Function createStep

src/node/services/devToolsMiddleware.ts:301–332

(
    stepType: DevToolsStep["type"],
    params: LanguageModelV3CallOptions,
    model: LanguageModelV3
  )

  }

  async function createStep(
    stepType: DevToolsStep["type"],
    params: LanguageModelV3CallOptions,
    model: LanguageModelV3
  ): Promise<{ stepId: string; startedAtMs: number } | null> {
    try {
      const runMetadataId = extractRunMetadataId(params);
      await ensureRun(runMetadataId);

      const stepId = randomUUID();
      const stepNumber = (stepCounter += 1);
      const input = extractInput(params);

      await service.createStep(
        workspaceId,
        createEmptyStep(stepId, runId, stepNumber, stepType, model, input)
      );

      return {
        stepId,
        startedAtMs: Date.now(),
      };
    } catch (error) {
      log.warn("DevTools: failed to create step", {
        workspaceId,
        runId,
        stepType,
        error,
      });
      return null;
    }
  }

  function injectStepIdHeader(params: LanguageModelV3CallOptions, stepId: string): void {
    assert(stepId.trim().length > 0, "injectStepIdHeader requires a non-empty stepId");