Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add ivan-magda/claude-code-plugin-template/plugin install plugin-developmentWrote 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/ivan-magda/claude-code-plugin-template/plugin-authoring)<a href="https://agentmods.dev/skills/ivan-magda/claude-code-plugin-template/plugin-authoring"><img src="https://agentmods.dev/badge/skills/ivan-magda/claude-code-plugin-template/plugin-authoring/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/ivan-magda/claude-code-plugin-template/plugin-authoring"><img src="https://agentmods.dev/badge/skills/ivan-magda/claude-code-plugin-template/plugin-authoring.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00051 | $0.01584 |
| Opus 5.5 | $0.00020 | $0.00634 |
| Sonnet 5.5 | $0.00010 | $0.00317 |
| Haiku 4.5 | $0.00005 | $0.00158 |
Grade A, and why
plugin-authoring 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 1mo 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.
Copies of this mod
3 near-identical copies found in the catalogue:
- plugin-authoring — 98% identical, 4 lines differ
- plugin-authoring — 98% identical, 4 lines differ
- plugin-authoring — 98% identical, 4 lines differ
How it starts
The opening of the file, as written. The whole thing — 137 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Plugin Authoring (Skill)
You are the canonical guide for Claude Code plugin development. Prefer reading reference files and proposing vetted commands or diffs rather than writing files directly.
Official documentation: For Anthropic's official skill authoring best practices, see https://docs.claude.com/en/docs/agents-and-tools/agent-skills/best-practices
Triggers & Scope
Activate whenever context includes .claude-plugin/, plugin.json, marketplace.json, commands/, agents/, skills/, or hooks/.
Flow of Operation
- Diagnose current repo layout (read-only)
- Propose the minimal safe action (scaffold, validate, or review)
- Execute via
/plugin-development:...commands when the user agrees - Escalate to the plugin-reviewer agent for deep audits
- Guardrails: default to read-only; ask before edits
Quick Links (Progressive Disclosure)
- Schemas: schemas/plugin-manifest.md, schemas/hooks-schema.md, schemas/marketplace-schema.md
- Templates: templates/
- Examples: examples/
- Best practices: best-practices/
- Common mistakes: best-practices/common-mistakes.md
- Testing this skill: testing-plugin-authoring.md
Checklists
Component Checklist
□ .claude-plugin/plugin.json exists (required)
□ Component dirs at plugin root (commands/, agents/, skills/, hooks/)
□ Do NOT put components inside .claude-plugin/ directory
□ Commands use kebab-case naming
□ Skills have valid frontmatter (name + description required, optional: model, allowed-tools)
□ Skills name validation:
- Matches directory name
- Lowercase letters, numbers, hyphens only
- Max 64 characters
- No reserved words ('anthropic', 'claude')
- No XML tags
□ Hooks use ${CLAUDE_PLUGIN_ROOT} for paths (not relative paths)
□ All scripts are executable (chmod +x)
What ships with it
14 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.
- best-practices/common-mistakes.md 6.6 KB
- best-practices/naming-conventions.md 8.2 KB
- best-practices/organization.md 9.0 KB
- examples/simple-plugin.md 2.8 KB
- examples/testing-workflow.md 4.7 KB
- schemas/hooks-schema.md 13 KB
- schemas/marketplace-schema.md 10 KB
- schemas/plugin-manifest.md 9.6 KB
- templates/agent-template.md 1.3 KB
- templates/command-template.md 599 B
- templates/marketplace-manifest.json 563 B
- templates/plugin-manifest.json 407 B
- templates/skill-template.md 1.7 KB
- testing-plugin-authoring.md 5.9 KB
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.
- 1mo ago First seen · 137 lines · 51 tokens per session scan A 9772da518554
plugin-authoring is a skill published in the GitHub repository ivan-magda/claude-code-plugin-template (70 stars, last pushed 3mo ago), licensed MIT. It adds 51 tokens to every session and 1,584 once invoked, about $0.0002 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 2026-08-30.
Other skills, from other repositories
loongsuite-pilot-insight
A reporting workflow for turning LoongSuite Pilot and AI coding-agent logs into structured reports about events, teams, data quality, development efficiency, and AI use. It defines the meaning of the log fields and the measurements used in dashboards.
loongsuite-pilot-ops
Skill "loongsuite-pilot-ops" from alibaba/loongsuite-pilot, covering loongsuite-pilot-ops, quick start, todo: add quick start commands and usage.
atomic-visual-options
Planning-phase visual comparison aid. Renders 2-4 side-by-side variants per decision dimension as a single throwaway, self-contained HTML file and captures the user's pick as typed terminal codes (e.g. "A2 B3"). Auto-fires on phrases like "show me a few options", "mock up some variants", "let me see this side by…
sipcode-regress
Check the user's own local Claude Code and Codex logs for regressions after an update (prompt-cache misses, 5-minute cache TTL, uncached context, hourly cache rebuilds, Codex usage limit draining faster per token) and pin each one to the version that introduced it, using the Sipcode CLI. Use when the user asks whether…
atomic-wiki
Conversational wiki and capture-bucket routing. Fires when the user wants a place, space, or folder for notes, research, tickets, raw dumps, or knowledge capture — checks the block in /.claude/CLAUDE.md; if the cwd is under a registered realm, creates the folder as a bucket via atomic wiki bucket add rather than a…
atomic-review
Compressed code review comments. Cuts noise from PR feedback while preserving the actionable signal. Each comment is one line: location, problem, fix. Use when user says "review this PR", "code review", "review the diff", or invokes /atomic-review. Auto-triggers when reviewing pull requests.