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 YoungjaeDev/my-claude-plugins/plugin install deckWrote 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/youngjaedev/my-claude-plugins/deck-check)<a href="https://agentmods.dev/skills/youngjaedev/my-claude-plugins/deck-check"><img src="https://agentmods.dev/badge/skills/youngjaedev/my-claude-plugins/deck-check/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/youngjaedev/my-claude-plugins/deck-check"><img src="https://agentmods.dev/badge/skills/youngjaedev/my-claude-plugins/deck-check.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 | $0.00161 | $0.01719 |
| Opus 5.5 | $0.00064 | $0.00688 |
| Sonnet 5.5 | $0.00032 | $0.00344 |
| Haiku 4.5 | $0.00016 | $0.00172 |
Grade B, and why
deck-check scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
found=$(find "$HOME/.claude/plugins/cache" "${CODEX_PLUGIN_CACHE:-$HOME/.codex/plugins/cache}" \ How it starts
The opening of the file, as written. The whole thing — 93 lines — stays where its author put it; the contents beside it link to each section on GitHub.
deck-check
Overview
One QA pass over a house-format deck. Every tool runs from the plugin, against ./deck and the repo's .claude/rules/. Output is a short report: slide count, copy violations, rule-copy status, render and interaction status, and what the rendered PNGs show.
When to use
- After editing sections,
shell.html, motions or assets, and always beforedeck-deploy. - When the user asks whether the deck builds, whether copy rules pass, or whether rule copies are current.
- Not for a deck that lacks
deck/shell.html+deck/sections/(that is not the house format).
Procedure
Shell state does not persist between tool calls. Put this resolver at the top of every command block below.
PLUGIN_ROOT="${PLUGIN_ROOT:-${CLAUDE_PLUGIN_ROOT:-}}"
[ -z "$PLUGIN_ROOT" ] && [ -f plugins/deck/scripts/kit.py ] && PLUGIN_ROOT=plugins/deck
if [ -z "$PLUGIN_ROOT" ]; then
# find, not a glob: zsh aborts on an unmatched glob and does not split an unquoted list.
found=$(find "$HOME/.claude/plugins/cache" "${CODEX_PLUGIN_CACHE:-$HOME/.codex/plugins/cache}" \
-mindepth 3 -maxdepth 3 -type d -path '*/deck/*' 2>/dev/null | awk -F/ '{print $NF "\t" $(0)}')
if sort -V </dev/null >/dev/null 2>&1; then
PLUGIN_ROOT=$(printf '%s\n' "$found" | sort -V | tail -1 | cut -f2-)
else
PLUGIN_ROOT=$(printf '%s\n' "$found" | sort -t. -k1,1n -k2,2n -k3,3n | tail -1 | cut -f2-)
fi
fi
[ -f "$PLUGIN_ROOT/scripts/kit.py" ] || { echo "deck plugin scripts not found; export PLUGIN_ROOT=<path to plugins/deck>"; exit 1; }
PY=$(command -v python3 || command -v python)
-
Build, copy check, rule copies. Run from the repo root (the directory that holds
deck/).# resolver block above goes here # Run every check even after a failure, then fail the block if any of them failed. rc=0 "$PY" "$PLUGIN_ROOT/scripts/build.py" deck || rc=1 "$PY" "$PLUGIN_ROOT/scripts/check_copy.py" deck || rc=1 "$PY" "$PLUGIN_ROOT/scripts/kit.py" check . || rc=1 [ "$rc" -eq 0 ]
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.
- today Changed 4c241d5ade69
- 13d ago First seen · 93 lines · 161 tokens per session scan B fb297b7013ac
deck-check is a skill published in the GitHub repository YoungjaeDev/my-claude-plugins (2 stars, last pushed yesterday), licensed MIT. It adds 161 tokens to every session and 1,719 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-06.
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