Agent Skills › junhoyeo/contrabass › gitnexus-impact-analysis

gitnexus-impact-analysis

GitHub

用于代码变更前的安全影响分析，评估修改特定代码可能引发的破坏范围。通过上游依赖查找、执行流检查及风险分级，帮助用户判断变更安全性并预防意外故障。

.claude/skills/gitnexus/gitnexus-impact-analysis/SKILL.md junhoyeo/contrabass

Trigger Scenarios

询问修改某功能是否安全想知道修改X会导致什么后果查看代码的爆炸半径提交前进行影响评估

Install

npx skills add junhoyeo/contrabass --skill gitnexus-impact-analysis -g -y

More Options

Non-standard path

npx skills add https://github.com/junhoyeo/contrabass/tree/main/.claude/skills/gitnexus/gitnexus-impact-analysis -g -y

Use without installing

npx skills use junhoyeo/contrabass@gitnexus-impact-analysis

指定 Agent (Claude Code)

npx skills add junhoyeo/contrabass --skill gitnexus-impact-analysis -a claude-code -g -y

安装 repo 全部 skill

npx skills add junhoyeo/contrabass --all -g -y

预览 repo 内 skill

npx skills add junhoyeo/contrabass --list

SKILL.md

Frontmatter

{
    "name": "gitnexus-impact-analysis",
    "description": "Use when the user wants to know what will break if they change something, or needs safety analysis before editing code. Examples: \"Is it safe to change X?\", \"What depends on this?\", \"What will break?\""
}

Impact Analysis with GitNexus

When to Use

"Is it safe to change this function?"
"What will break if I modify X?"
"Show me the blast radius"
"Who uses this code?"
Before making non-trivial code changes
Before committing — to understand what your changes affect

Workflow

1. gitnexus_impact({target: "X", direction: "upstream"})  → What depends on this
2. READ gitnexus://repo/{name}/processes                   → Check affected execution flows
3. gitnexus_detect_changes()                               → Map current git changes to affected flows
4. Assess risk and report to user

If "Index is stale" → run npx gitnexus analyze in terminal.

Checklist

- [ ] gitnexus_impact({target, direction: "upstream"}) to find dependents
- [ ] Review d=1 items first (these WILL BREAK)
- [ ] Check high-confidence (>0.8) dependencies
- [ ] READ processes to check affected execution flows
- [ ] gitnexus_detect_changes() for pre-commit check
- [ ] Assess risk level and report to user

Understanding Output

Depth	Risk Level	Meaning
d=1	WILL BREAK	Direct callers/importers
d=2	LIKELY AFFECTED	Indirect dependencies
d=3	MAY NEED TESTING	Transitive effects

Risk Assessment

Affected	Risk
<5 symbols, few processes	LOW
5-15 symbols, 2-5 processes	MEDIUM
>15 symbols or many processes	HIGH
Critical path (auth, payments)	CRITICAL

Tools

gitnexus_impact — the primary tool for symbol blast radius:

gitnexus_impact({
  target: "validateUser",
  direction: "upstream",
  minConfidence: 0.8,
  maxDepth: 3
})

→ d=1 (WILL BREAK):
  - loginHandler (src/auth/login.ts:42) [CALLS, 100%]
  - apiMiddleware (src/api/middleware.ts:15) [CALLS, 100%]

→ d=2 (LIKELY AFFECTED):
  - authRouter (src/routes/auth.ts:22) [CALLS, 95%]

gitnexus_detect_changes — git-diff based impact analysis:

gitnexus_detect_changes({scope: "staged"})

→ Changed: 5 symbols in 3 files
→ Affected: LoginFlow, TokenRefresh, APIMiddlewarePipeline
→ Risk: MEDIUM

Example: "What breaks if I change validateUser?"

1. gitnexus_impact({target: "validateUser", direction: "upstream"})
   → d=1: loginHandler, apiMiddleware (WILL BREAK)
   → d=2: authRouter, sessionManager (LIKELY AFFECTED)

2. READ gitnexus://repo/my-app/processes
   → LoginFlow and TokenRefresh touch validateUser

3. Risk: 2 direct callers, 2 processes = MEDIUM