# Parallel Batch Executor 1 Always Set A Default

> Sub-skill of parallel-batch-executor: 1. Always Set a Default (+4).

- Skill: `vamseeachanta/parallel-batch-executor-1-always-set-a-default` (Agent Skill)
- Install (CLI): `npx skillmds@latest add vamseeachanta/parallel-batch-executor-1-always-set-a-default`
- Raw SKILL.md: https://api.skillmd.com/api/skills/vamseeachanta/parallel-batch-executor-1-always-set-a-default/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: vamseeachanta (https://skillmd.com/u/vamseeachanta)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/vamseeachanta/parallel-batch-executor-1-always-set-a-default

---


# 1. Always Set a Default (+4)

## 1. Always Set a Default

```bash
PARALLEL="${PARALLEL:-5}"
```


## 2. Validate Input

```bash
[[ $PARALLEL -gt 0 ]] || die "Parallelism must be positive"
[[ $PARALLEL -le 50 ]] || log_warning "High parallelism may overwhelm system"
```


## 3. Handle Failures Gracefully

```bash
# Don't use set -e with xargs - it will mask failures
# Instead, track failures explicitly
```


## 4. Log Everything

```bash
# Create per-task logs for debugging
log_file="$LOG_DIR/task_$(date +%s)_$$.log"
```


## 5. Clean Up Resources

```bash
trap cleanup EXIT INT TERM
```