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USAIGE — Laravel AI SDK Usage Tracker

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> Observability for [Laravel AI SDK](https://laravel.com/docs/13.x/ai-sdk) interactions — run lifecycle, token counts, cost, and provider metadata, recorded automatically with two helpers.

```php
$run = ai_run('summarize-document');          // provider & model inferred from config/ai.php

$response = Ai::text('Summarize: ' . $document->content);

$usage = ai_usage($run, $response);
// AiRun   → status: completed, finished_at: now
// AiUsage → prompt_tokens: 180, completion_tokens: 67, total_tokens: 247
```

---

## Requirements

- PHP **8.5+**
- Laravel **11+**
- [`laravel/ai`](https://laravel.com/docs/13.x/ai-sdk) **^0.8**

---

## Installation

```bash
composer require laraveljutsu/usaige
php artisan migrate
```

Package auto-discovery registers the service provider and the `Usaige` facade. The `ai_run()` and `ai_usage()` helpers are available everywhere immediately.

---

## Usage

### The minimal call

`provider` and `model` are optional — USAIGE reads them from `config/ai.php` automatically:

```php
$run      = ai_run('generate-reply');
$response = Ai::text('Write a reply to: ' . $ticket->body);
$usage    = ai_usage($run, $response);
```

### How provider & model are resolved

USAIGE reads the same `config/ai.php` the SDK uses:

```php
// config/ai.php
'default' => 'openai',

'providers' => [
    'openai' => [
        'driver' => 'openai',
        'models' => [
            'text' => ['default' => 'gpt-4o-mini'],
        ],
        // ...
    ],
],
```

These three calls are equivalent when the config above is in place:

```php
$run = ai_run('summarize-document');
$run = ai_run('summarize-document', provider: 'openai');
$run = ai_run('summarize-document', provider: 'openai', model: 'gpt-4o-mini');
```

Explicit values always win. If no AI SDK config is present, `provider` and `model` are stored as `null`.

### Using the `Lab` enum

`provider` accepts `Laravel\Ai\Enums\Lab` directly — no string conversion needed:

```php
use Laravel\Ai\Enums\Lab;

$run = ai_run('summarize-document', provider: Lab::OpenAI);
$run = ai_run('summarize-document', provider: Lab::Anthropic, model: 'claude-sonnet-4-6');
```

### Explicit provider & model

```php
$run = ai_run('summarize-document', provider: 'anthropic', model: 'claude-sonnet-4-6');
```

### User ID

Resolved from `auth()->id()` by default. Override it per-call or globally:

```php
// Per-call override (queue jobs, impersonation, …)
$run = ai_run('translate', userId: $targetUser->id);
```

```php
// Global override — call once in AppServiceProvider::boot()
use Laraveljutsu\Usaige\Usaige;

Usaige::resolveUsersUsing(fn () => auth('api')->id());
```

### Metadata

Attach any app-specific identifiers as JSON:

```php
$run = ai_run('classify-ticket', metadata: [
    'team_id'   => $team->id,
    'ticket_id' => $ticket->id,
]);

$run->metadata['team_id']; // → 42
```

### Handling failures

```php
$run = ai_run('translate');

try {
    $response = Ai::text('Translate to FR: ' . $text);
    $usage    = ai_usage($run, $response);
} catch (Throwable $e) {
    $run->fail($e->getMessage());
    throw $e;
}
```

### Manual token overrides

For streaming accumulators or unsupported response shapes:

```php
$usage = ai_usage(
    $run,
    promptTokens:     1_240,
    completionTokens: 380,
    costUsd:          0.001620,
);
```

### Facade

```php
use Laraveljutsu\Usaige\Facades\Usaige;

$run   = Usaige::createRun('ocr-scan', model: 'gpt-4o');
$usage = Usaige::recordUsage($run, $response);
```

### Querying runs

```php
use Laraveljutsu\Usaige\Models\AiRun;

// All runs for the current user
AiRun::where('user_id', auth()->id())->with('usage')->latest()->get();

// Total tokens spent on a feature
AiRun::where('feature_key', 'summarize-document')
    ->join('ai_usages', 'ai_runs.id', '=', 'ai_usages.ai_run_id')
    ->sum('ai_usages.total_tokens');

// Failed runs in the last 24 hours
AiRun::where('status', 'failed')->where('started_at', '>=', now()->subDay())->get();

// Wall-clock duration
$run->durationMs(); // → 891
```

---

## Configuration

```bash
php artisan vendor:publish --tag=usaige-config
```

```php
// config/usaige.php
return [
    'path'       => 'usaige',   // dashboard URL
    'middleware' => [],          // e.g. ['auth', 'can:admin']
    'table_names' => [
        'ai_runs'   => 'ai_runs',
        'ai_usages' => 'ai_usages',
    ],
];
```

> **Note:** Don't put closures in the published config — Laravel can't cache them. Use `Usaige::resolveUsersUsing()` and `Usaige::auth()` in `AppServiceProvider::boot()` instead.

---

## Dashboard

USAIGE ships a web dashboard at `/usaige` listing all runs with status, tokens, cost, and duration.

### Access control

**Via config** (middleware-based):

```php
// config/usaige.php
'middleware' => ['auth'],              // require login
'middleware' => ['auth', 'can:admin'], // Gate / Policy
'middleware' => ['auth:admin'],        // custom guard
```

**Via callback** (code-based):

```php
Usaige::auth(fn ($request) => $request->user()?->isAdmin() ?? false);
```

Both can be combined — the callback runs after any configured middleware.

---

## API Reference

### `ai_run()`

Creates an `AiRun` with `status = running` and `started_at = now()`.

| Parameter | Type | Default | Description |
|---|---|---|---|
| `$feature` | `string` | — | Stable key identifying the AI feature (e.g. `'summarize-document'`). |
| `$provider` | `Lab\|string\|null` | `null` | Provider name or `Lab` enum. Inferred from `config/ai.php` when `null`. |
| `$model` | `?string` | `null` | Model identifier. Inferred from `config/ai.php` when `null`. |
| `$userId` | `?int` | `null` | Overrides the user resolver. |
| `$metadata` | `array` | `[]` | Arbitrary key-value pairs stored as JSON. |
| `$inputHash` | `?string` | `null` | Pre-computed hash of the prompt (for deduplication). |

### `ai_usage()`

Calls `$run->complete()`, extracts tokens from the response, and returns a new `AiUsage`.

| Parameter | Type | Default | Description |
|---|---|---|---|
| `$run` | `AiRun` | — | The run returned by `ai_run()`. |
| `$response` | `mixed` | `null` | AI SDK response — tokens extracted automatically. |
| `$promptTokens` | `?int` | `null` | Override the extracted prompt token count. |
| `$completionTokens` | `?int` | `null` | Override the extracted completion token count. |
| `$costUsd` | `?float` | `null` | Cost in USD. Not computed automatically. |

### `AiRun` methods

| Method | Description |
|---|---|
| `complete(): void` | Sets `status = completed`, `finished_at = now()`. Called internally by `ai_usage()`. |
| `fail(string $message): void` | Sets `status = failed`, stores the error, `finished_at = now()`. |
| `durationMs(): ?int` | Wall-clock duration in milliseconds. `null` if not finished. |
| `usage(): HasOne` | Relationship to the associated `AiUsage`. |

---

## Token Extraction

`UsageExtractor` detects the response shape automatically:

| SDK / Shape | Prompt field | Completion field |
|---|---|---|
| Laravel AI SDK | `usage->inputTokens` | `usage->outputTokens` |
| OpenAI PHP SDK | `usage->prompt_tokens` | `usage->completion_tokens` |
| Plain array | `['usage']['prompt_tokens']` | `['usage']['completion_tokens']` |
| Unknown / null | `0` — override manually | `0` — override manually |

---

## Schema

### `ai_runs`

| Column | Type | Notes |
|---|---|---|
| `id` | bigint | Primary key |
| `user_id` | bigint, nullable | No FK — works with any auth setup |
| `feature_key` | string | Developer-defined feature identifier |
| `status` | string | `running` · `completed` · `failed` |
| `provider` | string, nullable | e.g. `openai`, `anthropic` |
| `model` | string, nullable | e.g. `gpt-4o-mini` |
| `input_hash` | string, nullable | For deduplication |
| `started_at` | timestamp, nullable | Set by `ai_run()` |
| `finished_at` | timestamp, nullable | Set by `complete()` or `fail()` |
| `error_message` | text, nullable | Set by `fail()` |
| `metadata` | json, nullable | App-specific context |
| `created_at` / `updated_at` | timestamp | |

### `ai_usages`

| Column | Type | Notes |
|---|---|---|
| `id` | bigint | Primary key |
| `ai_run_id` | bigint | FK → `ai_runs`, cascade delete |
| `prompt_tokens` | uint | Defaults to 0 |
| `completion_tokens` | uint | Defaults to 0 |
| `total_tokens` | uint, nullable | Sum of prompt + completion |
| `cost_usd` | decimal(10, 6) | 6 decimal places for sub-cent precision |
| `created_at` / `updated_at` | timestamp | |

---

## Testing

```bash
./vendor/bin/pest
```

In your application tests, use `RefreshDatabase` and call the helpers as normal:

```php
it('tracks the summarize run', function () {
    $run   = ai_run('summarize', model: 'gpt-4o-mini');
    $usage = ai_usage($run, promptTokens: 100, completionTokens: 40);

expect($run->fresh()->status->value)->toBe('completed')
        ->and($usage->total_tokens)->toBe(140);
});
```

---

## License

MIT — [Ludovic Guenet](https://github.com/ludoguenet)

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