> ## Documentation Index
> Fetch the complete documentation index at: https://docs.nika.sh/llms.txt
> Use this file to discover all available pages before exploring further.

# max_parallel

> Contract, placement, related fields and source examples for this Nika YAML field.

[Language reference](/reference/language/overview) / `max_parallel`

## Meaning and placement

### task → for\_each

Cap concurrent iterations · default unbounded · 1 = sequential.

| Property        | Declaration                                               |
| --------------- | --------------------------------------------------------- |
| Requirement     | Optional in this object                                   |
| Schema location | `/$defs/task/properties/for_each/properties/max_parallel` |
| type            | "integer"                                                 |
| minimum         | 1                                                         |

**In the same object:** [fail\_fast](/reference/language/words/fail_fast) · [items](/reference/language/words/items)

[Schema source (use the pointer above)](https://github.com/supernovae-st/nika-spec/blob/c5ebbb7b862b68bc6cf7235efba61173b844afc6/schemas/workflow.schema.json)

## In a source template

Excerpt from `templates/fanout.nika.yaml`, source lines 100–109. This is a fragment, not a runnable workflow.

```yaml illustration theme={"system"}
      discover: ${{ tasks.discover.output }}
    for_each:
      items: ${{ with.discover }}
      max_parallel: 8
      fail_fast: false
    on_error:
      recover: null                 # an unreadable item yields null · the batch lives
    invoke:
      tool: "nika:read"
      args: { path: "${{ item }}" }
```

### Templates containing this field

| Template                     | Source                                                                                                                               |
| ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------ |
| `templates/fanout.nika.yaml` | [Line 103](https://github.com/supernovae-st/nika-spec/blob/c5ebbb7b862b68bc6cf7235efba61173b844afc6/templates/fanout.nika.yaml#L103) |

These are literal key occurrences in the source files, not an execution or conformance claim. [How to instantiate a template](/guides/templates).

## Contract and implementation

This page projects the named specification revision. Check [released engine status](/reference/status) and [the validation workflow](/guides/agent-authoring) before running a file. An optional field is not evidence that every engine supports every value.

Canonical identity: `language:word:max_parallel`. Spec revision: [`c5ebbb7b862b`](https://github.com/supernovae-st/nika-spec/tree/c5ebbb7b862b68bc6cf7235efba61173b844afc6).

[How documentation stays connected](/reference/knowledge-system).