FetchSandbox MCP Server
by fetchsandboxio.github.fetchsandbox/mcpv0.7.2
A deterministic verification engine for agents. Proves a fix: fails on the old code, passes on new.
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Active5d ago
Install FetchSandbox MCP server
Install in Claude Code
claude mcp add fetchsandbox -e FETCHSANDBOX_API_KEY='<fetchsandbox-api-key>' -- npx -y fetchsandbox-mcpInstall in Cursor
{
"mcpServers": {
"fetchsandbox": {
"command": "npx",
"args": [
"-y",
"fetchsandbox-mcp"
],
"env": {
"FETCHSANDBOX_API_KEY": "<fetchsandbox-api-key>"
}
}
}
}Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).
Install in Claude Desktop
{
"mcpServers": {
"fetchsandbox": {
"command": "npx",
"args": [
"-y",
"fetchsandbox-mcp"
],
"env": {
"FETCHSANDBOX_API_KEY": "<fetchsandbox-api-key>"
}
}
}
}Settings → Developer → Edit Config (claude_desktop_config.json), then restart.
Install in VS Code
{
"servers": {
"fetchsandbox": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"fetchsandbox-mcp"
],
"env": {
"FETCHSANDBOX_API_KEY": "<fetchsandbox-api-key>"
}
}
}
}Add to .vscode/mcp.json in your workspace.
Install in Windsurf
{
"mcpServers": {
"fetchsandbox": {
"command": "npx",
"args": [
"-y",
"fetchsandbox-mcp"
],
"env": {
"FETCHSANDBOX_API_KEY": "<fetchsandbox-api-key>"
}
}
}
}Add to ~/.codeium/windsurf/mcp_config.json.
Configuration
| Variable | Required | Secret | Description |
|---|---|---|---|
| FETCHSANDBOX_API_KEY | — | yes | Optional. Sign in without a browser — useful in CI. Left unset, the server runs anonymously and asks you to sign in the first time a run produces a receipt. |
| FETCHSANDBOX_TELEMETRY | — | — | Set to '0' to disable anonymous usage telemetry. |
| FETCHSANDBOX_BASE_URL | — | — | Override the FetchSandbox backend base URL (defaults to https://fetchsandbox.com). Useful for stage/self-hosted testing. |
Remote endpoints
- streamable-http
https://fetchsandbox.com/mcp/v1
Freshness
Active — last maintenance signal 5d ago. The newest of the signals below sets the band.
Last commit (default branch)
2026-10-04 · 5d ago · GitHub
Latest release
2026-10-04 · 5d ago · GitHub · v0.7.2
Package published
no data · npm/PyPI
Registry entry updated
2026-10-04 · 5d ago · official registry · v0.7.2
FAQ
›How do I install the FetchSandbox MCP server in Claude Code?
Run: claude mcp add fetchsandbox -e FETCHSANDBOX_API_KEY='<fetchsandbox-api-key>' -- npx -y fetchsandbox-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.
›Does FetchSandbox require an API key?
Yes. It expects FETCHSANDBOX_API_KEY, of which 1 is a secret.
›Can I use FetchSandbox as a remote (hosted) MCP server?
Yes — it offers both a hosted endpoint and a local stdio package.
›Is FetchSandbox in the official MCP registry?
Yes, as io.github.fetchsandbox/mcp.