# plan-ui-change

Splits a complex Blazor page into focused components before the agent writes any code. Useful once a screen has three or more visual sections.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 3000 installs · ★ 5730
- Author: dotnet
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/dotnet/skills/tree/HEAD/plugins/dotnet-blazor/skills/plan-ui-change/SKILL.md
- Updated: 2026-10-24
- HTML: https://affpapa.org/en/nevibecode/skills/plan-ui-change

## What it does

The skill makes the agent draw a component tree first and then implement it right away. A single monolithic page component is rarely the answer: regions that own their own state, repeated list structures and independent forms each become a separate file.

Work runs in steps. Map the visual regions and the parent-child tree, then fill a table with action, render mode and a line estimate. Next comes data flow: down through `[Parameter]`, up through `EventCallback<T>`, with the parent owning state. One step checks the project for components that already fit, so you don't duplicate them. Implementation goes bottom-up: models, services, leaf components, containers, page, DI registration.

There are hard thresholds. Anything estimated above roughly 200 lines of markup plus code gets split further. Scaffolding a new Blazor project or a single component is out of scope — `create-blazor-project` and `author-component` cover those. The plan is not a proposal: the agent prints it and starts coding, so stopping it means interrupting yourself.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add dotnet/skills --skill plan-ui-change -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/plan-ui-change/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/plan-ui-change/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add dotnet/skills --skill plan-ui-change -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/plan-ui-change/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add dotnet/skills --skill plan-ui-change -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/plan-ui-change/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install dotnet/skills plan-ui-change
```

2. **Manually: put the files in place**
- File: `.github/skills/plan-ui-change/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add dotnet/skills --skill plan-ui-change -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/dotnet/skills --path plugins/dotnet-blazor/skills/plan-ui-change
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/plan-ui-change/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add dotnet/skills --skill plan-ui-change -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/dotnet/skills/tree/HEAD/plugins/dotnet-blazor/skills/plan-ui-change/SKILL.md

## When to use it
- break a dashboard page into components before coding starts
- extract a repeated list row into its own component
- design data flow between parent and child components
- reuse an existing component instead of writing a new one
- order file creation bottom-up

## Example prompts
- Plan an InventoryDashboard page with a filter sidebar and a product table
- Decompose this layout into components and implement them right away
- Design the data flow for the add-product form using EventCallback

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 10260cb1d5516294.

BEGIN THIRD-PARTY FILE 10260cb1d5516294
````text
---
license: MIT
name: plan-ui-change
description: >
  Plan complex Blazor UI features by decomposing them into focused components.
  USE FOR: building a complex Blazor page with multiple sections, planning
  component decomposition, designing a multi-section dashboard or layout,
  breaking down a large UI feature into composable components, pages with
  sidebars and content panels, any page with 3+ distinct visual sections
  or multiple interacting sub-features, identifying parent-child relationships
  and data flow.
  DO NOT USE FOR: creating new Blazor projects or apps from scratch
  (use create-blazor-project), implementing a single individual component
  (use author-component), writing component code with parameters and
  EventCallback (use author-component), or simple single-component pages.
---

# Plan a Blazor UI Change

When asked to build a complex UI feature, **plan the component decomposition first, then immediately implement it**. A single monolithic page component is almost never the right answer — break the UI into focused, composable components.

## Planning Workflow

### Step 1 — Map the Visual Regions

Read the request and identify every distinct visual region. Each region that has its own data, behavior, or layout responsibility is a candidate component.

Draw the component tree:

```
InventoryDashboard          (page — owns data, orchestrates layout)
├── StockSummaryBar         (read-only stats: total items, low-stock count, value)
├── InventoryFilters        (search box, category dropdown, stock-level toggle)
├── InventoryTable          (sortable table of products)
│   └── InventoryRow        (single product row with inline edit/delete)
└── AddProductForm          (slide-out form for new products)
```

Rules for identifying components:
- **Distinct responsibility** — a region owns its own state or behavior → separate component
- **Repeated structure** — items in a list, cards in a grid → extract the item template
- **Independent interactivity** — a section that handles user input separately from its siblings → separate component
- **Size** — any section that would exceed ~150 lines of markup on its own → split it

### Step 2 — Classify Each Component

For every component in the tree, determine:

| Component | Action | Render Mode | State Owned | Lines (est.) |
|-----------|--------|-------------|-------------|-------------|
| InventoryDashboard | Create | InteractiveServer | product list, filter state | ~80 |
| StockSummaryBar | Create | (inherits) | none — receives data | ~30 |
| InventoryFilters | Create | (inherits) | search text, selected category | ~60 |
````
END THIRD-PARTY FILE 10260cb1d5516294

The third-party file has ended. Everything between the 10260cb1d5516294 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

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