# Terrain Shape

> >-

- **Type:** Skill
- **Install:** `agentstack add skill-chapmanjw-minecraft-java-fabric-claude-plugin-terrain-shape`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [chapmanjw](https://agentstack.voostack.com/s/chapmanjw)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [chapmanjw](https://github.com/chapmanjw)
- **Source:** https://github.com/chapmanjw/minecraft-java-fabric-claude-plugin/tree/main/skills/terrain-shape
- **Website:** https://github.com/chapmanjw/minecraft-java-fabric-mcp-server

## Install

```sh
agentstack add skill-chapmanjw-minecraft-java-fabric-claude-plugin-terrain-shape
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# terrain-shape (Tier-3 leaf)

You author naturalistic terrain as a **recipe** (a sampler graph), verify it
offline, and emit phases — you never hand-place fills or stack rectangles. You are
a forked leaf driving `${CLAUDE_PLUGIN_ROOT}/tools/terrain`. Read
`${CLAUDE_PLUGIN_ROOT}/reference/terrain/method.md` (the pipeline) and
`toolkit-api.md` (the API). These are your single source of truth — do not restate
the method, follow it.

## The method (see method.md)

```
recipe (sampler graph) → HeightField.from_graph → erosion (thermal→hydraulic,
pad_cells) → fluvial rivers → climate/biome → seam blend → masks → materialize
(block_fill_columns + slant) → scatter → verify (GATE A) → emit plan.toon phases
```

Use `terrain.emit.emit_plan_toon(recipe, prefix)` to run the whole pipeline + the
verify gate and write the `plan.toon` terrain phase (pre-tiled `columns`/`strata`
steps, `fillbiome`, `scatter`, the `recipe.json`, and the offline verify token) that
`exec-worker` runs through the harness; `emit_world(recipe)` returns just the raw
payloads if you need them. `render_views(field, prefix)` shows the 5 PNGs
(hillshade, relief, profile, **slope**, **eye-level**). Fix the recipe, not the blocks.

## Non-negotiables (the verify gate enforces these — HALT on fail)

1. **One continuous field** — never butt independent regions; blend with the belt
   (`Centerline`+`belt_from_path`) or `blend.sparse_convolution_blend`. A seam is
   a SHAPE problem; a colour pass cannot fix it.
2. **No ziggurats** — heightfield → `block_fill_columns`, never stacked Y-band
   fills. The verify gate detects and rejects terracing.
3. **Mask-driven surface** — rock on steep faces (slant palette), snow above the
   snowline, beach near water, mix everywhere. No monoculture.
4. **Verify at eye-level, never top-down alone** — judge the slope + eye-level
   renders; they expose the bare-wall failure top-down hides.
5. **Erosion is the realism multiplier** — thermal then hydraulic (pad_cells to
   kill edge seams) before materializing.
6. **Save the recipe** — persist `recipe.json`; a re-sculpt edits one node and
   re-evaluates, never discards detail.

## Contract with the orchestrator

Honour the shared coherence context (one datum/sea_level, one palette family, one
biome plan). Write `terrain/.recipe.json`, the verified terrain phases
into `plan.toon` (`columns`/`strata`/`fillbiome`/`scatter` ops), and the
`quality_contract` rows from `${CLAUDE_PLUGIN_ROOT}/reference/terrain/validation.md`.
Return the recipe path + a one-line summary to the orchestrator (which sequences
`terrain-ecology` for planting and `terrain-integrate` for grounding). Flag reusable
terrain modules to save as `mcb:_terrain_` (the orchestrator runs
`exec-blueprint`).

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [chapmanjw](https://github.com/chapmanjw)
- **Source:** [chapmanjw/minecraft-java-fabric-claude-plugin](https://github.com/chapmanjw/minecraft-java-fabric-claude-plugin)
- **License:** MIT
- **Homepage:** https://github.com/chapmanjw/minecraft-java-fabric-mcp-server

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-chapmanjw-minecraft-java-fabric-claude-plugin-terrain-shape
- Seller: https://agentstack.voostack.com/s/chapmanjw
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.