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 agent-development-oshankhz-cc-swiss-knife-3git 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/agent-development-oshankhz-cc-swiss-knife-3)<a href="https://agentmods.dev/skills/majiayu000/claude-skill-registry/agent-development-oshankhz-cc-swiss-knife-3"><img src="https://agentmods.dev/badge/skills/majiayu000/claude-skill-registry/agent-development-oshankhz-cc-swiss-knife-3/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/agent-development-oshankhz-cc-swiss-knife-3"><img src="https://agentmods.dev/badge/skills/majiayu000/claude-skill-registry/agent-development-oshankhz-cc-swiss-knife-3.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00104 | $0.01492 |
| Opus 5 | $0.00052 | $0.00746 |
| Sonnet 5 | $0.00021 | $0.00298 |
| Haiku 4.5 | $0.00010 | $0.00149 |
Grade A, and why
agent-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 9d 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 — 168 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Development for Claude Code Plugins
Agents are autonomous markdown files with YAML frontmatter that handle multi-step tasks independently. Agents are for autonomous work; commands are for user-initiated actions.
Workflow
- Define agent purpose and triggering conditions
- Create
agents/agent-name.mdwith frontmatter + system prompt body - Include 2-4
<example>blocks in description - Validate structure (see constraints below)
- Test triggering with real scenarios
- If validation fails: check error recovery table, fix, re-validate
Agent File Template
---
name: agent-identifier
description: Use this agent when [triggering conditions]. Examples:
<example>
Context: [Situation]
user: "[Request]"
assistant: "[Response before triggering]"
<commentary>[Why this agent triggers]</commentary>
</example>
model: inherit
color: blue
tools: ["Read", "Write", "Grep"]
---
You are [role] specializing in [domain].
**Your Core Responsibilities:**
1. [Primary task]
2. [Secondary task]
**Process:**
1. [Step 1]
2. [Step 2]
**Output Format:**
[What to return and how]
**Edge Cases:**
- [Case]: [How to handle]
Frontmatter Reference
| Field | Required | Format | Constraints |
|---|---|---|---|
name |
Yes | lowercase-hyphens |
3-50 chars, start/end alphanumeric, no underscores |
description |
Yes | Text + <example> blocks |
10-5000 chars, must include triggering conditions |
model |
Yes | inherit|sonnet|opus|haiku |
Use inherit unless specific need |
color |
Yes | blue|cyan|green|yellow|magenta|red |
Distinct per plugin |
tools |
No | Array of tool names | Least-privilege principle; default: all tools |
hooks |
No | Array of hook configs | See hooks section |
disallowedTools |
No | Array with Task(AgentName) |
Prevents specific agents from running |
Color conventions: blue/cyan = analysis/review, green = success, yellow = validation, red = security, magenta = creative.
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.
- 9d ago First seen · 168 lines · 104 tokens per session scan A e7cd80785283
agent-development is a skill published in the GitHub repository majiayu000/claude-skill-registry (606 stars, last pushed today), licensed MIT. It adds 104 tokens to every session and 1,492 once invoked, about $0.0005 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 2026-09-03.
Other skills, from other repositories
remotion-docs
Search and fetch Remotion documentation pages.
remotion-captions
Dealing with captions in Remotion.
remotion-render
Best practices for rendering videos.
academy-guide
Stop and check this skill before finishing any reply to a question about how to use Claude or a Claude product — it recommends matching courses, tutorials, and use cases from Claude Academy (academy.claude.com), Anthropic's learning hub. Trigger on: "how do I", "how can I", "getting started with", "what can Claude…
remotion-maps
Remotion Map animation knowledge.
mediabunny
Multimedia handling with the Mediabunny library.