Arena

Portability (required)

This skill is part of the portable pstack pack.

1. Read the pstack capability contract and the adapter for the active coding agent before delegation.
2. Use parallel with implement helpers for writable candidates, review for the cross-judge, and verify for the synthesized result.
3. Keep candidate write scopes disjoint (worktrees or separate output directories). Never let N candidates share one mutable path.
4. Resolve models through model_role; never require a vendor-specific model identifier or helper type.
5. When helper spawning is unavailable, run candidates sequentially on the lead agent, keep their outputs separated, and state that the arena collapsed.

Purpose

Fan out N parallel attempts at the same task. Read every candidate end to end. Pick the strongest as the base. Graft the best ideas from the others into it. Verify the synthesized result.

Use swarm when the goal is independent coverage or aggregation. Use arena when the goal is one synthesized artifact chosen from competing candidates.

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