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Create a Blazor Web App · dotnet | DecimalAI

frontendby dotnet

Create a Blazor Web App

dotnet/create-blazor-project

Source dotnet/skills ↗License MIT

Create a new ASP.NET Core web application or web site using Blazor. USE FOR: creating a new Blazor web app, scaffolding a new web project, starting a new web site, choosing render modes (Static SSR, Interactive Server, Interactive WebAssembly, Auto), running dotnet new blazor with the right options, setting up initial project structure. DO NOT USE FOR: adding features to existing projects, changing how an existing app renders, or component authoring (use author-component).

SkillScore83Maintained

Automatic

Frontend / UI pack

Last verified 8/9/2026

What it changes

Passed 19 of 23 test cases with the skill, and 11 of 23 without it.

Without skill48%

With skill83%

Checks it passed that the model alone missed

-au Individual
assets/agents-md/auto-global.md
dotnet new blazor -o OrderHub -int Server

and 11 more in the full report

8 fixed11 passed either way4 still failing0 broke

Pass-rate lift: +35 pp
Tokens: +109%
Agent turns: 0%
Response time: -54%

Model gemini-3.6-flashMeasured 8/9/2026v119 of 23 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/dotnet-create-blazor-project/SKILL.md https://app.decimal.ai/s/dotnet-create-blazor-project/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add dotnet-create-blazor-project, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/dotnet-create-blazor-project/ and pins it in .decimal/skills.lock

decimalai skills add dotnet-create-blazor-project

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/dotnet-create-blazor-project/SKILL.md https://app.decimal.ai/s/dotnet-create-blazor-project/SKILL.md

Raw file: /s/dotnet-create-blazor-project/SKILL.md ↗ · machine-readable summary at /s/dotnet-create-blazor-project.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 8

Prompt

We scaffolded a Blazor application named 'SmartDash' using -int Auto -ai. We need to populate the project root AGENTS.md documentation file. Which template file from assets/agents-md/ should be copied, and where should AGENTS.md be placed in the project hierarchy?

What was checked, without and with the skill
Checked	Without skill	With skill
assets/agents-md/auto-global.md	Missed	Passed
places AGENTS.md in the root of the server project rather than inside the .Client project	Missed	Passed

case-08 · gemini-3.6-flash · 8/9/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md280 linessingle file

Create a Blazor Web App

Before You Start — Gather Requirements

If the user's request doesn't make the following clear, ask before scaffolding:

What does the app do? List the main screens/features (e.g., "product catalog with search and shopping cart").
What kind of interactivity is needed? Displaying data and forms? Real-time updates? Offline support? Rich drag-and-drop UI?
Deployment environment? Internet-facing? Intranet? Mobile users on slow connections?
Authentication needed? Anonymous? Individual accounts? Organizational (Azure AD)?

Pick the Right Interactivity Level

Blazor render modes are a progression scale. Start at the simplest level that satisfies the requirements and only move up when there's a concrete reason.

Static SSR ──→ SSR + Enhanced Nav ──→ Interactive Server ──→ Interactive WebAssembly
 simplest                                                           most complex

Decision Rules

If the app needs...	Use	Why
Display data, simple forms, links between pages	Static SSR (`-int None`)	No JS runtime, no circuit, no WebAssembly download. Forms work via HTML POST. Enhanced navigation makes it feel snappy.
Everything above + a few components with client-side behavior (live search, real-time updates, complex form wizards)	Interactive Server, per-page (`-int Server`)	Only the components that need interactivity opt in with `@rendermode`. The rest stays static. Server-side execution, full .NET access, no API layer needed.
Most pages need rich interactivity (dashboards, drag-and-drop, chat)	Interactive Server, global (`-int Server -ai`)	Every component is interactive by default. Consistent UX, simpler mental model. Trade-off: every user holds a SignalR circuit on the server.
Network latency is a problem, users are on mobile/poor connections, or the app must work offline	Interactive WebAssembly (`-int WebAssembly`)	Code runs in the browser. Eliminates round-trip latency but requires a `.Client` project, API layer for data access, and downloads the .NET runtime to the browser on first visit. For offline support, enable PWA: add a service worker and manifest after scaffolding (not included in the template by default).
Fast initial load (Server) + low latency after (WebAssembly)	Interactive Auto (`-int Auto`)	First visit uses Server; subsequent visits use cached WebAssembly runtime. Most complex setup — see Auto constraints below. Only choose when both Server and WebAssembly constraints apply.

Default recommendation: Start with -int Server (per-page). It covers the vast majority of apps. Upgrade to global or WebAssembly only when a specific requirement demands it.

Auto Mode Constraints

Auto mode means your component code runs on the server first, then in the browser on subsequent visits. This creates real constraints:

All interactive components must live in the .Client project — same as WebAssembly.
No direct server access from interactive components — no EF DbContext, no file system, no server-only services. All data access must go through HTTP APIs.
Both Program.cs files must register matching services — the server and client DI containers must both provide implementations for any service an interactive component injects.
Code must not assume its execution environment — no HttpContext access, no browser-only APIs without RendererInfo guards.

Track record

Benchmark

19 / 23

test cases passed, vs 11 / 23 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

dotnet / skills

plugins/dotnet-blazor/skills/create-blazor-project/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Create a Blazor Web App

Before You Start — Gather Requirements

Pick the Right Interactivity Level

Decision Rules

Auto Mode Constraints

Track record

Benchmark

Adoption

SkillSafety

Source

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