backend-dev

backend-dev is a skill for Codex from SourceLin/sourcelin-cloud-blog. It costs 32 tokens per session (596 once invoked), scanned A, original, MIT.

A guide for building and changing the server-side parts of the Sourcelin application, including web endpoints, business logic, database access, data objects, and service interfaces.

In plain words
What is it for?
Use it when adding or modifying REST endpoints, services, database queries, data-transfer objects, error handling, shared code, or microservice interfaces.
Why use it?
Backend changes must follow the application's layer boundaries and API rules so that modules continue to work together. The guide also specifies which checks to run after changes.

Skill for Codex

Written for Codex: agents/openai.yaml present. Also seen: mentions AGENTS.md.

Good fit Use it when adding or modifying REST endpoints, services, database queries, data-transfer objects, error handling, shared code, or microservice interfaces.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/sourcelin/sourcelin-cloud-blog/backend-dev
Install

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.

Any agent
npx skills add SourceLin/sourcelin-cloud-blog --skill backend-dev
Clone the repo
git clone --depth 1 https://github.com/SourceLin/sourcelin-cloud-blog

Made for: Codex.

Wrote 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.

agentmods badge for backend-dev

README.md
[![agentmods](https://agentmods.dev/badge/skills/sourcelin/sourcelin-cloud-blog/backend-dev/github.svg)](https://agentmods.dev/skills/sourcelin/sourcelin-cloud-blog/backend-dev)
Your own site
<a href="https://agentmods.dev/skills/sourcelin/sourcelin-cloud-blog/backend-dev"><img src="https://agentmods.dev/badge/skills/sourcelin/sourcelin-cloud-blog/backend-dev/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.

agentmods 80×15 button for backend-dev

Your own site · 80×15
<a href="https://agentmods.dev/skills/sourcelin/sourcelin-cloud-blog/backend-dev"><img src="https://agentmods.dev/badge/skills/sourcelin/sourcelin-cloud-blog/backend-dev.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 32 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 596 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00032 $0.00596
Opus 5.5 $0.00013 $0.00238
Sonnet 5.5 $0.00006 $0.00119
Haiku 4.5 $0.00003 $0.00060

Measured 2mo ago against content hash 2fa4a616cd24, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

backend-dev 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 2mo 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.

skills/backend-dev/SKILL.md · 50 lines

What it actually says

后端开发技能

使用场景

  • 修改 sourcelin-gateway、sourcelin-auth、sourcelin-modules/*、sourcelin-common/*、sourcelin-api/*。

  • 新增或改造 REST 接口、业务服务、Mapper XML、DTO/VO。

  • 治理异常处理、公共能力、模块边界或 Feign 协议。

输入

  • 需求说明或待修改接口。

  • 当前 Controller、Service、Mapper、domain 代码。

  • 数据库表结构或 SQL 脚本。

输出

  • 符合后端分层和 API 契约的代码改动。

  • 必要的 DTO/VO、Mapper XML、SQL 或文档同步。

  • 已执行 Maven 验证命令和结果。

执行步骤

  1. 读取 AGENTS.md、rules/backend.md、rules/api-contract.md、rules/coding-conventions.md、rules/testing-and-validation.md。

  2. 定位模块边界:公共能力进 sourcelin-common/*,业务逻辑进 sourcelin-modules/*,Feign 进 sourcelin-api/*。

  3. Controller 只接收参数、校验、权限注解和调用 Service。

  4. Service 实现业务规则、事务、状态流转和 BusinessException。

  5. Mapper XML 放在 src/main/resources/mapper/**,数值条件只判断 != null。

  6. 对外 REST 返回业务对象、ListResult<T>、PageResult<T>、IdResponse 或 Void。

  7. 修改后按影响范围运行 Maven 编译或单测;涉及接口时同时审查 API 契约硬规则。

依赖 rules

  • rules/backend.md

  • rules/api-contract.md

  • rules/coding-conventions.md

  • rules/testing-and-validation.md

禁止行为

  • 禁止对外 Controller 返回 AjaxResult、TableDataInfo、Map<String,Object>、R<T>。

  • 禁止 Controller 手工包装 ApiResponse。

  • 禁止业务代码返回错误字符串或裸 Map。

  • 禁止网关因通用 Web 异常处理依赖 common-security。

  • 禁止把业务逻辑写入 sourcelin-common。

Files

What ships with it

1 file 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.

Changes

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.

  1. 2mo ago First seen · 50 lines · 32 tokens per session scan A 2fa4a616cd24

Subscribe to this mod's changes

backend-dev is a skill published in the GitHub repository SourceLin/sourcelin-cloud-blog (11 stars, last pushed 4mo ago), licensed MIT. It adds 32 tokens to every session and 596 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-08-30.

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