> ## 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.

# to

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

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

## Meaning and placement

### → secrets · additionalProperties → egress · items

The sanctioned sink · a tool id (`nika:fetch` · `nika:notify` · `mcp:<server>/<tool>`), `exec`, a provider-egress sink `infer` / `agent` (a secret in an infer/agent prompt), or `outputs` (the workflow boundary — a return value derived from the secret's response) · SPECIFIC (no cross-tool laundering).

| Property        | Declaration                                                                      |
| --------------- | -------------------------------------------------------------------------------- |
| Requirement     | Required in this object                                                          |
| Schema location | `/properties/secrets/additionalProperties/properties/egress/items/properties/to` |
| type            | "string"                                                                         |

**In the same object:** [host](/reference/language/words/host) · [host\_from\_self](/reference/language/words/host_from_self)

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

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