sandbox-sdk
https://raw.githubusercontent.com/cloudflare/skills/main/skills/sandbox-sdk/SKILL.md
github.com/cloudflare/skills
Scanned Thu, 28 May 2026 16:57:31 GMT
Scan ID crawl-frz5tlm7xlw1zutgifvaywuy · 1ms
B
SCORE 75 / 100
Verdict: Safe to install

5 medium findings.

This skill spawns subprocesses outside its declared capabilities plus 4 other issues listed below.

0 critical0 high5 medium7 rules passed

Why grade B?

score · 75 / 100

The current grade reflects 5 medium findings (3+ MEDs → B).

0 CRIT0 HIGH5 MED0 LOW
To reach a higher grade
  • A
    Reach Atarget score 95

    Resolve 3 of 5 MED (cap is 2).

Thresholds are documented at /docs/grading. Source-of-truth is the grade() function in @skillox/scanner.

Findings · ordered by severity

med
Arbitrary subprocess execution detected
The skill spawns subprocesses. Without a capability manifest declaring this, the skill could execute arbitrary commands.
rule: subprocess-executionline: 61CWE-78
▾
59|------|--------|
60| Get sandbox | `getSandbox(env.Sandbox, 'user-123')` |
61| Run command | `await sandbox.exec('python script.py')` |← spawns a subprocess outside declared capabilities
62| Run code (interpreter) | `await sandbox.runCode(code, { language: 'python' })` |
63| Write file | `await sandbox.writeFile('/workspace/app.py', content)` |
med
Arbitrary subprocess execution detected
The skill spawns subprocesses. Without a capability manifest declaring this, the skill could execute arbitrary commands.
rule: subprocess-executionline: 76CWE-78
▾
74```typescript
75const sandbox = getSandbox(env.Sandbox, 'user-123');
76const result = await sandbox.exec('python --version');← spawns a subprocess outside declared capabilities
77// result: { stdout, stderr, exitCode, success }
78```
med
Arbitrary subprocess execution detected
The skill spawns subprocesses. Without a capability manifest declaring this, the skill could execute arbitrary commands.
rule: subprocess-executionline: 109CWE-78
▾
107| Need | Use | Why |
108|------|-----|-----|
109| Shell commands, scripts | `exec()` | Direct control, streaming |← spawns a subprocess outside declared capabilities
110| LLM-generated code | `runCode()` | Rich outputs, state persistence |
111| Build/test pipelines | `exec()` | Exit codes, stderr capture |
med
Arbitrary subprocess execution detected
The skill spawns subprocesses. Without a capability manifest declaring this, the skill could execute arbitrary commands.
rule: subprocess-executionline: 111CWE-78
▾
109| Shell commands, scripts | `exec()` | Direct control, streaming |
110| LLM-generated code | `runCode()` | Rich outputs, state persistence |
111| Build/test pipelines | `exec()` | Exit codes, stderr capture |← spawns a subprocess outside declared capabilities
112| Data analysis | `runCode()` | Charts, tables, pandas |
113
med
No capability manifest declared
The skill ships without a `manifest.yaml` or `capabilities` block in its frontmatter. Without a manifest, the runtime cannot enforce what this skill is permitted to do.
rule: no-manifest
▾
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