Function buildAdditionalStep

src/cascade-native-bridge.js:871–882

(kind, args)

 * Returns null if `kind` has no encoder (caller should fall back).
 */
export function buildAdditionalStep(kind, args) {
  const meta = CASCADE_STEP[kind];
  const builder = STEP_BODY_BUILDER[kind];
  if (!meta || !builder) return null;
  const body = builder(args || {});
  // CortexTrajectoryStep envelope: type=1, status=4, oneof step body
  return Buffer.concat([
    writeVarintField(1, meta.typeEnum),
    writeVarintField(4, CASCADE_STEP_STATUS_DONE),
    writeMessageField(meta.oneofField, body),
  ]);
}

// ─── Reverse: parse cascade trajectory step → OpenAI tool_call ────────
//