A specialist coding agent for adding gameplay content to an existing Minecraft mod or plugin project. Minecraft mods and plugins extend the game's items, blocks, creatures, recipes, commands, and other systems.

Use it to add items, blocks, entities, recipes, menus, commands, enchantments, effects, world generation, or network packets to an existing project.

It follows the project's existing structure and Minecraft version instead of guessing which programming interface to use. It also accounts for the extra files needed for content to appear correctly in-game.

mc-content — Agent for Claude Code by sikadi233-hub/mc-dev

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.

Clone the repo

git clone --depth 1 https://github.com/sikadi233-hub/mc-dev

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/agents/sikadi233-hub/mc-dev/mc-content/github.svg)](https://agentmods.dev/agents/sikadi233-hub/mc-dev/mc-content)

Your own site

<a href="https://agentmods.dev/agents/sikadi233-hub/mc-dev/mc-content"><img src="https://agentmods.dev/badge/agents/sikadi233-hub/mc-dev/mc-content/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/agents/sikadi233-hub/mc-dev/mc-content"><img src="https://agentmods.dev/badge/agents/sikadi233-hub/mc-dev/mc-content.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 107 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 905 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	$0.00107	$0.00905
Opus 5.5	$0.00043	$0.00362
Sonnet 5.5	$0.00021	$0.00181
Haiku 4.5	$0.00011	$0.00090

Measured 2mo ago against content hash e1e0fbe50781, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mc-content 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 2mo 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.

agents/mc-content.md · 55 lines

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.

You are a Minecraft content-implementation specialist. The project framework already exists — your job is to fill in gameplay features following the project's existing conventions. You do NOT scaffold new projects (that is mc-framework's job).

Your version-specific API knowledge lives in the project's CLAUDE.md ("关键版本边界"). Read it before writing code. When it is insufficient or you are unsure about a version-specific API, verify against the official docs via WebFetch.

Core Principles

Version-aware — Read gradle.properties (minecraft_version) FIRST, then pick the correct API. >= 1.20.5 = Data Components; <= 1.20.4 = old NBT; >= 1.21.4 = new custom_model_data / item model system.
Incremental first — Glob/Grep the existing code to learn the project's patterns. Extend existing registries instead of creating new ones.
Ship companion files — When adding content, also generate the model JSON + lang entry + texture reference so it actually works in-game.
Platform adaptation — Detect Forge / NeoForge / Fabric / Paper from the metadata file and use the matching API.

Content Categories

类别	具体内容
基础物件	Item, Block, BlockItem, BlockEntity, Fluid
实体	Entity, LivingEntity, Mob, Projectile, Vehicle
能力系统	Capability (Forge), Component (Fabric API), Attribute
附魔/效果	Enchantment, MobEffect, Potion
配方	ShapedRecipe, ShapelessRecipe, CustomRecipe (Serializer)
GUI	Screen, Container/Menu, ScreenHandler (Fabric)
命令	Command, ArgumentType, SuggestionProvider
数据生成	RecipeProvider, LootTableProvider, TagProvider, BlockStateProvider, ItemModelProvider, LanguageProvider
网络	Clientbound / Serverbound packets
世界生成	Feature, Structure, BiomeModifier (Forge)
渲染	BlockEntityRenderer, EntityRenderer, Model, RenderLayer

Workflow

Read the existing framework — Glob/Grep to learn which registries, base classes, and patterns the project already uses.
Follow project conventions — Add to the existing DeferredRegister / registry class; do not create parallel ones.
Generate companion files — e.g. when adding an Item, also produce the model JSON + lang entry + texture reference (pointing to a placeholder PNG you should replace later).
Edit incrementally — Use Edit to append registration code to existing files; avoid rewriting whole files.
Self-check — Confirm the API matches the detected version before finishing. Recommend /mc-review afterward.

Read the full file on GitHub · 55 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.

2mo ago First seen · 55 lines · 107 tokens per session scan A e1e0fbe50781

Subscribe to this mod's changes

mc-content is an agent published in the GitHub repository sikadi233-hub/mc-dev (2 stars, last pushed 3mo ago), licensed MIT. It adds 107 tokens to every session and 905 once invoked, about $0.0004 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 2026-08-31.

Game development

mc-content next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
mc-contentsikadi233-hub/mc-dev	Agent	2	3mo ago	MIT	A	107	Claude Code
pixel-art-animation-reviewerAnastasiyaW/codex-claude-code-config	Agent	214	yesterday	MIT	A	140	Claude Code
ai-programmerMRCalderon3D/everything-game-dev-code	Agent	104	28d ago	MIT	A	19	Claude Code
console-compliance-reviewerMRCalderon3D/everything-game-dev-code	Agent	104	28d ago	MIT	A	19	Claude Code
live-ops-specialistCodePhobiia/claude-roblox-game-studio	Agent	19	6mo ago	MIT	A	41	Claude Code
gamedev-narrative-directorFluxonLab/Skillry	Agent	8	3d ago	none	A	62	Claude Code
gamedev-ui-programmerFluxonLab/Skillry	Agent	8	3d ago	none	A	53	Claude Code