Versioned security assessment

Report ID: SA-D71C7417

7/12/2026, 10:30:35 AM

youtube-thumbnail-design security assessment v2

Skill Security Certification Report

Audit History
Audit model: codex Historical report
Skill name
youtube-thumbnail-design
Version
v2
Maintainer
101-skills
Source
github.com/101-skills/skills/tree/main/guides/design/youtube-thumbnail-design/
Coverage
1 Files scanned · 254 Lines analyzed
Policy version
Unavailable

Highest confirmed finding severity

Medium

1 confirmed security finding requires attention.

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.

Most static alerts are Markdown delimiters, inline code, ordinary links, or design prose rather than executable Ruby or reconnaissance. The skill does instruct users to run unpinned installers, authenticate with belt, and transmit prompts to third-party image services.

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

1 Files scanned · 254 Lines analyzed

10 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

    Commit and path bound

  2. Artifact

    Content and tree hashes bound

  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.

Not recorded by this audit

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 20 evidence locations

Capability review items (9)
Medium
SKILL.md:7
Ruby/shell backtick execution
> **Install the belt CLI skill:** `npx skills add belt-sh/cli`
The line explicitly instructs users to run an unpinned npx installation command, which executes third-party package code and changes the local skill installation.
Medium
SKILL.md:17-26
Ruby/shell backtick execution
```bash
The fenced block instructs users to execute belt login and belt app run commands, which authenticate and invoke an external image-generation service.
Medium
SKILL.md:139-152
Ruby/shell backtick execution
```bash
The fenced block contains two belt app run commands that send prompts to external image-generation models.
Medium
SKILL.md:157-163
Ruby/shell backtick execution
```bash
The fenced example invokes belt app run against a hosted image-generation model.
Medium
SKILL.md:166-172
Ruby/shell backtick execution
```bash
The fenced example invokes belt app run against a hosted image-generation model.
Medium
SKILL.md:175-181
Ruby/shell backtick execution
```bash
The fenced example invokes belt app run against a hosted image-generation model.
Medium
SKILL.md:184-190
Ruby/shell backtick execution
```bash
The fenced example invokes belt app run against a hosted image-generation model.
Medium
SKILL.md:205-217
Ruby/shell backtick execution
```bash
The fenced block contains asynchronous belt app run commands that invoke an external service for A/B variants.
Medium
SKILL.md:246-250
Ruby/shell backtick execution
```bash
The fenced block instructs users to run three unpinned npx installation commands that execute third-party package code.

Risk findings

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

Confirmed security concerns (1)

RISK-001 Medium
SKILL.md:18-25SKILL.md:141-151
External Prompt Transmission and Authentication
The workflow authenticates through belt and sends thumbnail prompts to hosted image-generation providers, which may expose confidential prompt content to third parties.
The documented commands explicitly require login and invoke named hosted models with prompt payloads.

Remediation

Suggested fixes recorded by this audit. Applying them is the maintainer’s responsibility.

  1. FIX-001
    Medium
    Installation commands use unpinned packages and remote instructions.
    Pin trusted package versions and ask for explicit confirmation before running installation commands.
  2. FIX-002
    Medium
    Generated prompts are transmitted to third-party image services.
    Disclose the external data transfer and warn users not to include confidential information in prompts.

Expert evidence

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

Artifact subject

Marketplace commit
d71c7417a35d5c2624161bd2fe8de8a41a362128
Content hash
e7e42243da58435a7d5b465b9ca9f2cf94d5ad06cbc0cbd76dab017aef8b7bfd
Tree hash
608a8c29613c842ffff31299e52915d31ffb0a58a487574930ce03e2c4bf743c
Skill path
skills/101-skills/youtube-thumbnail-design
Audit payload hash
3c91e69371d40130edf42f380c7332f0

Analysis metadata

Audit model: codex

Analysis state: Complete

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

Verify and export

JSON report CITATION.cff SARIF 2.1.0 Signed installation manifest Source

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

Audit attestation: not_attestable