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Transform draft prompts into production-grade instructions for Claude Fable 5. Triggers when a user provides a draft prompt, system message, or CLAUDE.md to improve — or asks to optimize, refine, harden, or enhance a prompt; wants to design a multi-agent research workflow, orchestrate a Claude Code dynamic workflow, or build a CLAUDE.md that fans out parallel research; mentions 'prompt engineering'; or pastes a prompt with intent to improve it. Applies Fable 5 best practices (adaptive thinking always-on, saturation-aware effort selection with xhigh as the skill default for coding/agentic work and max for frontier reasoning, no-silent-fallback deployment guidance, anti-overtriggering, completion-verification, explicit tool-use and dynamic-workflow orchestration, long-context verification posture, six-pattern long-horizon failure taxonomy) and runs mandatory live web research against Anthropic documentation to calibrate to the target deployment (API, Claude Code CLI, claude.ai, Cowork (Desktop), Managed Agents). Not for one-off content writing, code generation, or answering a prompt's own question rather than improving the prompt itself.
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 -- brisket1994/prompt-optimization
Manual alternative: copy the skill folder into ~/.claude/skills/ so Claude Code loads it on next launch.
cp -r -- brisket1994/prompt-optimization ~/.claude/skills/
Install respects the composite badge: Clean proceeds, Caution prompts for confirmation, and Flagged is refused. Write operations require an API token.
3 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
12 findings · 9.3s
v0.3.74
1 finding · 1.4s
v0.1.0
0 findings · 3.8s
v1.4.0
None of the entry points this scanner reads were found in this artifact. What each scanner covers
0 findings · 0.2s
v0.1.0
No source files this scanner can analyze were found in this artifact. What each scanner covers
0 findings · 3.8s
vv0.3.2
No Go packages were found in this artifact. What each scanner covers
0 findings · 0.2s
v0.1.0
This scanner found nothing in this artifact that it assesses. What each scanner covers
0 findings · 1.0s
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 22, 2026 | Caution86 | — | agentshield ·n/a: not applicablecisco-skill-scanner: completeagent-audit-kit: completenerlo-behavioral ·n/a: not applicablenerlo-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 13 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.
5 MANIFEST_MISSING_LICENSE
Files: /repo/plugins/prompt-optimization/skills/prompt-optimization/SKILL.md, /repo/SKILL.md, /repo/plugins/prompt-optimization/SKILL.md and 2 more · reported by cisco-skill-scanner
3 SOCIAL_ENG_VAGUE_DESCRIPTION
Files: /repo/SKILL.md, /repo/plugins/prompt-optimization/SKILL.md, /repo/plugins/prompt-optimization/skills/prompt-optimization/references/SKILL.md · reported by cisco-skill-scanner
2 LAZY_LOAD_DEEP_NESTING
Files: /repo/plugins/prompt-optimization/skills/prompt-optimization/SKILL.md, /repo/plugins/prompt-optimization/skills/prompt-optimization/references/SKILL.md · reported by cisco-skill-scanner
1 AAK-MARKETPLACE-001
Files: .claude-plugin/marketplace.json · reported by agent-audit-kit
1 MANIFEST_DESCRIPTION_TOO_LONG
Files: /repo/plugins/prompt-optimization/skills/prompt-optimization/SKILL.md · reported by cisco-skill-scanner
1 SOCIAL_ENG_ANTHROPIC_IMPERSONATION
Files: /repo/plugins/prompt-optimization/skills/prompt-optimization/SKILL.md · reported by cisco-skill-scanner
No summary was published. A summary was drafted and rejected by our text checks.