What is cards-builder?

A builder for playable card decks in Foundry VTT, including themed decks and standard playing cards. It creates cards with names, optional text, and optional artwork.

Use it to make encounter, event, fate, initiative, tarokka, or Deck of Many Things cards, or to import a standard preset deck.

It structures card content for use during a game while leaving the card choices and wording to you. It also supports Foundry's built-in preset decks.

How Txpple/fvtt-mcp-molten5e configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Txpple/fvtt-mcp-molten5e. 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/Txpple/fvtt-mcp-molten5e/main/.claude/skills/cards-builder/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/Txpple/fvtt-mcp-molten5e

Made for: Claude Code.

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/txpple/fvtt-mcp-molten5e/cards-builder/github.svg)](https://agentmods.dev/skills/txpple/fvtt-mcp-molten5e/cards-builder)

Your own site

<a href="https://agentmods.dev/skills/txpple/fvtt-mcp-molten5e/cards-builder"><img src="https://agentmods.dev/badge/skills/txpple/fvtt-mcp-molten5e/cards-builder/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/txpple/fvtt-mcp-molten5e/cards-builder"><img src="https://agentmods.dev/badge/skills/txpple/fvtt-mcp-molten5e/cards-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 195 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,478 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 original 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	$0.00195	$0.01478
Opus 5.5	$0.00078	$0.00591
Sonnet 5.5	$0.00039	$0.00296
Haiku 4.5	$0.00019	$0.00148

Measured 2mo ago against content hash a5e543960d6f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cards-builder 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/cards-builder/SKILL.md · 100 lines

How it starts

The opening of the file, as written. The whole thing — 100 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Cards builder

The judgment + content layer for playable cards (design.md §5) — Foundry card stacks (decks, hands, piles) for in-play use: a Deck of Many Things, a tarokka deck, an encounter/fate deck, a standard deck of cards. As with every authoring skill: you decide; the tool does.

The line that matters — yours vs the tool's

You (this skill) decide the deck's CONTENTS — which cards, each card's name, its face text (the outcome/effect/flavor), and which art it uses. That judgment IS the job.
The tool only STRUCTURES — create-cards renders your cards into the v14 Cards/Card shape (one face per card: { name, text?, img? }); import-cards instantiates a core preset deck. Neither invents a card.

Authoring policy — what compendium-first means HERE

Read _shared/authoring-policy.md. The big clarification for cards:

Cards have NO premium-book compendium (the MM/PHB/DMG ship no card decks). So compendium-first is N/A — decks are asset-driven, like scenes: the card art is an uploaded image asset, and the face text is yours to write. There is no "copy the book deck" path; import-cards only instantiates Foundry's built-in preset decks (a standard 52-card deck).
Don't fabricate canon. A famous deck's contents ARE canonical — the Deck of Many Things card list and its effects come from the DMG; transcribe them, don't invent new cards or outcomes. If the user wants a deck of content you don't have, STOP and ASK rather than making it up. Custom/themed decks (an event deck for your adventure) are yours to author.

Tools

create-cards — the structuring creator (your main tool). { name, type?, description?, folderName?, cards?: [{ name, text?, img? }] }. Builds a stack with one face per card.
import-cards — instantiate a core preset deck ({ preset, name?, folderName? }), e.g. pokerDark / pokerLight (a standard 52-card deck). The ready-made-deck path.
list-cards — list stacks + ids (deck/hand/pile, card count).
delete-cards — remove stacks by exact id/name (strict).

Read the full file on GitHub · 100 lines

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 · 100 lines · 195 tokens per session scan A a5e543960d6f

Subscribe to this mod's changes

cards-builder is a skill published in the GitHub repository Txpple/fvtt-mcp-molten5e (0 stars, last pushed 1mo ago), licensed MIT. It adds 195 tokens to every session and 1,478 once invoked, about $0.0008 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.

Game development

cards-builder next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
cards-builderTxpple/fvtt-mcp-molten5e	Skill	0	1mo ago	MIT	A	195	Claude Code
playtest-reportDonchitos/Claude-Code-Game-Studios	Skill	36k	19d ago	MIT	A	20	Claude Code
godot-signals-groupsgamedev-skills/awesome-gamedev-agent-skills	Skill	7.4k	10d ago	Apache-2.0	A	95	Claude Code
texture-workflowarjun988/blender-skills	Skill	2.0k	yesterday	MIT	A	41	Claude Code
scenario-unreal-gameplayscenario-labs/skills	Skill	3.5k	today	MIT	A	121	Claude Code
motionOpenDCAI/GameFactory-3A	Skill	1.0k	9d ago	Apache-2.0	A	0	Claude Code, Codex
unity-addressablesBesty0728/Unity-Skills	Skill	1.9k	today	MIT	A	25	Claude Code, Codex

fvtt-mcp-molten5e: Skill for Claude Code