Sandbox as a Service vs MCP Js
A side-by-side look at the Sandbox as a Service and MCP Js MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Sandbox as a Service for code execution work over a hosted endpoint; choose MCP Js for code execution over a hosted endpoint. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Sandbox as a Service when
- You need dedicated capabilities in the Code Execution domain.
- You prefer a remote HTTP/SSE transport.
- You have the keys it needs:
AAS_API_KEY, AAS_BASE_URL.
Choose MCP Js when
- You need dedicated capabilities in the Code Execution domain.
- You prefer a remote HTTP/SSE transport.
- Its auth model fits you: API key required.
- You want tools like
run_js, get_execution, get_execution_output.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Code Execution | Code Execution |
| Quality signal | 37/100 · Fair | 57/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Remote HTTP/SSE | Remote HTTP/SSE |
| Auth | Not declared | API key required |
| Pricing | Not declared | Free |
| Required env vars | AAS_API_KEY |
Tools & capabilities
Sandbox as a Service tools
No tool names declared yet. Check the project README from the listing page.
MCP Js tools 5
run_jsStateful: queue execution → `{execution_id}`. Stateless: run and return `{output, error?}`.get_executionPoll status/result of an execution.get_execution_outputRead paginated console output (line or byte).cancel_executionTerminate a running execution.list_executionsList executions and their status.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Sandbox as a Service
{
"mcpServers": {
"sandbox-as-a-service": {
"url": "https://sandbox-as-a-service.com/v1/mcp"
}
}
}
MCP Js
{
"mcpServers": {
"r33drichards-mcp-js": {
"url": "http://localhost:8080/mcp"
}
}
}
Frequently asked questions
Sandbox as a Service is categorized under Code Execution and uses a remote HTTP/SSE transport. MCP Js belongs to Code Execution and uses a remote HTTP/SSE transport. Pick Sandbox as a Service for code execution work and MCP Js for code execution.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Sandbox as a Service has no declared pricing — check the project's own site. MCP Js is listed as free. Auth: api key required. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add sandbox-as-a-service and r33drichards-mcp-js as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Sandbox as a Service has a quality signal of 37/100 (Fair) with 1 views, 0 installs and 0 GitHub stars. MCP Js has 57/100 (Good) with 2 views, 0 installs and 59 GitHub stars.
