subagent-spawn-command-builder

name	subagent-spawn-command-builder
description	Build sessions_spawn command payloads from JSON profiles. Use when you want reusable subagent profiles (model/thinking/timeout/cleanup/agentId/label) and command-ready JSON without executing spawn.

subagent-spawn-command-builder

Generate sessions_spawn payload JSON from profile config. This skill does not execute sessions_spawn; it only builds payload/command JSON.

Files

• Profile template: state/spawn-profiles.template.json
• Active profile config: state/spawn-profiles.json
• Builder script: scripts/build_spawn_payload.mjs
• Builder log: state/build-log.jsonl

Supported sessions_spawn parameters

• task (required)
• label (optional)
• agentId (optional)
• model (optional)
• thinking (optional)
• runTimeoutSeconds (optional)
• cleanup (keep|delete, optional)

Setup

cp skills/subagent-spawn-command-builder/state/spawn-profiles.template.json \
   skills/subagent-spawn-command-builder/state/spawn-profiles.json

Then edit spawn-profiles.json.

Generate payload

skills/subagent-spawn-command-builder/scripts/build_spawn_payload.mjs \
  --profile heartbeat \
  --task "Analyze recent context and return a compact summary" \
  --label heartbeat-test

The script prints JSON directly usable for sessions_spawn.

Merge/priority rule

Value resolution order is:

1. CLI option (--model, --thinking, etc.)
2. Profile value (profiles.<name>.*)
3. Defaults value (defaults.*)

task always comes from CLI --task.

CLI options

Note: this builder is Node.js (.mjs) based. If generated tasks include Python execution steps, write commands with python3 (not python).

• --profile (required)
• --task (required)
• --label
• --agent-id
• --model
• --thinking
• --run-timeout-seconds
• --cleanup keep|delete