BedrockModel

Defined in: src/models/bedrock.ts:324

AWS Bedrock model provider implementation.

Implements the Model interface for AWS Bedrock using the Converse Stream API. Supports streaming responses, tool use, prompt caching, and comprehensive error handling.

Example

const provider = new BedrockModel({
  modelConfig: {
    modelId: 'global.anthropic.claude-sonnet-4-6',
    maxTokens: 1024,
    temperature: 0.7
  },
  clientConfig: {
    region: 'us-west-2'
  }
})

const messages: Message[] = [
  { type: 'message', role: 'user', content: [{ type: 'textBlock', text: 'Hello!' }] }
]

for await (const event of provider.stream(messages)) {
  if (event.type === 'modelContentBlockDeltaEvent' && event.delta.type === 'textDelta') {
    process.stdout.write(event.delta.text)
  }
}

Extends

• Model<BedrockModelConfig>

Constructors

Constructor

new BedrockModel(options?): BedrockModel;

Defined in: src/models/bedrock.ts:358

Creates a new BedrockModel instance.

Parameters

Parameter	Type	Description
options?	BedrockModelOptions	Optional configuration for model and client

Returns

BedrockModel

Example

// Minimal configuration with defaults
const provider = new BedrockModel({
  region: 'us-west-2'
})

// With model configuration
const provider = new BedrockModel({
  region: 'us-west-2',
  modelId: 'global.anthropic.claude-sonnet-4-6',
  maxTokens: 2048,
  temperature: 0.8,
  cacheConfig: { strategy: 'auto' }
})

// With client configuration
const provider = new BedrockModel({
  region: 'us-east-1',
  clientConfig: {
    credentials: myCredentials
  }
})

Overrides

Model.constructor

Accessors

modelId

Get Signature

get modelId(): string;

Defined in: src/models/model.ts:205

The model ID from the current configuration, if configured.

Returns

string

Inherited from

Model.modelId

---

stateful

Get Signature

get stateful(): boolean;

Defined in: src/models/model.ts:221

Whether this model manages conversation state server-side.

When true, the server tracks conversation context across turns, so the SDK sends only the latest message instead of the full history. After each invocation, the agent’s local message history is cleared automatically.

Model providers that support server-side state management should override this to return true.

Returns

boolean

false by default

Inherited from

Model.stateful

Methods

updateConfig()

updateConfig(modelConfig): void;

Defined in: src/models/bedrock.ts:450

Updates the model configuration. Merges the provided configuration with existing settings.

Parameters

Parameter	Type	Description
modelConfig	BedrockModelConfig	Configuration object with model-specific settings to update

Returns

void

Example

// Update temperature and maxTokens
provider.updateConfig({
  temperature: 0.9,
  maxTokens: 2048
})

Overrides

Model.updateConfig

---

getConfig()

getConfig(): BedrockModelConfig;

Defined in: src/models/bedrock.ts:465

Retrieves the current model configuration.

Returns

BedrockModelConfig

The current configuration object

Example

const config = provider.getConfig()
console.log(config.modelId)

Overrides

Model.getConfig

---

countTokens()

countTokens(messages, options?): Promise<number>;

Defined in: src/models/bedrock.ts:479

Count tokens using Bedrock’s native CountTokens API.

Uses the same message format as the Converse API to get accurate token counts directly from the Bedrock service. Falls back to the base class heuristic on failure.

Parameters

Parameter	Type	Description
messages	Message[]	Array of conversation messages to count tokens for
options?	CountTokensOptions	Optional options containing system prompt and tool specs

Returns

Promise<number>

Total input token count

Overrides

Model.countTokens

---

stream()

stream(messages, options?): AsyncIterable<ModelStreamEvent>;

Defined in: src/models/bedrock.ts:535

Streams a conversation with the Bedrock model. Returns an async iterable that yields streaming events as they occur.

Parameters

Parameter	Type	Description
messages	Message[]	Array of conversation messages
options?	StreamOptions	Optional streaming configuration

Returns

AsyncIterable<ModelStreamEvent>

Async iterable of streaming events

Throws

{ContextWindowOverflowError} When input exceeds the model’s context window

Throws

{ModelThrottledError} When Bedrock service throttles requests

Example

const messages: Message[] = [
  { type: 'message', role: $1, content: [{ type: 'textBlock', text: 'What is 2+2?' }] }
]

const options: StreamOptions = {
  systemPrompt: 'You are a helpful math assistant.',
  toolSpecs: [calculatorTool]
}

for await (const event of provider.stream(messages, options)) {
  if (event.type === 'modelContentBlockDeltaEvent') {
    console.log(event.delta)
  }
}

Overrides

Model.stream

---

streamAggregated()

streamAggregated(messages, options?): AsyncGenerator<
  | ContentBlock
| ModelStreamEvent, StreamAggregatedResult, undefined>;

Defined in: src/models/model.ts:307

Streams a conversation with aggregated content blocks and messages. Returns an async generator that yields streaming events and content blocks, and returns the final message with stop reason and optional metadata.

This method enhances the basic stream() by collecting streaming events into complete ContentBlock and Message objects, which are needed by the agentic loop for tool execution and conversation management.

The method yields:

• ModelStreamEvent - Original streaming events (passed through)
• ContentBlock - Complete content block (emitted when block completes)

The method returns:

• StreamAggregatedResult containing the complete message, stop reason, and optional metadata

All exceptions thrown from this method are wrapped in ModelError to provide a consistent error type for model-related errors. Specific error subtypes like ContextWindowOverflowError, ModelThrottledError, and MaxTokensError are preserved.

Parameters

Parameter	Type	Description
messages	Message[]	Array of conversation messages
options?	StreamOptions	Optional streaming configuration

Returns

AsyncGenerator< | ContentBlock | ModelStreamEvent, StreamAggregatedResult, undefined>

Async generator yielding ModelStreamEvent | ContentBlock and returning a StreamAggregatedResult

Throws

ModelError - Base class for all model-related errors

Throws

ContextWindowOverflowError - When input exceeds the model’s context window

Throws

ModelThrottledError - When the model provider throttles requests

Throws

MaxTokensError - When the model reaches its maximum token limit

Inherited from

Model.streamAggregated