What is building-with-schematics?

A method for describing Minecraft structures as JSON schematics: grids of layers that specify which blocks go where. The server turns that description into the building actions, including block directions and rotations.

Use it to build Minecraft floors, walls, rooms, and other structures from structured descriptions, including builds that need block states or rotation.

It lets you describe the intended shape without writing individual game commands, while compact patterns reduce the amount of text needed for repeated walls, floors, and rooms.

building-with-schematics — Skill for Claude Code by amenti-labs

Install

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.

Any agent

npx skills add amenti-labs/vibecraft --skill building-with-schematics

Clone the repo

git clone --depth 1 https://github.com/amenti-labs/vibecraft

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/amenti-labs/vibecraft/building-with-schematics/github.svg)](https://agentmods.dev/skills/amenti-labs/vibecraft/building-with-schematics)

Your own site

<a href="https://agentmods.dev/skills/amenti-labs/vibecraft/building-with-schematics"><img src="https://agentmods.dev/badge/skills/amenti-labs/vibecraft/building-with-schematics/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/amenti-labs/vibecraft/building-with-schematics"><img src="https://agentmods.dev/badge/skills/amenti-labs/vibecraft/building-with-schematics.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,438 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	$0.00070	$0.04438
Opus 5	$0.00035	$0.02219
Sonnet 5	$0.00014	$0.00888
Haiku 4.5	$0.00007	$0.00444

Measured 12d ago against content hash 36c84a87c2b8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

building-with-schematics 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 12d 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.

agent/.claude/skills/building-with-schematics/SKILL.md · 407 lines

How it starts

The opening of the file, as written. The whole thing — 407 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Building with Schematics

Why Schematics?

Schematics are the PREFERRED building method because:

You describe WHAT to build, not HOW to execute commands
Full block state support (facing, axis, half, etc.)
COMPACT FORMAT saves ~70% tokens with run-length encoding
Automatic rotation of entire builds
Optimizes commands automatically

COMPACT FORMAT (Recommended)

Use this format for token efficiency:

{
  "a": [x, y, z],
  "p": {"S": "stone", "P": "oak_planks", ".": "air"},
  "l": [
    [0, "S*10|S P*8 S~8|S*10"]
  ]
}

Compact Syntax:

Short keys: "a" (anchor), "p" (palette), "l" (layers), "f" (facing)
Layers: [y_offset, "row|row|row"] - pipe separates rows
Layer range: ["1-3", "pattern"] - same pattern at y=1, y=2, y=3 (great for walls!)
Run-length: S*5 = 5 S blocks in a row
Row repeat: S P*3 S~8 = repeat this row pattern 8 times

Compact Examples:

10x10 floor with border (verbose: ~500 tokens, compact: ~50 tokens):

{"a": [0,64,0], "p": {"S": "stone", "P": "planks"}, "l": [[0, "S*10|S P*8 S~8|S*10"]]}

5x5x4 hollow room (with layer range for walls):

{
  "a": [100, 64, 200],
  "p": {"W": "oak_planks", ".": "air"},
  "l": [
    [0, "W*5~5"],
    ["1-2", "W*5|W .*3 W~3|W*5"],
    [3, "W*5~5"]
  ]
}

Note: ["1-2", "..."] creates identical layers at y=1 AND y=2. Great for multi-story walls!

Verbose Format (Backward Compatible)

{
  "anchor": [x, y, z],
  "facing": "north",
  "mode": "replace",
  "palette": {"<symbol>": "<block>[states]{nbt}"},
  "layers": [
    {"y": 0, "grid": [["S","S"],["S","S"]]}
  ]
}

Grid Convention

        North (-Z)
           ^
    Row 0  |
    Row 1  |
    Row 2  v
        South (+Z)

    Col0 Col1 Col2
    <--- West    East --->
    (-X)         (+X)

grid[row][col] = grid[z][x]
Row 0 is the NORTH edge
Column 0 is the WEST edge
Rows increase going SOUTH
Columns increase going EAST

Read the full file on GitHub · 407 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.

12d ago First seen · 407 lines · 70 tokens per session scan A 36c84a87c2b8

Subscribe to this mod's changes

building-with-schematics is a skill published in the GitHub repository amenti-labs/vibecraft (98 stars, last pushed 7mo ago), licensed MIT. It adds 70 tokens to every session and 4,438 once invoked, about $0.0003 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.

Game development

gameobject-component-destroy

Destroy one or more Components from a target GameObject. Missing (null) components are skipped — they cannot be destroyed. Use 'gameobject-find' and 'gameobject-component-get' to identify the components first.

IvanMurzak/Unity-MCP · 49 tokens

unity-version-split

Split a C# file into Unity 6.5+ and pre-Unity 6.5 variants. Use when a file needs different implementations for different Unity versions due to API changes (e.g., EntityId vs int, GetEntityId vs GetInstanceID).

IvanMurzak/Unity-MCP · 59 tokens

godot-signals-groups

Build event-driven, decoupled Godot 4.7 gameplay with signals and node groups: declare and emit custom signals, connect with Callables (incl. bind/one-shot), and broadcast to many nodes via groups and callgroup. Use when wiring node communication in a Godot project, replacing tight references with signals…

gamedev-skills/awesome-gamedev-agent-skills · 95 tokens

building-with-schematics