Fix Go cookbook recipes to use correct SDK API

All 5 Go recipes and their markdown docs used incorrect API patterns
that don't match the real github.com/github/copilot-sdk/go v0.1.23:

- copilot.NewClient() -> copilot.NewClient(nil) (*ClientOptions param)
- client.Start() -> client.Start(ctx) (context.Context required)
- copilot.SessionConfig -> &copilot.SessionConfig (pointer required)
- session.On(func(event copilot.Event)) -> session.On(func(event copilot.SessionEvent))
- Type assertions -> event.Type string check + *event.Data.Content deref
- session.WaitForIdle() -> session.SendAndWait(ctx, ...) (WaitForIdle doesn't exist)
- copilot.SystemMessage -> copilot.SystemMessageConfig

All 5 recipes verified to compile against SDK v0.1.23.

cookbook/copilot-sdk/go/recipe/error-handling.go

@@ -1,25 +1,23 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	"log"
 
-	"github.com/github/copilot-sdk/go"
+	copilot "github.com/github/copilot-sdk/go"
 )
 
 func main() {
-	client := copilot.NewClient()
+	ctx := context.Background()
+	client := copilot.NewClient(nil)
 
-	if err := client.Start(); err != nil {
+	if err := client.Start(ctx); err != nil {
 		log.Fatalf("Failed to start client: %v", err)
 	}
-	defer func() {
-		if err := client.Stop(); err != nil {
-			log.Printf("Error stopping client: %v", err)
-		}
-	}()
+	defer client.Stop()
 
-	session, err := client.CreateSession(copilot.SessionConfig{
+	session, err := client.CreateSession(ctx, &copilot.SessionConfig{
 		Model: "gpt-5",
 	})
 	if err != nil {
@@ -27,18 +25,13 @@ func main() {
 	}
 	defer session.Destroy()
 
-	responseChan := make(chan string, 1)
-	session.On(func(event copilot.Event) {
-		if msg, ok := event.(copilot.AssistantMessageEvent); ok {
-			responseChan <- msg.Data.Content
-		}
-	})
-
-	if err := session.Send(copilot.MessageOptions{Prompt: "Hello!"}); err != nil {
+	result, err := session.SendAndWait(ctx, copilot.MessageOptions{Prompt: "Hello!"})
+	if err != nil {
 		log.Printf("Failed to send message: %v", err)
 		return
 	}
 
-	response := <-responseChan
-	fmt.Println(response)
+	if result != nil && result.Data.Content != nil {
+		fmt.Println(*result.Data.Content)
+	}
 }

cookbook/copilot-sdk/go/recipe/managing-local-files.go

@@ -1,24 +1,27 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	"log"
 	"os"
 	"path/filepath"
 
-	"github.com/github/copilot-sdk/go"
+	copilot "github.com/github/copilot-sdk/go"
 )
 
 func main() {
+	ctx := context.Background()
+
 	// Create and start client
-	client := copilot.NewClient()
-	if err := client.Start(); err != nil {
+	client := copilot.NewClient(nil)
+	if err := client.Start(ctx); err != nil {
 		log.Fatal(err)
 	}
 	defer client.Stop()
 
 	// Create session
-	session, err := client.CreateSession(copilot.SessionConfig{
+	session, err := client.CreateSession(ctx, &copilot.SessionConfig{
 		Model: "gpt-5",
 	})
 	if err != nil {
@@ -27,14 +30,20 @@ func main() {
 	defer session.Destroy()
 
 	// Event handler
-	session.On(func(event copilot.Event) {
-		switch e := event.(type) {
-		case copilot.AssistantMessageEvent:
-			fmt.Printf("\nCopilot: %s\n", e.Data.Content)
-		case copilot.ToolExecutionStartEvent:
-			fmt.Printf("  → Running: %s\n", e.Data.ToolName)
-		case copilot.ToolExecutionCompleteEvent:
-			fmt.Printf("  ✓ Completed: %s\n", e.Data.ToolName)
+	session.On(func(event copilot.SessionEvent) {
+		switch event.Type {
+		case "assistant.message":
+			if event.Data.Content != nil {
+				fmt.Printf("\nCopilot: %s\n", *event.Data.Content)
+			}
+		case "tool.execution_start":
+			if event.Data.ToolName != nil {
+				fmt.Printf("  → Running: %s\n", *event.Data.ToolName)
+			}
+		case "tool.execution_complete":
+			if event.Data.ToolName != nil {
+				fmt.Printf("  ✓ Completed: %s\n", *event.Data.ToolName)
+			}
 		}
 	})
 
@@ -54,9 +63,8 @@ Analyze the files in "%s" and organize them into subfolders.
 Please confirm before moving any files.
 `, targetFolder)
 
-	if err := session.Send(copilot.MessageOptions{Prompt: prompt}); err != nil {
+	_, err = session.SendAndWait(ctx, copilot.MessageOptions{Prompt: prompt})
+	if err != nil {
 		log.Fatal(err)
 	}
-
-	session.WaitForIdle()
 }

cookbook/copilot-sdk/go/recipe/multiple-sessions.go

@@ -1,34 +1,36 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	"log"
 
-	"github.com/github/copilot-sdk/go"
+	copilot "github.com/github/copilot-sdk/go"
 )
 
 func main() {
-	client := copilot.NewClient()
+	ctx := context.Background()
+	client := copilot.NewClient(nil)
 
-	if err := client.Start(); err != nil {
+	if err := client.Start(ctx); err != nil {
 		log.Fatal(err)
 	}
 	defer client.Stop()
 
 	// Create multiple independent sessions
-	session1, err := client.CreateSession(copilot.SessionConfig{Model: "gpt-5"})
+	session1, err := client.CreateSession(ctx, &copilot.SessionConfig{Model: "gpt-5"})
 	if err != nil {
 		log.Fatal(err)
 	}
 	defer session1.Destroy()
 
-	session2, err := client.CreateSession(copilot.SessionConfig{Model: "gpt-5"})
+	session2, err := client.CreateSession(ctx, &copilot.SessionConfig{Model: "gpt-5"})
 	if err != nil {
 		log.Fatal(err)
 	}
 	defer session2.Destroy()
 
-	session3, err := client.CreateSession(copilot.SessionConfig{Model: "claude-sonnet-4.5"})
+	session3, err := client.CreateSession(ctx, &copilot.SessionConfig{Model: "claude-sonnet-4.5"})
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -37,16 +39,16 @@ func main() {
 	fmt.Println("Created 3 independent sessions")
 
 	// Each session maintains its own conversation history
-	session1.Send(copilot.MessageOptions{Prompt: "You are helping with a Python project"})
-	session2.Send(copilot.MessageOptions{Prompt: "You are helping with a TypeScript project"})
-	session3.Send(copilot.MessageOptions{Prompt: "You are helping with a Go project"})
+	session1.Send(ctx, copilot.MessageOptions{Prompt: "You are helping with a Python project"})
+	session2.Send(ctx, copilot.MessageOptions{Prompt: "You are helping with a TypeScript project"})
+	session3.Send(ctx, copilot.MessageOptions{Prompt: "You are helping with a Go project"})
 
 	fmt.Println("Sent initial context to all sessions")
 
 	// Follow-up messages stay in their respective contexts
-	session1.Send(copilot.MessageOptions{Prompt: "How do I create a virtual environment?"})
-	session2.Send(copilot.MessageOptions{Prompt: "How do I set up tsconfig?"})
-	session3.Send(copilot.MessageOptions{Prompt: "How do I initialize a module?"})
+	session1.Send(ctx, copilot.MessageOptions{Prompt: "How do I create a virtual environment?"})
+	session2.Send(ctx, copilot.MessageOptions{Prompt: "How do I set up tsconfig?"})
+	session3.Send(ctx, copilot.MessageOptions{Prompt: "How do I initialize a module?"})
 
 	fmt.Println("Sent follow-up questions to each session")
 	fmt.Println("All sessions will be destroyed on exit")

cookbook/copilot-sdk/go/recipe/persisting-sessions.go

@@ -1,68 +1,68 @@
 package main
 
 import (
-    "fmt"
-    "log"
+	"context"
+	"fmt"
+	"log"
 
-    "github.com/github/copilot-sdk/go"
+	copilot "github.com/github/copilot-sdk/go"
 )
 
 func main() {
-    client := copilot.NewClient()
-    if err := client.Start(); err != nil {
-        log.Fatal(err)
-    }
-    defer client.Stop()
+	ctx := context.Background()
+	client := copilot.NewClient(nil)
+	if err := client.Start(ctx); err != nil {
+		log.Fatal(err)
+	}
+	defer client.Stop()
 
-    // Create session with a memorable ID
-    session, err := client.CreateSession(copilot.SessionConfig{
-        SessionID: "user-123-conversation",
-        Model:     "gpt-5",
-    })
-    if err != nil {
-        log.Fatal(err)
-    }
+	// Create session with a memorable ID
+	session, err := client.CreateSession(ctx, &copilot.SessionConfig{
+		SessionID: "user-123-conversation",
+		Model:     "gpt-5",
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
 
-    if err := session.Send(copilot.MessageOptions{Prompt: "Let's discuss TypeScript generics"}); err != nil {
-        log.Fatal(err)
-    }
-    fmt.Printf("Session created: %s\n", session.SessionID)
+	_, err = session.SendAndWait(ctx, copilot.MessageOptions{Prompt: "Let's discuss TypeScript generics"})
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("Session created: %s\n", session.SessionID)
 
-    // Destroy session but keep data on disk
-    if err := session.Destroy(); err != nil {
-        log.Fatal(err)
-    }
-    fmt.Println("Session destroyed (state persisted)")
+	// Destroy session but keep data on disk
+	session.Destroy()
+	fmt.Println("Session destroyed (state persisted)")
 
-    // Resume the previous session
-    resumed, err := client.ResumeSession("user-123-conversation")
-    if err != nil {
-        log.Fatal(err)
-    }
-    fmt.Printf("Resumed: %s\n", resumed.SessionID)
+	// Resume the previous session
+	resumed, err := client.ResumeSession(ctx, "user-123-conversation")
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("Resumed: %s\n", resumed.SessionID)
 
-    if err := resumed.Send(copilot.MessageOptions{Prompt: "What were we discussing?"}); err != nil {
-        log.Fatal(err)
-    }
+	_, err = resumed.SendAndWait(ctx, copilot.MessageOptions{Prompt: "What were we discussing?"})
+	if err != nil {
+		log.Fatal(err)
+	}
 
-    // List sessions
-    sessions, err := client.ListSessions()
-    if err != nil {
-        log.Fatal(err)
-    }
-    ids := make([]string, 0, len(sessions))
-    for _, s := range sessions {
-        ids = append(ids, s.SessionID)
-    }
-    fmt.Printf("Sessions: %v\n", ids)
+	// List sessions
+	sessions, err := client.ListSessions(ctx)
+	if err != nil {
+		log.Fatal(err)
+	}
+	ids := make([]string, 0, len(sessions))
+	for _, s := range sessions {
+		ids = append(ids, s.SessionID)
+	}
+	fmt.Printf("Sessions: %v\n", ids)
 
-    // Delete session permanently
-    if err := client.DeleteSession("user-123-conversation"); err != nil {
-        log.Fatal(err)
-    }
-    fmt.Println("Session deleted")
+	// Delete session permanently
+	if err := client.DeleteSession(ctx, "user-123-conversation"); err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println("Session deleted")
 
-    if err := resumed.Destroy(); err != nil {
-        log.Fatal(err)
-    }
+	resumed.Destroy()
 }

cookbook/copilot-sdk/go/recipe/pr-visualization.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"bufio"
+	"context"
 	"flag"
 	"fmt"
 	"log"
@@ -10,7 +11,7 @@ import (
 	"regexp"
 	"strings"
 
-	"github.com/github/copilot-sdk/go"
+	copilot "github.com/github/copilot-sdk/go"
 )
 
 // ============================================================================
@@ -58,6 +59,7 @@ func promptForRepo() string {
 // ============================================================================
 
 func main() {
+	ctx := context.Background()
 	repoFlag := flag.String("repo", "", "GitHub repository (owner/repo)")
 	flag.Parse()
 
@@ -90,18 +92,18 @@ func main() {
 	parts := strings.SplitN(repo, "/", 2)
 	owner, repoName := parts[0], parts[1]
 
-	// Create Copilot client - no custom tools needed!
-	client := copilot.NewClient(copilot.ClientConfig{LogLevel: "error"})
+	// Create Copilot client
+	client := copilot.NewClient(nil)
 
-	if err := client.Start(); err != nil {
+	if err := client.Start(ctx); err != nil {
 		log.Fatal(err)
 	}
 	defer client.Stop()
 
 	cwd, _ := os.Getwd()
-	session, err := client.CreateSession(copilot.SessionConfig{
+	session, err := client.CreateSession(ctx, &copilot.SessionConfig{
 		Model: "gpt-5",
-		SystemMessage: copilot.SystemMessage{
+		SystemMessage: &copilot.SystemMessageConfig{
 			Content: fmt.Sprintf(`
 <context>
 You are analyzing pull requests for the GitHub repository: %s/%s
@@ -123,12 +125,16 @@ The current working directory is: %s
 	defer session.Destroy()
 
 	// Set up event handling
-	session.On(func(event copilot.Event) {
-		switch e := event.(type) {
-		case copilot.AssistantMessageEvent:
-			fmt.Printf("\n🤖 %s\n\n", e.Data.Content)
-		case copilot.ToolExecutionStartEvent:
-			fmt.Printf("  ⚙️  %s\n", e.Data.ToolName)
+	session.On(func(event copilot.SessionEvent) {
+		switch event.Type {
+		case "assistant.message":
+			if event.Data.Content != nil {
+				fmt.Printf("\n🤖 %s\n\n", *event.Data.Content)
+			}
+		case "tool.execution_start":
+			if event.Data.ToolName != nil {
+				fmt.Printf("  ⚙️  %s\n", *event.Data.ToolName)
+			}
 		}
 	})
 
@@ -144,12 +150,10 @@ The current working directory is: %s
       Finally, summarize the PR health - average age, oldest PR, and how many might be considered stale.
     `, owner, repoName)
 
-	if err := session.Send(copilot.MessageOptions{Prompt: prompt}); err != nil {
+	if _, err := session.SendAndWait(ctx, copilot.MessageOptions{Prompt: prompt}); err != nil {
 		log.Fatal(err)
 	}
 
-	session.WaitForIdle()
-
 	// Interactive loop
 	fmt.Println("\n💡 Ask follow-up questions or type \"exit\" to quit.\n")
 	fmt.Println("Examples:")
@@ -173,10 +177,8 @@ The current working directory is: %s
 			break
 		}
 
-		if err := session.Send(copilot.MessageOptions{Prompt: input}); err != nil {
+		if _, err := session.SendAndWait(ctx, copilot.MessageOptions{Prompt: input}); err != nil {
 			log.Printf("Error: %v", err)
 		}
-
-		session.WaitForIdle()
 	}
 }