Borrowing it
Nothing to install: this file belongs to johnkozaris/jko-claude-plugins. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/johnkozaris/jko-claude-plugins/main/CLAUDE.mdgit clone --depth 1 https://github.com/johnkozaris/jko-claude-pluginsWrote 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/instructions/johnkozaris/jko-claude-plugins/claude-md)<a href="https://agentmods.dev/instructions/johnkozaris/jko-claude-plugins/claude-md"><img src="https://agentmods.dev/badge/instructions/johnkozaris/jko-claude-plugins/claude-md.svg" alt="Measured on agentmods" 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 | $0.00832 | $0.00832 |
| Opus 5 | $0.00416 | $0.00416 |
| Sonnet 5 | $0.00166 | $0.00166 |
| Haiku 4.5 | $0.00083 | $0.00083 |
Grade A, and why
jko-claude-plugins CLAUDE.md 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 7d 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 — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.
jko-skills
Multi-CLI plugin marketplace with specialized skills and integrations.
Project Structure
myClaudeSkills/
├── .github/plugin/marketplace.json # GitHub Copilot CLI marketplace manifest
├── .claude-plugin/marketplace.json # Symlink to the Copilot marketplace manifest
├── plugins/
│ ├── backend-architecture/ # Small cross-stack architecture guide
│ ├── code-cleanup/ # Evidence-first dead-island and split-brain cleanup
│ ├── swiftui/ # SwiftUI-specific judgment
│ ├── esp32-cpp/ # ESP32 hardware/runtime judgment
│ ├── backend-validator/ # Token acquisition + HTTP/WS validation (hurl, oauth2c, websocat)
│ ├── peekaboo-macos-validator/ # macOS app UI validation via peekaboo CLI
│ ├── electron-playwright-validator/ # Electron app validation via persistent CDP session (e-cli)
│ ├── maestro-mobile-validator/ # iOS/Android flow validation via Maestro
│ └── seam-probe/ # FFI dylib / UDS seam probing (Rust CLI built on demand)
Installing This Marketplace
# Register as a marketplace for local development
claude plugin marketplace add "$PWD"
# Then install any plugin from the local checkout
claude plugin install <plugin-name>@jko-skills
After publishing or updating the GitHub-hosted marketplace, end users should use:
claude plugin marketplace add johnkozaris/jko-claude-plugins
claude plugin install <plugin-name>@jko-skills
Or load a single plugin for one session:
claude --plugin-dir "$PWD/plugins/<plugin-name>"
Local Iteration
- In Claude Code, run
/reload-pluginsafter installing, enabling, disabling, or updating plugins in the current session. - In GitHub Copilot CLI, reinstall a local plugin after edits because installed plugins are cached.
Conventions
- Before committing plugin changes, run
python3 scripts/lint-plugins.py(no CI — local only) and include its output. It checks description length limits, pattern-ID citation drift (CODE-/ARCH-/AP-/DN-), marketplace↔plugin.json version sync, orphaned reference files, private project-name leakage, empty hooks stubs, and dangling slash-command references. - Never name private projects in plugin content — plugins must be app-agnostic (app specifics go in env vars, manifests, or arguments). The linter's
PRIVATE_NAMESblocklist enforces this. - When a plugin's content changes substantively, bump its version in BOTH plugin.json files and BOTH marketplace.json files (the linter catches mismatches).
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.
- 7d ago First seen · 68 lines · 832 tokens per session scan A edc4ae827247
jko-claude-plugins CLAUDE.md is an instructions file published in the GitHub repository johnkozaris/jko-claude-plugins (11 stars, last pushed 10d ago), licensed MIT. It adds 832 tokens to every session, about $0.0042 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 2026-08-30.
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