---
title: "tool si.act.deepen"
description: "an observation, and the depth: fetched in full, or given meaning: a deepening."
section: reference
address: /reference/tools/si-act-deepen
contract: 0476e35e6e275db5
---

# tool si.act.deepen

an observation, and the depth: fetched in full, or given meaning: a deepening.

[figure: Over MCP, si.act.deepen takes DeepenInput and returns a card whose body is Deepening.]

a deepening. The call needs the act grant at the strategy rung.



| | |
|---|---|
| input | [DeepenInput](/concepts/deepeninput) |
| result | a card whose body is [Deepening](/concepts/deepening) |
| read-only | no |
| destructive | yes |
| card address | `ui://scale-intelligence/cards/Deepening` |
| HTTP route | [`/v1/act/deepen`](/reference/act/deepen) |





| field | type | required | note |
|---|---|---|---|
| `observation` | `id` | yes |  |
| `depth` | `one of fetch \| embed \| both` | yes |  |
| `asked_by` | [UnitRef](/concepts/unitref) | yes |  |