Agent skill

Maui Hybridwebview

by davidortinau in davidortinau/maui-skills

Guidance for embedding web content in .NET MAUI apps using HybridWebView, including JavaScript–C interop, bidirectional communication, raw messaging, and trimming/NativeAOT considerations.

MITAuto-check passedMobile

Install Maui Hybridwebview

skills CLI

$ npx skills add davidortinau/maui-skills --skill maui-hybridwebview -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install davidortinau/maui-skills maui-hybridwebview --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/davidortinau/maui-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/maui-skills/skills/maui-hybridwebview .claude/skills/maui-hybridwebview && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "maui-hybridwebview" agent skill from https://github.com/davidortinau/maui-skills/tree/main/plugins/maui-skills/skills/maui-hybridwebview into .claude/skills/maui-hybridwebview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "maui-hybridwebview", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/davidortinau/maui-skills/tree/main/plugins/maui-skills/skills/maui-hybridwebview

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add davidortinau/maui-skills --skill maui-hybridwebview -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install davidortinau/maui-skills maui-hybridwebview --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/davidortinau/maui-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/maui-skills/skills/maui-hybridwebview .agents/skills/maui-hybridwebview && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "maui-hybridwebview" agent skill from https://github.com/davidortinau/maui-skills/tree/main/plugins/maui-skills/skills/maui-hybridwebview into .agents/skills/maui-hybridwebview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "maui-hybridwebview", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add davidortinau/maui-skills --skill maui-hybridwebview -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install davidortinau/maui-skills maui-hybridwebview --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/davidortinau/maui-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/maui-skills/skills/maui-hybridwebview .cursor/skills/maui-hybridwebview && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "maui-hybridwebview" agent skill from https://github.com/davidortinau/maui-skills/tree/main/plugins/maui-skills/skills/maui-hybridwebview into .cursor/skills/maui-hybridwebview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "maui-hybridwebview", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/davidortinau/maui-skills.git --path plugins/maui-skills/skills/maui-hybridwebview

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add davidortinau/maui-skills --skill maui-hybridwebview -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install davidortinau/maui-skills maui-hybridwebview --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/davidortinau/maui-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/maui-skills/skills/maui-hybridwebview .gemini/skills/maui-hybridwebview && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "maui-hybridwebview" agent skill from https://github.com/davidortinau/maui-skills/tree/main/plugins/maui-skills/skills/maui-hybridwebview into .gemini/skills/maui-hybridwebview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "maui-hybridwebview", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install davidortinau/maui-skills maui-hybridwebview

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add davidortinau/maui-skills --skill maui-hybridwebview -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/davidortinau/maui-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/maui-skills/skills/maui-hybridwebview .github/skills/maui-hybridwebview && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "maui-hybridwebview" agent skill from https://github.com/davidortinau/maui-skills/tree/main/plugins/maui-skills/skills/maui-hybridwebview into .github/skills/maui-hybridwebview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "maui-hybridwebview", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add davidortinau/maui-skills --skill maui-hybridwebview -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install davidortinau/maui-skills maui-hybridwebview --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/davidortinau/maui-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/maui-skills/skills/maui-hybridwebview .opencode/skills/maui-hybridwebview && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "maui-hybridwebview" agent skill from https://github.com/davidortinau/maui-skills/tree/main/plugins/maui-skills/skills/maui-hybridwebview into .opencode/skills/maui-hybridwebview/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "maui-hybridwebview", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: maui-hybridwebview
GitHub stars: 175
Token cost: ~1.2k tokens
SKILL.md length: 328 words
Files: 2 (incl. references)
Skills in repo: 41
Repo updated: Jul 6, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Guidance for embedding web content in .NET MAUI apps using HybridWebView, including JavaScript–C interop, bidirectional communication, raw messaging, and trimming/NativeAOT considerations.

: HybridWebView
SKILL.md covers Common gotchas, ⚠️ Bridge script is mandatory, JSON serialization — every… and SetInvokeJavaScriptTarget —…, plus 4 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
JavaScript interop

What it does

Maui Hybridwebview is an agent skill from davidortinau/maui-skills. Guidance for embedding web content in .NET MAUI apps using HybridWebView, including JavaScript–C interop, bidirectional communication, raw messaging, and trimming/NativeAOT considerations. USE FOR: "HybridWebView", "JavaScript interop", "embed web content", "JS to C interop", "C to JavaScript", "web view interop", "raw message", "InvokeJavaScriptAsync", "web content MAUI". DO NOT USE FOR: deep linking from external URLs (use maui-deep-linking), REST API calls (use maui-rest-api), or Blazor Hybrid apps (different…

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/hybridwebview-api.md`).

It sits in Mobile, covering Cross-platform mobile apps. It works with C#, JavaScript and Blazor. The repository describes itself as: .NET MAUI skills for GitHub Copilot and Claude Code. The licence is MIT.

When your agent uses it

: HybridWebView
JavaScript interop
Embed web content
JS to C interop

Example prompts

“HybridWebView”
“JavaScript interop”
“embed web content”
“/maui-hybridwebview”

What it can do on your machine

Read from SKILL.md and the folder at commit 79bb4bf. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are csharp, html and xml).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Maui Hybridwebview loads about 1.2k tokens when it runs, and up to ~2.3k if it reads all its reference files. Until then it costs about 140 tokens; SKILL.md has 328 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~140
When it runs · the whole SKILL.md, loaded when a task matches: ~1.2k
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~2.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from davidortinau/maui-skills at commit 79bb4bf, republished under its MIT licence (© davidortinau). 328 words, ~1,239 tokens.

Download SKILL.mdSave it as .claude/skills/maui-hybridwebview/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.

name: maui-hybridwebview
description: Guidance for embedding web content in .NET MAUI apps using HybridWebView, including JavaScript–C# interop, bidirectional communication, raw messaging, and trimming/NativeAOT considerations. USE FOR: "HybridWebView", "JavaScript interop", "embed web content", "JS to C# interop", "C# to JavaScript", "web view interop", "raw message", "InvokeJavaScriptAsync", "web content MAUI". DO NOT USE FOR: deep linking from external URLs (use maui-deep-linking), REST API calls (use maui-rest-api), or Blazor Hybrid apps (different from HybridWebView).

HybridWebView in .NET MAUI

HybridWebView hosts HTML/JS/CSS content inside a .NET MAUI app with bidirectional C#↔JS communication. It is not a general browser control — it is designed for local web content shipped with the app.

Common gotchas

Issue	Fix
Blank white screen	Web assets missing from `Resources/Raw/wwwroot` or `DefaultFile` not set
JS interop silently fails	Missing `<script src="_hwv/HybridWebView.js"></script>` in HTML
`InvokeJavaScriptAsync` returns null	Return type missing `[JsonSerializable]` attribute in `JsonSerializerContext`
JS → C# calls do nothing	`SetInvokeJavaScriptTarget` not called before JS invokes C# methods
Serialization crash with trimming	Not using source-generated `JsonSerializerContext`

⚠️ Bridge script is mandatory

The HTML page must include the bridge script before any app scripts:

html

<!-- ✅ Correct order -->
<script src="_hwv/HybridWebView.js"></script>
<script src="scripts/app.js"></script>

<!-- ❌ Wrong — app.js loads before bridge, interop calls fail silently -->
<script src="scripts/app.js"></script>
<script src="_hwv/HybridWebView.js"></script>

JSON serialization — every type must be registered

Every parameter type and return type used in InvokeJavaScriptAsync must have a [JsonSerializable] entry:

csharp

// ✅ Correct — all interop types registered
[JsonSerializable(typeof(int))]
[JsonSerializable(typeof(string))]
[JsonSerializable(typeof(Person))]
internal partial class MyJsonContext : JsonSerializerContext { }

// ❌ Wrong — adding a new type to interop without registering it
// This causes silent null returns or runtime exceptions

Rule: When you add a new type to the interop surface, you must add a [JsonSerializable(typeof(T))] attribute to the context. Forgetting this is the #1 cause of mysterious interop failures.

SetInvokeJavaScriptTarget — timing matters

csharp

// ✅ Set target BEFORE the web page loads and JS calls C#
myHybridWebView.SetInvokeJavaScriptTarget(new MyJsBridge());

// ❌ Setting it after JS already tried to call — calls are lost

⚠️ Call SetInvokeJavaScriptTarget during page construction or OnAppearing, not lazily.

Exception handling (.NET 9+)

JS exceptions thrown during InvokeJavaScriptAsync are forwarded to .NET. Always wrap interop calls:

csharp

// ✅ Catches JS errors
try
{
    var result = await myHybridWebView.InvokeJavaScriptAsync<string>(
        "riskyFunction", MyJsonContext.Default.String);
}
catch (Exception ex)
{
    Debug.WriteLine($"JS error: {ex.Message}");
}

// ❌ Unhandled JS exception crashes the interop pipeline
var result = await myHybridWebView.InvokeJavaScriptAsync<string>(
    "riskyFunction", MyJsonContext.Default.String);

Trimming / NativeAOT pitfalls

Trimming is disabled by default in MAUI projects. If you enable it:

⚠️ You must use source-generated JsonSerializerContext (not reflection-based serialization)
⚠️ Set JsonSerializerIsReflectionEnabledByDefault to false
Using JsonSerializerContext as shown above is recommended regardless of trimming settings

xml

<PropertyGroup>
  <PublishTrimmed>true</PublishTrimmed>
  <JsonSerializerIsReflectionEnabledByDefault>false</JsonSerializerIsReflectionEnabledByDefault>
</PropertyGroup>

Decision framework — typed interop vs raw messages

Need	Use
Structured data exchange with type safety	`InvokeJavaScriptAsync` / `InvokeDotNet` with `JsonSerializerContext`
Simple string payloads, fire-and-forget	`SendRawMessage` / `RawMessageReceived`
Calling C# from JS with return values	`InvokeDotNet` (target must be set first)
Multiple JS functions to call	Typed interop — one `InvokeJavaScriptAsync` per function

Quick checklist

Web content is under Resources/Raw/wwwroot
index.html includes <script src="_hwv/HybridWebView.js"></script> before app scripts
DefaultFile is set (or defaults to index.html)
Every interop type has a [JsonSerializable] entry in a JsonSerializerContext
SetInvokeJavaScriptTarget is called before JS invokes C# methods
InvokeJavaScriptAsync calls are wrapped in try/catch (.NET 9+)
If trimming enabled: source-generated JSON serialization configured

Files

SKILL.md and 1 other file (references) in plugins/maui-skills/skills/maui-hybridwebview of davidortinau/maui-skills.

SKILL.md
references/hybridwebview-api.md

Open the folder on GitHubat commit 79bb4bf

Compare with similar skills

Maui Hybridwebview next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Maui Hybridwebview compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Maui Hybridwebview this skilldavidortinau/maui-skills	175	—	~1.2k	Automated safety check: Pass	MIT	3 mo ago
Maui Safe Areadotnet/skills	5.6k	1 repos	~3.2k	Automated safety check: Pass	MIT	yesterday
Wallet QuickstartNethereum/Nethereum	2.3k	—	~1.6k	Automated safety check: Pass	MIT	6 days ago
Csharp Expertmicrosoft/testfx	1k	2 repos	~5.4k	Automated safety check: Pass	MIT	yesterday
Sentry Dotnet SDKgetsentry/sentry-for-ai	268	—	~5.8k	Automated safety check: Pass	Apache-2.0	yesterday
Using Dotnetnovotnyllc/dotnet-artisan	232	—	~2.3k	Automated safety check: Warn	MIT	3 days ago

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Works with

Questions about Maui Hybridwebview

What does Maui Hybridwebview do?

Guidance for embedding web content in .NET MAUI apps using HybridWebView, including JavaScript–C interop, bidirectional communication, raw messaging, and trimming/NativeAOT considerations. Maui Hybridwebview is an agent skill from davidortinau/maui-skills.NET MAUI apps using HybridWebView, including JavaScript–C interop, bidirectional communication, raw messaging, and trimming/NativeAOT considerations.

When should I use Maui Hybridwebview?

Maui Hybridwebview fits situations like: : HybridWebView; javaScript interop; embed web content; JS to C interop.

How do I install Maui Hybridwebview in Claude Code?

Run `npx skills add davidortinau/maui-skills --skill maui-hybridwebview -a claude-code`. Or copy the skill folder (plugins/maui-skills/skills/maui-hybridwebview in davidortinau/maui-skills) into .claude/skills/maui-hybridwebview in your project. Claude Code loads it when a task matches its description.

How do I install Maui Hybridwebview in Codex?

Run `npx skills add davidortinau/maui-skills --skill maui-hybridwebview -a codex`. Or copy the skill folder (plugins/maui-skills/skills/maui-hybridwebview in davidortinau/maui-skills) into .agents/skills/maui-hybridwebview in your project. Codex loads it when a task matches its description.

Can I use Maui Hybridwebview in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add davidortinau/maui-skills --skill maui-hybridwebview -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/maui-hybridwebview, .gemini/skills/maui-hybridwebview, .github/skills/maui-hybridwebview and .opencode/skills/maui-hybridwebview in your project.

What does Maui Hybridwebview need to run?

SKILL.md names no scripts, command-line tools or credentials: Maui Hybridwebview is instructions for the agent only.

Does Maui Hybridwebview access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Maui Hybridwebview safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Maui Hybridwebview use?

Maui Hybridwebview is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Maui Hybridwebview use?

About 1.2k tokens (SKILL.md is roughly 5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.1k tokens, read only when the agent opens those files.

What are the alternatives to Maui Hybridwebview?

Skills that share tags, products or a category with Maui Hybridwebview: Maui Safe Area (dotnet/skills, 5.6k stars), Wallet Quickstart (Nethereum/Nethereum, 2.3k stars), Csharp Expert (microsoft/testfx, 1k stars) and Sentry Dotnet SDK (getsentry/sentry-for-ai, 268 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Maui Hybridwebview?

davidortinau (a GitHub user) maintains it in davidortinau/maui-skills, which has 175 GitHub stars. The repository holds 41 skills in this directory. The repository was last updated on July 6, 2026.

Source: davidortinau/maui-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Maui Hybridwebview

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

HybridWebView in .NET MAUI

Common gotchas

⚠️ Bridge script is mandatory

JSON serialization — every type must be registered

SetInvokeJavaScriptTarget — timing matters

Exception handling (.NET 9+)

Trimming / NativeAOT pitfalls

Decision framework — typed interop vs raw messages

Quick checklist

Files

Compare with similar skills

Similar skills

More from davidortinau/maui-skills

Related

Questions about Maui Hybridwebview