"Using npx to run tools directly without requiring an API" matching MCP servers:

Enables two LLMs to play Tic-Tac-Toe against each other autonomously using a shared tool and an SSE relay. The server facilitates agent-to-agent communication by holding tool responses until the opponent makes a move, managing the game state in real-time.

Wraps the Manifold Markets public REST API into an MCP server, providing 40 tools for querying markets, users, groups, bets, comments, and more.

An MCP server that lets Claude control a Minecraft bot with 40+ actions including movement, combat, crafting, and inventory management. Built on Mineflayer, it supports Microsoft authentication, pathfinding, and auto-reconnect.

Enables AI assistants to read, author, and edit Skyrim Special Edition plugins, including NPCs, quests, dialogue, books, items, cells, face data, and Papyrus scripts, with validation, snapshots, and packaging tools.

A source-preserving MCP server for coding agents working on Hearts of Iron IV mods, combining focus tree, GUI, and map tools with transaction safety.

An MCP server that wraps the ThreeHats Foundry VTT REST API relay so an LLM agent can author and manage Foundry VTT content, primarily creating D&D 5e creatures, through native MCP tools.

Diablo II Resurrected modding toolkit — character builder, mod build/deploy pipeline, save inspector, CASC reader, and MCP server for Claude/Codex/AI integration. Linux/Steam Deck.

Lets AI assistants control the physical Return to Dark Tower board game tower via Bluetooth, enabling connection, calibration, sound, lights, drum rotation, seal breaking, and game sequences through natural language.

Control Unity Editor from AI agents. 200+ MCP tools for GameObjects, Scenes, Assets, Materials, Prefabs, Terrain, Physics, Lighting, and more. Works with Claude, Cursor, Windsurf, VS Code Copilot — any MCP client. Zero config: just npx and go.

Enables preparing Foundry worlds and running encounters through the FoundryVTT REST API Relay, with tools for managing worlds, scenes, encounters, and table play.

Enables AI assistants to interact with AccelByte Gaming Services APIs through semantic search, detailed API information retrieval, and authenticated API execution for game backend operations.

Enables inspection of local SudokuPad replay files by exposing read-only tools that return replay metadata, filtered and paginated event timelines with undo/redo links, and full reconstructed grid states at a given action or time.

Provides Steam concurrent player trends as JSON, offering monthly player time series, growth rates across 3M/6M/12M/5Y windows, and live most-played feeds via a single REST endpoint, without needing a Steam Web API key.

MCP server for the Cocofolia TRPG tool that enables character generation, NPC batch creation, session analysis, random events, and rule assistance via natural language.

Enables Claude to interact with the RuneScape Wiki through search, page retrieval, extracts, and ASCII image rendering.

An MCP server that gives AI coding assistants access to the World of Warcraft addon API documentation, FrameXML/AddOn UI source code, and the Warcraft Wiki across all four client flavors.

Enables AI agents and command-line workflows to build Beat Saber PC mods without Visual Studio by detecting game installs, managing references, validating manifests, running builds, packaging release zips, and deploying plugins.

Enables programmatic access to the MineSkin API for generating and managing Minecraft skins through natural language commands, auto-generated using AG2's MCP builder.

Provides access to comprehensive Riot Games API documentation for League of Legends, Teamfight Tactics, Valorant, and Legends of Runeterra, including endpoint details, parameters, and response formats.

Enables solving crossword puzzles by loading grid and clue files, registering candidate words, checking consistency, and rendering final solutions. Supports Japanese crosswords with automated solving capabilities through natural language interaction.

A local MCP server that lets Claude fetch data from your Steam game library via the Steam Web API. All tools are read-only.

Enables coding agents to synthesize and play video-game sound effects by translating natural-language descriptions into layered synthesis specs, then rendering normalized WAV files.

MCP server wrapping the GNU Backgammon neural network evaluation engine. Provides 18 tools for position analysis, move evaluation, rollouts, and board conversion.

Enables AI assistants to manage TapTap minigames and H5 games, including leaderboards, sharing, multiplayer, cloud saves, and game DC data query, with zero-config OAuth 2.0 authentication.

Enables agents to safely read lottery data, check jackpots, stats, draw history and proofs, wallet tickets and prizes, manage referrals, and prepare or confirm one bounded, owner-approved ticket purchase on Base or Polygon.

Enables AI clients to control background Blender jobs over stdio so they can inspect a 3D character or companion model, calibrate its anatomy and named bones, bake and export animation, and numerically verify the persisted GLB for playback review. Includes a CLI, models and workspaces that stay local unless explicitly shared.

An MCP server that provides LLMs with access to Path of Exile game data, including gems, unique items, passive tree nodes, item modifiers, maps, scarabs, live pricing, and Path of Building build parsing, fetched at runtime from community sources without requiring an API key.

Exposes read-only tools for searching players, fetching profiles, live matches, match history, stats, leaderboards, heroes, team-ups, insights, matches, and factions from Marvel Rivals public data. It also returns an MCP-UI player dashboard rendering rank, competitive record, live match rosters, hero win rates, and recent match form, over local stdio or Streamable HTTP.

Enables Claude to read Arma Reforger wiki pages by title and, as development continues, search the Enfusion script API and locate/read the game’s own files to support modding work.

Live PC game key prices: the lowest listed price for a game across official stores and key stores (by name, Steam app ID or Steam URL, or up to 50 games at once), with a link to the full comparison.

Enables AI assistants to read and edit RPG Maker VX Ace and VX project data files directly, including databases, maps, events, scripts, and validation, without requiring Ruby.

Identify trading cards (Pokémon, One Piece, Lorcana, Yu-Gi-Oh!, Magic, Star Wars: Unlimited) and football cards from a photo, several cards per photo, with Cardmarket prices. Search and correct cards and export them as CSV or JSON; works with a free demo key, your own API key is optional.

Enables AI to write DreamBot OSRS scripts by providing real-time access to the DreamBot API 4.0 JavaDocs and best practices.

A Multi-Agent Conversation Protocol server for interacting with Google Play Game Services Configuration API, allowing management of game configurations through natural language commands.

An auto-generated MCP server that interfaces with Google's Playable Locations API, allowing agents to programmatically access and query location data for gaming applications.

An MCP server that enables interaction with Google Cloud Game Services API, allowing users to manage game server deployments, realms, and configurations through natural language.

An MCP server that runs The Fortuneteller's Hand, a solo journaling tabletop RPG where Claude runs the table, casting Omens and reading the cards.

Enables dice rolling for RPG games using standard dice notation, supporting complex expressions like keep/drop, reroll, exploding dice, and batch rolls.

An MCP server that generates RuneLite Goal Planner import strings from natural language goal descriptions, enabling assistants to create paste-ready share codes for Old School RuneScape goal planning.

Serves the canonical Tank Fight specification, enabling clients to query game parameters, maze layouts, and rules via MCP tools.