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Harness-augmentation layer for AI coding assistants: skills, commands, hooks, and a shared MCP server
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.
33 critical findings reported by cisco-skill-scanner, agent-audit-kit, 24 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
0 findings · 0.4s
v2.0.11
1350 findings · 44.0s
v0.3.74
63 findings · 33.8s
v0.1.0
1 finding · 9.1s
v0.1.0
48 findings · 9.1s
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 · 1.0s
No report in this scan: govulncheck, osv-scanner, trivy, trivy_image.
2 scans on record. Every scan's full results are retained immutably for 24 months.
| Completed | Composite | Change | Scanners | Status |
|---|---|---|---|---|
| Sep 3, 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 |
| Aug 11, 2026 | Scan Halted | — | agentshield: completecisco-skill-scanner: completeagent-audit-kit: completenerlo-behavioral: completenerlo-install-instruction: completecapslock ·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 1,462 findings across every scanner that examined this package. 9 of 33 findings rated critical by their scanner were among the dismissals.
Not reviewed is not the same as clean. Those 14 findings stand exactly as their scanners reported them, at full severity, as they would have without this review.
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.
517 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_EVAL, AAK-DNS-REBIND-001, AAK-INDIA-PII-001 and 15 more · Files: /repo/tests/test_skills/test_review_skill_contracts.py, tests/installer/test_legacy_token_removal.py, tests/test_hooks/test_agent2agent_hook.py and 21 more · reported by cisco-skill-scanner, agent-audit-kit
204 Documentation or example — The match is in documentation or sample code, confirmed by our own check to be outside the installed artifact.
Rules: COMPOUND_FETCH_EXECUTE, opt.nerlo-rules.nerlo-install-pipe-to-shell, PIPELINE_TAINT_FLOW and 7 more · Files: /repo/docs/getting-started/installation.md, /repo/docs/getting-started/SKILL.md, /repo/docs/index.md and 41 more · reported by cisco-skill-scanner, nerlo-install-instruction, agent-audit-kit
15 Agent instruction file — The match is in a file that instructs an AI coding agent — a CLAUDE.md or similar. It is documentation of intent, and our own check confirmed it is not part of what gets installed.
Rules: AAK-AGENT-003, TOOL_ABUSE_UNDECLARED_NETWORK, AAK-AGENT-001 · Files: AGENTS.md, /repo/repo/AGENTS.md, /repo/tests/repo/tests/README.md · reported by agent-audit-kit, cisco-skill-scanner
7 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, MANIFEST_INVALID_NAME · Files: .github/workflows/test.yml, .github/workflows/integration-test.yml, .github/workflows/lint.yml and 2 more · reported by agent-audit-kit, 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.
480 YARA_autonomy_abuse_generic
Files: /repo/commands/SKILL.md · reported by cisco-skill-scanner
86 MANIFEST_MISSING_LICENSE
Files: /repo/.claude/skills/spellbook-auditing/SKILL.md, /repo/.claude/skills/documentation-updates/SKILL.md, /repo/skills/debugging/SKILL.md and 83 more · reported by cisco-skill-scanner
16 SOCIAL_ENG_VAGUE_DESCRIPTION
Files: /repo/SKILL.md, /repo/.codex/SKILL.md, /repo/.gemini/SKILL.md and 13 more · reported by cisco-skill-scanner
11 DATA_EXFIL_JS_FS_ACCESS
Files: /repo/skills/writing-skills/render-graphs.js, /repo/extensions/prime-agent/spellbook-rules.ts, /repo/lib/skills-core.js · reported by cisco-skill-scanner
10 COMMAND_INJECTION_JS_CHILD_PROCESS
Files: /repo/skills/writing-skills/render-graphs.js, /repo/hooks/opencode-plugin.ts, /repo/lib/skills-core.js · reported by cisco-skill-scanner
14 The model did not answer for these findings.
Rules: opt.nerlo-rules.nerlo-install-fetch-raw-then-run, AAK-TASKS-003, PIPELINE_TAINT_FLOW · Files: /repo/docs/getting-started/installation.md, /repo/docs/index.md, /repo/docs/windows-support-report.md and 4 more · reported by nerlo-install-instruction, agent-audit-kit, cisco-skill-scanner
Critical findings: shell execution, data exfiltration, and SQL injection.
The artifact contains multiple critical findings related to shell execution, specifically via `child_process` in JavaScript files like `/repo/hooks/opencode-plugin.ts` and `/repo/skills/writing-skills/render-graphs.js`, and `os.system` in Python scripts such as `/repo/scripts/branch-context.py`. It also exhibits critical data exfiltration capabilities through socket connections in `/repo/installer/components/mcp.py` and `/repo/spellbook/core/services.py`. Additionally, critical SQL injection vulnerabilities are present in `/repo/spellbook/fractal/query_ops.py`, and DNS rebinding risks are identified in `installer/config.py` and `installer/platforms/goose.py`.
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.
10 HIDDEN_DATA_FILE
Files: /repo/.prime/agent/session-artifacts/skill-cmd-cleanup.md, /repo/.gemini/styleguide.md, /repo/.gemini/config.yaml and 7 more · reported by cisco-skill-scanner
9 PIPELINE_TAINT_FLOW
Files: /repo/CHANGELOG.md, /repo/SKILL.md, /repo/bootstrap.sh and 2 more · reported by cisco-skill-scanner
8 DATA_EXFIL_NETWORK_REQUESTS
Files: /repo/skills/fact-checking/scripts/check-urls.py, /repo/hooks/spellbook_hook.py · reported by cisco-skill-scanner
8 RESOURCE_ABUSE_INFINITE_LOOP
Files: /repo/skills/agent2agent/scripts/agent2agent.py, /repo/installer/renderer.py, /repo/installer/tui.py and 2 more · reported by cisco-skill-scanner
7 opt.nerlo-rules.nerlo-install-pipe-to-shell
Files: /repo/CHANGELOG.md, /repo/README.md, /repo/install.py · reported by nerlo-install-instruction
6 opt.nerlo-rules.nerlo-install-run-bundled-artifact
Files: /repo/CHANGELOG.md, /repo/commands/writing-commands-create.md, /repo/skills/branch-context/SKILL.md and 1 more · reported by nerlo-install-instruction
5 AAK-HEALTHCARE-AI-004
Files: CHANGELOG.md, rules/91-role.md, commands/crystallize.md and 2 more · reported by agent-audit-kit
5 MANIFEST_INVALID_NAME
Files: /repo/.codex/SKILL.md, /repo/.gemini/SKILL.md, /repo/profiles/SKILL.md and 2 more · reported by cisco-skill-scanner
4 AAK-IPI-WILD-CORPUS-001
Files: spellbook/fractal/schema.py, spellbook/core/db.py, spellbook/hooks/observability.py and 1 more · reported by agent-audit-kit
4 DATA_EXFIL_SOCKET_CONNECT
Files: /repo/installer/components/mcp.py, /repo/spellbook/core/services.py, /repo/spellbook/daemon/service.py · reported by cisco-skill-scanner
4 opt.nerlo-rules.nerlo-install-shell-inline-command
Files: /repo/CHANGELOG.md, /repo/commands/a2a.md · reported by nerlo-install-instruction
4 TOOL_ABUSE_SYSTEM_PACKAGE_INSTALL
Files: /repo/bootstrap.sh, /repo/install.py · reported by cisco-skill-scanner
3 AAK-MCP-018
Files: scripts/check_reference_resolution.py, spellbook/mcp/tools/health.py, installer/components/mcp.py · reported by agent-audit-kit
3 COMMAND_INJECTION_OS_SYSTEM
Files: /repo/scripts/branch-context.py · reported by cisco-skill-scanner
3 opt.nerlo-rules.nerlo-install-fetch-raw-then-run
Files: /repo/README.md, /repo/install.py · reported by nerlo-install-instruction
2 AAK-DNS-REBIND-001
Files: installer/config.py, installer/platforms/goose.py · reported by agent-audit-kit
2 AAK-TASKS-003
Files: spellbook/core/models.py, spellbook/planlint/document.py · reported by agent-audit-kit
2 EXCESSIVE_FILE_COUNT
Files: /repo/., /repo/commands/. · reported by cisco-skill-scanner
2 LOW_ANALYZABILITY
Files: /repo/extensions/prime-agent, /repo/skills/writing-skills · reported by cisco-skill-scanner
2 YARA_sql_injection_generic
Files: /repo/spellbook/fractal/query_ops.py · reported by cisco-skill-scanner
1 AAK-MCP-015
Files: installer/components/mcp.py · reported by agent-audit-kit
1 AAK-MCP-DEPRECATED-001
Files: spellbook/core/path_utils.py · reported by agent-audit-kit
1 AAK-SKILL-UNTRUSTED-EXEC-PATH
Files: install.py · reported by agent-audit-kit
1 AAK-SSRF-002
Files: spellbook/core/auth.py · reported by agent-audit-kit
1 AAK-SUPPLY-004
Files: pyproject.toml · reported by agent-audit-kit
1 DATA_EXFIL_SENSITIVE_FILES
Files: /repo/install.py · reported by cisco-skill-scanner
1 opt.nerlo-rules.nerlo-dynamic-exec
Files: /repo/hooks/opencode-plugin.ts · reported by nerlo-behavioral
1 opt.nerlo-rules.nerlo-install-reverse-shell-directive
Files: /repo/CHANGELOG.md · reported by nerlo-install-instruction
1 TOOL_ABUSE_UNDECLARED_NETWORK
Files: /repo/skills/fact-checking/repo/skills/fact-checking/SKILL.md · reported by cisco-skill-scanner
Showing 25 of 71; the rest are in the per-scanner reports above.