Claude Code, Skill
skills
Public collection of Agent Skills used by Arthur across Codex, Claude Code, and other compatible coding agents.
Compatibility: Not stated.
Grade C
One Medium finding. Read the report before installing.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
INSTALL_REMOTE_SCRIPT
Why this grade
- INSTALL_REMOTE_SCRIPT Medium
Fetches a script from the network and runs it (a pipe to a shell, or an install hook with a URL).
skills/clerk-cli/scripts/clerk-ensure.sh, line 21
fail "bun not found. Install: curl -fsSL https://bun.sh/install | bash"
Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.
Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.
What was checked
Plain notes from the hygiene checks.
Permissions
Note
requests shell access. The manifest names this permission.
PERMISSION_SHELL_DECLARED
skills/security-review/references/security-checklist.md, line 39
**Indicators:** `exec()`, `system()`, `popen()`, `child_process.exec()`, `os.system()`, `subprocess.run(shell=True)`, backtick execution.
skills/security-review/references/security-checklist.md, line 44
- Missing use of parameterized command execution (e.g., `subprocess.run([...])` instead of shell=True)
skills/security-review/references/security-checklist.md, line 202
| `subprocess.run(cmd, shell=True)` | Command injection | Use list form: `subprocess.run([...])` |
Install and update
Serious
install fetches a script from the network.
INSTALL_REMOTE_SCRIPT
skills/clerk-cli/scripts/clerk-ensure.sh, line 21
fail "bun not found. Install: curl -fsSL https://bun.sh/install | bash"
skills/posthog-cli/scripts/posthog-ensure.sh, line 22
fail "bun not found. Install: curl -fsSL https://bun.sh/install | bash"
Network
Concern
can reach a host that is not written as a fixed address. can reach api.example.com. The description does not name that host. can reach assets4.lottiefiles.com. The description does not name that host. can reach my-app-xyz.vercel.app. The description does not name that host. can reach api.vercel.com. The description does not name that host.
NETWORK_NO_FIXED_HOST NETWORK_UNNAMED_HOST
crates/arthur-skills/src/upstream/git.rs, line 20
fn fetch(
crates/arthur-skills/src/upstream/git.rs, line 30
fn fetch(
crates/arthur-skills/src/upstream/git.rs, line 54
UpstreamError::fetch(format!("{}: {message}", skill.name))
Show more
crates/arthur-skills/src/upstream/git.rs, line 68
return Err(UpstreamError::fetch(format!(
crates/arthur-skills/src/upstream/git.rs, line 84
Err(UpstreamError::fetch(message))
crates/arthur-skills/src/upstream/git.rs, line 96
Err(error) => Err(UpstreamError::fetch(format!(
crates/arthur-skills/src/upstream/git.rs, line 118
return Err(UpstreamError::fetch(format!(
crates/arthur-skills/src/upstream/git.rs, line 134
return Err(UpstreamError::fetch(format!(
Secrets
Concern
reads a credential or environment file.
SECRETS_ENV_READ SECRETS_PATH_DOTENV
crates/arthur-skills/src/transaction.rs, line 3345
.env("ARTHUR_SKILLS_SIGKILL_BASE", directory.path())
crates/arthur-skills/src/transaction.rs, line 3346
.env("ARTHUR_SKILLS_SIGKILL_TARGET", target.to_string())
skills/better-auth-security-best-practices/SKILL.md, line 14
secret: process.env.BETTER_AUTH_SECRET, // or via `BETTER_AUTH_SECRET` env
Show more
skills/better-auth-security-best-practices/SKILL.md, line 345
secret: process.env.BETTER_AUTH_SECRET,
skills/clerk-cli/scripts/_lib.sh, line 10
# Auto-load CLERK_SECRET_KEY (and CLERK_API_VERSION) from a project .env file if not
skills/clerk-cli/scripts/_lib.sh, line 11
# already set in the shell. Walks up from $PWD looking for .env.local then .env, stopping
skills/clerk-cli/scripts/_lib.sh, line 15
# Precedence: shell env > .env.local > .env > error.
skills/clerk-cli/scripts/_lib.sh, line 21
for f in .env.local .env; do
skills/clerk-cli/scripts/_lib.sh, line 54
# Try to load from .env first; this is a no-op if CLERK_SECRET_KEY is already exported.
skills/clerk-cli/scripts/_lib.sh, line 60
# Require CLERK_SECRET_KEY in the environment (or loadable from a project .env file).
skills/mcp-server-dev/references/advanced-patterns.md, line 433
const apiKey = process.env.API_KEY
skills/remotion-best-practices/rules/voiceover.md, line 36
"xi-api-key": process.env.ELEVENLABS_API_KEY!,
Agent instructions
Pass
No instruction to ignore earlier instructions or to hide a step.
Obfuscation
Pass
No encoded or minified payload found.
Licence
Pass
A licence file is present (LICENSE).
Maintainer activity
Pass
The latest commit is within the last 365 days.
Note
Hygiene check of commit b960affe5630. requests shell access. The manifest names this permission. install fetches a script from the network. can reach a host that is not written as a fixed address. can reach api.example.com. The description does not name that host. can reach assets4.lottiefiles.com. The description does not name that host. can reach my-app-xyz.vercel.app. The description does not name that host. can reach api.vercel.com. The description does not name that host. reads a credential or environment file.
Date and source
Date checked:
github.com
Commit graded: b960affe56302549b9d4c12f3b5c2e5581d36486
This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.