Maui Authentication

What it does

When your agent uses it

• : add authentication
• WebAuthenticator
• Google login MAUI
• Apple login MAUI

Example prompts

• “add authentication”
• “OAuth login”
• “MSAL.NET”
• “/maui-authentication”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

1. 1App calls WebAuthenticator pointing to your server endpoint
2. 2Server initiates the OAuth flow with the identity provider (holds the client secret)
3. 3Provider redirects back to your server with an auth code
4. 4Server exchanges the code for tokens and returns them to the app via the callback URI

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).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • github.com

  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 Authentication loads about 1.5k tokens when it runs, and up to ~5.8k if it reads all its reference files. Until then it costs about 195 tokens; SKILL.md has 511 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~195

When it runs · the whole SKILL.md, loaded when a task matches

~1.5k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~5.8k

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

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). 511 words, ~1,499 tokens.

name

maui-authentication

description

Add authentication to .NET MAUI apps. Covers WebAuthenticator for generic OAuth 2.0 / social login, and MSAL.NET for Microsoft Entra ID (Azure AD) with broker support (Microsoft Authenticator), token caching, Conditional Access, platform-specific setup (Android, iOS, Windows), DelegatingHandler for bearer token API calls, and Blazor Hybrid integration. USE FOR: "add authentication", "OAuth login", "MSAL.NET", "social login", "WebAuthenticator", "Entra ID MAUI", "Azure AD login", "Google login MAUI", "Apple login MAUI", "token caching", "bearer token", "sign in". DO NOT USE FOR: secure local storage of tokens (use maui-secure-storage), Aspire-specific auth setup (use maui-aspire), or server-side Entra ID provisioning (use entra-id-aspire-provisioning).

// ❌ Ignoring MsalUiRequiredException — user gets a crash
var result = await _pca.AcquireTokenSilent(scopes, account).ExecuteAsync(ct);

// ✅ Fall back to interactive when silent fails
try
{
    result = await _pca.AcquireTokenSilent(scopes, account).ExecuteAsync(ct);
}
catch (MsalUiRequiredException)
{
    result = await _pca.AcquireTokenInteractive(scopes).ExecuteAsync(ct);
}

// ✅ Don't treat cancellation as an error
catch (MsalClientException ex) when (ex.ErrorCode == "authentication_canceled")
{
    return null;  // User cancelled — not an error
}

© davidortinau, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

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

• SKILL.md
• references/authentication-api.md

Open the folder on GitHubat commit 79bb4bf