sanyuan-skills is a collection of reusable instructions, called agent skills, that extend Claude Code and other AI coding terminals with defined workflows. Developers use it for code review, learning, skill quality checks, skill creation, and organizing knowledge into wikis or study materials. The catalogue entries are individual skills from this collection.
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 sanyuan0704/sanyuan-skills --skill skill-forgegit clone --depth 1 https://github.com/sanyuan0704/sanyuan-skillsWrote 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/sanyuan0704/sanyuan-skills/skill-forge)<a href="https://agentmods.dev/skills/sanyuan0704/sanyuan-skills/skill-forge"><img src="https://agentmods.dev/badge/skills/sanyuan0704/sanyuan-skills/skill-forge/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/sanyuan0704/sanyuan-skills/skill-forge"><img src="https://agentmods.dev/badge/skills/sanyuan0704/sanyuan-skills/skill-forge.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector warn
SkillSpector: 4 findings, up to high
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 →
- high Rogue Agent · line 3 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- high Rogue Agent · line 44 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- high Rogue Agent · line 110 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- medium Excessive Agency · line 228 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 | $0.00137 | $0.02279 |
| Opus 5 | $0.00068 | $0.01140 |
| Sonnet 5 | $0.00027 | $0.00456 |
| Haiku 4.5 | $0.00014 | $0.00228 |
Grade A, and why
skill-forge 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 12d 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 — 248 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Forge
IRON LAW: Every line in a skill must justify its token cost. If it doesn't make the model's output better, more consistent, or more reliable — cut it.
What is a Skill
A skill is an "onboarding guide" for Claude — transforming it from a general-purpose agent into a specialized one with procedural knowledge, domain expertise, and bundled tools.
skill-name/
├── SKILL.md # Required: workflow + instructions (<500 lines)
├── scripts/ # Optional: deterministic, repeatable operations
├── references/ # Optional: loaded into context on demand
└── assets/ # Optional: used in output, never loaded into context
Default assumption: Claude is already very smart. Only add what Claude doesn't already know. Challenge every paragraph: "Does this justify its token cost?"
Workflow
Copy this checklist and check off items as you complete them:
Skill Forge Progress:
- [ ] Step 1: Understand the Skill ⚠️ REQUIRED
- [ ] 1.1 Clarify purpose and concrete use cases
- [ ] 1.2 Collect 3+ concrete usage examples
- [ ] 1.3 Identify trigger scenarios and keywords
- [ ] Step 2: Plan Architecture
- [ ] 2.1 Identify reusable resources (scripts, references, assets)
- [ ] 2.2 Design progressive loading strategy
- [ ] 2.3 Design parameter system (if applicable)
- [ ] Step 3: Initialize ⛔ BLOCKING (skip if skill already exists)
- [ ] Run init_skill.py
- [ ] Step 4: Write Description
- [ ] Load references/description-guide.md
- [ ] Apply keyword bombing technique
- [ ] Step 5: Write SKILL.md Body
- [ ] 5.1 Set Iron Law
- [ ] 5.2 Design workflow checklist
- [ ] 5.3 Add confirmation gates
- [ ] 5.4 Add parameter system (if applicable)
- [ ] 5.5 Apply writing techniques
- [ ] 5.6 Add anti-patterns list
- [ ] 5.7 Add pre-delivery checklist
- [ ] Step 6: Build Resources
- [ ] 6.1 Implement and test scripts
- [ ] 6.2 Write reference files
- [ ] 6.3 Prepare assets
- [ ] Step 7: Review ⚠️ REQUIRED
- [ ] Run pre-delivery checklist (Step 9)
- [ ] Present summary to user for confirmation
- [ ] Step 8: Package
- [ ] Run package_skill.py
- [ ] Step 9: Iterate based on real usage
What ships with it
10 files 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.
- README.md 2.9 KB
- references/architecture-guide.md 5.5 KB
- references/description-guide.md 3.2 KB
- references/output-patterns.md 2.9 KB
- references/parameter-system.md 2.9 KB
- references/workflow-patterns.md 4.9 KB
- references/writing-techniques.md 4.4 KB
- scripts/init_skill.py 5.1 KB runs code
- scripts/package_skill.py 2.9 KB runs code
- scripts/quick_validate.py 3.1 KB runs code
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.
- 12d ago First seen · 248 lines · 137 tokens per session scan A 667e8c1d9680
skill-forge is a skill published in the GitHub repository sanyuan0704/sanyuan-skills (3,904 stars, last pushed 4mo ago), licensed MIT. It adds 137 tokens to every session and 2,279 once invoked, about $0.0007 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.
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