ollie/tools/subagent_spawn

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#!/usr/bin/env bash
# description: Spawn N subagents with a shared prompt, wait for all to complete, return concatenated results (fork-join).
# Args: [-n N] [-agent A] [-backend B] [-model M] [-cwd DIR] [-keep] <prompt...>
# Output: concatenated results from all subagents, in submission order. With -n > 1, results are separated by === {id} === headers.
set -euo pipefail
OLLIE="${OLLIE:-$HOME/mnt/ollie}"
die() { printf 'subagent_spawn: %s\n' "$*" >&2; exit 1; }
n=1; agent=; backend=; model=; cwd=; keep=0
while [ $# -gt 0 ]; do
case $1 in
-n) n=$2; shift ;;
-agent) agent=$2; shift ;;
-backend) backend=$2; shift ;;
-model) model=$2; shift ;;
-cwd) cwd=$2; shift ;;
-keep) keep=1 ;;
--) shift; break ;;
-*) die "unknown flag: $1" ;;
*) break ;;
esac
shift
done
[ $# -eq 0 ] && die "prompt required"
prompt="$*"
cwd="${cwd:-$(pwd)}"
base="spawn-$(date +%s%N)-$$"
# Submit all jobs as one parallel spec.
{
printf 'name=%s\n' "$base"
printf 'cwd=%s\n' "$cwd"
[ -n "$agent" ] && printf 'agent=%s\n' "$agent"
[ -n "$backend" ] && printf 'backend=%s\n' "$backend"
[ -n "$model" ] && printf 'model=%s\n' "$model"
printf 'parallel=%s\n' "$n"
printf -- '---\n'
printf '%s\n' "$prompt"
} > "$OLLIE/b/new" || die "failed to submit jobs"
# Fork: poll each job's status in a background subshell, write result to tmpdir.
tmpdir=$(mktemp -d)
trap 'rm -rf "$tmpdir"' EXIT
declare -a pids
for i in $(seq 0 $((n - 1))); do
id="${base}-${i}"
(
while true; do
status=$(tr -d '[:space:]' < "$OLLIE/b/$id/status" 2>/dev/null) || { sleep 0.05; continue; }
case "$status" in
done*) cat "$OLLIE/b/$id/result" 2>/dev/null > "$tmpdir/$i"; break ;;
failed*) printf 'error: subagent %s failed: %s\n' "$id" "$status" > "$tmpdir/$i"; break ;;
*) sleep 0.05 ;;
esac
done
) &
pids[$i]=$!
done
# Join: wait for all pollers.
for i in $(seq 0 $((n - 1))); do
wait "${pids[$i]}"
done
# Collect results in submission order.
for i in $(seq 0 $((n - 1))); do
id="${base}-${i}"
[ "$n" -gt 1 ] && printf '=== %s ===\n' "$id"
cat "$tmpdir/$i" 2>/dev/null || true
[ "$keep" -eq 0 ] && rm -r "$OLLIE/b/$id" 2>/dev/null || true
done