MCP server for Minecraft mod development - provides decompiled code access, symbol search, and runtime interaction via DebugBridge
Mcdev MCP MCP server is a locally run integration for AI assistants that speak the Model Context Protocol. MCP server for Minecraft mod development - provides decompiled code access, symbol search, and runtime interaction via DebugBridge.
An MCP (Model Context Protocol) server that empowers AI coding agents to work effectively with Minecraft mod development. Provides both static analysis of decompiled source code and runtime interaction with a running Minecraft instance.
Once Mcdev MCP is connected, these are the calls the assistant has available:
mc_run_command — MCDEV_RUN_COMMAND=1 (or true)mc_script_logs — MCDEV_SCRIPT_LOGS=1 (or true)serve — Start the MCP server over stdio (launched by MCP clients — not run by humans)status — Show all initialized versions and what stage each one is atmc_version — Manage the active Minecraft version. Call with action: "set" before other static tools, or action: "list" to see what's initializedmc_search — Search decompiled source code for classes, methods, or fields by name patternmc_get_class — The mc_get_class tool exposed by this servermc_get_method — The mc_get_method tool exposed by this servermc_find_refs — Find who calls a method (callers) or what it calls (callees)mc_list_classes — List all classes under a specific package path (includes subpackages)mc_list_packages — List all available packages. Optionally filter by namespacemc_find_hierarchy — Find classes that extend or implement a given class or interface| Dependency | Version | Purpose | |------------|---------|---------| | Node.js | 18+ | Runtime | | Java | 8+ | Decompilation (Vineflower) & callgraph | | ~2GB | disk | Decompiled sources + cache | > Note: Java 17+ is recommended for the callgraph command due to Gradle compatibility.
mcdev-mcp on npm is all you need. Most clients run it directly, so configuration is a few lines and a restart.
Among the developer tooling options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. Mcdev MCP's toolset — mc_run_command, mc_script_logs, serve and 11 more — is a fair guide to whether it matches your workflow. It is maintained by weikengchen; worth a glance at recent repository activity before you build anything load-bearing on it.
SyncDev reviews every entry in this directory against the project's own documentation before publishing, and revisits them as servers change.
| Tool | What it does |
|---|---|
| mc_run_command | MCDEV_RUN_COMMAND=1 (or true) |
| mc_script_logs | MCDEV_SCRIPT_LOGS=1 (or true) |
| serve | Start the MCP server over stdio (launched by MCP clients — not run by humans) |
| status | Show all initialized versions and what stage each one is at |
| mc_version | Manage the active Minecraft version. Call with action: "set" before other static tools, or action: "list" to see what's initialized. |
| mc_search | Search decompiled source code for classes, methods, or fields by name pattern. |
| mc_get_class | The mc_get_class tool exposed by this server. |
| mc_get_method | The mc_get_method tool exposed by this server. |
| mc_find_refs | Find who calls a method (callers) or what it calls (callees). |
| mc_list_classes | List all classes under a specific package path (includes subpackages). |
| mc_list_packages | List all available packages. Optionally filter by namespace. |
| mc_find_hierarchy | Find classes that extend or implement a given class or interface. |
| mc_connect | Connect to a running Minecraft instance. Other runtime tools auto-connect if needed. Pass reset: true to disconnect and clear state before reconnecting (useful when switching instances). If port is omitted, scans ports 9 |
| mc_execute | Execute Groovy code in the running game. The binding persists across calls, and mc / player / level are pre-bound. (The runtime migrated from Lua to Apache Groovy 5 in mid-2026 — the tool description carries a Lua→Groovy |
{
"mcpServers": {
"mcdev": {
"command": "npx",
"args": ["-y", "mcdev-mcp", "serve"]
}
}
}Configuration as documented by the project. Restart the client after saving.
| Dependency | Version | Purpose | |------------|---------|---------| | Node.js | 18+ | Runtime | | Java | 8+ | Decompilation (Vineflower) & callgraph | | ~2GB | disk | Decompiled sources + cache | > Note: Java 17+ is recommended for the callgraph command due to Gradle compatibility.
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