Ephemora Cell MCP — WASM Sandbox MCP Server

by michaels1011 Your server? Claim it

local only

Ephemora Cell MCP — WASM Sandbox runs on your own machine — the client starts it, so there is no endpoint to ping. Last commit 21 Sep 2026.

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

—

Installs / week

pypi · ephemora-cell

Stars

6 open issues

21 Sep 2026

Last commit

no recent releases

Apache-2.0

License

Python

What the code does

We read the source, 8 h ago · rules 3dff92dd89df

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Runs an external command assets/demo_attack_probe.py:48, assets/make_conformance.py:90, assets/make_demo_compare.py:147 и ещё 12

        p = subprocess.run(

Dumps the whole environment ephemora_cell/builder.py:339, [пакет] ephemora_cell/builder.py:339

    return dict(os.environ)

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add ephemora-cell-mcp -- uvx ephemora-cell

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "ephemora-cell-mcp": {
      "args": [
        "ephemora-cell"
      ],
      "command": "uvx"
    }
  }
}

~/.codex/config.toml

[mcp_servers.ephemora-cell-mcp]
command = "uvx"
args = ["ephemora-cell"]

.cursor/mcp.json

{
  "mcpServers": {
    "ephemora-cell-mcp": {
      "args": [
        "ephemora-cell"
      ],
      "command": "uvx"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "ephemora-cell-mcp": {
      "args": [
        "ephemora-cell"
      ],
      "command": "uvx"
    }
  }
}

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Ephemora Cell MCP — WASM Sandbox — questions

Answers built from our own checks of this server.

Why is there no uptime for Ephemora Cell MCP — WASM Sandbox?

Ephemora Cell MCP — WASM Sandbox runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the pypi package ephemora-cell.

How do I connect Ephemora Cell MCP — WASM Sandbox?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It runs locally, so the command pulls ephemora-cell straight from pypi; nothing to host, nothing to sign up for.

Is Ephemora Cell MCP — WASM Sandbox open source?

Yes — it is published under the Apache-2.0 licence, written in Python, 41 stars on GitHub and 6 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.