Strands Agents
Swift SDK

What is Strands Agents?

Strands Agents is an open-source SDK by AWS for building AI agents. An agent combines a model, tools, and a system prompt inside a reasoning loop. The loop receives user input, calls the model, executes any tools the model requests, and repeats until it produces a final answer.

This Swift SDK is at feature parity with the official Python and TypeScript SDKs, with additional support for on-device inference via MLX and native Apple audio I/O for voice agents.

Explore the Docs

Quick Example

import StrandsAgents
import StrandsBedrockProvider

/// Count the number of words in a block of text.
@Tool
func wordCount(text: String) -> Int {
    text.split(whereSeparator: \.isWhitespace).count
}

let agent = Agent(
    model: try BedrockProvider(config: BedrockConfig(
        modelId: "us.anthropic.claude-sonnet-4-20250514-v1:0"
    )),
    tools: [wordCount]
)

let result = try await agent.run("How many words are in the Gettysburg Address?")
print(result.output)

Platform Support