Bedrock provider

[tott]

Add AWS Bedrock Provider

This PR adds basic support for AWS Bedrock as an AI provider, enabling access to models from Anthropic, Amazon, Meta, Mistral, and more through a unified interface. This is likely not in a place to be fully merged as it requires further testing but it should help people looking for this in reference to #39, and potentially can serve as a starting point for a full-featured implementation

Features

Text Generation

• Support for Claude, Titan, Llama, Mistral, and other models
• Streaming via Bedrock's converseStream API
• Tool/function calling
• Structured output support with JSON validation

Embeddings

• Amazon Titan Embed Text
• Configurable dimensions

Image Generation

• Amazon Nova Canvas
• Amazon Titan Image Generator

Speech Transcription

• Amazon Nova Sonic

Implementation Details

Authentication
Supports three authentication methods:

1. IAM credentials (access key, secret key, session token)
2. Bearer token (AWS_BEARER_TOKEN_BEDROCK)
3. Default AWS credential chain (environment, ~/.aws/credentials, IAM roles)

Tool Calling

• Full multi-turn conversation loop with configurable maxSteps
• Automatic tool execution with invocation callbacks
• Token usage tracking across all tool calls

Message Formatting
Proper support for:

• AssistantMessage with tool calls
• ToolResultMessage for tool outputs
• UserMessage with document attachments
• Conversation history maintenance across tool loops

Configuration Example

'bedrock' => [
    'driver' => 'bedrock',
    'region' => env('AWS_BEDROCK_REGION', 'us-east-1'),
    'access_key_id' => env('AWS_ACCESS_KEY_ID'),
    'secret_access_key' => env('AWS_SECRET_ACCESS_KEY'),
    'session_token' => env('AWS_SESSION_TOKEN'),
    'use_default_credential_provider' => env('AWS_USE_DEFAULT_CREDENTIALS', true),
    'models' => [
        'text' => [
            'default' => 'us.anthropic.claude-sonnet-4-5-20250929-v1:0',
            'cheapest' => 'us.anthropic.claude-haiku-4-5-20250929-v1:0',
            'smartest' => 'us.anthropic.claude-opus-4-6-20250929-v1:0',
        ],
        'embeddings' => [
            'default' => 'amazon.titan-embed-text-v2:0',
            'dimensions' => 1024,
        ],
        'image' => [
            'default' => 'amazon.nova-canvas-v1:0',
        ],
        'transcription' => [
            'default' => 'amazon.nova-sonic-v1:0',
        ],
    ],
],

Usage Example

use Laravel\Ai\Facades\Ai;

  // Text generation
  $response = Ai::provider('bedrock')
      ->textProvider()
      ->text('Explain quantum computing');

  // With tools
  $agent = new MyAgent;
  $response = $agent
      ->provider('bedrock')
      ->prompt('What is the weather in Paris?');

  // Image generation
  $image = Ai::provider('bedrock')
      ->imageProvider()
      ->image('A serene mountain landscape', size: '16:9');

  // Embeddings
  $embeddings = Ai::provider('bedrock')
      ->embeddingProvider()
      ->embeddings(['Hello world', 'Goodbye world']);

Dependencies

Adds aws/aws-sdk-php: ^3.339 for AWS SDK integration.