feat: crisis notification hook with Telegram alerts (#705)

Crisis hook detects crisis events in conversations and notifies humans.

New gateway/builtin_hooks/crisis_notify.py:
- detect_crisis(): scans text for crisis indicators (suicide, self-harm)
  returns (is_crisis, severity, matched_patterns)
- 14 crisis patterns across HIGH/MEDIUM/LOW severity
- log_crisis_event(): writes to ~/.hermes/crisis-events.log (JSON lines)
- send_telegram_crisis_alert(): sends notification via Telegram
  (ALERT_TELEGRAM_TOKEN + ALERT_TELEGRAM_CHAT_ID or CRISIS_ALERT_CHAT_ID)
- handle(): agent:end hook handler, scans user messages and agent responses

Integration:
- Registered as builtin hook in gateway/hooks.py
- Fires on agent:end events
- Checks both user message and agent response for crisis indicators
- Logs to file + sends Telegram alert when detected

Tests: tests/test_crisis_notify.py

Closes #705

gateway/builtin_hooks/crisis_notify.py

@@ -0,0 +1,145 @@
+"""Built-in crisis notification hook — detect crisis events and alert humans.
+
+Fires on agent:end events. Scans the conversation for crisis indicators
+and sends notifications when detected.
+
+Events: agent:end
+"""
+
+import json
+import logging
+import os
+import time
+from pathlib import Path
+
+logger = logging.getLogger("hooks.crisis-notify")
+
+from hermes_constants import get_hermes_home
+HERMES_HOME = get_hermes_home()
+CRISIS_LOG = HERMES_HOME / "crisis-events.log"
+
+# Crisis indicator patterns (case-insensitive)
+CRISIS_PATTERNS = [
+    "i want to die",
+    "i don't want to live",
+    "kill myself",
+    "end my life",
+    "suicide",
+    "suicidal",
+    "no reason to live",
+    "better off dead",
+    "can't go on",
+    "give up on life",
+    "want to disappear",
+    "ending it all",
+    "goodbye forever",
+    "final goodbye",
+]
+
+# Crisis severity levels
+CRISIS_LEVELS = {
+    "HIGH": ["kill myself", "suicide", "suicidal", "end my life", "ending it all"],
+    "MEDIUM": ["i want to die", "better off dead", "no reason to live", "give up on life"],
+    "LOW": ["can't go on", "want to disappear", "goodbye forever", "i don't want to live"],
+}
+
+
+def detect_crisis(text: str) -> tuple[bool, str, list[str]]:
+    """Detect crisis indicators in text.
+
+    Returns (is_crisis, severity, matched_patterns).
+    """
+    if not text:
+        return False, "", []
+
+    text_lower = text.lower()
+    matched = []
+
+    for pattern in CRISIS_PATTERNS:
+        if pattern in text_lower:
+            matched.append(pattern)
+
+    if not matched:
+        return False, "", []
+
+    # Determine severity
+    for level, keywords in CRISIS_LEVELS.items():
+        for kw in keywords:
+            if kw in text_lower:
+                return True, level, matched
+
+    return True, "LOW", matched
+
+
+def log_crisis_event(session_id: str, severity: str, patterns: list[str], message_preview: str) -> None:
+    """Log crisis event to file."""
+    try:
+        event = {
+            "timestamp": time.strftime("%Y-%m-%d %H:%M:%S"),
+            "session_id": session_id,
+            "severity": severity,
+            "patterns": patterns,
+            "message_preview": message_preview[:200],
+        }
+        with open(CRISIS_LOG, "a") as f:
+            f.write(json.dumps(event) + "\n")
+        logger.warning("Crisis event logged: %s [%s] session=%s", severity, patterns[0], session_id)
+    except Exception as e:
+        logger.error("Failed to log crisis event: %s", e)
+
+
+def send_telegram_crisis_alert(session_id: str, severity: str, patterns: list[str]) -> bool:
+    """Send Telegram notification for crisis event."""
+    token = os.getenv("ALERT_TELEGRAM_TOKEN", "") or os.getenv("TELEGRAM_BOT_TOKEN", "")
+    chat_id = os.getenv("ALERT_TELEGRAM_CHAT_ID", "") or os.getenv("CRISIS_ALERT_CHAT_ID", "")
+
+    if not token or not chat_id:
+        logger.debug("Telegram not configured for crisis alerts")
+        return False
+
+    import urllib.request
+    import urllib.parse
+
+    emoji = {"HIGH": "\U0001f6a8", "MEDIUM": "\u26a0\ufe0f", "LOW": "\U0001f4c8"}.get(severity, "\u26a0\ufe0f")
+
+    message = (
+        f"{emoji} CRISIS ALERT [{severity}]\n"
+        f"Session: {session_id}\n"
+        f"Detected: {', '.join(patterns[:3])}\n"
+        f"Action: Check session immediately"
+    )
+
+    url = f"https://api.telegram.org/bot{token}/sendMessage"
+    data = urllib.parse.urlencode({"chat_id": chat_id, "text": message}).encode()
+
+    try:
+        req = urllib.request.Request(url, data=data, method="POST")
+        with urllib.request.urlopen(req, timeout=10) as resp:
+            result = json.loads(resp.read())
+            return result.get("ok", False)
+    except Exception as e:
+        logger.error("Telegram crisis alert failed: %s", e)
+        return False
+
+
+async def handle(event_type: str, context: dict) -> None:
+    """Handle agent:end events — scan for crisis indicators."""
+    if event_type != "agent:end":
+        return
+
+    # Get the final response text
+    response = context.get("response", "") or context.get("final_response", "")
+    user_message = context.get("user_message", "") or context.get("message", "")
+    session_id = context.get("session_id", "unknown")
+
+    # Check both user message and agent response
+    for text, source in [(user_message, "user"), (response, "agent")]:
+        is_crisis, severity, patterns = detect_crisis(text)
+        if is_crisis:
+            log_crisis_event(session_id, severity, patterns, text)
+            send_telegram_crisis_alert(session_id, severity, patterns)
+            logger.warning(
+                "CRISIS DETECTED [%s] from %s in session %s: %s",
+                severity, source, session_id, patterns[:2],
+            )
+            break  # Only alert once per event

gateway/hooks.py

@@ -66,6 +66,20 @@ class HookRegistry:
         except Exception as e:
             print(f"[hooks] Could not load built-in boot-md hook: {e}", flush=True)
 
+        # Crisis notification hook — detect crisis events and alert humans
+        try:
+            from gateway.builtin_hooks.crisis_notify import handle as crisis_handle
+
+            self._handlers.setdefault("agent:end", []).append(crisis_handle)
+            self._loaded_hooks.append({
+                "name": "crisis-notify",
+                "description": "Detect crisis events and send Telegram alerts",
+                "events": ["agent:end"],
+                "path": "(builtin)",
+            })
+        except Exception as e:
+            print(f"[hooks] Could not load built-in crisis-notify hook: {e}", flush=True)
+
     def discover_and_load(self) -> None:
         """
         Scan the hooks directory for hook directories and load their handlers.

tests/test_crisis_notify.py

@@ -0,0 +1,71 @@
+"""Tests for crisis notification hook."""
+
+import json
+import pytest
+import sys
+import tempfile
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+
+from gateway.builtin_hooks.crisis_notify import detect_crisis, log_crisis_event
+
+
+class TestCrisisDetection:
+    def test_high_severity(self):
+        is_crisis, severity, patterns = detect_crisis("I want to kill myself")
+        assert is_crisis
+        assert severity == "HIGH"
+        assert len(patterns) > 0
+
+    def test_medium_severity(self):
+        is_crisis, severity, patterns = detect_crisis("I want to die")
+        assert is_crisis
+        assert severity in ("MEDIUM", "HIGH")
+
+    def test_low_severity(self):
+        is_crisis, severity, patterns = detect_crisis("I can't go on anymore")
+        assert is_crisis
+        assert severity in ("LOW", "MEDIUM")
+
+    def test_no_crisis(self):
+        is_crisis, severity, patterns = detect_crisis("I'm having a great day!")
+        assert not is_crisis
+        assert severity == ""
+
+    def test_empty_text(self):
+        is_crisis, severity, patterns = detect_crisis("")
+        assert not is_crisis
+
+    def test_none_text(self):
+        is_crisis, severity, patterns = detect_crisis(None)
+        assert not is_crisis
+
+    def test_suicide_keyword(self):
+        is_crisis, severity, patterns = detect_crisis("thinking about suicide")
+        assert is_crisis
+        assert severity == "HIGH"
+
+    def test_multiple_patterns(self):
+        is_crisis, severity, patterns = detect_crisis("I want to die and end my life")
+        assert is_crisis
+        assert len(patterns) >= 2
+
+
+class TestCrisisLogging:
+    def test_log_creates_file(self, tmp_path, monkeypatch):
+        monkeypatch.setattr("gateway.builtin_hooks.crisis_notify.CRISIS_LOG", tmp_path / "crisis.log")
+        log_crisis_event("session-123", "HIGH", ["kill myself"], "test message")
+        log_file = tmp_path / "crisis.log"
+        assert log_file.exists()
+        content = log_file.read_text()
+        data = json.loads(content.strip())
+        assert data["session_id"] == "session-123"
+        assert data["severity"] == "HIGH"
+
+    def test_log_appends(self, tmp_path, monkeypatch):
+        monkeypatch.setattr("gateway.builtin_hooks.crisis_notify.CRISIS_LOG", tmp_path / "crisis.log")
+        log_crisis_event("s1", "HIGH", ["a"], "msg1")
+        log_crisis_event("s2", "LOW", ["b"], "msg2")
+        lines = (tmp_path / "crisis.log").read_text().strip().split("\n")
+        assert len(lines) == 2