feat(agent-zero): Zulip adapter with A2A protocol for kagentz

New project: agent-zero-zulip/ — direct Zulip integration for Agent Zero
agents using A2A protocol internally.

Architecture:
  kagentz (CT 105) ┌──────────────────────┐
                    │ Zulip Adapter  ◄──►  │ Agent Zero
                    │ polls Zulip    A2A   │ Docker container
                    │ port 8001            │
                    └──────────────────────┘

- adapter.py: Zulip event queue poller + A2A client
- No intermediate bridge — direct kagentz ↔ Zulip
- Heartbeat, reconnection, placeholder→edit streaming
- Designed for re-use: scottdenya, future Agent Zero agents

agent-zero-zulip/DEPLOY.md

@@ -0,0 +1,48 @@
+# Deploy Agent Zero Zulip Adapter
+
+## Prerequisites
+- Agent Zero running in Docker on the target CT
+- A Zulip bot created for the agent (kagentz-bot, scottdenya-bot, etc.)
+- Python 3.11+ with httpx
+
+## Steps
+
+### 1. Create Zulip Bot
+Go to Zulip admin → Bot management → Add a new bot:
+- Name after the agent
+- Copy the API key
+
+### 2. Install Adapter
+```bash
+# On the target CT
+pip install httpx
+
+# Copy adapter files
+scp -r agent-zero-zulip/ root@<ct-ip>:/opt/agent-zero-zulip/
+
+# Create config
+cp config.yaml.example config.yaml
+# Edit config.yaml with Zulip credentials
+```
+
+### 3. Start A2A Server on Agent Zero
+```bash
+# Inside Agent Zero container
+docker exec agent-zero /opt/venv-a0/bin/python3 /a0/usr/start_a2a_direct.py &
+
+# Verify A2A is running
+curl http://localhost:8001/.well-known/agent.json
+```
+
+### 4. Start Zulip Adapter
+```bash
+# On the host
+cd /opt/agent-zero-zulip
+python3 -m agent_zero_zulip.adapter &
+
+# Verify
+tail -f adapter.log
+```
+
+### 5. Test
+Send a DM to kagentz-bot in Zulip. Expect "Processing..." → response.

agent-zero-zulip/README.md

@@ -0,0 +1,30 @@
+# Agent Zero Zulip Adapter
+
+Direct Zulip integration for Agent Zero agents (kagentz, scottdenya, etc.).
+Each agent gets its own Zulip bot. Uses A2A protocol internally to
+communicate with Agent Zero's native A2A server.
+
+## Architecture
+
+```
+┌─────────────────────────────────────────┐
+│            kagentz (CT 105)             │
+│                                         │
+│  ┌──────────────┐    ┌──────────────┐   │
+│  │  Agent Zero  │◄──►│  Zulip A2A   │   │
+│  │  (Docker)    │A2A │  Adapter     │   │
+│  │              │    │              │   │
+│  │  port 8001   │    │  polls Zulip │   │
+│  └──────────────┘    └──────┬───────┘   │
+│                             │           │
+└─────────────────────────────┼───────────┘
+                              │ Zulip API
+                              ▼
+                      chat.sysloggh.net
+```
+
+## Components
+
+- `adapter.py` — Zulip event queue poller + A2A client
+- `agent_card.py` — Agent Card for A2A discovery
+- `Dockerfile` or `requirements.txt` for dependencies

agent-zero-zulip/config.yaml.example

@@ -0,0 +1,13 @@
+# Agent Zero Zulip Adapter Configuration
+# Copy to config.yaml and fill in credentials
+
+zulip:
+  site: https://chat.sysloggh.net
+  email: kagentz-bot@chat.sysloggh.net
+  api_key: "<your-api-key>"
+  stream: agent-hub
+
+agent:
+  name: kagentz
+  a2a_url: http://localhost:8001/a2a
+  a2a_token: 8zNgdOEXzYxjQvTl

agent-zero-zulip/requirements.txt

@@ -0,0 +1 @@
+httpx>=0.27.0

agent-zero-zulip/src/agent_zero_zulip/adapter.py

@@ -0,0 +1,485 @@
+"""
+Agent Zero Zulip Adapter — Direct Zulip integration for Agent Zero agents.
+
+Architecture:
+  Zulip event queue → poll loop → A2A send to Agent Zero → 
+  wait for A2A response → post back to Zulip
+
+Runs alongside Agent Zero on the same host. Communicates with Agent Zero
+via local A2A protocol (port 8001). No intermediate bridge needed.
+"""
+
+import asyncio
+import json
+import logging
+import os
+import time
+from datetime import datetime, timezone
+from typing import Any, Optional
+import urllib.parse
+
+try:
+    import httpx
+except ImportError:
+    httpx = None
+
+logger = logging.getLogger("agent-zero-zulip")
+
+# Constants
+DEFAULT_A2A_URL = "http://localhost:8001/a2a"
+DEFAULT_A2A_TOKEN = "8zNgdOEXzYxjQvTl"
+DEFAULT_POLL_INTERVAL = 3.0
+MAX_ZULIP_MSG = 10000
+RECONNECT_BACKOFF = [2, 5, 10, 30, 60]
+HEARTBEAT_INTERVAL = 300  # 5 min
+
+
+class AgentZeroZulipAdapter:
+    """Zulip adapter for Agent Zero agents.
+    
+    Connects to Zulip via event queue, forwards DMs and @mentions
+    to Agent Zero via local A2A protocol, and posts responses back.
+    """
+
+    def __init__(self):
+        # Zulip config from env vars
+        self._site = (os.getenv("ZULIP_SITE") or "").rstrip("/")
+        self._email = os.getenv("ZULIP_EMAIL") or ""
+        self._api_key = os.getenv("ZULIP_API_KEY") or ""
+        self._agent_name = os.getenv("ZULIP_AGENT_NAME") or "kagentz"
+        self._stream = os.getenv("ZULIP_STREAM") or "agent-hub"
+        
+        # A2A config
+        self._a2a_url = os.getenv("A2A_URL") or DEFAULT_A2A_URL
+        self._a2a_token = os.getenv("A2A_TOKEN") or DEFAULT_A2A_TOKEN
+        
+        # State
+        self._auth_header = self._build_auth()
+        self._http_client: Optional[httpx.AsyncClient] = None
+        self._queue_id: Optional[str] = None
+        self._last_event_id: int = -1
+        self._bot_user_id: Optional[int] = None
+        self._bot_email: str = self._email
+        self._running = False
+        self._poll_task: Optional[asyncio.Task] = None
+        
+        # Stats
+        self._messages_processed = 0
+        self._poll_count = 0
+        self._reconnects = 0
+        self._last_heartbeat = 0.0
+        self._last_event_time = time.time()
+        self._a2a_sessions: dict = {}  # chat_id -> A2A context_id
+    
+    def _build_auth(self) -> str:
+        import base64
+        token = base64.b64encode(f"{self._email}:{self._api_key}".encode()).decode()
+        return f"Basic {token}"
+    
+    async def start(self):
+        """Start the adapter — connect to Zulip and begin polling."""
+        if not all([self._site, self._email, self._api_key]):
+            logger.error("Missing Zulip credentials. Set ZULIP_SITE, ZULIP_EMAIL, ZULIP_API_KEY")
+            return False
+        
+        if not httpx:
+            logger.error("httpx not installed")
+            return False
+        
+        self._running = True
+        self._http_client = httpx.AsyncClient(timeout=30.0)
+        
+        # Connect to Zulip
+        if not await self._connect():
+            return False
+        
+        logger.info(f"Adapter started for {self._agent_name} ({self._email})")
+        return True
+    
+    async def stop(self):
+        """Stop the adapter."""
+        self._running = False
+        if self._poll_task:
+            self._poll_task.cancel()
+            try:
+                await self._poll_task
+            except asyncio.CancelledError:
+                pass
+        if self._http_client:
+            await self._http_client.aclose()
+    
+    async def _connect(self) -> bool:
+        """Register Zulip event queue."""
+        try:
+            resp = await self._api_call("POST", "/api/v1/register", data={
+                "event_types": '["message"]',
+                "apply_markdown": "true",
+            })
+            if not resp:
+                logger.error("Queue registration failed")
+                return False
+            
+            self._queue_id = resp.get("queue_id")
+            self._last_event_id = resp.get("last_event_id", -1)
+            self._bot_user_id = resp.get("user_id")
+            
+            # Resolve bot user_id if not provided by register
+            if self._bot_user_id is None:
+                me = await self._api_call("GET", "/api/v1/users/me")
+                if me:
+                    self._bot_user_id = me.get("user_id")
+            
+            logger.info(
+                f"Connected to Zulip as {self._email} "
+                f"(queue={self._queue_id}, bot_id={self._bot_user_id})"
+            )
+            
+            # Start poll loop
+            self._poll_task = asyncio.create_task(self._poll_forever())
+            return True
+            
+        except Exception as e:
+            logger.error(f"Connection failed: {e}")
+            return False
+    
+    async def _poll_forever(self):
+        """Main poll loop."""
+        backoff = 0
+        while self._running:
+            if not self._queue_id:
+                await asyncio.sleep(1)
+                continue
+            
+            try:
+                events = await self._fetch_events()
+                self._poll_count += 1
+                
+                for event in events:
+                    try:
+                        await self._process_event(event)
+                    except Exception as e:
+                        logger.warning(f"Event processing error: {e}")
+                
+                backoff = 0
+                
+                # Heartbeat
+                now = time.time()
+                if now - self._last_heartbeat > HEARTBEAT_INTERVAL:
+                    self._last_heartbeat = now
+                    silence = now - self._last_event_time
+                    logger.info(
+                        f"Heartbeat — polls={self._poll_count} "
+                        f"processed={self._messages_processed} "
+                        f"silence={silence:.0f}s reconnects={self._reconnects}"
+                    )
+                    
+            except asyncio.CancelledError:
+                break
+            except Exception as e:
+                err = str(e)
+                if "BAD_EVENT_QUEUE_ID" in err:
+                    logger.info("Queue expired, reconnecting...")
+                    await self._reconnect()
+                    continue
+                delay = RECONNECT_BACKOFF[min(backoff, len(RECONNECT_BACKOFF) - 1)]
+                backoff += 1
+                logger.warning(f"Poll error: {e}")
+                await asyncio.sleep(delay)
+            
+            await asyncio.sleep(DEFAULT_POLL_INTERVAL)
+    
+    async def _fetch_events(self) -> list:
+        """Fetch events from Zulip queue."""
+        resp = await self._api_call("GET", "/api/v1/events", params={
+            "queue_id": self._queue_id,
+            "last_event_id": str(self._last_event_id),
+            "dont_block": "true",
+        })
+        if resp is None:
+            return []
+        
+        events = resp.get("events", [])
+        for event in events:
+            eid = event.get("id", 0)
+            if eid > self._last_event_id:
+                self._last_event_id = eid
+        
+        return [e for e in events if e.get("type") == "message"]
+    
+    async def _reconnect(self):
+        """Re-register event queue."""
+        self._queue_id = None
+        try:
+            resp = await self._api_call("POST", "/api/v1/register", data={
+                "event_types": '["message"]',
+                "apply_markdown": "true",
+            })
+            if resp:
+                self._queue_id = resp.get("queue_id")
+                self._last_event_id = resp.get("last_event_id", -1)
+                self._reconnects += 1
+                logger.info(f"Reconnected, queue={self._queue_id}")
+        except Exception as e:
+            logger.error(f"Reconnect failed: {e}")
+    
+    async def _process_event(self, event: dict):
+        """Process a Zulip message event."""
+        msg = event.get("message", {})
+        msg_type = msg.get("type", "")
+        sender_email = msg.get("sender_email", "")
+        sender_name = msg.get("sender_full_name", "Unknown")
+        sender_id = msg.get("sender_id")
+        content = msg.get("content", "")
+        
+        # Ignore own messages
+        if sender_email == self._bot_email:
+            return
+        
+        # Determine targeting
+        mentioned_users = msg.get("mentioned_users", []) or []
+        mentioned_ids = [u.get("user_id") for u in mentioned_users if isinstance(u, dict)]
+        is_dm = msg_type == "private"
+        is_mention = self._bot_user_id and self._bot_user_id in mentioned_ids
+        
+        if is_dm:
+            self._messages_processed += 1
+            self._last_event_time = time.time()
+            logger.info(f"DM from {sender_name}: {content[:80]}...")
+            
+            # Send typing indicator
+            await self._typing(sender_id, "start")
+            
+            # Send placeholder
+            placeholder_id = await self._send_msg("private", str(sender_id), 
+                ":robot: _Processing your message..._")
+            
+            # Forward to Agent Zero via A2A
+            response = await self._a2a_chat(sender_name, content)
+            
+            # Stop typing
+            await self._typing(sender_id, "stop")
+            
+            # Post response
+            if response and placeholder_id:
+                await self._edit_msg(placeholder_id, response[:MAX_ZULIP_MSG])
+                logger.info(f"Responded to {sender_name} ({len(response)} chars)")
+            elif response:
+                await self._send_msg("private", str(sender_id), response[:MAX_ZULIP_MSG])
+    
+    async def _a2a_chat(self, sender_name: str, message: str) -> Optional[str]:
+        """Send message to Agent Zero via local A2A protocol."""
+        try:
+            a2a_payload = {
+                "jsonrpc": "2.0",
+                "method": "tasks/send",
+                "params": {
+                    "id": f"zulip-{int(time.time())}",
+                    "message": {
+                        "role": "user",
+                        "parts": [{"text": f"[Zulip DM from {sender_name}]: {message}"}]
+                    }
+                },
+                "id": 1
+            }
+            
+            headers = {
+                "Content-Type": "application/json",
+                "Authorization": f"Bearer {self._a2a_token}",
+            }
+            
+            async with httpx.AsyncClient(timeout=120.0) as client:
+                # Send the message to Agent Zero
+                resp = await client.post(
+                    self._a2a_url,
+                    json=a2a_payload,
+                    headers=headers,
+                )
+                
+                if resp.status_code != 200:
+                    logger.error(f"A2A send failed: HTTP {resp.status_code}")
+                    return f":warning: Failed to reach agent. Error: HTTP {resp.status_code}"
+                
+                result = resp.json()
+                task_id = result.get("result", {}).get("id")
+                
+                if not task_id:
+                    logger.error("A2A: no task_id returned")
+                    return ":warning: Agent did not create a task."
+                
+                # Poll for completion
+                for _ in range(60):  # max 60s wait
+                    await asyncio.sleep(1)
+                    status_resp = await client.post(
+                        self._a2a_url,
+                        json={
+                            "jsonrpc": "2.0",
+                            "method": "tasks/get",
+                            "params": {"id": task_id},
+                            "id": 2
+                        },
+                        headers=headers,
+                    )
+                    
+                    if status_resp.status_code != 200:
+                        continue
+                    
+                    status_data = status_resp.json()
+                    result_data = status_data.get("result", {})
+                    state = result_data.get("status", {}).get("state", "")
+                    
+                    if state == "completed":
+                        # Extract response text
+                        return self._extract_a2a_response(result_data)
+                    elif state in ("failed", "error"):
+                        error_msg = result_data.get("status", {}).get("message", {}).get("text", "Unknown error")
+                        return f":warning: Agent processing failed: {error_msg}"
+                
+                return ":hourglass: Agent did not complete in time."
+                
+        except httpx.TimeoutException:
+            return ":hourglass: Agent request timed out."
+        except Exception as e:
+            logger.error(f"A2A error: {e}")
+            return f":warning: Communication error: {type(e).__name__}"
+    
+    def _extract_a2a_response(self, result: dict) -> str:
+        """Extract assistant text from A2A response."""
+        history = result.get("history", [])
+        for msg in reversed(history):
+            if isinstance(msg, dict) and msg.get("role") == "assistant":
+                parts = msg.get("parts", [])
+                texts = [p.get("text", "") for p in parts if isinstance(p, dict)]
+                text = "\n".join(t for t in texts if t)
+                if text:
+                    return text
+        
+        artifacts = result.get("artifacts", [])
+        for artifact in reversed(artifacts):
+            if isinstance(artifact, dict):
+                text = artifact.get("text") or artifact.get("content") or ""
+                if text:
+                    return text
+        
+        return "(no response)"
+    
+    # ── Zulip API ──
+    
+    async def _api_call(self, method: str, path: str, 
+                        data: dict = None, params: dict = None) -> Optional[dict]:
+        """Make Zulip API call."""
+        if not self._http_client:
+            return None
+        
+        url = f"{self._site}{path}"
+        headers = {"Authorization": self._auth_header}
+        
+        try:
+            if method == "GET":
+                resp = await self._http_client.get(url, params=params, headers=headers)
+            elif method == "POST":
+                resp = await self._http_client.post(url, data=data, headers=headers)
+            elif method == "PATCH":
+                resp = await self._http_client.patch(url, data=data, headers=headers)
+            else:
+                return None
+            
+            if resp.status_code >= 400:
+                logger.debug(f"API {method} {path}: {resp.status_code}")
+                return None
+            
+            return resp.json()
+        except Exception as e:
+            logger.debug(f"API error {method} {path}: {e}")
+            return None
+    
+    async def _send_msg(self, msg_type: str, to: str, content: str) -> Optional[int]:
+        """Send a message to Zulip."""
+        payload = {"type": msg_type, "content": content}
+        if msg_type == "private":
+            payload["to"] = json.dumps([int(to)])
+        else:
+            payload["to"] = to
+            payload["subject"] = "general"
+        
+        resp = await self._api_call("POST", "/api/v1/messages", data=payload)
+        if resp and resp.get("id"):
+            return resp["id"]
+        return None
+    
+    async def _edit_msg(self, message_id: int, content: str):
+        """Edit a Zulip message."""
+        await self._api_call("PATCH", f"/api/v1/messages/{message_id}",
+                             data={"content": content})
+    
+    async def _typing(self, user_id: int, op: str):
+        """Send typing indicator."""
+        if not user_id:
+            return
+        to_data = json.dumps([user_id])
+        await self._api_call("POST", "/api/v1/typing",
+                             data={"to": to_data, "op": op})
+    
+    def run(self):
+        """Synchronous entry point."""
+        asyncio.run(self._run_async())
+    
+    async def _run_async(self):
+        try:
+            if await self.start():
+                # Keep running until stopped
+                while self._running:
+                    await asyncio.sleep(1)
+        except asyncio.CancelledError:
+            pass
+        finally:
+            await self.stop()
+
+
+# ── Entry point ──
+
+def main():
+    """CLI entry point."""
+    logging.basicConfig(
+        level=logging.INFO,
+        format="%(asctime)s [%(name)s] %(levelname)s: %(message)s",
+        datefmt="%Y-%m-%d %H:%M:%S",
+    )
+    
+    adapter = AgentZeroZulipAdapter()
+    
+    try:
+        adapter.run()
+    except KeyboardInterrupt:
+        logger.info("Shutdown requested")
+    
+    # Handle signals
+    import signal
+    shutdown = asyncio.Event()
+    
+    def _handle_signal():
+        shutdown.set()
+    
+    loop = asyncio.new_event_loop()
+    asyncio.set_event_loop(loop)
+    
+    try:
+        loop.add_signal_handler(signal.SIGTERM, _handle_signal)
+        loop.add_signal_handler(signal.SIGINT, _handle_signal)
+    except NotImplementedError:
+        pass
+    
+    async def _run():
+        if await adapter.start():
+            await shutdown.wait()
+        await adapter.stop()
+    
+    try:
+        loop.run_until_complete(_run())
+    except KeyboardInterrupt:
+        pass
+    finally:
+        loop.close()
+
+
+if __name__ == "__main__":
+    main()