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 skills/summersec/sumsec-skills/plugin-structurenpx skills add SummerSec/SumSec-Skills --skill plugin-structuregit clone --depth 1 https://github.com/SummerSec/SumSec-SkillsWhat 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 | $0.00093 | $0.03218 |
| Opus 5 | $0.00046 | $0.01609 |
| Sonnet 5 | $0.00019 | $0.00644 |
| Haiku 4.5 | $0.00009 | $0.00322 |
Grade A, and why
plugin-structure 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.
This is a copy
100% identical to Plugin Structure — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 477 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Plugin Structure for Claude Code
Overview
Claude Code plugins follow a standardized directory structure with automatic component discovery. Understanding this structure enables creating well-organized, maintainable plugins that integrate seamlessly with Claude Code.
Key concepts:
- Conventional directory layout for automatic discovery
- Manifest-driven configuration in
.claude-plugin/plugin.json - Component-based organization (commands, agents, skills, hooks)
- Portable path references using
${CLAUDE_PLUGIN_ROOT} - Explicit vs. auto-discovered component loading
Directory Structure
Every Claude Code plugin follows this organizational pattern:
plugin-name/
├── .claude-plugin/
│ └── plugin.json # Required: Plugin manifest
├── commands/ # Slash commands (.md files)
├── agents/ # Subagent definitions (.md files)
├── skills/ # Agent skills (subdirectories)
│ └── skill-name/
│ └── SKILL.md # Required for each skill
├── hooks/
│ └── hooks.json # Event handler configuration
├── .mcp.json # MCP server definitions
└── scripts/ # Helper scripts and utilities
Critical rules:
- Manifest location: The
plugin.jsonmanifest MUST be in.claude-plugin/directory - Component locations: All component directories (commands, agents, skills, hooks) MUST be at plugin root level, NOT nested inside
.claude-plugin/ - Optional components: Only create directories for components the plugin actually uses
- Naming convention: Use kebab-case for all directory and file names
Plugin Manifest (plugin.json)
The manifest defines plugin metadata and configuration. Located at .claude-plugin/plugin.json:
Required Fields
{
"name": "plugin-name"
}
Name requirements:
- Use kebab-case format (lowercase with hyphens)
- Must be unique across installed plugins
- No spaces or special characters
- Example:
code-review-assistant,test-runner,api-docs
What ships with it
6 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.
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 · 477 lines · 93 tokens per session scan A a2dbc1e5502a
plugin-structure is a skill published in the GitHub repository SummerSec/SumSec-Skills (8 stars, last pushed 18d ago), licensed Apache-2.0. It adds 93 tokens to every session and 3,218 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to Plugin Structure, differing in 2 lines, and is treated as a copy.
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