Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/chapmanjw/minecraft-java-fabric-claude-plugin/exec-plannpx skills add chapmanjw/minecraft-java-fabric-claude-plugin --skill exec-plangit clone --depth 1 https://github.com/chapmanjw/minecraft-java-fabric-claude-pluginWhat 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 | $0.00074 | $0.03681 |
| Opus 5 | $0.00037 | $0.01840 |
| Sonnet 5 | $0.00015 | $0.00736 |
| Haiku 4.5 | $0.00007 | $0.00368 |
Grade A, and why
exec-plan 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 2d 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 — 284 lines — stays where its author put it; the contents beside it link to each section on GitHub.
exec-plan (Planner)
You turn a build request into a plan precise enough that the exec-worker skill —
running on a small model — can execute it without making a single design
decision. Every choice is yours; the worker only places what you specify.
Some build types have their own planning specialists, owned by the orchestrator
that sequenced you. When the request is really one of these, say so in your
handback and return to the orchestrator rather than planning it here: a player's
base of operations (a house, survival base, treehouse) → the design-house
skill; a settlement up to ~15 buildings (a hamlet, village, trading hub) →
the design-village skill; a city or district (~16+ buildings, a metropolis)
→ the design-city skill; a specific named building or replica (a real-world
landmark, a building from fiction, an "in the style of" request) → the
design-building skill; a contraption or working machine (redstone, an
automatic farm, a sorter, a door, a minecart system) → the system-redstone
skill; a monument or build-art (a statue, sculpture, giant creature, pixel
art, mural, logo) → the design-monument skill; a designed outdoor space (a
formal garden, park, plaza, courtyard, hedge maze) → the design-grounds skill;
a transit network linking two or more sites (rail, roads, a nether hub, a
bridge or tunnel between places) → the system-transit skill. The orchestrator
routes to the right specialist; each runs an adaptive interview and iterates with
the user.
Inputs
Before planning, gather what exists:
- The user's request.
.minecraft-builder/<project>/survey.toon, ifsurvey-siteran — real terrain, ground level, buildable area, obstructions..minecraft-builder/<project>/research.mdandresearch.toon, ifsurvey-researchran — real-world dimensions and signature details.- The
mcbuilder:registryfrom command storage (read withdata_storage_get, namespacemcbuilder, pathregistry) — existing builds, in case this is an iteration on one.
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.
- 2d ago First seen · 284 lines · 74 tokens per session scan A aa624e83566e
exec-plan is a skill published in the GitHub repository chapmanjw/minecraft-java-fabric-claude-plugin (6 stars, last pushed 5d ago), licensed MIT. It adds 74 tokens to every session and 3,681 once invoked, about $0.0004 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.
Other skills, from other repositories
minecraft-dev
Use this skill whenever the user wants to look up Minecraft source, mod source, mod loader source, mappings, registries, versions, version differences, access transformers, mixin information, documentation, or code search results with minecraft-dev-cli. Also use it for Fabric, Forge, Quilt, and NeoForge source lookups.
ashfox
Create, edit, review, animate, and export game-ready low-poly assets in the ashfox web workbench through an AI agent. Use for low-poly modeling, deterministic textures and UVs, rigs, idle or motion animation, GLB, Bedrock, or GeckoLib exports, and Blockbench-free asset production.
1211-neoforge-modding
Minecraft 1.21.1 NeoForge Moddingに関する開発支援。Modの新規作成、Block/Item/Entityの追加、 DataGen、ネットワーク処理（Payload System）、レシピ・進捗・ルートテーブルの生成、 Capability/Data Component/Data Attachmentの実装、クラッシュ対応など。 Minecraft 1.21.1 NeoForge Moddingに関するタスクや、ModDevGradleのセットアップ、 Registry/Event/sidednessに関する質問があった際に使用する。.
1201-forge-modding
Minecraft 1.20.1 Forge Moddingに関する開発支援。Modの新規作成、Block/Item/Entityの追加、 DataGen、ネットワーク処理、レシピ・進捗・ルートテーブルの生成、Capabilityの実装、 クラッシュ対応など。Minecraft 1.20.1 Moddingに関するタスクや、Gradle/MDKのセットアップ、 Registry/Event/sidednessに関する質問があった際に使用する。.
1201-mods-exsample
Minecraft 1.20.1 Forge Moddingにおける実践的な実装パターン集。 エネルギー・GUI・ネットワーク・マルチブロック・レシピ・レンダリング・ スペル/AI/スクリプトなどの設計パターンを、17の主要Modの実装から抽出して解説。 Addon作成に使える部分は各Modトピックとして維持しつつ、Modに依存しない アーキテクチャ知識として整理する。.
1211-mods-exsample
Minecraft 1.21.1 NeoForge Moddingにおける実践的な実装パターン集。 エネルギー・GUI・ネットワーク・マルチブロック・レシピ・レンダリング・ スペル/AI/スクリプトなどの設計パターンを、16の主要Modの実装から抽出して解説。 Forge 1.20.1 → NeoForge 1.21.1 の移行差分（Data Component・Payload System・ Data Attachment）を加味したNeoForge版パターン集。.