arena

# Arena On Codex, read the [platform mapping](../poteto-mode/references/codex-tools.md), including its per-skill notes, before following this skill. 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. ## Start Open a todolist with one entry per phase before launching anything. 1. Frame 2. Fan out 3. Cross-judge 4. Pick 5. Graft 6. Verify ## Phase A: Frame The N candidates will receive the same prompt, so the prompt is the contract. 1. State the artifact each candidate is producing. 2. Derive the rubric. State what success looks like for *this* task, then turn it into 3-6 concrete gradeable criteria. The rubric is the picker's tool in Phase D. Candidates only see the task. 3. Pick the runners. Use the `arena runners` line in `pstack-models.md`. If the sheet or that line is missing, run one each on the defaults in [Models](#models). An `auto` or `inherit-parent` entry in this line or the cross-judge line means the parent model, so omit `model` for it. If the `Agent` tool rejects a configured entry, run that seat on its family's default and say so. Families go by model name, such as Opus, Fable, or Sonnet. With no family match, use the single-role default in [Models](#models). If it rejects a default, use the closest valid slug of the same family from its error message. Spawn more when the arena covers multiple design directions. Same mo...