# Runtime Cloud (npm · withruntime)

Linux microVM sandboxes for AI agents: run commands, files, processes, pause and wake.

- Trust score: 74/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-27

## Components

- remote · `api.withruntime.com`: 39/100, [markdown](https://verifymcp.io/servers/com-withruntime-runtime/api.md), [page](https://verifymcp.io/servers/com-withruntime-runtime/api)
- npm · `withruntime`: 74/100 (this document), [markdown](https://verifymcp.io/servers/com-withruntime-runtime/withruntime.md), [page](https://verifymcp.io/servers/com-withruntime-runtime/withruntime)

## Channel facts

- Registry: `npm`
- Package: `withruntime`
- Version: `0.7.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-27.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 0 of 1 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 45/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (Apache-2.0).
  - Actively maintained (last published 0 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 83/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 131 tokens (~131/item across 1 items; 1 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 13/100
  - Stability observed for 4 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 1 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 2 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Runtime Cloud MCP server?

Runtime Cloud runs locally as an npm package, launched with npx -y withruntime. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add com-withruntime-runtime -- npx -y withruntime
```

### Cursor

```json
{
  "mcpServers": {
    "com-withruntime-runtime": {
      "command": "npx",
      "args": [
        "-y",
        "withruntime"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-withruntime-runtime": {
      "command": "npx",
      "args": [
        "-y",
        "withruntime"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add com-withruntime-runtime -- npx -y withruntime
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-withruntime-runtime": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "withruntime"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-withruntime-runtime --command npx --arg -y --arg withruntime
```

### Hermes

```yaml
mcp_servers:
  com-withruntime-runtime:
    command: "npx"
    args: ["-y", "withruntime"]
```

### Netclaw

```json
{
  "McpServers": {
    "com-withruntime-runtime": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "withruntime"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-withruntime-runtime -t stdio -c npx -a -y withruntime
```

### Other

```json
{
  "mcpServers": {
    "com-withruntime-runtime": {
      "command": "npx",
      "args": [
        "-y",
        "withruntime"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-27 (score 74, +12)

- [security improvement] Known CVEs: unverified → pass
- [functional improvement] Dependency health: unverified → 1.00

### 2026-09-26 (score 62, −6)

- [security regression] Known CVEs: pass → unverified
- [security improvement] Source repository: fail → pass
- [functional regression] Security disclosure: unverified → fail
- [functional regression] Dependency health: 1.00 → unverified
- [functional] Package version: 0.6.1 → 0.7.1
- [functional] Package version: 0.6.1 → 0.7.0

### 2026-09-25 (score 68, +18)

- [security improvement] Malware scan: unverified → pass
- [functional improvement] License: fail → pass
- [functional] Licence: Apache-2.0
- [functional] Package version: 0.5.1 → 0.6.1
- [functional] Package version: 0.5.1 → 0.6.0
- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-24 (score 50, −14)

- [security regression] Malware scan: pass → unverified
- [security regression] Known CVEs: pass → unverified
- [functional regression] Dependency health: 1.00 → unverified
- [functional improvement] Stability: unverified → 0.03
- [functional] Package version: 0.4.0 → 0.5.1
- [functional] Package version: 0.4.0 → 0.5.0

### 2026-09-23 (score 64)

First indexed and scored.

## MCP tools (1)

### `runtime_connect` (~65 tokens)

Connect this machine to Runtime

Connect Runtime on this machine with a browser approval. The first call returns a link and a code: show them to the person you work for and ask them to approve. Call again after they have; it waits up to 45 seconds for the approval, then Runtime's tools appear.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/com-withruntime-runtime/withruntime#diagnostics

## Score history

- 2026-09-27: 74
- 2026-09-26: 62
- 2026-09-25: 68
- 2026-09-24: 50
- 2026-09-23: 64

## Common questions

### What is the Runtime Cloud MCP server?

Runtime Cloud is an MCP server listed in the public MCP registry as com.withruntime/runtime. Linux microVM sandboxes for AI agents: run commands, files, processes, pause and wake. This page covers its npm package (withruntime).

### Is the Runtime Cloud MCP server safe to use?

Runtime Cloud scores 74 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 27 September 2026. It declares no install or post-install scripts. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Runtime Cloud MCP server expose?

Runtime Cloud exposes 1 tool: runtime_connect. Their descriptions and schemas cost roughly 65 tokens of context every time the server is loaded.

### Is the Runtime Cloud MCP server still maintained?

Runtime Cloud is still listed as active in the MCP registry. We last reached this channel on 27 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the Runtime Cloud MCP server under?

Runtime Cloud declares the Apache-2.0 licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/withruntime
- Socket report: https://socket.dev/npm/package/withruntime
- Repository: https://github.com/withruntime/runtime
- Website: https://withruntime.com/docs/mcp
- Changelog RSS feed: https://verifymcp.io/servers/com-withruntime-runtime/withruntime.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-withruntime-runtime/withruntime.json
- HTML version of this page: https://verifymcp.io/servers/com-withruntime-runtime/withruntime