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84 lines
2.0 KiB
Markdown
84 lines
2.0 KiB
Markdown
<!--
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name: 'Data: Claude API reference — Go'
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description: Go SDK reference including installation, client initialization, basic requests, streaming, and manual agentic loop
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ccVersion: 2.1.47
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-->
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# Claude API — Go
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> **Note:** The Go SDK supports the Claude API. Tool runner and Agent SDK are not yet available for Go — use the manual agentic loop for tool use.
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## Installation
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\`\`\`bash
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go get github.com/anthropics/anthropic-sdk-go
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\`\`\`
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## Client Initialization
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\`\`\`go
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import (
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"github.com/anthropics/anthropic-sdk-go"
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"github.com/anthropics/anthropic-sdk-go/option"
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)
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// Default (uses ANTHROPIC_API_KEY env var)
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client := anthropic.NewClient()
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// Explicit API key
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client := anthropic.NewClient(
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option.WithAPIKey("your-api-key"),
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)
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\`\`\`
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---
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## Basic Message Request
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\`\`\`go
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response, err := client.Messages.New(context.TODO(), anthropic.MessageNewParams{
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Model: anthropic.ModelClaudeOpus4_5_20251101,
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MaxTokens: 1024,
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Messages: []anthropic.MessageParam{
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anthropic.NewUserMessage(anthropic.NewTextBlock("What is the capital of France?")),
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},
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})
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if err != nil {
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log.Fatal(err)
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}
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fmt.Println(response.Content[0].Text)
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\`\`\`
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---
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## Streaming
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\`\`\`go
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stream := client.Messages.NewStreaming(context.TODO(), anthropic.MessageNewParams{
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Model: anthropic.ModelClaudeOpus4_5_20251101,
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MaxTokens: 1024,
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Messages: []anthropic.MessageParam{
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anthropic.NewUserMessage(anthropic.NewTextBlock("Write a haiku")),
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},
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})
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for stream.Next() {
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event := stream.Current()
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switch eventVariant := event.AsAny().(type) {
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case anthropic.ContentBlockDeltaEvent:
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switch deltaVariant := eventVariant.Delta.AsAny().(type) {
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case anthropic.TextDelta:
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fmt.Print(deltaVariant.Text)
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}
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}
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}
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if err := stream.Err(); err != nil {
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log.Fatal(err)
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}
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\`\`\`
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---
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## Tool Use (Manual Loop)
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The Go SDK supports raw tool definitions via JSON schema. See the [shared tool use concepts](../shared/tool-use-concepts.md) for the tool definition format and agentic loop pattern.
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