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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.
26 critical findings reported by cisco-skill-scanner, agent-audit-kit, 16 of them in the installed artifact. 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 -- spellbook
Manual alternative: copy the skill folder into ~/.claude/skills/ so Claude Code loads it on next launch.
cp -r -- spellbook ~/.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
2 findings · 1.4s
v2.0.11
1256 findings · 59.2s
v0.3.74
40 findings · 21.8s
v0.1.0
6 findings · 24.9s
v0.1.0
19 findings · 25.0s
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 · 1.8s
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 22, 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 1,323 findings across every scanner that examined this package. 10 of 26 findings rated critical by their scanner were among the dismissals.
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.
825 Test or fixture file — The match is in a test or fixture. Our own check confirmed the file is not part of what gets installed.
Rules: COMMAND_INJECTION_JS_CHILD_PROCESS, AAK-INDIA-PII-001, AAK-SECRET-004 and 3 more · Files: /repo/plugins/spellbook/skills/bounty/scripts/server.test.ts, plugins/spellbook/skills/mind-mapper/scripts/propose.test.ts, plugins/spellbook/skills/bounty/scripts/server.test.ts and 13 more · reported by cisco-skill-scanner, agent-audit-kit
142 Documentation or example — The match is in documentation or sample code, confirmed by our own check to be outside the installed artifact.
Rules: opt.nerlo-rules.nerlo-js-secret-to-network-egress, AAK-HEALTHCARE-AI-004, YARA_prompt_injection_unicode_steganography and 8 more · Files: /repo/docs/projects/_archive/image-style-spell/artifacts/model-tests/run.ts, docs/fragments/2026-08-05-project-roadmap-surface.md, docs/projects/magpie-rebuild/phase-spine-design.md and 69 more · reported by nerlo-behavioral, agent-audit-kit, cisco-skill-scanner and 1 more
1 CI or editor configuration — The match is in build, CI or editor configuration, confirmed by our own check to be outside the installed artifact.
Rules: AAK-GHA-IMMUTABLE-001 · Files: .github/workflows/release-please.yml · reported by agent-audit-kit
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.
248 DATA_EXFIL_JS_NETWORK
Files: /repo/plugins/spellbook/skills/glamour/scripts/cli.ts, /repo/plugins/spellbook/skills/bounty/scripts/cli.ts, /repo/plugins/spellbook/skills/grapevine/scripts/cli.ts and 13 more · reported by cisco-skill-scanner
20 MANIFEST_MISSING_LICENSE
Files: /repo/.claude/skills/ward/SKILL.md, /repo/.claude/skills/land/SKILL.md, /repo/.claude/skills/inscribe/SKILL.md and 17 more · reported by cisco-skill-scanner
14 COMMAND_INJECTION_EVAL
Files: /repo/plugins/spellbook/skills/mind-mapper/dist/index-8tqhhyxr.js · reported by cisco-skill-scanner
14 HIDDEN_DATA_FILE
Files: /repo/.anthill/dev/README.md, /repo/.anthill/dev/prospero.md, /repo/.anthill/dev/thoth.md and 11 more · reported by cisco-skill-scanner
13 SOCIAL_ENG_VAGUE_DESCRIPTION
Files: /repo/plugins/spellbook/skills/glamour/SKILL.md, /repo/plugins/spellbook/skills/imago/SKILL.md, /repo/plugins/spellbook/skills/astrolabe/SKILL.md and 10 more
Critical command injection and path traversal vulnerabilities detected.
The artifact contains critical command injection vulnerabilities in `mind-mapper/dist/index-8tqhhyxr.js` and `src/mind-mapper/build.ts`, allowing for shell execution. A critical path traversal vulnerability is present in `plugins/spellbook/skills/bounty/scripts/join.ts`, which could lead to unauthorized file access. Additionally, there is a high-severity finding indicating potential credential access and exfiltration over the network, alongside numerous medium-severity network egress findings.
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.
9 LOW_ANALYZABILITY
Files: /repo, /repo/plugins/spellbook/skills/glamour, /repo/plugins/spellbook/skills/astrolabe and 6 more · reported by cisco-skill-scanner
7 YARA_autonomy_abuse_generic
Files: /repo/plugins/spellbook/skills/imago/scripts/cli.ts, /repo/plugins/spellbook/skills/imago/references/SKILL.md · reported by cisco-skill-scanner
5 AAK-HEALTHCARE-AI-004
Files: grimoire/house-style.md, plugins/spellbook/skills/grapevine/SKILL.md, .anthill/dev/circe.md and 2 more · reported by agent-audit-kit
4 opt.nerlo-rules.nerlo-js-secret-to-network-egress
Files: /repo/plugins/spellbook/skills/bounty/scripts/cli.ts, /repo/plugins/spellbook/skills/grapevine/scripts/cli.ts, /repo/plugins/spellbook/skills/grapevine/scripts/daemon.ts and 1 more · reported by nerlo-behavioral
3 FILE_MAGIC_MISMATCH
Files: /repo/plugins/spellbook/skills/bounty/scripts/join.ts · reported by cisco-skill-scanner
3 opt.nerlo-rules.nerlo-install-shell-inline-command
Files: /repo/.anthill/dev/cassandra.md, /repo/.anthill/dev/daedalus.md · reported by nerlo-install-instruction
2 EXCESSIVE_FILE_COUNT
Files: /repo/., /repo/plugins/spellbook/skills/. · reported by cisco-skill-scanner
2 opt.nerlo-rules.nerlo-install-run-bundled-artifact
Files: /repo/plugins/spellbook/skills/astrolabe/SKILL.md, /repo/plugins/spellbook/skills/bounty/SKILL.md · reported by nerlo-install-instruction
1 AAK-LEGAL-002
Files: package.json · reported by agent-audit-kit
1 AAK-MARKETPLACE-001
Files: .claude-plugin/marketplace.json · reported by agent-audit-kit
1 AAK-MCP-AUTH-PATHTRAVERSAL-001
Files: plugins/spellbook/skills/bounty/scripts/join.ts · reported by agent-audit-kit
1 AAK-SUPPLY-003
Files: package.json · reported by agent-audit-kit
1 AAK-SUPPLY-004
Files: package.json · reported by agent-audit-kit
1 COMMAND_INJECTION_JS_CHILD_PROCESS
Files: /repo/src/mind-mapper/build.ts · reported by cisco-skill-scanner
1 hooks-no-pretooluse
Files: .zed/settings.json · reported by agentshield
1 MANIFEST_DESCRIPTION_TOO_LONG
Files: /repo/plugins/spellbook/skills/bounty/SKILL.md · reported by cisco-skill-scanner
1 MANIFEST_INVALID_NAME
Files: /repo/.anthill/SKILL.md · reported by cisco-skill-scanner
1 opt.nerlo-rules.nerlo-hardcoded-external-egress
Files: /repo/plugins/spellbook/skills/magpie/scripts/discover.ts · reported by nerlo-behavioral
1 permissions-no-block
Files: .zed/settings.json · reported by agentshield
Showing 25 of 29; the rest are in the per-scanner reports above.