What is plugin-structure-guide?

A guide to the structure of a coding-agent plugin, including its files and the process for adding skills. It describes creating a skill file and registering it in plugin.json.

Use it when learning the plugin file structure or adding a new skill. Its documented workflow starts with creating skill.md and then updating plugin.json.

It helps plugin authors know where components belong and how a new skill becomes part of the plugin. The input does not describe validation or automatic generation.

plugin-structure-guide — Skill by karak

Install

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.

agentmods

npx agentmods add skills/karak/karak-claude-plugin/plugin-structure-guide

Any agent

npx skills add karak/karak-claude-plugin --skill plugin-structure-guide

Clone the repo

git clone --depth 1 https://github.com/karak/karak-claude-plugin

Made for: Claude Code, Codex.

Per session 71 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,254 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin unknown No closer match found in the catalogue.

Token cost

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	$0.00071	$0.01254
Opus 5	$0.00036	$0.00627
Sonnet 5	$0.00014	$0.00251
Haiku 4.5	$0.00007	$0.00125

Measured 2d ago against content hash 87d2902040ae, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

plugin-structure-guide 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.

.claude/skills/plugin-structure-guide/SKILL.md · 120 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

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.

agents/openai.yaml 114 B

Changes

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 · 120 lines · 71 tokens per session scan A 87d2902040ae

Subscribe to this mod's changes

plugin-structure-guide is a skill published in the GitHub repository karak/karak-claude-plugin (4 stars, last pushed 12d ago), with no licence file. It adds 71 tokens to every session and 1,254 once invoked, about $0.0004 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 2026-08-31.

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