Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add majiayu000/claude-skill-registry --skill 39-agent-skills-mcp-code-execution-panaversity-agentfactorygit clone --depth 1 https://github.com/majiayu000/claude-skill-registryWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/majiayu000/claude-skill-registry/39-agent-skills-mcp-code-execution-panaversity-agentfactory)<a href="https://agentmods.dev/skills/majiayu000/claude-skill-registry/39-agent-skills-mcp-code-execution-panaversity-agentfactory"><img src="https://agentmods.dev/badge/skills/majiayu000/claude-skill-registry/39-agent-skills-mcp-code-execution-panaversity-agentfactory/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/majiayu000/claude-skill-registry/39-agent-skills-mcp-code-execution-panaversity-agentfactory"><img src="https://agentmods.dev/badge/skills/majiayu000/claude-skill-registry/39-agent-skills-mcp-code-execution-panaversity-agentfactory.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Rogue Agent · line 17 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Agent Snooping · line 472 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Excessive Agency · line 597 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00039 | $0.06370 |
| Opus 5 | $0.00019 | $0.03185 |
| Sonnet 5 | $0.00008 | $0.01274 |
| Haiku 4.5 | $0.00004 | $0.00637 |
Grade A, and why
39-agent-skills-mcp-code-execution-panaversity-agentfactory scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 13d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 799 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Capstone: Shippable Agent Skill
You've now learned every pattern this chapter teaches: persona design (Lesson 1), skill composition (Lesson 2), MCP-wrapping (Lessons 3-4), script execution (Lessons 5-6), and workflow orchestration (Lesson 7).
But learning patterns is not the same as building products.
This capstone is different. You're not following steps or solving a predetermined problem. You're doing what every AI-native entrepreneur must do: articulate a problem clearly enough that AI can build a solution to it, then validate that solution works in the real world.
You're building a specification-first Digital FTE—a complete, shippable execution skill that solves a real customer problem. This skill will orchestrate the accumulated intelligence from all previous lessons, handle production edge cases, and be ready to monetize.
Why This Capstone Matters
In the agent economy, the developers who win are those who can:
- Identify customer problems that are specific enough to solve but broad enough to charge for
- Write specifications clearly so AI can implement without ambiguity
- Compose existing intelligence rather than reinventing patterns
- Validate ruthlessly that the product works before claiming it's production-ready
- Price strategically to capture value without leaving money on the table
This capstone exercises all five. You're not learning to code faster. You're learning to build products that customers pay for.
Phase 1: Domain Specification (Spec FIRST)
Before any implementation, define what problem you're solving for whom.
Select Your Domain
Choose a domain where you have expertise or strong interest. This skill should solve a real problem you've experienced or observed:
Domain Categories:
- Professional Services: Legal document review, financial analysis, code review, technical writing
- Content Operations: Social media scheduling, newsletter writing, content moderation, SEO optimization
- Data Processing: Sales pipeline analysis, customer segmentation, report generation, data validation
- System Operations: Log analysis, configuration validation, performance monitoring, security compliance
- Creative: Image description, metadata generation, caption writing, style adaptation
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 13d ago First seen · 799 lines · 39 tokens per session scan A 2f1537566b9c
39-agent-skills-mcp-code-execution-panaversity-agentfactory is a skill published in the GitHub repository majiayu000/claude-skill-registry (604 stars, last pushed yesterday), licensed MIT. It adds 39 tokens to every session and 6,370 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
39-agent-skills-mcp-code-execution-panaversity-agentfactory
Build a specification-first Digital FTE that orchestrates accumulated intelligence from Lessons 1-7. Learn to compose execution skills into production-ready agents, validate against specifications, and position for monetization.
happiness-skill
A Chinese-language guide to happiness based on reducing unmet wants, focusing on the present, and treating happiness as a trainable skill.
docx-comment-reply
Reply to comments (批注) in Word .docx/.doc files: extract comment context, draft replies, write threaded replies back, and validate OOXML.
asc-subscription-localization
Bulk-localize subscription, subscription-group, and in-app purchase display names across App Store locales using asc, including API 4.4.1 version-scoped v2 resources. Use when filling or updating subscription/IAP names and descriptions without App Store Connect UI work.
influence-psychology
Apply the seven principles of ethical persuasion (reciprocity, commitment, social proof, authority, liking, scarcity, unity) to product design, copy, and sales. Use when the user mentions "social proof", "persuasive copy", "why users dont convert", "ethical persuasion", "reciprocity", "scarcity tactics", "commitment…
jobs-to-be-done
Discover what customers truly need by analyzing the "job" they hire your product to do. Use when the user mentions "customer discovery", "why customers churn", "what job does this solve", "competing against luck", "product-market fit", "switching behavior", "milkshake moment", or "functional vs emotional jobs". Also…