Setup & Installation
openclaw skills install @paulgnz/xpr-code-sandbox
Or with the ClawHub CLI, for registry-managed skill folders outside a full OpenClaw workspace:
npx clawhub install xpr-code-sandbox
What This Skill Does
Runs JavaScript code in an isolated V8 sandbox with no network or filesystem access. Supports both full scripts via `execute_js` and quick single-expression evaluation via `eval_expression`. Data is passed in via JSON input and results are returned directly.
Lets an agent perform arbitrary computation mid-workflow without spinning up a separate runtime or exposing the host environment.
When to use it
- Calculate compound interest across a loan schedule
- Transform and reshape a JSON API response
- Validate a sorting algorithm before deploying
- Convert a CSV of numbers into aggregated statistics
- Compute date differences and format timestamps
Example Workflow
Here's how your AI assistant might use this skill in practice.
INPUT
User asks: 'Given this sales CSV, calculate total revenue per region and return sorted descending'
AGENT
- 1Parse the CSV using the structured-data skill's parse_csv tool
- 2Pass the parsed rows as JSON via the input parameter to execute_js
- 3Write a script that groups rows by region and sums revenue values
- 4Sort the resulting object entries by value descending
- 5Return the formatted result and store it with store_deliverable
OUTPUT
A JSON array of { region, totalRevenue } objects sorted highest to lowest