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.
curl -O https://raw.githubusercontent.com/Txpple/fvtt-mcp-molten5e/main/.claude/skills/stat-block-builder/SKILL.mdgit clone --depth 1 https://github.com/Txpple/fvtt-mcp-molten5eWrote 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/txpple/fvtt-mcp-molten5e/stat-block-builder)<a href="https://agentmods.dev/skills/txpple/fvtt-mcp-molten5e/stat-block-builder"><img src="https://agentmods.dev/badge/skills/txpple/fvtt-mcp-molten5e/stat-block-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.
<a href="https://agentmods.dev/skills/txpple/fvtt-mcp-molten5e/stat-block-builder"><img src="https://agentmods.dev/badge/skills/txpple/fvtt-mcp-molten5e/stat-block-builder.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 | $0.00241 | $0.04916 |
| Opus 5 | $0.00120 | $0.02458 |
| Sonnet 5 | $0.00048 | $0.00983 |
| Haiku 4.5 | $0.00024 | $0.00492 |
Grade A, and why
stat-block-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 9d 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 — 258 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Complete-NPC builder
A judgment layer over the actor-authoring tools. It turns a stat block (pasted text, a Monster Manual entry, or a freeform description) into a fully-built, ready-to-play Foundry NPC — base stats, defenses, senses, special traits, actions, spellcasting, effects, its full inventory and loot, biography, and a finishing pass — by sequencing the right tool calls. It adds NO new mechanics; every tool it calls holds its own correctness.
Tools used: create-actor-from-compendium (prefab copy · prefab-as-base via modifications), author-npc (authored from scratch), update-actor, add-feature (features /
compendium-features / spells), import-item (COPY gear from a compendium — the default for
inventory), add-item (author homebrew gear — last resort), manage-activity, manage-effect,
apply-condition, set-actor-art, set-actor-ownership, move-documents, update-actor-item
(per-item corrections), the faceted discovery tools search-compendium-creatures /
search-compendium-spells / search-compendium-items (find things to copy by type + facet —
each searches the premium books only and never the SRD, so you don't reason about pack ids),
search-compendium (broad name lookup) / get-compendium-entry (full entry), plus get-actor /
get-actor-entity to read back. Defer item judgment to the [[physical-item-builder]] skill.
Faceted discovery returns minimal hits.
search-compendium-creatures/-spells/-itemseach returnresults: [{ id, name, type, uuid, pack, packLabel, img, facets }], premium-first ranked. Pick a hit by name, then feed itspack+idstraight intocreate-actor-from-compendium,import-item, orget-compendium-entry— no pack-id guesswork.
add-featureinvocation shape. It takes a top-levelmode— onlyfeature,compendium-features, oritems— plus nested params. Authoring any single feature/attack/save/aura/spellcasting/spells/homebrew-spell ismode: "feature"withfeature.featureTypeset to that value (e.g.mode:"feature",feature.featureType:"save"); importing named features ismode: "compendium-features"withcompendiumFeatures.featureNames. Below, shorthand like "add-featuresave" always means thatmode:"feature"+feature.featureTypeform —featureTypeis NOT a top-level mode.
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.
- 9d ago First seen · 258 lines · 241 tokens per session scan A 886067dec2fb
stat-block-builder is a skill published in the GitHub repository Txpple/fvtt-mcp-molten5e (0 stars, last pushed 8d ago), licensed MIT. It adds 241 tokens to every session and 4,916 once invoked, about $0.0012 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 2026-08-31.
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