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 xiaoshiyilangzhao1996-droid/Skill-Schema-V2 --skill skill-schema-v2git clone --depth 1 https://github.com/xiaoshiyilangzhao1996-droid/Skill-Schema-V2Wrote 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/xiaoshiyilangzhao1996-droid/skill-schema-v2/skill-schema-v2)<a href="https://agentmods.dev/skills/xiaoshiyilangzhao1996-droid/skill-schema-v2/skill-schema-v2"><img src="https://agentmods.dev/badge/skills/xiaoshiyilangzhao1996-droid/skill-schema-v2/skill-schema-v2/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/xiaoshiyilangzhao1996-droid/skill-schema-v2/skill-schema-v2"><img src="https://agentmods.dev/badge/skills/xiaoshiyilangzhao1996-droid/skill-schema-v2/skill-schema-v2.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00028 | $0.00506 |
| Opus 5.5 | $0.00011 | $0.00202 |
| Sonnet 5.5 | $0.00006 | $0.00101 |
| Haiku 4.5 | $0.00003 | $0.00051 |
Grade A, and why
skill-schema-v2 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 16d 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.
What it actually says
Skill Schema V2
This is the compatibility entrypoint for the v2 skill schema. The installable v2 package is in skill-schema-v2.skill/.
Use it when a user is designing, auditing, refactoring, or repairing an Agent Skill.
Core Rule
A skill has three surfaces:
Routing Surface: name + description + frontmatter
Contract Surface: goal + inputs + permissions + evidence + output + verification + handoff
Runtime Boundary Surface: docs + examples + scripts + operators + fallback paths
The three surfaces must be aligned. If the description routes one task, the contract must govern that task, and runtime resources must support that task without forcing irrelevant context into the model.
What Changed in v2
v2 adds three 2026 findings:
- Contractual Skills: skills should be readable task contracts with explicit boundaries and acceptance criteria.
- 138K SKILL.md reusability study: routing defects, body bloat, poor resources, safety issues, portability gaps, and persona/scope conflicts are measurable defects.
- SkillSmith: raw skill injection wastes context; skills should expose minimal runtime boundaries and load detail progressively.
Audit Output
When auditing, score out of 100:
| Area | Points |
|---|---|
| Routing | 15 |
| Contract | 20 |
| Runtime Boundary | 15 |
| Reusability | 15 |
| Safety | 15 |
| Signal Density | 10 |
| Versioning | 5 |
| Self-Consistency | 5 |
Runtime Resources
Load only as needed:
skill-schema-v2.skill/SKILL.mdfor the complete v2 contract.skill-schema-v2.skill/docs/v2-design-spec.mdfor design rationale.skill-schema-v2.skill/docs/audit-rubric.mdfor scoring details.skill-schema-v2.skill/docs/repair-playbook.mdfor repair patterns.docs/paper-digests.mdfor paper evidence.
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.
- 16d ago First seen · 63 lines · 28 tokens per session scan A a1cb6a848e95
skill-schema-v2 is a skill published in the GitHub repository xiaoshiyilangzhao1996-droid/Skill-Schema-V2 (16 stars, last pushed 4mo ago), licensed MIT. It adds 28 tokens to every session and 506 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-10-02.
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