Claude Code, Skill
skillcheck
Know whether the AI agent skills on your machine are safe — in seconds, with no install.
Compatibility: Not stated.
Grade B
Minor issues only, no Medium or High. Worth a quick look at the findings below before installing.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
PERMISSION_DELETE_FILES NETWORK_NO_FIXED_HOST OBFUSCATION_ENCODED_BLOB
Why this grade
- PERMISSION_DELETE_FILES Low
Contains a call that can delete files.
scripts/npm-package.mjs, line 130
fs.rmSync(outDir, { recursive: true, force: true }); - NETWORK_NO_FIXED_HOST Low
Makes a network call whose host is not written as a fixed address.
scripts/verify-npm-release.sh, line 62
if curl --fail --silent --show-error --location --max-time 20 "$url" 2>/dev/null \ - OBFUSCATION_ENCODED_BLOB Low
Contains a long base64 shaped string in a file that should be readable.
internal/engine/schemas/os.resources.json, line 1
{"resources":{"agentinstructions":{"id":"agentinstructions","name":"agentinstructions","fields":{"file":{"name":"file","type":"\u001bagentinstructions.file","title":"AI agent instr
Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.
Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.
What was checked
Plain notes from the hygiene checks.
Permissions
Concern
can delete files.
PERMISSION_DELETE_FILES
scripts/npm-package.mjs, line 130
fs.rmSync(outDir, { recursive: true, force: true });
scripts/npm-package.mjs, line 153
fs.rmSync(outDir, { recursive: true, force: true });
scripts/npm-package.test.mjs, line 274
if (d.startsWith('skillcheck_')) fs.rmSync(path.join(modules, d), { recursive: true });
Install and update
Pass
No install-time script found, and dependencies are pinned or absent.
Network
Concern
can reach a host that is not written as a fixed address.
NETWORK_NO_FIXED_HOST
scripts/verify-npm-release.sh, line 62
if curl --fail --silent --show-error --location --max-time 20 "$url" 2>/dev/null \
Secrets
Pass
No read of a credential file or secret environment variable found.
Agent instructions
Pass
No instruction to ignore earlier instructions or to hide a step.
Obfuscation
Concern
contains an encoded blob in a file that should be readable.
OBFUSCATION_ENCODED_BLOB
internal/engine/schemas/os.resources.json, line 1
{"resources":{"agentinstructions":{"id":"agentinstructions","name":"agentinstructions","fields":{"file":{"name":"file","type":"\u001bagentinstructions.file","title":"AI agent instr
internal/validate/testdata/spec-violations/skills/long-compat/SKILL.md, line 4
compatibility: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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 1cfbe6b6fb84. can delete files. can reach a host that is not written as a fixed address. contains an encoded blob in a file that should be readable.
Date and source
Date checked:
github.com
Commit graded: 1cfbe6b6fb84c0e484f3d247d1831c5fd1d1e52b
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