fcvm MCP Server

by carlosbravoaio.github.carlosbravoa/fcvmv0.7.0

Disposable Firecracker microVM sandboxes for agents: run code, snapshot, fork. Needs Linux with KVM.

0Pythonstdioofficial registry

context tax

pending

security

100/100

cold start

pending

freshness

Active7d ago

Our reading of fcvm, from the data

fcvm is a code execution & sandboxes MCP server from carlosbravoa, listed in the official MCP Registry.

We haven't measured its tool list yet, so its token cost is unknown.

Maintenance is active: the last public signal was 7 days ago (2026-10-12). For comparison, 68% of code execution & sandboxes servers are active or maintained.

With 0 GitHub stars it ranks #192 of 357 code execution & sandboxes servers we index.

It runs locally on your machine over stdio.

Install fcvm MCP server

claude mcp add carlosbravoa -- uvx fcvm-mcp

{
  "mcpServers": {
    "carlosbravoa": {
      "command": "uvx",
      "args": [
        "fcvm-mcp"
      ]
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "carlosbravoa": {
      "command": "uvx",
      "args": [
        "fcvm-mcp"
      ]
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "carlosbravoa": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "fcvm-mcp"
      ]
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "carlosbravoa": {
      "command": "uvx",
      "args": [
        "fcvm-mcp"
      ]
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
FCVM_MCP_NETWORK	—	—	Pin the network policy for every sandbox: none, or an allowlist such as @pypi,@github
FCVM_MCP_TEMPLATE	—	—	Template used when the agent names neither an image nor a template, e.g. python-sandbox
FCVM_MCP_TTL	—	—	Stop sandboxes this long after boot unless the agent sets a lifetime, e.g. 4h
FCVM_MCP_IDLE_STOP	—	—	Stop sandboxes that saw no exec or file operation for this long, e.g. 30m
FCVM_MCP_SECRETS	—	—	Names of environment variables passed into every sandbox as secrets, e.g. GITHUB_TOKEN
FCVM_MCP_FORWARD	—	—	Host credentials relayed into every sandbox: ssh-agent, git
FCVM_MCP_CACHE	—	—	1: restricted sandboxes fetch pip and npm packages through the host's mirror
FCVM_MCP_JAIL	—	—	0: don't run sandboxes under the Firecracker jailer even when it is set up
FCVM_BIN	—	—	Path of the fcvm command, when it isn't on PATH, in ~/.local/bin or in /usr/local/bin

Security signals

100/100 — no known issues found as of 2026-10-19, from the checks below. This is not a guarantee of safety; review what a server can do before connecting it.

Deductions

No findings from the checks that ran.

Checks

✓Repository hygiene (archived, activity, license, security policy)
○Package metadata (install scripts, provenance) — pending
○Tool descriptions (prompt-injection and hidden-text heuristics) — pending
○Source scan (secrets, CVEs, risky code) by vectra-guard — pending

Scan it yourself before installing with vectra-guard, the open-source agent security CLI. Scoring rules

Freshness

Active — last maintenance signal 7d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-10-12 · 7d ago · GitHub
Latest release
no data · GitHub
Package published
no data · npm/PyPI
Registry entry updated
2026-10-12 · 7d ago · official registry · v0.7.0

How it compares in Code Execution & Sandboxes

Against the most-starred code execution & sandboxes servers we index. Token cost is per model turn, measured from each server's live tool list.

Server	Stars	Tools	Tokens / turn	Freshness	Runs
fcvm (this)	0	—	not measured	Active	local
REA	324,759	—	not measured	Active	local
Node Repl	28,567	—	not measured	Active	local
Ask Jev	5,224	—	not measured	Active	hosted
Container Use	4,072	—	not measured	Maintained	—
MATLAB	1,679	—	not measured	Active	local

All code execution & sandboxes MCP servers

FAQ

›How do I install the fcvm MCP server in Claude Code?

Run: claude mcp add carlosbravoa -- uvx fcvm-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does fcvm require an API key?

No required environment variables are declared in its published metadata.

›Can I use fcvm as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is fcvm in the official MCP registry?

Yes, as io.github.carlosbravoa/fcvm.

Sources and method

Official MCP Registry entry: updated 2026-10-12
GitHub repository: fetched 2026-10-19
Package registry (npm / PyPI): listed
Security signals, computed by us: 2026-10-19
Last checked against all sources: 2026-10-19

The description, packages and links come from the maintainer's own published metadata. Token cost, security signals, freshness and the reading above are MCPSkillHub's own measurements; see the methodology. Spot an error? Request a correction or claim the listing.