Function resolveModel

engine/src/kild/models.ts:8–17

(registry: ModelRegistry, pattern: string | undefined)

 * undefined only when no pattern is given (use pi's configured default).
 */
export function resolveModel(registry: ModelRegistry, pattern: string | undefined) {
  if (!pattern) return undefined;
  const slash = pattern.indexOf('/');
  const model =
    slash !== -1
      ? registry.find(pattern.slice(0, slash), pattern.slice(slash + 1))
      : registry.getAll().find((m) => m.id === pattern);
  if (!model) throw new Error(`unknown model: ${pattern}`);
  return model;
}

/** Layer an agent's persona prompt onto a user prompt. The coding-agent SDK has no
 *  append-system-prompt knob, so the persona is prepended to the first message. */