About Wassette
Wassette is an MCP server published by microsoft in the Developer Tools category: wassette: A security-oriented runtime that runs WebAssembly Components via MCP.
The repository has 966 stars and 75 forks, with the last commit 3 days ago. Recent commit activity is the strongest signal that reported issues will get attention.
Install
git clone https://github.com/microsoft/wassetteThis server has no ConduID identity, so agent calls to it are not receipted. Pin the version you install and review the source before granting it credentials.
Ask AI
Ask AI about Wassette
Powered by Claude · Grounded in docs
Security checks
Static checks derived from the repository 10 hours ago. Heuristics on the source, not an audit.
- ✓README presentThe repository ships documentation.
- ✓License declaredUsable under a stated license.
- ✓Tests presentA test suite exists in the repository.
- ✓Dependencies pinnedA lockfile pins dependency versions.
- !No dynamic code executionSource scan found eval or shell execution. Review how tool inputs reach it before granting credentials.
- !Scoped permissionsDoesn't declare a permission scope. Assume it can do anything its process can.
Releases
README
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.
README fetched from the repository 10 hours ago. The original is authoritative.