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@niklaserik/effect MCP Server

@niklaserik

Repository

Basic information

Category

Other

License

MIT

Transports

stdio

Author

niklaserik

About @niklaserik/effect MCP Server

A mcp server for fetching the Effect-ts documentation

@niklaserik/effect MCP Server config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "effect-mcp": {
      "command": "node",
      "args": [
        "dist/index.js",
        "#",
        "stdio",
        "transport"
      ]
    }
  }
}

@niklaserik/effect MCP Server tools

Tool list not available yet

This listing does not currently have a tool list to display. This does not mean the server has no tools; check its documentation for supported capabilities.

We auto-extract tools from the README. The maintainer can list them under a ## Tools heading to populate this section.

Overview

What is @niklaserik/effect-mcp?

It is a Model Context Protocol (MCP) server that fetches the most current documentation from the Effect ecosystem. It integrates with AI assistants and tools like VS Code to provide real-time access to Effect package documentation for developers.

How to use @niklaserik/effect-mcp?

Install via pnpm add @niklaserik/effect-mcp, then build and run the server (node dist/index.js) over stdio transport. Connect with an MCP client (e.g., VS Code or MCP Inspector) and list resources or call tools like effect-documentation or effect-doc-links.

Key features of @niklaserik/effect-mcp

  • Real-time documentation access for Effect ecosystem
  • Supports both stable and experimental packages
  • Context-aware package detection based on imports
  • Seamless integration with VS Code and MCP clients
  • In-memory TTL cache (~10 minutes)
  • Lightweight retry on transient fetch errors

Use cases of @niklaserik/effect-mcp

  • Query an AI assistant for up-to-date API documentation on an Effect package
  • Automatically retrieve relevant docs for imported Effect packages in a code editor
  • Fetch documentation for multiple Effect libraries at once for a quick reference
  • Get plain documentation URIs to follow in a browser or other client

Frequently asked questions

1

How does the server fetch documentation?

It fetches documentation in real time directly from the Effect ecosystem, using an in-memory TTL cache (~10 minutes) to avoid refetching unchanged docs.

2

What transport does the server use?

It uses stdio transport by default and can be adapted to Streamable HTTP if needed.

3

Which Effect packages does it support?

It supports a curated list including `effect`, `@effect/platform`, `@effect/sql`, `@effect/vitest`, `@effect/ai`, `@effect/cli`, `@effect/cluster`, `@effect/rpc`, and `@effect/typeclass`.

4

Are there any runtime requirements?

The server requires Node.js, pnpm, and the `@modelcontextprotocol/sdk` v1.17.4+.

5

How does the server handle transient errors?

It applies lightweight retry with small backoff on transient fetch errors.

Comments

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