skill CX Codex

authentication · dpearson2699 — Claude Code skill: iOS sign-in and setup

Q: How do I install authentication in Claude Code?

Run `npx skills add dpearson2699/swift-ios-skills --skill authentication -a claude-code`. The skill file is at `~/.claude/skills/authentication/SKILL.md`.

Q: What is required for passkeys?

Configure the relying-party domain with a `webcredentials:` Associated Domain and an AASA entry.

Build iOS sign-in flows with Apple credentials, passkeys, OAuth and biometrics. Useful when an app needs credential-state handling and server-side token checks.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓

npx skills add dpearson2699/swift-ios-skills --skill authentication -a claude-code

Open on GitHub

What authentication does

This skill covers iOS authentication with AuthenticationServices and LocalAuthentication. Its examples address Sign in with Apple, passkeys, OAuth through ASWebAuthenticationSession, Password AutoFill and biometric re-authentication. It also walks through ASAuthorizationController results and checking Apple credential status when the app starts, including what to do after access is revoked.

The server must validate or exchange the identityToken and authorization code; the app should not treat either as proof on its own. Before adding Sign in with Apple, enable the relevant app capability in Xcode. Passkeys have a domain requirement: configure the relying-party domain with the webcredentials: Associated Domain and an AASA entry.

For token checks, the skill describes using Apple’s public keys and validating iss, aud and exp. Client-side checks alone are not enough, so this distinction affects where the authentication boundary belongs.

What it helps with

add Sign in with Apple to an iOS app
handle revoked Apple credentials on app launch
send an identity token for server validation
configure passkey sign-in for an app domain
add biometric re-authentication with LAContext

Example prompts for the agent

Implement Sign in with Apple and handle the ASAuthorizationController result.
Check Apple credential status when the app launches and sign out after revocation.
Set up passkey sign-in for my app domain and explain the Associated Domain requirements.

How to install authentication

1Skills CLI (Vercel)

npx skills add dpearson2699/swift-ios-skills --skill authentication -a claude-code

2Manually: put the files in place

~/.claude/skills/authentication/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/authentication/

1Skills CLI (Vercel)

npx skills add dpearson2699/swift-ios-skills --skill authentication -a codex

2Manually: put the files in place

.agents/skills/authentication/SKILL.md

For all projects use ~/.agents/skills/

1Skills CLI (Vercel)

npx skills add dpearson2699/swift-ios-skills --skill authentication -a cursor

2Manually: put the files in place

.cursor/skills/authentication/SKILL.md

Cursor also reads .agents/skills/ and .claude/skills/

1GitHub CLI

gh skill install dpearson2699/swift-ios-skills authentication

2Manually: put the files in place

.github/skills/authentication/SKILL.md

1Skills CLI (Vercel)

npx skills add dpearson2699/swift-ios-skills --skill authentication -a gemini-cli

2Platform CLI

gemini skills install https://github.com/dpearson2699/swift-ios-skills --path skills/authentication

Manually: put the files in place

.devin/skills/authentication/SKILL.md

The legacy .windsurf/skills/ path still works

Skills CLI (Vercel)

npx skills add dpearson2699/swift-ios-skills --skill authentication -a opencode

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

Questions about authentication

How do I install authentication in Claude Code?

Run npx skills add dpearson2699/swift-ios-skills --skill authentication -a claude-code. The skill file is at ~/.claude/skills/authentication/SKILL.md.

What does the authentication skill do?

It guides iOS sign-in work involving Apple credentials, passkeys, OAuth, Password AutoFill and biometrics. It also covers credential status and server-side token handling.

What is required for passkeys?

Configure the relying-party domain with a webcredentials: Associated Domain and an AASA entry.

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