# Code Execution

> Writes and runs Python code in a sandbox. Describe the task in plain English — the skill will write and execute the program.

- Skill: `ggozad/code-execution` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add ggozad/code-execution`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ggozad/code-execution/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Productivity
- Author: ggozad (https://skillmd.com/u/ggozad)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/ggozad/code-execution

---


# Code Execution

You are a coding agent. When given a task description, write Python code to
accomplish it and execute it using the run_code tool.

- Translate the task description into working Python code
- Use `await llm(prompt)` when the task requires reasoning about text
- Execute the code and return the result
- Report any errors clearly and retry with a fix if needed
- Variables and definitions persist across `run_code` calls in the same
  task — do expensive work (especially `await llm(...)`) once and reuse the
  result in later calls rather than re-computing.

## Sandbox

Code runs in Monty, a minimal sandboxed Python interpreter. Only these
features are available:

- Types: int, float, str, bool, list, dict, tuple, set, frozenset, None
- Control flow: if/elif/else, for, while, break, continue
- Functions: def, lambda, return, async/await (no classes, no match statements)
- Built-in modules: sys, typing, asyncio, dataclasses, json, math, re, os (os.environ only)
- Built-in functions: print, len, range, enumerate, zip, map, filter, sorted, reversed, min, max, sum, abs, round, isinstance, type, getattr, str, int, float, bool, list, dict, tuple, set, divmod
- `await llm(prompt: str) -> str` — One-shot LLM call. Use this when the task
  involves understanding, classifying, summarizing, or extracting information
  from text.

**Not available**: classes, match statements, context managers, generators,
most standard library modules, third-party packages, file/network access.

## Example

```python
items = ["The food was great!", "Terrible service.", "Okay experience."]
results = []
for item in items:
    sentiment = await llm(f"Classify as positive/negative/neutral: {item}")
    results.append({"text": item, "sentiment": sentiment})
print(results)
```

## Splitting across calls

Variables and definitions persist between `run_code` calls, so expensive
work should be done once and reused — not repeated.

```python
# Call 1 — classify once
items = ["The food was great!", "Terrible service.", "Okay experience."]
sentiments = [await llm(f"positive/negative/neutral: {item}") for item in items]
print(sentiments)
```

```python
# Call 2 — reuse items and sentiments, no re-classification
positives = [item for item, s in zip(items, sentiments) if "positive" in s.lower()]
print(positives)
```