.promptHandler((req, context) -> {

    // 1. Thought — show thinking process (convenience method)
    context.sendThought("Let me analyze this request...");

    // 2. Plan — show steps and progress (full API)
    // Short constructors drop the discriminator as of 0.80.0: it could only
    // ever be the variant's own name, so writing it was noise.
    context.sendSessionUpdate(
        new Plan(List.of(
            new PlanEntry("Analyze the prompt",
                PlanEntryPriority.HIGH, PlanEntryStatus.IN_PROGRESS),
            new PlanEntry("Generate response",
                PlanEntryPriority.HIGH, PlanEntryStatus.PENDING),
            new PlanEntry("Format output",
                PlanEntryPriority.MEDIUM, PlanEntryStatus.PENDING)
        )));

    // 3. Tool Call — show tool execution starting
    context.sendSessionUpdate(
        new ToolCall("tool_call",
            "tool-1",
            "Analyzing prompt",   // title: what the user sees
            "analyze_prompt",     // name: the tool's own identifier (may be null)
            ToolKind.THINK,
            ToolCallStatus.IN_PROGRESS,
            List.of(), null, null, null, null));

    // 4. Tool Call Update — show progress
    context.sendSessionUpdate(
        new ToolCallUpdateNotification("tool_call_update",
            "tool-1", "Analyzing prompt", "analyze_prompt", ToolKind.THINK,
            ToolCallStatus.COMPLETED,
            List.of(), null, null, null, null));

    // 5. Available Commands — advertise slash commands
    context.sendSessionUpdate(
        new AvailableCommandsUpdate(List.of(
            new AvailableCommand("help", "Show help",
                new AvailableCommandInput("topic")),
            new AvailableCommand("clear", "Clear context", null)
        )));

    // 6. Mode Update — report current mode
    context.sendSessionUpdate(
        new CurrentModeUpdate("default"));

    // 7. Usage Update — report token usage and cost
    context.sendSessionUpdate(
        new UsageUpdate(53000L, 200000L));

    // 8. Message chunks — the actual response (convenience method)
    context.sendMessage("Here is my response ");
    context.sendMessage("streamed in ");
    context.sendMessage("multiple chunks.");

    return PromptResponse.endTurn();
})

./mvnw package -pl module-14-sending-updates -q
./mvnw exec:java -pl module-14-sending-updates