A guide for finding and fixing software bugs through a shortened troubleshooting process. A bug is an error that makes a program behave incorrectly.

Use it when a feature behaves incorrectly or a bug is found in a testing or production environment.

It helps developers move from a reported problem to a correction more quickly.

How zhangloveyan/backend-skill configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to zhangloveyan/backend-skill. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/zhangloveyan/backend-skill/main/.claude/skills/proj-fix/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/zhangloveyan/backend-skill

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/zhangloveyan/backend-skill/proj-fix/github.svg)](https://agentmods.dev/skills/zhangloveyan/backend-skill/proj-fix)

Your own site

<a href="https://agentmods.dev/skills/zhangloveyan/backend-skill/proj-fix"><img src="https://agentmods.dev/badge/skills/zhangloveyan/backend-skill/proj-fix/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/zhangloveyan/backend-skill/proj-fix"><img src="https://agentmods.dev/badge/skills/zhangloveyan/backend-skill/proj-fix.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 29 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 886 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.

Model	Per session	Once invoked
Fable 5.1	$0.00029	$0.00886
Opus 5.5	$0.00012	$0.00354
Sonnet 5.5	$0.00006	$0.00177
Haiku 4.5	$0.00003	$0.00089

Measured 2mo ago against content hash 545296db0194, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

proj-fix 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.

.claude/skills/proj-fix/SKILL.md · 144 lines

What it actually says

Bug修复

触发词

"有个 Bug"
"报错了"
"功能不正常"
"修复一下"

执行流程

Step 0: 校验任务文档 → Step 1: 问题收集 → Step 2: 问题定位 → Step 3: 修复方案 → Step 4: 代码修复 → Step 5: 验证

Step 0: 校验任务文档

确认全流程任务文档存在
若缺失，先创建任务文档骨架并补齐流程状态与上下文快照

Step 1: 问题收集

## Bug 信息

**问题描述：** {用户描述的问题}
**复现步骤：** {如何复现}
**期望行为：** {正确的行为}
**实际行为：** {当前错误的行为}
**错误信息：** {报错日志}

同步更新任务文档（不写细节）：

上下文快照记录“Bug修复中”与一句话问题摘要
流程状态总览标记“业务开发”为进行中

Step 2: 问题定位

常见错误类型：

错误类型	可能原因	排查方向
NullPointerException	空指针	检查对象是否为 null
SQLException	数据库错误	检查 SQL、字段、连接
BusinessException	业务校验失败	检查业务逻辑
参数校验失败	入参不合法	检查 DTO 校验注解
404	接口不存在	检查路径、Controller
500	服务器内部错误	查看详细日志

Step 3: 修复方案

## 修复方案

**修复方式：** {如何修复}
**修改文件：** {需要修改的文件}
**注意事项：** {风险点}

Step 4: 代码修复

修复原则：

最小改动原则 - 只改必要的代码
不要顺手重构 - 专注于修复 Bug
保持代码风格一致

Step 5: 验证

## 验证清单

- [ ] 问题是否已修复
- [ ] 原有功能是否正常
- [ ] 是否引入新问题

同步更新任务文档：

产物清单记录测试/验证结果路径
更新下一步指令

常见修复示例

空指针异常

// 修复前
public UserResponse getDetail(Long id) {
    User user = this.getById(id);
    return convertToResponse(user);  // user 可能为 null
}

// 修复后
public UserResponse getDetail(Long id) {
    User user = this.getById(id);
    if (user == null) {
        throw new BusinessException(ErrorCode.DATA_NOT_EXIST);
    }
    return convertToResponse(user);
}

Git 提交规范

fix: {简要描述问题}

- 问题原因：{原因}
- 修复方式：{方式}

注意事项

先定位后修复 - 不要盲目改代码
最小改动 - 只改必要的部分
充分测试 - 修复后要验证
记录问题 - 重要 Bug 记录到文档
举一反三 - 检查是否有类似问题
任务文档同步 - 全程维护流程状态、产物清单、上下文快照、下一步指令

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.

2mo ago First seen · 144 lines · 29 tokens per session scan A 545296db0194

Subscribe to this mod's changes

proj-fix is a skill published in the GitHub repository zhangloveyan/backend-skill (103 stars, last pushed 23d ago), licensed MIT. It adds 29 tokens to every session and 886 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.

Debugging

proj-fix next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
proj-fixzhangloveyan/backend-skill	Skill	103	23d ago	MIT	A	29	Claude Code
systematic-debuggingopen-metadata/OpenMetadata	Skill	16k	yesterday	Apache-2.0	A	37	Claude Code
log-error-digestzebbern/claude-code-guide	Skill	4.7k	3d ago	MIT	A	71	Claude Code, Codex
cwv-optimizeradobe/skills	Skill	319	yesterday	Apache-2.0	A	112	Claude Code
ci-fixersipyourdrink-ltd/bernstein	Skill	1.2k	yesterday	Apache-2.0	A	15	Claude Code, Codex
incident-response-incident-responsermyndharis/antigravity-skills	Skill	1.9k	23d ago	MIT	A	36	Claude Code
triaging-web-analytics-supportPostHog/posthog	Skill	41k	yesterday	none	A	151	Claude Code, Codex

backend-skill: Skill for Claude Code