, databases, message queues, ORMsbackend-api-design.md- REST, GraphQL, gRPC patterns and best practices
Security & Authentication:
backend-security.md- OWASP Top 10 2025, security best practices, input validationbackend-authentication.md- OAuth 2.1, JWT, RBAC, MFA, session management
Performance & Architecture:
backend-performance.md- Caching, query optimization, load balancing, scalingbackend-architecture.md- Microservices, event-driven, CQRS, saga patterns
Quality & Operations:
backend-testing.md- Testing strategies, frameworks, tools, CI/CD testingbackend-code-quality.md- SOLID principles, design patterns, clean codebackend-devops.md- Docker, Kubernetes, deployment strategies, monitoringbackend-debugging.md- Debugging strategies, profiling, logging, production debuggingbackend-mindset.md- Problem-solving, architectural thinking, collaboration
Key Best Practices (2025)
Security: Argon2id passwords, parameterized queries (98% SQL injection reduction), OAuth 2.1 + PKCE, rate limiting, security headers
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.
- references/backend-api-design.md 10 KB
- references/backend-architecture.md 12 KB
- references/backend-authentication.md 9.2 KB
- references/backend-code-quality.md 13 KB
- references/backend-debugging.md 18 KB
- references/backend-devops.md 10 KB
- references/backend-mindset.md 11 KB
- references/backend-performance.md 9.4 KB
- references/backend-security.md 7.9 KB
- references/backend-technologies.md 7.5 KB
- references/backend-testing.md 10 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.
- 4d ago First seen · 96 lines · 135 tokens per session scan A 68e7dbc0221c
backend-development is a skill published in the GitHub repository duongductrong/cursor-kit (22 stars, last pushed 5mo ago), licensed MIT. It adds 135 tokens to every session and 1,039 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 0 findings. It is 86% identical to ck:backend-development, differing in 5 lines, and is treated as a copy.
Other skills, from other repositories
clean-architecture-testing
Use when it is unclear where a test belongs and what it is allowed to talk to — which test project and layer it goes in, whether it gets a real database, an in-memory fake, or no double at all, and whether a value object or a constructor is worth a test of its own. Also use when layer dependencies must be enforced by…
snowflake-validation
HOW — Read-only Snowflake validation patterns: use repo-documented CLI (snowflake/sql) or SQL checks. Never claim success without working credentials and evidence.
cloudbase-document-database-in-wechat-miniprogram
Use CloudBase document database WeChat MiniProgram SDK to query, create, update, and delete data. Supports complex queries, pagination, aggregation, and geolocation queries.
cloudbase-cli
CloudBase CLI (tcb, 云开发CLI, Tencent CloudBase命令行) resource management skill. Use when deploying cloud functions, CloudRun, storage, NoSQL/MySQL, static hosting, permissions, CORS/domains via tcb; for CI/CD and batch ops; when the user prefers CLI; or as the first-session fallback when CloudBase MCP tools are not…
cloudbase-sites
Use when the user wants to vibe-code a full-stack web app inside DeepSeek Harness — scaffold from CloudBase templates, local Vite preview, PostgreSQL tables, and one-click static hosting deploy with a real domain.
mongodb-schema-design
MongoDB schema design patterns and anti-patterns. Use when designing data models, reviewing schemas, migrating from SQL, or troubleshooting performance issues caused by schema problems. Triggers on "design schema", "embed vs reference", "MongoDB data model", "schema review", "unbounded arrays", "one-to-many", "tree…