Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add chapmanjw/minecraft-java-fabric-claude-plugin/plugin install minecraft-javaWrote 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/chapmanjw/minecraft-java-fabric-claude-plugin/terrain-landmark)<a href="https://agentmods.dev/skills/chapmanjw/minecraft-java-fabric-claude-plugin/terrain-landmark"><img src="https://agentmods.dev/badge/skills/chapmanjw/minecraft-java-fabric-claude-plugin/terrain-landmark/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/chapmanjw/minecraft-java-fabric-claude-plugin/terrain-landmark"><img src="https://agentmods.dev/badge/skills/chapmanjw/minecraft-java-fabric-claude-plugin/terrain-landmark.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 | $0.00094 | $0.00670 |
| Opus 5 | $0.00047 | $0.00335 |
| Sonnet 5 | $0.00019 | $0.00134 |
| Haiku 4.5 | $0.00009 | $0.00067 |
Grade A, and why
terrain-landmark 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 8d 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 — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.
terrain-landmark (Tier-3 leaf)
You compose recognizable natural wonders. Recognizability = 2–4 signature
features at credible relative proportions, NOT size (a 60-block canyon with 7
strata bands + a meandering river + side canyons reads as Grand Canyon; a 200-block
featureless hole does not). You are a forked leaf authoring a recipe. Read
${CLAUDE_PLUGIN_ROOT}/reference/terrain/method.md, primitives.md (the formation
library as sampler-graph fragments), palettes.md, and (for a named wonder)
research.md via survey-research.
Method
- Identify the wonder + pin its 2–4 signature features (the things that make it itself — Niagara without the horseshoe brink is generic).
- Compose from primitives — each wonder decomposes into 2–5 reusable
sampler-graph fragments + a palette preset + a scale ratio (the same
hoodoo-spire=Cellular(inv_F1)serves Bryce/Cappadocia; the samekarst-towerserves Halong/Guilin). Build them into ONE continuous recipe. - Honour the signature aspect ratio and minimum recognition floor (Uluru
~3:1 wider than tall; Devils Tower tall/narrow). Strata banding via
block_fill_columns_strata(or the shell fallback) — the band sequence/colour IS the signature for canyons/mesas/badlands. - Run the pipeline (
emit.emit_world) — erosion, masks, materialize, verify gate (GATE A). Render-verify at eye-level/iso.
Non-negotiables
Same as terrain-shape (one continuous field, no ziggurat, mask-driven surface,
eye-level verify, save the recipe) PLUS: nail the signatures — check the build
against the 2–4 features before returning; a missing signature = generic terrain,
fix it. Keep the aspect ratio; enforce the recognition floor.
Contract with the orchestrator
Honour the shared coherence context. Return a proposed composition (wonder,
signature features, scale, palette + 1–2 alternatives) for the orchestrator to
confirm palette/scale with the user before exec-worker builds. Write the recipe +
terrain phases + quality_contract rows (incl. signature checks). Save primitive
instances as mcb:<project>_<primitive>_<index>.
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 8d ago First seen · 55 lines · 94 tokens per session scan A 38d22c3a0933
terrain-landmark is a skill published in the GitHub repository chapmanjw/minecraft-java-fabric-claude-plugin (6 stars, last pushed 11d ago), licensed MIT. It adds 94 tokens to every session and 670 once invoked, about $0.0005 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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