spawn

Spawn N subagents that work on the same task in parallel, each in an isolated git worktree. When --template is provided, use the dispatch prompt from references/agent-templates.md instead of the default prompt below. Available templates: When using a template, replace all {variables} with values from the session config. Assign each agent a different strategy appropriate to the template and task — diverse strategies maximize the value of parallel exploration. Tell the user: - Load session config from .agenthub/sessions/{session-id}/config.yaml - For each agent 1..N: - Write task assignment to .agenthub/board/dispatch/ - Build agent prompt with task, constraints, and board write instructions - Launch ALL agents in a single message with multiple Agent tool calls: - Update session state to running via: - All agents in ONE message — spawn all Agent tool calls simultaneously for true parallelism - isolation: "worktree" is mandatory — each agent needs its own filesystem - Never modify session config after spawn — agents rely on stable configuration - Each agent gets a unique board post — dispatch posts are numbered sequentially - {N} agents launched in parallel - Each working in an isolated worktree - Monitor with /hub:status - Evaluate when done with /hub:eval