wassette
Wassette: A security-oriented runtime that runs WebAssembly Components via MCP
Install with your AI
Paste into Claude Code, Cursor, or any agent — it reads the repo and wires the tool into your project.
Install and set up wassette (release-binary project) into my current project. Found on https://claudeers.com/wassette Repo: https://github.com/microsoft/wassette Homepage/docs: https://microsoft.github.io/wassette/ Detected install method: release-binary → inspect the README Category: mcp-servers. Platforms: cli, api, web. Read the repo's README for exact setup and env vars, then install it and wire it into my project. Claudeers Health Verdict: active; community-verified: false. Confirm the source before running anything.
Grab the latest release asset from GitHub.
# download a build from https://github.com/microsoft/wassette/releases
git clone https://github.com/microsoft/wassette
// compatibility
| Platforms | cli, api, web |
|---|---|
| Operating systems | — |
| AI compatibility | claude |
| License | MIT |
| Pricing | open-source |
| Language | Rust |
Wassette
A security-oriented runtime that runs WebAssembly Components via MCP
Quick Start | FAQ | Documentation | Releases | Contributing | Discord
[!WARNING] Early Development: This repository is not production ready yet. It is in early development and may change significantly.
Why Wassette?
- Convenience: Wassette makes it easy to extend AI agents with new tools, all without ever having to leave the chat window.
- Reusability: Wasm Components are generic and reusable; there is nothing MCP-specific about them.
- Security: Wassette is built on the Wasmtime security sandbox, providing browser-grade isolation of tools.
Architecture
Installation
Quick start: For Linux/macOS, use our one-liner install script:
curl -fsSL https://raw.githubusercontent.com/microsoft/wassette/main/scripts/install.sh | bash
For complete installation instructions for all platforms (including Windows, Homebrew, Nix, Docker, and more), see our Installation Guide.
Using Wassette
With Wassette installed, the next step is to register it with your agent of choice. See our Quick Start guide (3 simple steps), or check the MCP Clients guide for detailed setup instructions for GitHub Copilot, Copilot CLI, Claude Code, and Codex CLI.
Once configured, you can start loading WebAssembly components. To teach your agent to tell the time, ask it to load a time component:
Please load the time component from oci://ghcr.io/microsoft/time-server-js:latest
Now that the time component is loaded, we can ask your agent to tell you the current time:
What is the current time?
The agent will respond with the current time, which is fetched from the time component running in a secure WebAssembly sandbox:
The current time July 31, 2025 at 10:30 AM UTC
Congratulations! You've just run your first Wasm Component and taught your agent how to tell time!
Demo
https://github.com/user-attachments/assets/8e5a371c-ac72-406d-859c-03833ee83963
Discord
You can join us via the #wassette channel on the Microsoft Open Source Discord:
Contributing
Please see CONTRIBUTING.md for more information on how to contribute to this project.
License
This project is licensed under the MIT License.
Trademarks
This project may contain trademarks or logos for projects, products, or services. Authorized use of Microsoft trademarks or logos is subject to and must follow Microsoft’s Trademark & Brand Guidelines. Use of Microsoft trademarks or logos in modified versions of this project must not cause confusion or imply Microsoft sponsorship. Any use of third-party trademarks or logos are subject to those third-party’s policies.
Contributors
Thanks to all contributors who are helping shape Wassette into something great.
// faq
What is wassette?
Wassette: A security-oriented runtime that runs WebAssembly Components via MCP. It is open-source on GitHub.
Is wassette free to use?
wassette is open-source under the MIT license, so it is free to use.
What category does wassette belong to?
wassette is listed under mcp-servers in the Claudeers registry of Claude-compatible tools.
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[](https://claudeers.com/wassette)
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[](https://claudeers.com/wassette)
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