Versioned security assessment

Report ID: SA-18F00D27

1/23/2026, 7:20:25 AM

building-native-ui security assessment v2

Skill Security Certification Report

Audit History
Audit model: claude Historical report
Skill name
building-native-ui
Version
v2
Maintainer
expo
Source
github.com/expo/skills/tree/main/plugins/expo-app-design/skills/building-native-ui/
Coverage
13 Files scanned · 3,329 Lines analyzed
Policy version
Unavailable

Confirmed finding summary

No confirmed security findings

The completed audit recorded no confirmed security findings. This is not proof that the Skill has no side effects.

Installation context

Historical evidence

This report may not describe the currently installable artifact. Open the current Skill page for install guidance.

Open current Skill page

This report does not block or authorize the manifest or ZIP.

All 614 static findings are false positives. This is legitimate Expo documentation containing code examples for building native iOS apps. The scanner incorrectly flagged documentation patterns including CLI command examples (npx expo), CSS color values (rgba), and regex patterns as security issues. No malicious code present.

Report position

Historical report

Open audit history before using this report to install.

Audit attestation

Not attestable

The required immutable binding is incomplete.

Human verification

Not verified

No human verification is recorded for this report.

Coverage

13 Files scanned · 3,329 Lines analyzed

0 items shown for review

Limitations

This report does not claim runtime or sandbox execution and does not prove the absence of side effects.

Evidence chain

Follow the evidence from source binding to the install contract. Available evidence supports verification; it is not a safety guarantee.

  1. Source

    Binding unavailable

  2. Artifact

    Identity incomplete

  3. Audit

    Complete

  4. Install contract

    Open manifest to verify

    Open manifest

Capabilities observed

Observed means this report recorded supporting evidence. Not recorded does not prove that a capability is absent.

Contains scripts

May execute code included with the Skill.

Not recorded by this audit

Network access

May connect to external services.

Observed in 2 evidence locations

Filesystem access

May read or write local files.

Observed in 1 evidence location

Env variables

May read values from the process environment.

Not recorded by this audit

External commands

May invoke commands or programs outside the Skill.

Observed in 3 evidence locations

Risk findings

Confirmed security concerns are separated from items that still need review.

No confirmed security findings were recorded for this completed audit.

Expert evidence

Immutable subject identity, scanner metadata, dismissed matches, and source-level evidence.

Artifact subject

Marketplace commit
Unavailable
Content hash
Unavailable
Tree hash
Unavailable
Skill path
Unavailable
Audit payload hash
Unavailable

Analysis metadata

Audit model: claude

Analysis state: Complete

Scope is limited to the recorded files, lines, methods, and evidence. No runtime or sandbox execution is claimed.

Static false positives ignored (7)
Medium
SKILL.md:30references/animations.md:9-25references/controls.md:9-16references/tabs.md:9-35
Documentation Code Examples Misidentified as Shell Commands
The static scanner flagged 547 instances of 'Ruby/shell backtick execution' in markdown files. These are legitimate code examples showing CLI commands like `npx expo start` and `npx expo run:ios` in documentation. The backticks are markdown code formatting, not shell execution.
Backticks in markdown denote inline code formatting. The content describes Expo CLI commands for development workflows, not shell execution.
Medium
SKILL.md:131SKILL.md:293references/controls.md:130
CSS Color Values Misidentified as Cryptographic Patterns
The scanner flagged 'weak cryptographic algorithm' on CSS color values like `rgba(0, 0, 0, 0.05)` and regex patterns like `match(/\((.*)\)/)`. These are standard CSS and JavaScript patterns for styling and string parsing, not cryptographic operations.
RGBA color values are CSS syntax for transparent colors. The regex extracts route segments for navigation logic, unrelated to cryptography.
Medium
references/storage.md:5-16references/storage.md:23-40
Storage API Documentation Misidentified as Security Risk
The scanner flagged references to AsyncStorage, SecureStore, and SQLite as 'sensitive data access'. These are legitimate Expo storage APIs being documented for app data persistence patterns.
The skill documents Expo's official storage APIs for persistence, a standard requirement for mobile app development.
Medium
SKILL.md:32
Template Injection Heuristic False Positive
The scanner flagged line 32 as 'template injection targeting system prompt'. This line reads: 'Start with Expo Go: Run `npx expo start` and scan the QR code with Expo Go' - pure documentation text.
This is plain text documentation describing the Expo Go development workflow. No template injection mechanism exists.
Medium
SKILL.md:1-315
Heuristic Alert Triggered by Documentation Patterns
Critical heuristic alerts flagged 'dangerous combination: code execution + network + credential access'. These patterns co-occur because the documentation covers complete app development including networking (expo-camera, expo-media-library) and storage (SecureStore) - standard mobile app patterns.
Mobile app development legitimately requires networking, storage, and command-line tooling. Documentation covering these topics triggers pattern-based heuristics incorrectly.
Low
SKILL.md:81
Environment Variable Reference Documentation
Line 81 documents `process.env.EXPO_OS` for platform detection. This is the recommended Expo pattern for environment-aware rendering.
EXPO_OS is an official Expo environment variable. Documenting its use is appropriate for a UI guidelines skill.
Low
references/icons.md:204references/media.md:86
Hardcoded URL References in Documentation
URLs like documentation links and API endpoints appear in the documentation. These are reference examples, not external network calls.
Static documentation URLs are harmless. No network calls are made by the skill itself.

Verify and export

JSON report CITATION.cff SARIF 2.1.0 Signed installation manifest

The manifest and lockfile bind install artifacts to cryptographic hashes. This integrity claim is separate from the security assessment.

Audit attestation: not_attestable