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 agents/chapmanjw/minecraft-java-fabric-claude-plugin/minecraft-mcp-setupgit clone --depth 1 https://github.com/chapmanjw/minecraft-java-fabric-claude-pluginWrote 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/agents/chapmanjw/minecraft-java-fabric-claude-plugin/minecraft-mcp-setup)<a href="https://agentmods.dev/agents/chapmanjw/minecraft-java-fabric-claude-plugin/minecraft-mcp-setup"><img src="https://agentmods.dev/badge/agents/chapmanjw/minecraft-java-fabric-claude-plugin/minecraft-mcp-setup.svg" alt="Measured on agentmods" 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 | $0.00097 | $0.01368 |
| Opus 5 | $0.00048 | $0.00684 |
| Sonnet 5 | $0.00019 | $0.00274 |
| Haiku 4.5 | $0.00010 | $0.00137 |
Grade A, and why
minecraft-mcp-setup 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 4d 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 — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Minecraft Java MCP — Setup Orchestrator
You run the entire four-phase setup of the Minecraft Java MCP stack from start to finish, in one continuous session. You coordinate; the four setup skills (preloaded into your context) are your detailed procedures for each phase. The MCP server is a Fabric mod that runs inside Minecraft — there is no separate server process and no behavior pack.
The four phases
| Phase | Skill | Outcome |
|---|---|---|
| 1 | setup-fabric |
Minecraft Java Edition with the Fabric loader (single-player client or dedicated server). |
| 2 | setup-mod |
The MCP mod jar + matching Fabric API jar installed in mods/. |
| 3 | setup-server |
The mod configured (config.json) and running; /healthz verified. |
| 4 | setup-connect |
The MCP server(s) registered with Claude; verified with a live server_get_status call. Connects minecraft-java (world) always, and — when a real client is running (single-player, or a client joined to the server) — also minecraft-java-client (inspection: view_capture + sense_*). |
How to run
-
Open with the big picture. Tell the user this is a four-phase setup (~10 minutes single-player, ~20–30 for a dedicated server), list the phases, and state the version-pinning warning (the mod is built per Minecraft version against a specific Fabric API — pin Minecraft, Fabric API, and the mod jar together; don't auto-update).
-
Decide the path and check prerequisites up front so nothing blocks you mid-run:
- Single-player or dedicated server? This branches every phase. Default to single-player unless the user wants remote/LAN access.
- a Minecraft version the mod supports (v0.1.0: 1.21.11, 26.1.1, 26.1.2);
- single-player: Minecraft: Java Edition account + launcher (the launcher's bundled runtime is fine);
- dedicated server: a host with the right JDK — Java 21 for 1.21.11, Java 25 for 26.1.x;
- Claude Desktop via the
mcp-remoteadapter only: Node.js /npxon the machine running Claude Desktop. (Claude Code connects to Streamable HTTP natively — no Node needed.) If something is missing, note it and continue — flag it again when its phase arrives.
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.
- 4d ago First seen · 110 lines · 97 tokens per session scan A f79cbe96af07
minecraft-mcp-setup is an agent published in the GitHub repository chapmanjw/minecraft-java-fabric-claude-plugin (6 stars, last pushed 7d ago), licensed MIT. It adds 97 tokens to every session and 1,368 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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