Minimal Sender

package main

import (
	"encoding/json"
	"fmt"
	"os"
	"time"
)

type Envelope struct {
	Protocol    string         `json:"protocol"`
	ID          string         `json:"id"`
	WorkspaceID string         `json:"workspace_id"`
	Kind        string         `json:"kind"`
	Channel     string         `json:"channel"`
	Surface     string         `json:"surface"`
	ThreadID    string         `json:"thread_id"`
	From        string         `json:"from"`
	To          *string        `json:"to"`
	TS          int64          `json:"ts"`
	Body        map[string]any `json:"body"`
	Proof       map[string]any `json:"proof"`
}

func main() {
	now := time.Now().UTC().Unix()
	envelope := Envelope{
		Protocol:    "compozy-network/v0",
		ID:          fmt.Sprintf("msg_demo_%d", now),
		WorkspaceID: "ws_alpha",
		Kind:        "say",
		Channel:     "builders",
		Surface:     "thread",
		ThreadID:    "thread_minimal_demo",
		From:        "sender.demo",
		TS:          now,
		Body:        map[string]any{"text": "Hello from a minimal sender."},
	}
	payload, err := json.MarshalIndent(envelope, "", "  ")
	if err != nil {
		fmt.Fprintf(os.Stderr, "encode envelope: %v\n", err)
		os.Exit(1)
	}
	if _, err := os.Stdout.Write(append(payload, '\n')); err != nil {
		fmt.Fprintf(os.Stderr, "write envelope: %v\n", err)
		os.Exit(1)
	}
}

go run ./minimal-sender.go