wasmcp

Overview

wasmcp provides a development kit for creating MCP servers using WebAssembly components. It enables developers to build composable, sandboxed MCP tools and resources that can be combined like building blocks. The framework supports multiple programming languages and includes features like stateful sessions, OAuth authentication, and auto-composition of components. The architecture follows a chain-of-responsibility pattern where components handle requests they understand and delegate others downstream, enabling flexible server configurations without complex configuration.

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Installation

# Install using the installer script
curl -fsSL https://raw.githubusercontent.com/wasmcp/wasmcp/main/install.sh | bash

# Or install from source
cargo install --git https://github.com/wasmcp/wasmcp

{
  "mcpServers": {
    "wasmcp": {
      "command": "wasmtime",
      "args": ["serve", "-Scli", "-Skeyvalue", "-Shttp", "path/to/your/server.wasm"]
    }
  }
}

FAQ

What programming languages are supported?

wasmcp supports multiple programming languages with component toolchain support, including Rust, Python, and TypeScript. The CLI provides templates for each language.

How does authentication work?

wasmcp supports both public (unauthenticated) and OAuth 2.1 protected modes via the WASMCP_AUTH_MODE environment variable. OAuth mode requires JWT bearer tokens with configurable issuer and JWKS endpoint validation.

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