Getting it into your agent
There is no command for this one: it runs only inside a plugin, and the catalogue could not identify which plugin ships it. The source is linked below.
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.
[](https://agentmods.dev/skills/athola/claude-night-market/claude-code-plugin-reference)<a href="https://agentmods.dev/skills/athola/claude-night-market/claude-code-plugin-reference"><img src="https://agentmods.dev/badge/skills/athola/claude-night-market/claude-code-plugin-reference.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 | $0.00041 | $0.07228 |
| Opus 5 | $0.00020 | $0.03614 |
| Sonnet 5 | $0.00008 | $0.01446 |
| Haiku 4.5 | $0.00004 | $0.00723 |
Grade A, and why
claude-code-plugin-reference 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 — 598 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Claude Code Plugin Reference (night-market edition)
This is the domain pack for how Claude Code plugin machinery works in this
repository. It covers manifests, skills, commands, agents, hooks, and the
marketplace registry, with the local conventions layered on top. Every
contract below was checked against a shipped plugin (mostly plugins/imbue,
plugins/abstract, and plugins/herald) on 2026-07-02 at repo v1.9.15.
When another night-market skill says "see the plugin reference for what a
hook payload is," this is the file it means.
Vocabulary
Each term is defined once here and used without redefinition below.
| Term | Meaning in this repo |
|---|---|
| Plugin | A directory under plugins/ shipping skills, commands, agents, and hooks, with its own tests, Makefile, and pyproject.toml. Independently deployable (ADR-0001). |
| Skill | A directory skills/<name>/ containing SKILL.md. Loaded by the model on demand, invoked as Skill(plugin:name). |
| Module | A file under a skill's modules/ subdirectory. Loaded only when the hub SKILL.md routes to it (progressive loading). |
| Command | A markdown file under commands/. Surfaces as a slash command the user types. Repo docs refer to the namespaced form, e.g. /sanctum:sync-capabilities. |
| Agent | A markdown file under agents/ defining a dispatchable subagent: frontmatter plus a system-prompt body. |
| Hook | An executable script Claude Code runs on a lifecycle event, registered in the plugin's hooks/hooks.json. |
| Hook event | The lifecycle point a hook fires on: PreToolUse, PostToolUse, Stop, SessionStart, UserPromptSubmit, and others (full table below). |
| Manifest | .claude-plugin/plugin.json: the file Claude Code reads to register a plugin's components. |
| Marketplace | The root .claude-plugin/marketplace.json registry listing all plugins, installed via /plugin marketplace add. |
| Plugin cache | The directory Claude Code copies installed plugins into and executes them from. It is NOT the repo checkout. |
${CLAUDE_PLUGIN_ROOT} |
Placeholder Claude Code expands to the plugin's cache path. The only safe way to reference plugin files from hooks. |
| Host Python | The system Python interpreter that runs hook scripts. Assume 3.9, even though plugin package code targets 3.12. |
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 · 598 lines · 41 tokens per session scan A 0a2173f6f0f2
claude-code-plugin-reference is a skill published in the GitHub repository athola/claude-night-market (335 stars, last pushed yesterday), licensed MIT. It adds 41 tokens to every session and 7,228 once invoked, about $0.0002 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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