andAll

Run multiple steps in parallel and wait for all to complete. Perfect for batch processing, multiple API calls, or any operations that can run simultaneously.

Quick Start

Run three operations at the same time:

import { createWorkflowChain, andThen, andAll } from "@voltagent/core";
import { z } from "zod";

const workflow = createWorkflowChain({
  id: "fetch-user-data",
  input: z.object({ userId: z.string() }),
}).andAll([
  // All three API calls run at the same time
  andThen({
    id: "fetch-profile",
    execute: async ({ data }) => {
      const profile = await fetchUserProfile(data.userId);
      return { profile };
    },
  }),
  andThen({
    id: "fetch-posts",
    execute: async ({ data }) => {
      const posts = await fetchUserPosts(data.userId);
      return { posts };
    },
  }),
  andThen({
    id: "fetch-stats",
    execute: async ({ data }) => {
      const stats = await fetchUserStats(data.userId);
      return { stats };
    },
  }),
]);

// All three requests happen in parallel
const result = await workflow.run({ userId: "user-123" });
// Result: { profile: {...}, posts: [...], stats: {...} }

How It Works

1. All steps start at the same time
2. Each step gets the same input data
3. Waits for ALL steps to finish
4. Merges all results into one object
5. If any step fails, the whole thing fails

Think of it like ordering from multiple restaurants at once - you wait for all deliveries before eating.

Function Signature

.andAll([step1, step2, step3])  // Array of steps to run in parallel

Common Patterns

Parallel API Calls

.andAll([
  andThen({
    id: "api-1",
    execute: async ({ data }) => {
      const result = await fetch(`/api/service1/${data.id}`);
      return { service1: await result.json() };
    }
  }),
  andThen({
    id: "api-2",
    execute: async ({ data }) => {
      const result = await fetch(`/api/service2/${data.id}`);
      return { service2: await result.json() };
    }
  })
])

Parallel AI Agents

.andAll([
  andAgent(
    ({ data }) => `Summarize: ${data.text}`,
    summaryAgent,
    { schema: z.object({ summary: z.string() }) }
  ),
  andAgent(
    ({ data }) => `Extract keywords from: ${data.text}`,
    keywordAgent,
    { schema: z.object({ keywords: z.array(z.string()) }) }
  ),
  andAgent(
    ({ data }) => `Analyze sentiment: ${data.text}`,
    sentimentAgent,
    { schema: z.object({ sentiment: z.string() }) }
  )
])

Batch Processing

const items = ["item1", "item2", "item3"];

.andAll(
  items.map(item =>
    andThen({
      id: `process-${item}`,
      execute: async () => {
        const result = await processItem(item);
        return { [item]: result };
      }
    })
  )
)

Error Handling

If any step fails, andAll fails immediately:

.andAll([
  andThen({
    id: "will-succeed",
    execute: async () => ({ success: true })
  }),
  andThen({
    id: "will-fail",
    execute: async () => {
      throw new Error("Failed!");
    }
  }),
  andThen({
    id: "also-succeeds",
    execute: async () => ({ alsoSuccess: true })
  })
])
// Workflow stops here - error thrown

To handle failures gracefully, catch errors in individual steps:

.andAll([
  andThen({
    id: "safe-api-call",
    execute: async ({ data }) => {
      try {
        const result = await riskyApiCall(data.id);
        return { apiResult: result };
      } catch (error) {
        return { apiResult: null, error: error.message };
      }
    }
  })
])

Suspend & Resume

andAll supports suspension - if any step suspends, the entire parallel operation suspends:

.andAll([
  andThen({
    id: "auto-process",
    execute: async ({ data }) => ({ processed: true })
  }),
  andThen({
    id: "needs-approval",
    execute: async ({ data, suspend, resumeData }) => {
      if (resumeData) {
        return { approved: resumeData.approved };
      }
      await suspend("Needs approval");
    }
  })
])

Performance Tips

Sequential vs Parallel

// Sequential: 3 seconds total
.andThen({ execute: async () => await api1() }) // 1s
.andThen({ execute: async () => await api2() }) // 1s
.andThen({ execute: async () => await api3() }) // 1s

// Parallel: 1 second total
.andAll([
  andThen({ execute: async () => await api1() }), // 1s
  andThen({ execute: async () => await api2() }), // 1s
  andThen({ execute: async () => await api3() })  // 1s
])

Best Practices

1. Only parallelize independent operations

   // Good: No dependencies
   .andAll([fetchUser(), fetchPosts(), fetchComments()])
   
   // Bad: Second depends on first
   .andAll([createUser(), assignUserRole()])

2. Limit parallelism

   // Good: Reasonable number
   .andAll([api1(), api2(), api3()])
   
   // Bad: Too many
   .andAll(hundredsOfApiCalls)

3. Handle errors appropriately

   // Wrap risky operations
   .andAll([
     safeWrapper(riskyOperation1),
     safeWrapper(riskyOperation2)
   ])

Comparison with andRace

Feature	andAll	andRace
Waits for	All steps	First step
Use case	Need all results	Need fastest result
Failure	Fails if any fail	Succeeds if any succeed
Result	Merged from all	From first complete

Next Steps

• Learn about andRace for "first wins" scenarios
• Explore andThen for sequential processing
• See andWhen for conditional execution
• Execute workflows via REST API