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 agentmods add rules/vibeeval/vibecosystem/skill-developmentgit clone --depth 1 https://github.com/vibeeval/vibecosystemWhat 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 | $0.00000 | $0.00237 |
| Opus 5 | $0.00000 | $0.00118 |
| Sonnet 5 | $0.00000 | $0.00047 |
| Haiku 4.5 | $0.00000 | $0.00024 |
Grade A, and why
skill-development 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 2d 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 Development Rules
Skill Directory Structure
Each skill lives in its own directory under skills/:
skills/
coding-standards/
SKILL.md # Skill metadata + trigger description
prompt.md # Full skill content
SKILL.md Format
---
name: skill-name
description: When and why to use this skill. Used for auto-discovery.
---
Followed by the skill content in Markdown.
prompt.md Format
The full prompt/knowledge content. No frontmatter needed.
Naming Conventions
- Directory name:
kebab-case(e.g.,coding-standards) - SKILL.md name field: same as directory name
- Description: explains WHEN to trigger, not just WHAT it does
Quality Rules
- Description must clearly indicate trigger conditions
- Content should be actionable, not theoretical
- Include code examples where applicable
- Keep skills focused on one domain/topic
- Cross-reference related skills in content
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.
- 2d ago First seen · 46 lines · 0 tokens per session scan A 0624159981e0
skill-development is a cursor rule published in the GitHub repository vibeeval/vibecosystem (530 stars, last pushed 24d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 237 tokens. 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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