Tool/Agent as a Workflow step ✅

This example demonstrates how to create and integrate a tool or an agent as a workflow step. Kastrax provides a createStep helper function which accepts either a step or agent and returns an object which satisfies the Step interface.

Define Interop Workflow ✅

Defines a workflow which takes an agent and tool as a step.

workflows/interop-workflow.ts


import { createWorkflow, createStep } from '@kastrax/core/workflows/vNext'
import { weatherTool } from '../tools'
import { weatherReporterAgent } from '../agents'
import { z } from 'zod'
 
const fetchWeather = createStep(weatherTool)
const reportWeather = createStep(weatherReporterAgent)
 
const weatherWorkflow = createWorkflow({
  steps: [fetchWeather, reportWeather],
  id: 'weather-workflow',
  inputSchema: z.object({
    location: z.string().describe('The city to get the weather for'),
  }),
  outputSchema: z.object({
    text: z.string(),
  }),
})
  .then(fetchWeather)
  .then(
    createStep({
      id: 'report-weather',
      inputSchema: fetchWeather.outputSchema,
      outputSchema: z.object({
        text: z.string(),
      }),
      execute: async ({ inputData, kastrax }) => {
        const prompt = 'Forecast data: ' + JSON.stringify(inputData)
        const agent = kastrax.getAgent('weatherReporterAgent')
        const result = await agent.generate([
          {
            role: 'user',
            content: prompt,
          },
        ])
        return { text: result.text }
      },
    })
  )
 
weatherWorkflow.commit()
 
export { weatherWorkflow }

Register Workflow instance with Kastrax class ✅

index.ts


import { Kastrax } from '@kastrax/core/kastrax'
import { createLogger } from '@kastrax/core/logger'
import { weatherWorkflow } from './workflows'
 
const kastrax = new Kastrax({
  vnext_workflows: {
    weatherWorkflow,
  },
  logger: createLogger({
    name: 'Kastrax',
    level: 'info',
  }),
})
 
export { kastrax }

Execute the workflow ✅

Here, we’ll get the weather workflow from the kastrax instance, then create a run and execute the created run with the required inputData.

exec.ts


import { kastrax } from "./"
 
const workflow = kastrax.vnext_getWorkflow('weatherWorkflow')
const run = workflow.createRun()
 
const result = await run.start({ inputData: { location: "Lagos" } })
console.dir(result, { depth: null })