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 skills add MCDxAI/minecraft-dev-mcp --skill minecraft-devgit clone --depth 1 https://github.com/MCDxAI/minecraft-dev-mcpWrote 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/mcdxai/minecraft-dev-mcp/minecraft-dev)<a href="https://agentmods.dev/skills/mcdxai/minecraft-dev-mcp/minecraft-dev"><img src="https://agentmods.dev/badge/skills/mcdxai/minecraft-dev-mcp/minecraft-dev/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/mcdxai/minecraft-dev-mcp/minecraft-dev"><img src="https://agentmods.dev/badge/skills/mcdxai/minecraft-dev-mcp/minecraft-dev.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00068 | $0.01409 |
| Opus 5.5 | $0.00027 | $0.00564 |
| Sonnet 5.5 | $0.00014 | $0.00282 |
| Haiku 4.5 | $0.00007 | $0.00141 |
Grade A, and why
minecraft-dev 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 yesterday.
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 — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Minecraft Dev CLI Lookup
Use minecraft-dev-cli to inspect Minecraft code, mod and loader JARs, mappings, registries, versions, and docs.
Version format note
Use the actual Minecraft version the user is working with. Modern releases use the newer 26.1.x naming style, for example 26.1.2.
1.14through1.21.11support bothyarnandmojmap.26.1+usesmojmaponly.- Yarn mappings stop at
1.21.11.
Workflow
- Identify whether the user needs Minecraft source, mod source, mod loader metadata, mappings, registries, docs, validation, or version diffing.
- Pick the narrowest tool that answers the request.
- Run
minecraft-dev-cli <tool> --key valueorminecraft-dev-cli <tool> --key=value. - Parse the JSON response and return only the useful result.
- If the request is vague, ask for the class name, file path, symbol, JAR path, or Minecraft version.
Tool List
Core Minecraft source
get_minecraft_source— get decompiled source for one Minecraft class.decompile_minecraft_version— decompile an entire Minecraft version into cache.list_minecraft_versions— list available and cached Minecraft versions.get_registry_data— extract block, item, entity, and other registry data.search_minecraft_code— regex search through decompiled Minecraft source.index_minecraft_version— build a fast full-text index for Minecraft source.search_indexed— run fast indexed searches against Minecraft source.
Mappings and comparison
find_mapping— translate class, method, and field names between mapping systems.remap_mod_jar— remap a Fabric mod JAR to readable names.compare_versions— compare two Minecraft versions at a high level.compare_versions_detailed— compare versions with AST-level API detail.
Validation and documentation
analyze_mixin— validate Mixin targets and injections against Minecraft source.validate_access_widener— validate access widener targets against Minecraft source.validate_access_transformer— validate a Forge/NeoForge access transformer (.cfg) against Minecraft source (mojmap-only); flags bad targets/signatures, record canonical-constructor crashes, inner-class accessibility, and conflicting modifiers.get_documentation— fetch documentation hints for a Minecraft class or concept.search_documentation— search known Minecraft and Fabric docs.
What ships with it
1 file 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.
- yesterday Changed · +7 lines 9160cde4f313
- 1mo ago First seen · 117 lines · 68 tokens per session scan A 7147fa527a9a
minecraft-dev is a skill published in the GitHub repository MCDxAI/minecraft-dev-mcp (47 stars, last pushed yesterday), licensed MIT. It adds 68 tokens to every session and 1,409 once invoked, about $0.0003 per session on Opus 5.5. 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.
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