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Structured bug investigation using formal models for hypothesis-driven debugging. Builds scoped Alloy models (normative rules, data constraints, causal chains, observability) to generate distinguishing experiments and narrow the causality cone around a symptom. Use whenever the user reports a bug, incident, or unexpected behavior and wants rigorous investigation. Trigger on "investigate", "root cause", "debug this", "why does this happen", "find the bug", "postmortem", or any unexplained symptom. Valuable for: business-rule bugs, state machine errors, workflow inconsistencies, cross-service disagreements, investigations where the obvious explanation was already checked. Not for simple stack traces or typos — use when the problem space is large enough that unstructured search would waste time or miss the real cause.
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.
Claude Skills install to a single target, no runtime picker.
nerlo install -- 'in8finity/codex-formal-plugin (formal-debugger)'
Manual alternative: copy the skill folder into ~/.claude/skills/ so Claude Code loads it on next launch.
cp -r -- 'in8finity/codex-formal-plugin (formal-debugger)' ~/.claude/skills/
Install respects the composite badge: Clean proceeds, Caution prompts for confirmation, and Flagged is refused. Write operations require an API token.
4 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.
v2.0.11
19 findings · 8.7s
v0.3.74
1 finding · 1.6s
v0.1.0
0 findings · 3.2s
v0.1.0
10 findings · 3.2s
v1.4.0
None of the entry points this scanner reads were found in this artifact. What each scanner covers
0 findings · 0.2s
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
v0.71.0
No dependency manifest or lockfile was found in this artifact. What each scanner covers
0 findings · 0.2s
v2.3.8
No dependency manifest or lockfile was found in this artifact. What each scanner covers
0 findings · 0.1s
v0.71.0
No container image was published for this artifact. What each scanner covers
0 findings · 0.0s
vv1.6.0
No Go modules were found in this artifact. What each scanner covers
0 findings · 0.1s
1 scan on record. Every scan's full results are retained immutably for 24 months.
| Completed | Composite | Change | Scanners | Status |
|---|---|---|---|---|
| Aug 21, 2026 | Caution89 | — | agentshield ·n/a: not applicablecisco-skill-scanner: completeagent-audit-kit: completenerlo-behavioral: completenerlo-install-instruction: completecapslock ·n/a: not applicablenerlo-multi-source ·n/a: not applicabletrivy ·n/a: not applicableosv-scanner ·n/a: not applicabletrivy_image ·n/a: not applicablegovulncheck ·n/a: not applicable | completed |
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 Caution badge are computed from those raw severities alone. Nothing below moved them.
Out of 30 findings across every scanner that examined this package.
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.
9 MANIFEST_MISSING_LICENSE
Files: /repo/plugins/formal-methods/skills/formal-debugger/SKILL.md, /repo/plugins/formal-methods/skills/formal-modeling/SKILL.md, /repo/SKILL.md and 6 more · reported by cisco-skill-scanner
7 SOCIAL_ENG_VAGUE_DESCRIPTION
Files: /repo/SKILL.md, /repo/plugins/formal-methods/SKILL.md, /repo/plugins/formal-methods/skills/formal-debugger/templates/SKILL.md and 4 more · reported by cisco-skill-scanner
6 opt.nerlo-rules.nerlo-install-run-bundled-artifact
Files: /repo/plugins/formal-methods/skills/formal-debugger/SKILL.md, /repo/plugins/formal-methods/skills/formal-modeling/SKILL.md, /repo/plugins/formal-methods/skills/formal-modeling/references/pipeline-example.als and 3 more · reported by nerlo-install-instruction
4 opt.nerlo-rules.nerlo-install-shell-inline-command
Files: /repo/plugins/formal-methods/skills/formal-modeling/scripts/alloy_run.sh · reported by nerlo-install-instruction
3 HIDDEN_DATA_FILE
Files: /repo/plugins/formal-methods/.codex-plugin/plugin.json, /repo/.agents/plugins/marketplace.json · reported by cisco-skill-scanner
1 AAK-MARKETPLACE-001
Files: .agents/plugins/marketplace.json · reported by agent-audit-kit
High-severity finding in plugin configuration
The artifact contains a high-severity finding related to plugin configuration in `.agents/plugins/marketplace.json`. This finding warrants attention due to its potential impact on the artifact's operational integrity. Additionally, there are low-severity findings concerning vague descriptions and hidden data files, which may affect clarity or transparency.
Concern level assessed by the review: High. 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.