### Install OpenSpec CLI

Source: https://openspec.dev/

Install the OpenSpec command-line interface globally using npm.

```bash
npm install -g @fission-ai/openspec@latest
```

--------------------------------

### Example Spec Delta

Source: https://openspec.dev/

Illustrates a spec delta showing changes in requirements for session expiration. This format helps understand system modifications and reviewer comprehension.

```markdown
openspec/specs/auth-session/spec.md
### Requirement: Session expiration
- The system SHALL expire sessions after a configured duration.
+ The system SHALL support configurable session expiration periods.
#### Scenario: Default session timeout
- GIVEN a user has authenticated
- - WHEN 24 hours pass without activity
+ - WHEN 24 hours pass without "Remember me"
- THEN invalidate the session token
+ #### Scenario: Extended session with remember me
+ - GIVEN user checks "Remember me" at login
+ - WHEN 30 days have passed
+ - THEN invalidate the session token
+ - AND clear the persistent cookie
```

--------------------------------

### OpenSpec Specs Directory Structure

Source: https://openspec.dev/

Shows the directory structure for OpenSpec specifications, organized by capability. This structure aids in understanding the system and maintaining context.

```bash
$ tree openspec/specs/
openspec/specs/
├── auth-login/
│ └── spec.md
├── auth-session/
│ └── spec.md
├── checkout-cart/
│ └── spec.md
└── checkout-payment/
└── spec.md
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.