Ephemora Cell MCP — WASM Sandbox

io.github.MichaelS1011Published by GitHub account MichaelS1011v1.0.3Updated Nov 3, 2026

WASM sandbox for MCP tools. WASI-isolated, fuel/memory/I/O capped, attested.

VerifiedSTDIODesktop onlyDeveloper Tools Security & Monitoring

Server details

Identifier: io.github.MichaelS1011/ephemora-cell-mcp
Transport: STDIO
Runtime: Desktop only
Trust: Verified
Published: Sep 17, 2026

Security note

MCP servers receive tool arguments from a conversation and may perform external actions. Review what a server can do before you enable it, and give it only the access it needs.

The registry verified the GitHub account MichaelS1011 for this listing. That does not show the account is the product's maker.

SourceWeft's checks cover whether the listing is complete and the endpoint answered; they do not review the server's code or what its tools do.

Add a badge to your README

Show readers this MCP server is listed on SourceWeft. The badge links to this page.

[![Listed on SourceWeft](https://sourceweft.com/badge/mcp/io.github.MichaelS1011%2Fephemora-cell-mcp.svg)](https://sourceweft.com/mcp/io.github.MichaelS1011%2Fephemora-cell-mcp?utm_source=readme&utm_medium=badge)

Overview

AI-generated overview

A local MCP server that runs MCP tools inside a WASI-isolated WebAssembly sandbox with capped fuel, memory and I/O, plus attestation.

What you can do: Provides a WebAssembly sandbox in which MCP tools execute under WASI isolation.
Applies limits on execution fuel, memory and I/O for sandboxed tool runs.
Reports attestation for the sandboxed execution environment.
No individual tools are listed in the available material, so concrete operations are not documented.
When to use it: Worth considering when you want to run or host MCP tools with resource limits and isolation rather than trusting them directly on the host, for example when experimenting with third-party tool code.
Requirements: Runs as a local process over stdio, installed from the PyPI package ephemora-cell; desktop only. No authentication, environment variables or headers are declared.

Before you install

The sandbox is intended to contain tool code, but the description is brief and no tool list or documentation is available, so verify what it actually executes and what attestation covers before relying on it. It runs locally on your machine.

Installation

In SourceWeft

Open Ephemora Cell MCP — WASM Sandbox in the dashboard and add it to a workspace.
Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

This repository has no README.

Tools

SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

v1.0.3LatestSep 17, 2026

Score

25% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

Reached in the last 30 days25 pts
Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.
Auth declared10 pts
Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.
Tools listed15 pts
Answer tools/list without a credential, or ship a package that starts in a sandbox without one.
DescriptionRequired15 pts
Logo10 pts
Documentation15 pts
Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.
License10 pts
Declare a license in the repository or the registry entry.