> ## 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.

# workflow

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

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

## Meaning and placement

### invoke

Compose another workflow (spec 14) · a STATIC target: a filesystem path OR registry:owner/name\@version (pinned). A templated target is refused at check (NIKA-COMP-001). Exactly one of tool: | workflow: (the invoke tagged union · G21).

| Property        | Declaration                         |
| --------------- | ----------------------------------- |
| Requirement     | Optional in this object             |
| Schema location | `/$defs/invoke/properties/workflow` |
| type            | "string"                            |

**In the same object:** [args](/reference/language/words/args) · [tool](/reference/language/words/tool)

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

## Examples

No matching source-template occurrence is recorded in this projection. [Write a workflow](/guides/templates) or consult the schema declaration above.

## 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:workflow`. Spec revision: [`c5ebbb7b862b`](https://github.com/supernovae-st/nika-spec/tree/c5ebbb7b862b68bc6cf7235efba61173b844afc6).

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