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.

How karak/karak-claude-plugin configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to karak/karak-claude-plugin. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/karak/karak-claude-plugin/main/.claude/skills/plugin-structure-guide/SKILL.md

Clone the repo

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

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/karak/karak-claude-plugin/plugin-structure-guide/github.svg)](https://agentmods.dev/skills/karak/karak-claude-plugin/plugin-structure-guide)

Your own site

<a href="https://agentmods.dev/skills/karak/karak-claude-plugin/plugin-structure-guide"><img src="https://agentmods.dev/badge/skills/karak/karak-claude-plugin/plugin-structure-guide/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/karak/karak-claude-plugin/plugin-structure-guide"><img src="https://agentmods.dev/badge/skills/karak/karak-claude-plugin/plugin-structure-guide.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

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. A grade says what 26 rules found in the file — not that it is safe.

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 5.1	$0.00071	$0.01254
Opus 5.5	$0.00028	$0.00502
Sonnet 5.5	$0.00014	$0.00251
Haiku 4.5	$0.00007	$0.00125

Measured 2mo ago against content hash 87d2902040ae, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 2mo 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.

2mo 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 (7 stars, last pushed 2mo ago), with no licence file. It adds 71 tokens to every session and 1,254 once invoked, about $0.0003 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 2026-08-31.

Building agents

plugin-structure-guide next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
plugin-structure-guidekarak/karak-claude-plugin	Skill	7	2mo ago	none	A	71	Claude Code, Codex
imagegenopenai/codex	Skill	134k	today	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	today	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	today	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	314k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	103	Claude Code

karak-claude-plugin: Skill for Claude Code