> ## Documentation Index
> Fetch the complete documentation index at: https://gofastmcp.com/llms.txt
> Use this file to discover all available pages before exploring further.
# credentials
# `fastmcp.cli.deploy.credentials`
Restricted Horizon credential storage and resolution.
## Functions
### `resolve_credential`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
resolve_credential(store: CredentialStore) -> ResolvedCredential
```
Resolve environment, stored, then interactive credentials.
### `revoke_and_clear_credential`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
revoke_and_clear_credential(client: HorizonClient, store: CredentialStore) -> None
```
Attempt remote revocation and always remove the stored credential.
## Classes
### `AuthenticationRequiredError`
No Horizon credential is available without interactive authorization.
### `AuthState`
**Methods:**
#### `require_nonempty_api_key`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
require_nonempty_api_key(cls, value: SecretStr) -> SecretStr
```
### `ResolvedCredential`
### `CredentialStore`
Persist the active personal Horizon API key.
**Methods:**
#### `load`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
load(self) -> SecretStr | None
```
#### `save`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
save(self, api_key: SecretStr | str) -> None
```
#### `save_for_origin`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
save_for_origin(self, api_key: SecretStr | str) -> None
```
Save a key only while its issuing Horizon origin is active.
#### `clear_if_matches`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
clear_if_matches(self, api_key: SecretStr | str) -> None
```
Clear a key only while its Horizon origin and value are active.
#### `clear`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
clear(self) -> None
```