chore: snapshot main sync
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302
docs/how-to-build-a-coding-agent/read.go
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302
docs/how-to-build-a-coding-agent/read.go
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package main
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import (
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"bufio"
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"context"
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"encoding/json"
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"flag"
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"fmt"
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"log"
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"os"
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"github.com/anthropics/anthropic-sdk-go"
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"github.com/invopop/jsonschema"
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)
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func main() {
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verbose := flag.Bool("verbose", false, "enable verbose logging")
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flag.Parse()
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if *verbose {
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log.SetOutput(os.Stderr)
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log.SetFlags(log.LstdFlags | log.Lshortfile)
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log.Println("Verbose logging enabled")
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} else {
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log.SetOutput(os.Stdout)
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log.SetFlags(0)
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log.SetPrefix("")
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}
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client := anthropic.NewClient()
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if *verbose {
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log.Println("Anthropic client initialized")
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}
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scanner := bufio.NewScanner(os.Stdin)
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getUserMessage := func() (string, bool) {
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if !scanner.Scan() {
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return "", false
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}
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return scanner.Text(), true
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}
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tools := []ToolDefinition{ReadFileDefinition}
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if *verbose {
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log.Printf("Initialized %d tools", len(tools))
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}
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agent := NewAgent(&client, getUserMessage, tools, *verbose)
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err := agent.Run(context.TODO())
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if err != nil {
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fmt.Printf("Error: %s\n", err.Error())
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}
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}
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func NewAgent(
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client *anthropic.Client,
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getUserMessage func() (string, bool),
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tools []ToolDefinition,
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verbose bool,
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) *Agent {
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return &Agent{
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client: client,
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getUserMessage: getUserMessage,
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tools: tools,
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verbose: verbose,
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}
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}
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type Agent struct {
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client *anthropic.Client
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getUserMessage func() (string, bool)
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tools []ToolDefinition
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verbose bool
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}
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func (a *Agent) Run(ctx context.Context) error {
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conversation := []anthropic.MessageParam{}
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if a.verbose {
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log.Println("Starting chat session with tools enabled")
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}
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fmt.Println("Chat with Claude (use 'ctrl-c' to quit)")
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for {
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fmt.Print("\u001b[94mYou\u001b[0m: ")
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userInput, ok := a.getUserMessage()
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if !ok {
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if a.verbose {
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log.Println("User input ended, breaking from chat loop")
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}
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break
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}
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// Skip empty messages
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if userInput == "" {
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if a.verbose {
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log.Println("Skipping empty message")
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}
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continue
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}
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if a.verbose {
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log.Printf("User input received: %q", userInput)
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}
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userMessage := anthropic.NewUserMessage(anthropic.NewTextBlock(userInput))
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conversation = append(conversation, userMessage)
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if a.verbose {
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log.Printf("Sending message to Claude, conversation length: %d", len(conversation))
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}
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message, err := a.runInference(ctx, conversation)
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if err != nil {
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if a.verbose {
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log.Printf("Error during inference: %v", err)
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}
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return err
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}
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conversation = append(conversation, message.ToParam())
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// Keep processing until Claude stops using tools
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for {
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// Collect all tool uses and their results
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var toolResults []anthropic.ContentBlockParamUnion
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var hasToolUse bool
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if a.verbose {
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log.Printf("Processing %d content blocks from Claude", len(message.Content))
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}
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for _, content := range message.Content {
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switch content.Type {
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case "text":
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fmt.Printf("\u001b[93mClaude\u001b[0m: %s\n", content.Text)
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case "tool_use":
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hasToolUse = true
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toolUse := content.AsToolUse()
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if a.verbose {
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log.Printf("Tool use detected: %s with input: %s", toolUse.Name, string(toolUse.Input))
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}
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fmt.Printf("\u001b[96mtool\u001b[0m: %s(%s)\n", toolUse.Name, string(toolUse.Input))
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// Find and execute the tool
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var toolResult string
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var toolError error
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var toolFound bool
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for _, tool := range a.tools {
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if tool.Name == toolUse.Name {
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if a.verbose {
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log.Printf("Executing tool: %s", tool.Name)
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}
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toolResult, toolError = tool.Function(toolUse.Input)
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fmt.Printf("\u001b[92mresult\u001b[0m: %s\n", toolResult)
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if toolError != nil {
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fmt.Printf("\u001b[91merror\u001b[0m: %s\n", toolError.Error())
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}
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if a.verbose {
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if toolError != nil {
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log.Printf("Tool execution failed: %v", toolError)
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} else {
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log.Printf("Tool execution successful, result length: %d chars", len(toolResult))
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}
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}
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toolFound = true
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break
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}
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}
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if !toolFound {
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toolError = fmt.Errorf("tool '%s' not found", toolUse.Name)
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fmt.Printf("\u001b[91merror\u001b[0m: %s\n", toolError.Error())
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}
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// Add tool result to collection
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if toolError != nil {
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toolResults = append(toolResults, anthropic.NewToolResultBlock(toolUse.ID, toolError.Error(), true))
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} else {
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toolResults = append(toolResults, anthropic.NewToolResultBlock(toolUse.ID, toolResult, false))
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}
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}
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}
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// If there were no tool uses, we're done
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if !hasToolUse {
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break
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}
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// Send all tool results back and get Claude's response
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if a.verbose {
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log.Printf("Sending %d tool results back to Claude", len(toolResults))
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}
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toolResultMessage := anthropic.NewUserMessage(toolResults...)
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conversation = append(conversation, toolResultMessage)
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// Get Claude's response after tool execution
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message, err = a.runInference(ctx, conversation)
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if err != nil {
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if a.verbose {
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log.Printf("Error during followup inference: %v", err)
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}
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return err
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}
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conversation = append(conversation, message.ToParam())
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if a.verbose {
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log.Printf("Received followup response with %d content blocks", len(message.Content))
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}
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// Continue loop to process the new message
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}
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}
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if a.verbose {
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log.Println("Chat session ended")
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}
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return nil
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}
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func (a *Agent) runInference(ctx context.Context, conversation []anthropic.MessageParam) (*anthropic.Message, error) {
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anthropicTools := []anthropic.ToolUnionParam{}
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for _, tool := range a.tools {
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anthropicTools = append(anthropicTools, anthropic.ToolUnionParam{
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OfTool: &anthropic.ToolParam{
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Name: tool.Name,
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Description: anthropic.String(tool.Description),
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InputSchema: tool.InputSchema,
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},
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})
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}
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if a.verbose {
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log.Printf("Making API call to Claude with model: %s and %d tools", anthropic.ModelClaude3_7SonnetLatest, len(anthropicTools))
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}
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message, err := a.client.Messages.New(ctx, anthropic.MessageNewParams{
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Model: anthropic.ModelClaude3_7SonnetLatest,
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MaxTokens: int64(1024),
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Messages: conversation,
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Tools: anthropicTools,
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})
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if a.verbose {
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if err != nil {
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log.Printf("API call failed: %v", err)
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} else {
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log.Printf("API call successful, response received")
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}
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}
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return message, err
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}
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type ToolDefinition struct {
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Name string `json:"name"`
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Description string `json:"description"`
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InputSchema anthropic.ToolInputSchemaParam `json:"input_schema"`
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Function func(input json.RawMessage) (string, error)
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}
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var ReadFileDefinition = ToolDefinition{
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Name: "read_file",
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Description: "Read the contents of a given relative file path. Use this when you want to see what's inside a file. Do not use this with directory names.",
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InputSchema: ReadFileInputSchema,
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Function: ReadFile,
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}
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type ReadFileInput struct {
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Path string `json:"path" jsonschema_description:"The relative path of a file in the working directory."`
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}
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var ReadFileInputSchema = GenerateSchema[ReadFileInput]()
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func ReadFile(input json.RawMessage) (string, error) {
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readFileInput := ReadFileInput{}
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err := json.Unmarshal(input, &readFileInput)
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if err != nil {
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panic(err)
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}
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log.Printf("Reading file: %s", readFileInput.Path)
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content, err := os.ReadFile(readFileInput.Path)
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if err != nil {
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log.Printf("Failed to read file %s: %v", readFileInput.Path, err)
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return "", err
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}
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log.Printf("Successfully read file %s (%d bytes)", readFileInput.Path, len(content))
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return string(content), nil
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}
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func GenerateSchema[T any]() anthropic.ToolInputSchemaParam {
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reflector := jsonschema.Reflector{
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AllowAdditionalProperties: false,
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DoNotReference: true,
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}
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var v T
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schema := reflector.Reflect(v)
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return anthropic.ToolInputSchemaParam{
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Properties: schema.Properties,
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}
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}
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