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Master REST and GraphQL API design principles to build intuitive, scalable, and maintainable APIs that delight developers. Use when designing new APIs, reviewing API specifications, or establishing API design standards.
Claude Skills are markdown + scripts loaded into Claude Code; scanned with the same pipeline.
We found this by crawling public sources and nobody has attested to it. That is how most of the registry gets here, and it is not a mark against the artifact — it only means no authenticated act of publication is on record. An artifact can be the vendor's own and still appear here.
1 critical finding reported by cisco-skill-scanner. The composite score alone does not reflect this — read the per-scanner reports below.
Claude Skills install to a single target, no runtime picker.
nerlo install -- 'markky21/claude-skills (api-design-principles)'
Manual alternative: copy the skill folder into ~/.claude/skills/ so Claude Code loads it on next launch.
cp -r -- 'markky21/claude-skills (api-design-principles)' ~/.claude/skills/
Install respects the composite badge: Clean proceeds, Caution prompts for confirmation, and Flagged is refused. Write operations require an API token.
5 of 11 scanners examined this package. The rest do not apply to it — language, ecosystem and packaging decide which analyzers can say anything, and a scanner that cannot examine an artifact reports nothing rather than passing it.
v1.4.0
0 findings · 0.6s
v2.0.11
283 findings · 19.9s
v0.3.74
4 findings · 3.3s
v0.1.0
0 findings · 4.9s
v0.1.0
0 findings · 4.9s
vv0.3.2
No Go packages were found in this artifact. What each scanner covers
0 findings · 0.1s
v0.1.0
This scanner found nothing in this artifact that it assesses. What each scanner covers
0 findings · 0.9s
No report in this scan: govulncheck, osv-scanner, trivy, trivy_image.
1 scan on record. Every scan's full results are retained immutably for 24 months.
| Completed | Composite | Change | Scanners | Status |
|---|---|---|---|---|
| Aug 21, 2026 | Scan Halted | — | agentshield: completecisco-skill-scanner: completeagent-audit-kit: completenerlo-behavioral: completenerlo-install-instruction: completecapslock ·n/a: not applicablenerlo-multi-source ·n/a: not applicable | rejected |
Findings in files this artifact installs stand as reported; a model re-read the rest and said which ones it believes are false positives. This is a second opinion published beside the evidence, not a correction to it: the per-scanner reports above are unchanged, every dismissed finding is still listed there at its original severity, and the score and the Flagged badge are computed from those raw severities alone. Nothing below moved them.
Out of 287 findings across every scanner that examined this package. None of the 1 finding rated critical by their scanner were dismissed.
Two keys had to turn. The model had to name a reason from a fixed list of six, and a deterministic check of ours — over which files this artifact actually installs — had to independently agree. Anything it could not corroborate is in “not reviewed” above, at full severity.
4 Documentation or example — The match is in documentation or sample code, confirmed by our own check to be outside the installed artifact.
Rules: SOCIAL_ENG_VAGUE_DESCRIPTION, MANIFEST_MISSING_LICENSE · Files: /repo/plugins/my-personal-tools/docs/SKILL.md, /repo/docs/plans/SKILL.md · reported by cisco-skill-scanner
These findings are in files this artifact installs and are not placeholder values. No false-positive basis can be corroborated for such a finding, so this review never dismisses one; they were not sent to the model and stand at their scanner's severity.
234 HIDDEN_DATA_FILE
Files: /repo/.agents/skills/next-best-practices/SKILL.md, /repo/.agents/skills/vue-best-practices/reference/refs-in-collections-need-value.md, /repo/.agents/skills/vue-best-practices/reference/reactivity-computed-over-watcheffect-mutations.md and 231 more · reported by cisco-skill-scanner
26 MANIFEST_MISSING_LICENSE
Files: /repo/.claude/skills/writing-clearly-and-concisely/SKILL.md, /repo/.claude/skills/web-design-guidelines/SKILL.md, /repo/plugins/my-personal-tools/skills/dry-violations/SKILL.md and 23 more · reported by cisco-skill-scanner
9 SOCIAL_ENG_VAGUE_DESCRIPTION
Files: /repo/SKILL.md, /repo/.claude/skills/vercel-react-best-practices/rules/SKILL.md, /repo/.claude/skills/writing-clearly-and-concisely/elements-of-style/SKILL.md and 6 more · reported by cisco-skill-scanner
4 HIDDEN_EXECUTABLE_SCRIPT
Files: /repo/.agents/skills/ui-ux-pro-max/scripts/search.py, /repo/.agents/skills/api-design-principles/assets/rest-api-template.py, /repo/.agents/skills/ui-ux-pro-max/scripts/core.py and 1 more · reported by cisco-skill-scanner
3 EXCESSIVE_FILE_COUNT
Files: /repo/., /repo/.agents/skills/vue-best-practices/., /repo/.agents/skills/vue-best-practices/reference/. · reported by cisco-skill-scanner
2
Critical SQL injection and hidden executables found
The artifact contains a critical SQL injection vulnerability in `/repo/plugins/my-personal-tools/skills/clean-code/SKILL.md`, which could allow unauthorized data access or manipulation. Multiple hidden executable scripts, such as Python files in `/repo/.agents/skills/api-design-principles/assets/rest-api-template.py` and `/repo/.agents/skills/ui-ux-pro-max/scripts/`, are present and could enable shell execution. High-severity findings also indicate potential for broad data access or interaction with external services, specifically in `.claude-plugin/marketplace.json` and `plugins/my-personal-tools/agents/database-schema-designer-validator.md`. These capabilities warrant careful review before installation.
Concern level assessed by the review: Critical. This is the review's scale, not the registry badge.
Reviewed by gemini-2.5-flash. The model sees the findings, not your code, and cannot change a score.
Files: /repo/.agents/skills/ui-ux-pro-max/data/react-performance.csv · reported by cisco-skill-scanner
1 AAK-HEALTHCARE-AI-004
Files: .claude/skills/writing-clearly-and-concisely/signs-of-ai-writing.md · reported by agent-audit-kit
1 AAK-IPI-WILD-CORPUS-001
Files: plugins/my-personal-tools/agents/database-schema-designer-validator.md · reported by agent-audit-kit
1 AAK-LEGAL-002
Files: plugins/my-personal-tools/skills/clean-code/package.json · reported by agent-audit-kit
1 AAK-MARKETPLACE-001
Files: .claude-plugin/marketplace.json · reported by agent-audit-kit
1 YARA_sql_injection_generic
Files: /repo/plugins/my-personal-tools/skills/clean-code/SKILL.md · reported by cisco-skill-scanner