---
title: "tool si.session.whoami"
description: "a token, a key, or a run's identity: the caller, with its scopes and its access scopes."
section: reference
address: /reference/tools/si-session-whoami
contract: 0476e35e6e275db5
---

# tool si.session.whoami

a token, a key, or a run's identity: the caller, with its scopes and its access scopes.

[figure: Over MCP, si.session.whoami takes WhoAmIInput and returns a card whose body is Caller.]

the caller, with its scopes and its access scopes. The call needs the read grant at the user rung.



| | |
|---|---|
| input | [WhoAmIInput](/concepts/whoamiinput) |
| result | a card whose body is [Caller](/concepts/caller) |
| read-only | yes |
| destructive | no |
| card address | `ui://scale-intelligence/cards/Caller` |
| HTTP route | [`/v1/session/whoami`](/reference/session/whoami) |





| field | type | required | note |
|---|---|---|---|
| `token` | `text` | no | never logged |
| `key` | `id` | no |  |
| `run` | `id` | no |  |