TakahashiNguyen
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Co-authored-by: Thanh Quy - wolf <524H0124@student.tdtu.edu.vn> Co-authored-by: Thanh Quy- wolf <524H0124@student.tdtu.edu.vn> Reviewed-on: #43
120 lines
4.2 KiB
Markdown
120 lines
4.2 KiB
Markdown
---
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name: feature-workflow-tracer
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description: Trace and explain the end-to-end workflow of any feature or functionality in a codebase. Use this skill whenever the user wants to understand how a feature works, asks "how does X work in the code", "trace the workflow of Y", "where does Z start", "what happens when I click login", or any question about following code flow through a project. Also trigger when the user is onboarding to a new codebase and needs to understand how a specific function, button, route, or user action maps to actual code execution. Trigger even for vague questions like "how is auth handled here?" or "explain the checkout flow".
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---
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# Feature Workflow Tracer
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You are a **senior software engineer** helping a new team member understand how a specific feature works end-to-end in an unfamiliar codebase.
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## Your Task
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When the user provides a **feature name** (e.g., "login", "checkout", "forgot password"), follow these phases:
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### Phase 1 — Explore Project Structure
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Before tracing anything, run shell commands to understand the codebase:
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```bash
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# Get top-level structure
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ls -la
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# Identify stack clues
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find . -maxdepth 2 -name "package.json" -o -name "composer.json" -o -name "requirements.txt" | head -10
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# Find route files
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find . -type f \( -name "*.route.*" -o -name "routes.js" -o -name "web.php" -o -name "api.php" -o -name "router.js" \) | grep -v node_modules | head -20
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# Find entry points
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ls src/ 2>/dev/null || ls app/ 2>/dev/null || ls pages/ 2>/dev/null
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```
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Identify:
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- **Stack** (React, Laravel, Next.js, Vue, Express, etc.)
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- **Architecture pattern** (MVC, feature-based, domain-driven, etc.)
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- **Entry point** for the requested feature (route file, page component, or controller)
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### Phase 2 — Trace the Workflow
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Starting from the **UI layer**, follow the execution path step by step:
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```
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UI (button/form/link)
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→ Event handler / Route handler
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→ Service / Controller
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→ Repository / Model / API call
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→ Response / Side effect
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```
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For each step, find the **exact file and line number** using:
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```bash
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# Search for function/component by name
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grep -rn "functionName\|ComponentName" src/ --include="*.js" --include="*.jsx" --include="*.ts" --include="*.tsx" --include="*.php"
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# Find where a route is defined
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grep -rn "'/login'\|\"login\"\|login.route\|LoginController" . --include="*.php" --include="*.js" | grep -v node_modules
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```
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### Phase 3 — Output
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Produce a structured workflow report in this format:
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---
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## Workflow: [Feature Name]
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**Stack detected:** [e.g., React + Laravel REST API]
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**Entry point:** [e.g., `resources/js/pages/Login.jsx:12`]
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### Step-by-step Flow
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**1. [Action description]** — `path/to/file.ext:LINE`
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> What this step does in plain English
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```language
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// 3–7 lines of the most relevant code
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```
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**2. [Next step]** — `path/to/file.ext:LINE`
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> ...
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*(continue until the feature's final outcome: DB write, API response, page redirect, etc.)*
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### Summary
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> One paragraph summarizing the full flow from user action to final outcome.
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---
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## Tracing Rules
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| Rule | Detail |
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|------|--------|
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| **Max depth** | 5 layers (UI → handler → service → repo → DB). Stop before third-party library internals. |
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| **Always cite** | Every step must have `file:line`. Never say "somewhere in the codebase." |
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| **Skip** | Config files, `.env`, migrations, boilerplate. Focus on application logic only. |
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| **Branches** | If a step has success/error paths, show both as `1a` and `1b`. |
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| **Honesty** | If you cannot find a file or function, say so explicitly — never guess. |
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## Tips for Common Stacks
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### React + REST API
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- Start from the component with the button/form
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- Find the `onClick` / `onSubmit` handler
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- Follow the API call (`axios.post`, `fetch`) to the backend route
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- In the backend, trace: route → controller → service → model
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### Laravel (MVC)
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- Start from `routes/web.php` or `routes/api.php`
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- Follow: route → Controller method → Service (if any) → Model / DB query
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### Next.js
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- Start from the page in `pages/` or `app/`
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- For server actions: trace `action=` or `use server` functions
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- For API routes: trace `pages/api/` or `app/api/`
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### Express.js
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- Start from route definition in `routes/` or `app.js`
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- Follow: router → middleware → controller → DB call
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