How do I install the Local Authentication skill?

Run npx skillmds@latest add caglarbaranbora/local-authentication in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Local Authentication safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Local Authentication?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Local Authentication free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Local Authentication?

caglarbaranbora (@caglarbaranbora) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Local Authentication by caglarbaranbora

Name: Local Authentication
Author: caglarbaranbora

Local Authentication

Route Face ID/Touch ID/device-passcode implementation tasks to the correct Knowledge Contracts -- availability and biometry-type detection, policy evaluation, reason strings and Info.plist, error handling, LAContext lifecycle, Keychain-biometric binding, and fallback UX. Use when checking biometric availability, calling evaluatePolicy, writing an NSFaceIDUsageDescription string, handling an LAError, managing LAContext lifetime, binding a Keychain item to biometrics via SecAccessControl, or deciding on a passcode fallback. v1 is iOS/iPadOS LocalAuthentication framework API only -- no macOS/watchOS-specific behavior, no general Keychain storage (SecItemAdd/Copy/Update for non-biometric-bound items). Triggers on Face ID, Touch ID, LAContext, LABiometryType, canEvaluatePolicy, evaluatePolicy, deviceOwnerAuthentication, deviceOwnerAuthenticationWithBiometrics, LAPolicy, LAError, biometryNotEnrolled, biometryLockout, NSFaceIDUsageDescription, localizedReason, localizedFallbackTitle, SecAccessControl, biometryCurren

File contents

Local Authentication — Foundations Skill

Purpose

Route Face ID/Touch ID/device-passcode implementation tasks to the minimum required Local Authentication Knowledge Contracts. v1 scope is the iOS/iPadOS LocalAuthentication framework API plus the Keychain-biometric binding seam — no macOS/watchOS-specific behavior, no general Keychain storage.

Routing

Load only the contracts relevant to the task. All paths relative to knowledge/local-authentication/.

Checking availability or biometry type -> availability-and-biometry-type.md
Calling evaluatePolicy / choosing a policy -> policy-evaluation.md
Writing localizedReason or NSFaceIDUsageDescription -> reason-strings-and-info-plist.md
Handling an LAError -> error-handling.md
Managing LAContext lifetime or re-enrollment detection -> context-lifecycle.md
Binding a Keychain item to biometrics -> keychain-biometric-binding.md
Deciding on or configuring a passcode fallback -> fallback-ux-and-passcode.md

Never load more than the contracts relevant to the specific question.

Stop Conditions

Stop and report if the requested topic has no matching Knowledge Contract in knowledge/local-authentication/ — do not guess or fall back to general knowledge.

macOS/watchOS-specific LocalAuthentication behavior — Deferred
General Keychain storage (SecItemAdd/SecItemCopyMatching/ SecItemUpdate for non-biometric-bound items) — owned by security

---name: local-authenticationdescription: Route Face ID/Touch ID/device-passcode implementation tasks to the correct Knowledge Contracts -- availability and biometry-type detection, policy evaluation, reason strings and Info.plist, error handling, LAContext lifecycle, Keychain-biometric binding, and fallback UX. Use when checking biometric availability, calling evaluatePolicy, writing an NSFaceIDUsageDescription string, handling an LAError, managing LAContext lifetime, binding a Keychain item to biometrics via SecAccessControl, or deciding on a passcode fallback. v1 is iOS/iPadOS LocalAuthentication framework API only -- no macOS/watchOS-specific behavior, no general Keychain storage (SecItemAdd/Copy/Update for non-biometric-bound items). Triggers on Face ID, Touch ID, LAContext, LABiometryType, canEvaluatePolicy, evaluatePolicy, deviceOwnerAuthentication, deviceOwnerAuthenticationWithBiometrics, LAPolicy, LAError, biometryNotEnrolled, biometryLockout, NSFaceIDUsageDescription, localizedReason, localizedFallbackTitle, SecAccessControl, biometryCurren---# Local Authentication — Foundations Skill## PurposeRoute Face ID/Touch ID/device-passcode implementation tasks to theminimum required Local Authentication Knowledge Contracts. v1 scope isthe iOS/iPadOS LocalAuthentication framework API plus theKeychain-biometric binding seam — no macOS/watchOS-specific behavior, nogeneral Keychain storage.## RoutingLoad only the contracts relevant to the task. All paths relative toknowledge/local-authentication/.- Checking availability or biometry type -> availability-and-biometry-type.md- Calling evaluatePolicy / choosing a policy -> policy-evaluation.md- Writing localizedReason or NSFaceIDUsageDescription -> reason-strings-and-info-plist.md- Handling an LAError -> error-handling.md- Managing LAContext lifetime or re-enrollment detection -> context-lifecycle.md- Binding a Keychain item to biometrics -> keychain-biometric-binding.md- Deciding on or configuring a passcode fallback -> fallback-ux-and-passcode.mdNever load more than the contracts relevant to the specific question.## Stop ConditionsStop and report if the requested topic has no matching KnowledgeContract in knowledge/local-authentication/ — do not guess or fall backto general knowledge.- macOS/watchOS-specific LocalAuthentication behavior — Deferred- General Keychain storage (`SecItemAdd`/`SecItemCopyMatching`/ `SecItemUpdate` for non-biometric-bound items) — owned by `security`

Frequently asked questions