MCP Waifu Chat Server MCP Server

FastMCP server for conversational AI waifu with user management, dialog CRUD (get/set/reset), OpenRouter API integration, SQLite persistence, and modular extension architecture. The mcp waifu chat server mcp server wraps that behind the Model Context Protocol, so an assistant can use it through 2 defined tools rather than through you.

What it actually does

This project implements a basic MCP (Model Context Protocol) server for a conversational AI "waifu" character. It uses the mcp library for Python to handle the protocol details and FastMCP for easy server setup.

• User management (create, check existence, delete, count)
• Dialog history storage (get, set, reset)
• Basic chat functionality (using OpenRouter API)
• Modular design for easy extension
• Configuration via environment variables and API key file
• SQLite database for persistence

Its toolset

Everything the assistant can do here goes through one of these:

• user_count — returns the number of users in the database for the current user
• Resources — The Resources tool exposed by this server

Adding it to your client

Setup follows the usual MCP pattern — install or clone the server, register it in your client's configuration file, restart the client.

Configuration

You will need one environment variable: OPENROUTER_API_KEY. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.

• Python 3.10+ * uv * An OpenRouter API Key

When to reach for it

This sits in the database access group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. MCP Waifu Chat Server's toolset — user_count, Resources — is a fair guide to whether it matches your workflow. It is maintained by waifuai; worth a glance at recent repository activity before you build anything load-bearing on it.

We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.

Caveats

• It runs with your machine's permissions. That is convenient and also the reason to think about what you point it at before you approve a tool call.
• Missing credentials fail quietly in some clients — if no tools show up, check the environment block first.
• MCP clients confirm each tool call by default. Leave that on until you have watched what the mcp waifu chat server mcp server does with a few real requests.