Add conversation loop

go.mod

@@ -0,0 +1,12 @@
+module agent
+
+go 1.24.2
+
+require github.com/anthropics/anthropic-sdk-go v1.3.0
+
+require (
+	github.com/tidwall/gjson v1.14.4 // indirect
+	github.com/tidwall/match v1.1.1 // indirect
+	github.com/tidwall/pretty v1.2.1 // indirect
+	github.com/tidwall/sjson v1.2.5 // indirect
+)

go.sum

@@ -0,0 +1,12 @@
+github.com/anthropics/anthropic-sdk-go v1.3.0 h1:KroW4oDT3KzFT71d3bnu4DxLFAEPvY+d1c6z2CrOz/s=
+github.com/anthropics/anthropic-sdk-go v1.3.0/go.mod h1:AapDW22irxK2PSumZiQXYUFvsdQgkwIWlpESweWZI/c=
+github.com/tidwall/gjson v1.14.2/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
+github.com/tidwall/gjson v1.14.4 h1:uo0p8EbA09J7RQaflQ1aBRffTR7xedD2bcIVSYxLnkM=
+github.com/tidwall/gjson v1.14.4/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
+github.com/tidwall/match v1.1.1 h1:+Ho715JplO36QYgwN9PGYNhgZvoUSc9X2c80KVTi+GA=
+github.com/tidwall/match v1.1.1/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
+github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
+github.com/tidwall/pretty v1.2.1 h1:qjsOFOWWQl+N3RsoF5/ssm1pHmJJwhjlSbZ51I6wMl4=
+github.com/tidwall/pretty v1.2.1/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
+github.com/tidwall/sjson v1.2.5 h1:kLy8mja+1c9jlljvWTlSazM7cKDRfJuR/bOJhcY5NcY=
+github.com/tidwall/sjson v1.2.5/go.mod h1:Fvgq9kS/6ociJEDnK0Fk1cpYF4FIW6ZF7LAe+6jwd28=

main.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"os"
+
+	"github.com/anthropics/anthropic-sdk-go"
+)
+
+func main() {
+	client := anthropic.NewClient()
+
+	scanner := bufio.NewScanner(os.Stdin)
+	getUserMessage := func() (string, bool) {
+		if !scanner.Scan() {
+			return "", false
+		}
+		return scanner.Text(), true
+	}
+
+	agent := NewAgent(&client, getUserMessage)
+	err := agent.Run(context.TODO())
+	if err != nil {
+		fmt.Printf("Error: %s\n", err.Error())
+	}
+}
+
+func NewAgent(client *anthropic.Client, getUserMessage func() (string, bool)) *Agent {
+	return &Agent{
+		client:         client,
+		getUserMessage: getUserMessage,
+	}
+}
+
+type Agent struct {
+	client         *anthropic.Client
+	getUserMessage func() (string, bool)
+}
+
+func (a *Agent) Run(ctx context.Context) error {
+	conversation := []anthropic.MessageParam{}
+
+	fmt.Println("Chat with Claude (use 'ctrl-c' to quit)")
+
+	for {
+		fmt.Print("\u001b[94mYou\u001b[0m: ")
+		userInput, ok := a.getUserMessage()
+		if !ok {
+			break
+		}
+
+		userMessage := anthropic.NewUserMessage(anthropic.NewTextBlock(userInput))
+		conversation = append(conversation, userMessage)
+
+		message, err := a.runInference(ctx, conversation)
+		if err != nil {
+			return err
+		}
+		conversation = append(conversation, message.ToParam())
+
+		for _, content := range message.Content {
+			switch content.Type {
+			case "text":
+				fmt.Printf("\u001b[93mClaude\u001b[0m: %s\n", content.Text)
+			}
+		}
+	}
+
+	return nil
+}
+
+func (a *Agent) runInference(ctx context.Context, conversation []anthropic.MessageParam) (*anthropic.Message, error) {
+	message, err := a.client.Messages.New(ctx, anthropic.MessageNewParams{
+		Model:     anthropic.ModelClaude3_7SonnetLatest,
+		MaxTokens: int64(1024),
+		Messages:  conversation,
+	})
+	return message, err
+}