feat: add SMS (Twilio) platform adapter

Add SMS as a first-class messaging platform via the Twilio API.
Shares credentials with the existing telephony skill — same
TWILIO_ACCOUNT_SID, TWILIO_AUTH_TOKEN, TWILIO_PHONE_NUMBER env vars.

Adapter (gateway/platforms/sms.py):
- aiohttp webhook server for inbound (Twilio form-encoded POSTs)
- Twilio REST API with Basic auth for outbound
- Markdown stripping, smart chunking at 1600 chars
- Echo loop prevention, phone number redaction in logs

Integration (13 files):
- gateway config, run, channel_directory
- agent prompt_builder (SMS platform hint)
- cron scheduler, cronjob tools
- send_message_tool (_send_sms via Twilio API)
- toolsets (hermes-sms + hermes-gateway)
- gateway setup wizard, status display
- pyproject.toml (sms optional extra)
- 21 tests

Docs:
- website/docs/user-guide/messaging/sms.md (full setup guide)
- Updated messaging index (architecture, toolsets, security, links)
- Updated environment-variables.md reference

Inspired by PR #1575 (@sunsakis), rewritten for Twilio.

agent/prompt_builder.py

@@ -161,6 +161,11 @@ PLATFORM_HINTS = {
         "You are a CLI AI Agent. Try not to use markdown but simple text "
         "renderable inside a terminal."
     ),
+    "sms": (
+        "You are communicating via SMS. Keep responses concise and use plain text "
+        "only — no markdown, no formatting. SMS messages are limited to ~1600 "
+        "characters, so be brief and direct."
+    ),
 }
 
 CONTEXT_FILE_MAX_CHARS = 20_000

cron/scheduler.py

@@ -132,6 +132,7 @@ def _deliver_result(job: dict, content: str) -> None:
         "whatsapp": Platform.WHATSAPP,
         "signal": Platform.SIGNAL,
         "email": Platform.EMAIL,
+        "sms": Platform.SMS,
     }
     platform = platform_map.get(platform_name.lower())
     if not platform:

gateway/channel_directory.py

@@ -63,7 +63,7 @@ def build_channel_directory(adapters: Dict[Any, Any]) -> Dict[str, Any]:
             logger.warning("Channel directory: failed to build %s: %s", platform.value, e)
 
     # Telegram, WhatsApp & Signal can't enumerate chats -- pull from session history
-    for plat_name in ("telegram", "whatsapp", "signal", "email"):
+    for plat_name in ("telegram", "whatsapp", "signal", "email", "sms"):
         if plat_name not in platforms:
             platforms[plat_name] = _build_from_sessions(plat_name)
 

gateway/config.py

@@ -42,6 +42,7 @@ class Platform(Enum):
     SIGNAL = "signal"
     HOMEASSISTANT = "homeassistant"
     EMAIL = "email"
+    SMS = "sms"
     DINGTALK = "dingtalk"
 
 
@@ -232,6 +233,9 @@ class GatewayConfig:
             # Email uses extra dict for config (address + imap_host + smtp_host)
             elif platform == Platform.EMAIL and config.extra.get("address"):
                 connected.append(platform)
+            # SMS uses api_key (Twilio auth token) — SID checked via env
+            elif platform == Platform.SMS and os.getenv("TWILIO_ACCOUNT_SID"):
+                connected.append(platform)
         return connected
     
     def get_home_channel(self, platform: Platform) -> Optional[HomeChannel]:
@@ -564,6 +568,21 @@ def _apply_env_overrides(config: GatewayConfig) -> None:
                 name=os.getenv("EMAIL_HOME_ADDRESS_NAME", "Home"),
             )
 
+    # SMS (Twilio)
+    twilio_sid = os.getenv("TWILIO_ACCOUNT_SID")
+    if twilio_sid:
+        if Platform.SMS not in config.platforms:
+            config.platforms[Platform.SMS] = PlatformConfig()
+        config.platforms[Platform.SMS].enabled = True
+        config.platforms[Platform.SMS].api_key = os.getenv("TWILIO_AUTH_TOKEN", "")
+        sms_home = os.getenv("SMS_HOME_CHANNEL")
+        if sms_home:
+            config.platforms[Platform.SMS].home_channel = HomeChannel(
+                platform=Platform.SMS,
+                chat_id=sms_home,
+                name=os.getenv("SMS_HOME_CHANNEL_NAME", "Home"),
+            )
+
     # Session settings
     idle_minutes = os.getenv("SESSION_IDLE_MINUTES")
     if idle_minutes:

gateway/platforms/sms.py

@@ -0,0 +1,261 @@
+"""SMS (Twilio) platform adapter.
+
+Connects to the Twilio REST API for outbound SMS and runs an aiohttp
+webhook server to receive inbound messages.
+
+Shares credentials with the optional telephony skill — same env vars:
+  - TWILIO_ACCOUNT_SID
+  - TWILIO_AUTH_TOKEN
+  - TWILIO_PHONE_NUMBER  (E.164 from-number, e.g. +15551234567)
+
+Gateway-specific env vars:
+  - SMS_WEBHOOK_PORT     (default 8080)
+  - SMS_ALLOWED_USERS    (comma-separated E.164 phone numbers)
+  - SMS_ALLOW_ALL_USERS  (true/false)
+  - SMS_HOME_CHANNEL     (phone number for cron delivery)
+"""
+
+import asyncio
+import base64
+import json
+import logging
+import os
+import re
+import urllib.parse
+from typing import Any, Dict, List, Optional
+
+from gateway.config import Platform, PlatformConfig
+from gateway.platforms.base import (
+    BasePlatformAdapter,
+    MessageEvent,
+    MessageType,
+    SendResult,
+)
+
+logger = logging.getLogger(__name__)
+
+TWILIO_API_BASE = "https://api.twilio.com/2010-04-01/Accounts"
+MAX_SMS_LENGTH = 1600  # ~10 SMS segments
+DEFAULT_WEBHOOK_PORT = 8080
+
+# E.164 phone number pattern for redaction
+_PHONE_RE = re.compile(r"\+[1-9]\d{6,14}")
+
+
+def _redact_phone(phone: str) -> str:
+    """Redact a phone number for logging: +15551234567 -> +1555***4567."""
+    if not phone:
+        return "<none>"
+    if len(phone) <= 8:
+        return phone[:2] + "***" + phone[-2:] if len(phone) > 4 else "****"
+    return phone[:5] + "***" + phone[-4:]
+
+
+def check_sms_requirements() -> bool:
+    """Check if SMS adapter dependencies are available."""
+    try:
+        import aiohttp  # noqa: F401
+    except ImportError:
+        return False
+    return bool(os.getenv("TWILIO_ACCOUNT_SID") and os.getenv("TWILIO_AUTH_TOKEN"))
+
+
+class SmsAdapter(BasePlatformAdapter):
+    """
+    Twilio SMS <-> Hermes gateway adapter.
+
+    Each inbound phone number gets its own Hermes session (multi-tenant).
+    Replies are always sent from the configured TWILIO_PHONE_NUMBER.
+    """
+
+    MAX_MESSAGE_LENGTH = MAX_SMS_LENGTH
+
+    def __init__(self, config: PlatformConfig):
+        super().__init__(config, Platform.SMS)
+        self._account_sid: str = os.environ["TWILIO_ACCOUNT_SID"]
+        self._auth_token: str = os.environ["TWILIO_AUTH_TOKEN"]
+        self._from_number: str = os.getenv("TWILIO_PHONE_NUMBER", "")
+        self._webhook_port: int = int(
+            os.getenv("SMS_WEBHOOK_PORT", str(DEFAULT_WEBHOOK_PORT))
+        )
+        self._runner = None
+
+    def _basic_auth_header(self) -> str:
+        """Build HTTP Basic auth header value for Twilio."""
+        creds = f"{self._account_sid}:{self._auth_token}"
+        encoded = base64.b64encode(creds.encode("ascii")).decode("ascii")
+        return f"Basic {encoded}"
+
+    # ------------------------------------------------------------------
+    # Required abstract methods
+    # ------------------------------------------------------------------
+
+    async def connect(self) -> bool:
+        import aiohttp
+        from aiohttp import web
+
+        if not self._from_number:
+            logger.error("[sms] TWILIO_PHONE_NUMBER not set — cannot send replies")
+            return False
+
+        app = web.Application()
+        app.router.add_post("/webhooks/twilio", self._handle_webhook)
+        app.router.add_get("/health", lambda _: web.Response(text="ok"))
+
+        self._runner = web.AppRunner(app)
+        await self._runner.setup()
+        site = web.TCPSite(self._runner, "0.0.0.0", self._webhook_port)
+        await site.start()
+        self._running = True
+
+        logger.info(
+            "[sms] Twilio webhook server listening on port %d, from: %s",
+            self._webhook_port,
+            _redact_phone(self._from_number),
+        )
+        return True
+
+    async def disconnect(self) -> None:
+        if self._runner:
+            await self._runner.cleanup()
+            self._runner = None
+        self._running = False
+        logger.info("[sms] Disconnected")
+
+    async def send(
+        self,
+        chat_id: str,
+        content: str,
+        reply_to: Optional[str] = None,
+        metadata: Optional[Dict[str, Any]] = None,
+    ) -> SendResult:
+        import aiohttp
+
+        formatted = self.format_message(content)
+        chunks = self.truncate_message(formatted)
+        last_result = SendResult(success=True)
+
+        url = f"{TWILIO_API_BASE}/{self._account_sid}/Messages.json"
+        headers = {
+            "Authorization": self._basic_auth_header(),
+        }
+
+        async with aiohttp.ClientSession() as session:
+            for chunk in chunks:
+                form_data = aiohttp.FormData()
+                form_data.add_field("From", self._from_number)
+                form_data.add_field("To", chat_id)
+                form_data.add_field("Body", chunk)
+
+                try:
+                    async with session.post(url, data=form_data, headers=headers) as resp:
+                        body = await resp.json()
+                        if resp.status >= 400:
+                            error_msg = body.get("message", str(body))
+                            logger.error(
+                                "[sms] send failed to %s: %s %s",
+                                _redact_phone(chat_id),
+                                resp.status,
+                                error_msg,
+                            )
+                            return SendResult(
+                                success=False,
+                                error=f"Twilio {resp.status}: {error_msg}",
+                            )
+                        msg_sid = body.get("sid", "")
+                        last_result = SendResult(success=True, message_id=msg_sid)
+                except Exception as e:
+                    logger.error("[sms] send error to %s: %s", _redact_phone(chat_id), e)
+                    return SendResult(success=False, error=str(e))
+
+        return last_result
+
+    async def get_chat_info(self, chat_id: str) -> Dict[str, Any]:
+        return {"name": chat_id, "type": "dm"}
+
+    # ------------------------------------------------------------------
+    # SMS-specific formatting
+    # ------------------------------------------------------------------
+
+    def format_message(self, content: str) -> str:
+        """Strip markdown — SMS renders it as literal characters."""
+        content = re.sub(r"\*\*(.+?)\*\*", r"\1", content, flags=re.DOTALL)
+        content = re.sub(r"\*(.+?)\*", r"\1", content, flags=re.DOTALL)
+        content = re.sub(r"__(.+?)__", r"\1", content, flags=re.DOTALL)
+        content = re.sub(r"_(.+?)_", r"\1", content, flags=re.DOTALL)
+        content = re.sub(r"```[a-z]*\n?", "", content)
+        content = re.sub(r"`(.+?)`", r"\1", content)
+        content = re.sub(r"^#{1,6}\s+", "", content, flags=re.MULTILINE)
+        content = re.sub(r"\[([^\]]+)\]\([^\)]+\)", r"\1", content)
+        content = re.sub(r"\n{3,}", "\n\n", content)
+        return content.strip()
+
+    # ------------------------------------------------------------------
+    # Twilio webhook handler
+    # ------------------------------------------------------------------
+
+    async def _handle_webhook(self, request) -> "aiohttp.web.Response":
+        from aiohttp import web
+
+        try:
+            raw = await request.read()
+            # Twilio sends form-encoded data, not JSON
+            form = urllib.parse.parse_qs(raw.decode("utf-8"))
+        except Exception as e:
+            logger.error("[sms] webhook parse error: %s", e)
+            return web.Response(
+                text='<?xml version="1.0" encoding="UTF-8"?><Response></Response>',
+                content_type="application/xml",
+                status=400,
+            )
+
+        # Extract fields (parse_qs returns lists)
+        from_number = (form.get("From", [""]))[0].strip()
+        to_number = (form.get("To", [""]))[0].strip()
+        text = (form.get("Body", [""]))[0].strip()
+        message_sid = (form.get("MessageSid", [""]))[0].strip()
+
+        if not from_number or not text:
+            return web.Response(
+                text='<?xml version="1.0" encoding="UTF-8"?><Response></Response>',
+                content_type="application/xml",
+            )
+
+        # Ignore messages from our own number (echo prevention)
+        if from_number == self._from_number:
+            logger.debug("[sms] ignoring echo from own number %s", _redact_phone(from_number))
+            return web.Response(
+                text='<?xml version="1.0" encoding="UTF-8"?><Response></Response>',
+                content_type="application/xml",
+            )
+
+        logger.info(
+            "[sms] inbound from %s -> %s: %s",
+            _redact_phone(from_number),
+            _redact_phone(to_number),
+            text[:80],
+        )
+
+        source = self.build_source(
+            chat_id=from_number,
+            chat_name=from_number,
+            chat_type="dm",
+            user_id=from_number,
+            user_name=from_number,
+        )
+        event = MessageEvent(
+            text=text,
+            message_type=MessageType.TEXT,
+            source=source,
+            raw_message=form,
+            message_id=message_sid,
+        )
+
+        # Non-blocking: Twilio expects a fast response
+        asyncio.create_task(self.handle_message(event))
+
+        # Return empty TwiML — we send replies via the REST API, not inline TwiML
+        return web.Response(
+            text='<?xml version="1.0" encoding="UTF-8"?><Response></Response>',
+            content_type="application/xml",
+        )

gateway/run.py

@@ -848,6 +848,7 @@ class GatewayRunner:
             os.getenv(v)
             for v in ("TELEGRAM_ALLOWED_USERS", "DISCORD_ALLOWED_USERS",
                        "WHATSAPP_ALLOWED_USERS", "SLACK_ALLOWED_USERS",
+                       "SMS_ALLOWED_USERS",
                        "GATEWAY_ALLOWED_USERS")
         )
         _allow_all = os.getenv("GATEWAY_ALLOW_ALL_USERS", "").lower() in ("true", "1", "yes")
@@ -1132,6 +1133,13 @@ class GatewayRunner:
                 return None
             return EmailAdapter(config)
 
+        elif platform == Platform.SMS:
+            from gateway.platforms.sms import SmsAdapter, check_sms_requirements
+            if not check_sms_requirements():
+                logger.warning("SMS: aiohttp not installed or TWILIO_ACCOUNT_SID/TWILIO_AUTH_TOKEN not set")
+                return None
+            return SmsAdapter(config)
+
         elif platform == Platform.DINGTALK:
             from gateway.platforms.dingtalk import DingTalkAdapter, check_dingtalk_requirements
             if not check_dingtalk_requirements():
@@ -1169,6 +1177,7 @@ class GatewayRunner:
             Platform.SLACK: "SLACK_ALLOWED_USERS",
             Platform.SIGNAL: "SIGNAL_ALLOWED_USERS",
             Platform.EMAIL: "EMAIL_ALLOWED_USERS",
+            Platform.SMS: "SMS_ALLOWED_USERS",
         }
         platform_allow_all_map = {
             Platform.TELEGRAM: "TELEGRAM_ALLOW_ALL_USERS",
@@ -1177,6 +1186,7 @@ class GatewayRunner:
             Platform.SLACK: "SLACK_ALLOW_ALL_USERS",
             Platform.SIGNAL: "SIGNAL_ALLOW_ALL_USERS",
             Platform.EMAIL: "EMAIL_ALLOW_ALL_USERS",
+            Platform.SMS: "SMS_ALLOW_ALL_USERS",
         }
 
         # Per-platform allow-all flag (e.g., DISCORD_ALLOW_ALL_USERS=true)

hermes_cli/gateway.py

@@ -1039,6 +1039,33 @@ _PLATFORMS = [
              "help": "Only emails from these addresses will be processed."},
         ],
     },
+    {
+        "key": "sms",
+        "label": "SMS (Twilio)",
+        "emoji": "📱",
+        "token_var": "TWILIO_ACCOUNT_SID",
+        "setup_instructions": [
+            "1. Create a Twilio account at https://www.twilio.com/",
+            "2. Get your Account SID and Auth Token from the Twilio Console dashboard",
+            "3. Buy or configure a phone number capable of sending SMS",
+            "4. Set up your webhook URL for inbound SMS:",
+            "   Twilio Console → Phone Numbers → Active Numbers → your number",
+            "   → Messaging → A MESSAGE COMES IN → Webhook → https://your-server:8080/webhooks/twilio",
+        ],
+        "vars": [
+            {"name": "TWILIO_ACCOUNT_SID", "prompt": "Twilio Account SID", "password": False,
+             "help": "Found on the Twilio Console dashboard."},
+            {"name": "TWILIO_AUTH_TOKEN", "prompt": "Twilio Auth Token", "password": True,
+             "help": "Found on the Twilio Console dashboard (click to reveal)."},
+            {"name": "TWILIO_PHONE_NUMBER", "prompt": "Twilio phone number (E.164 format, e.g. +15551234567)", "password": False,
+             "help": "The Twilio phone number to send SMS from."},
+            {"name": "SMS_ALLOWED_USERS", "prompt": "Allowed phone numbers (comma-separated, E.164 format)", "password": False,
+             "is_allowlist": True,
+             "help": "Only messages from these phone numbers will be processed."},
+            {"name": "SMS_HOME_CHANNEL", "prompt": "Home channel phone number (for cron/notification delivery, or empty)", "password": False,
+             "help": "Phone number to deliver cron job results and notifications to."},
+        ],
+    },
 ]
 
 

hermes_cli/status.py

@@ -252,6 +252,7 @@ def show_status(args):
         "Signal": ("SIGNAL_HTTP_URL", "SIGNAL_HOME_CHANNEL"),
         "Slack": ("SLACK_BOT_TOKEN", None),
         "Email": ("EMAIL_ADDRESS", "EMAIL_HOME_ADDRESS"),
+        "SMS": ("TWILIO_ACCOUNT_SID", "SMS_HOME_CHANNEL"),
     }
     
     for name, (token_var, home_var) in platforms.items():

pyproject.toml

@@ -56,6 +56,7 @@ pty = [
 honcho = ["honcho-ai>=2.0.1"]
 mcp = ["mcp>=1.2.0"]
 homeassistant = ["aiohttp>=3.9.0"]
+sms = ["aiohttp>=3.9.0"]
 acp = ["agent-client-protocol>=0.8.1,<1.0"]
 rl = [
   "atroposlib @ git+https://github.com/NousResearch/atropos.git",
@@ -78,6 +79,7 @@ all = [
   "hermes-agent[honcho]",
   "hermes-agent[mcp]",
   "hermes-agent[homeassistant]",
+  "hermes-agent[sms]",
   "hermes-agent[acp]",
   "hermes-agent[voice]",
 ]

tests/gateway/test_sms.py

@@ -0,0 +1,215 @@
+"""Tests for SMS (Twilio) platform integration.
+
+Covers config loading, format/truncate, echo prevention,
+requirements check, and toolset verification.
+"""
+
+import os
+from unittest.mock import patch
+
+import pytest
+
+from gateway.config import Platform, PlatformConfig, HomeChannel
+
+
+# ── Config loading ──────────────────────────────────────────────────
+
+class TestSmsConfigLoading:
+    """Verify _apply_env_overrides wires SMS correctly."""
+
+    def test_sms_platform_enum_exists(self):
+        assert Platform.SMS.value == "sms"
+
+    def test_env_overrides_create_sms_config(self):
+        from gateway.config import load_gateway_config
+
+        env = {
+            "TWILIO_ACCOUNT_SID": "ACtest123",
+            "TWILIO_AUTH_TOKEN": "token_abc",
+            "TWILIO_PHONE_NUMBER": "+15551234567",
+        }
+        with patch.dict(os.environ, env, clear=False):
+            config = load_gateway_config()
+            assert Platform.SMS in config.platforms
+            pc = config.platforms[Platform.SMS]
+            assert pc.enabled is True
+            assert pc.api_key == "token_abc"
+
+    def test_env_overrides_set_home_channel(self):
+        from gateway.config import load_gateway_config
+
+        env = {
+            "TWILIO_ACCOUNT_SID": "ACtest123",
+            "TWILIO_AUTH_TOKEN": "token_abc",
+            "TWILIO_PHONE_NUMBER": "+15551234567",
+            "SMS_HOME_CHANNEL": "+15559876543",
+            "SMS_HOME_CHANNEL_NAME": "My Phone",
+        }
+        with patch.dict(os.environ, env, clear=False):
+            config = load_gateway_config()
+            hc = config.platforms[Platform.SMS].home_channel
+            assert hc is not None
+            assert hc.chat_id == "+15559876543"
+            assert hc.name == "My Phone"
+            assert hc.platform == Platform.SMS
+
+    def test_sms_in_connected_platforms(self):
+        from gateway.config import load_gateway_config
+
+        env = {
+            "TWILIO_ACCOUNT_SID": "ACtest123",
+            "TWILIO_AUTH_TOKEN": "token_abc",
+        }
+        with patch.dict(os.environ, env, clear=False):
+            config = load_gateway_config()
+            connected = config.get_connected_platforms()
+            assert Platform.SMS in connected
+
+
+# ── Format / truncate ───────────────────────────────────────────────
+
+class TestSmsFormatAndTruncate:
+    """Test SmsAdapter.format_message strips markdown."""
+
+    def _make_adapter(self):
+        from gateway.platforms.sms import SmsAdapter
+
+        env = {
+            "TWILIO_ACCOUNT_SID": "ACtest",
+            "TWILIO_AUTH_TOKEN": "tok",
+            "TWILIO_PHONE_NUMBER": "+15550001111",
+        }
+        with patch.dict(os.environ, env):
+            pc = PlatformConfig(enabled=True, api_key="tok")
+            adapter = object.__new__(SmsAdapter)
+            adapter.config = pc
+            adapter._platform = Platform.SMS
+            adapter._account_sid = "ACtest"
+            adapter._auth_token = "tok"
+            adapter._from_number = "+15550001111"
+        return adapter
+
+    def test_strips_bold(self):
+        adapter = self._make_adapter()
+        assert adapter.format_message("**hello**") == "hello"
+
+    def test_strips_italic(self):
+        adapter = self._make_adapter()
+        assert adapter.format_message("*world*") == "world"
+
+    def test_strips_code_blocks(self):
+        adapter = self._make_adapter()
+        result = adapter.format_message("```python\nprint('hi')\n```")
+        assert "```" not in result
+        assert "print('hi')" in result
+
+    def test_strips_inline_code(self):
+        adapter = self._make_adapter()
+        assert adapter.format_message("`code`") == "code"
+
+    def test_strips_headers(self):
+        adapter = self._make_adapter()
+        assert adapter.format_message("## Title") == "Title"
+
+    def test_strips_links(self):
+        adapter = self._make_adapter()
+        assert adapter.format_message("[click](https://example.com)") == "click"
+
+    def test_collapses_newlines(self):
+        adapter = self._make_adapter()
+        result = adapter.format_message("a\n\n\n\nb")
+        assert result == "a\n\nb"
+
+
+# ── Echo prevention ────────────────────────────────────────────────
+
+class TestSmsEchoPrevention:
+    """Adapter should ignore messages from its own number."""
+
+    def test_own_number_detection(self):
+        """The adapter stores _from_number for echo prevention."""
+        from gateway.platforms.sms import SmsAdapter
+
+        env = {
+            "TWILIO_ACCOUNT_SID": "ACtest",
+            "TWILIO_AUTH_TOKEN": "tok",
+            "TWILIO_PHONE_NUMBER": "+15550001111",
+        }
+        with patch.dict(os.environ, env):
+            pc = PlatformConfig(enabled=True, api_key="tok")
+            adapter = SmsAdapter(pc)
+            assert adapter._from_number == "+15550001111"
+
+
+# ── Requirements check ─────────────────────────────────────────────
+
+class TestSmsRequirements:
+    def test_check_sms_requirements_missing_sid(self):
+        from gateway.platforms.sms import check_sms_requirements
+
+        env = {"TWILIO_AUTH_TOKEN": "tok"}
+        with patch.dict(os.environ, env, clear=True):
+            assert check_sms_requirements() is False
+
+    def test_check_sms_requirements_missing_token(self):
+        from gateway.platforms.sms import check_sms_requirements
+
+        env = {"TWILIO_ACCOUNT_SID": "ACtest"}
+        with patch.dict(os.environ, env, clear=True):
+            assert check_sms_requirements() is False
+
+    def test_check_sms_requirements_both_set(self):
+        from gateway.platforms.sms import check_sms_requirements
+
+        env = {
+            "TWILIO_ACCOUNT_SID": "ACtest",
+            "TWILIO_AUTH_TOKEN": "tok",
+        }
+        with patch.dict(os.environ, env, clear=False):
+            # Only returns True if aiohttp is also importable
+            result = check_sms_requirements()
+            try:
+                import aiohttp  # noqa: F401
+                assert result is True
+            except ImportError:
+                assert result is False
+
+
+# ── Toolset verification ───────────────────────────────────────────
+
+class TestSmsToolset:
+    def test_hermes_sms_toolset_exists(self):
+        from toolsets import get_toolset
+
+        ts = get_toolset("hermes-sms")
+        assert ts is not None
+        assert "tools" in ts
+
+    def test_hermes_sms_in_gateway_includes(self):
+        from toolsets import get_toolset
+
+        gw = get_toolset("hermes-gateway")
+        assert gw is not None
+        assert "hermes-sms" in gw["includes"]
+
+    def test_sms_platform_hint_exists(self):
+        from agent.prompt_builder import PLATFORM_HINTS
+
+        assert "sms" in PLATFORM_HINTS
+        assert "concise" in PLATFORM_HINTS["sms"].lower()
+
+    def test_sms_in_scheduler_platform_map(self):
+        """Verify cron scheduler recognizes 'sms' as a valid platform."""
+        # Just check the Platform enum has SMS — the scheduler imports it dynamically
+        assert Platform.SMS.value == "sms"
+
+    def test_sms_in_send_message_platform_map(self):
+        """Verify send_message_tool recognizes 'sms'."""
+        # The platform_map is built inside _handle_send; verify SMS enum exists
+        assert hasattr(Platform, "SMS")
+
+    def test_sms_in_cronjob_deliver_description(self):
+        """Verify cronjob_tools mentions sms in deliver description."""
+        from tools.cronjob_tools import CRONJOB_SCHEMA
+        deliver_desc = CRONJOB_SCHEMA["parameters"]["properties"]["deliver"]["description"]
+        assert "sms" in deliver_desc.lower()

tools/cronjob_tools.py

@@ -372,7 +372,7 @@ Important safety rule: cron-run sessions should not recursively schedule more cr
             },
             "deliver": {
                 "type": "string",
-                "description": "Delivery target: origin, local, telegram, discord, signal, or platform:chat_id"
+                "description": "Delivery target: origin, local, telegram, discord, signal, sms, or platform:chat_id"
             },
             "model": {
                 "type": "string",

tools/send_message_tool.py

@@ -125,6 +125,7 @@ def _handle_send(args):
         "whatsapp": Platform.WHATSAPP,
         "signal": Platform.SIGNAL,
         "email": Platform.EMAIL,
+        "sms": Platform.SMS,
     }
     platform = platform_map.get(platform_name)
     if not platform:
@@ -334,6 +335,8 @@ async def _send_to_platform(platform, pconfig, chat_id, message, thread_id=None,
             result = await _send_signal(pconfig.extra, chat_id, chunk)
         elif platform == Platform.EMAIL:
             result = await _send_email(pconfig.extra, chat_id, chunk)
+        elif platform == Platform.SMS:
+            result = await _send_sms(pconfig.api_key, chat_id, chunk)
         else:
             result = {"error": f"Direct sending not yet implemented for {platform.value}"}
 
@@ -562,6 +565,59 @@ async def _send_email(extra, chat_id, message):
         return {"error": f"Email send failed: {e}"}
 
 
+async def _send_sms(auth_token, chat_id, message):
+    """Send a single SMS via Twilio REST API.
+
+    Uses HTTP Basic auth (Account SID : Auth Token) and form-encoded POST.
+    Chunking is handled by _send_to_platform() before this is called.
+    """
+    try:
+        import aiohttp
+    except ImportError:
+        return {"error": "aiohttp not installed. Run: pip install aiohttp"}
+
+    import base64
+
+    account_sid = os.getenv("TWILIO_ACCOUNT_SID", "")
+    from_number = os.getenv("TWILIO_PHONE_NUMBER", "")
+    if not account_sid or not auth_token or not from_number:
+        return {"error": "SMS not configured (TWILIO_ACCOUNT_SID, TWILIO_AUTH_TOKEN, TWILIO_PHONE_NUMBER required)"}
+
+    # Strip markdown — SMS renders it as literal characters
+    message = re.sub(r"\*\*(.+?)\*\*", r"\1", message, flags=re.DOTALL)
+    message = re.sub(r"\*(.+?)\*", r"\1", message, flags=re.DOTALL)
+    message = re.sub(r"__(.+?)__", r"\1", message, flags=re.DOTALL)
+    message = re.sub(r"_(.+?)_", r"\1", message, flags=re.DOTALL)
+    message = re.sub(r"```[a-z]*\n?", "", message)
+    message = re.sub(r"`(.+?)`", r"\1", message)
+    message = re.sub(r"^#{1,6}\s+", "", message, flags=re.MULTILINE)
+    message = re.sub(r"\[([^\]]+)\]\([^\)]+\)", r"\1", message)
+    message = re.sub(r"\n{3,}", "\n\n", message)
+    message = message.strip()
+
+    try:
+        creds = f"{account_sid}:{auth_token}"
+        encoded = base64.b64encode(creds.encode("ascii")).decode("ascii")
+        url = f"https://api.twilio.com/2010-04-01/Accounts/{account_sid}/Messages.json"
+        headers = {"Authorization": f"Basic {encoded}"}
+
+        async with aiohttp.ClientSession() as session:
+            form_data = aiohttp.FormData()
+            form_data.add_field("From", from_number)
+            form_data.add_field("To", chat_id)
+            form_data.add_field("Body", message)
+
+            async with session.post(url, data=form_data, headers=headers) as resp:
+                body = await resp.json()
+                if resp.status >= 400:
+                    error_msg = body.get("message", str(body))
+                    return {"error": f"Twilio API error ({resp.status}): {error_msg}"}
+                msg_sid = body.get("sid", "")
+                return {"success": True, "platform": "sms", "chat_id": chat_id, "message_id": msg_sid}
+    except Exception as e:
+        return {"error": f"SMS send failed: {e}"}
+
+
 def _check_send_message():
     """Gate send_message on gateway running (always available on messaging platforms)."""
     platform = os.getenv("HERMES_SESSION_PLATFORM", "")

toolsets.py

@@ -292,10 +292,16 @@ TOOLSETS = {
         "includes": []
     },
 
+    "hermes-sms": {
+        "description": "SMS bot toolset - interact with Hermes via SMS (Twilio)",
+        "tools": _HERMES_CORE_TOOLS,
+        "includes": []
+    },
+
     "hermes-gateway": {
         "description": "Gateway toolset - union of all messaging platform tools",
         "tools": [],
-        "includes": ["hermes-telegram", "hermes-discord", "hermes-whatsapp", "hermes-slack", "hermes-signal", "hermes-homeassistant", "hermes-email"]
+        "includes": ["hermes-telegram", "hermes-discord", "hermes-whatsapp", "hermes-slack", "hermes-signal", "hermes-homeassistant", "hermes-email", "hermes-sms"]
     }
 }
 

website/docs/reference/environment-variables.md

@@ -152,6 +152,14 @@ For native Anthropic auth, Hermes prefers Claude Code's own credential files whe
 | `SIGNAL_HOME_CHANNEL_NAME` | Display name for the Signal home channel |
 | `SIGNAL_IGNORE_STORIES` | Ignore Signal stories/status updates |
 | `SIGNAL_ALLOW_ALL_USERS` | Allow all Signal users without an allowlist |
+| `TWILIO_ACCOUNT_SID` | Twilio Account SID (shared with telephony skill) |
+| `TWILIO_AUTH_TOKEN` | Twilio Auth Token (shared with telephony skill) |
+| `TWILIO_PHONE_NUMBER` | Twilio phone number in E.164 format (shared with telephony skill) |
+| `SMS_WEBHOOK_PORT` | Webhook listener port for inbound SMS (default: `8080`) |
+| `SMS_ALLOWED_USERS` | Comma-separated E.164 phone numbers allowed to chat |
+| `SMS_ALLOW_ALL_USERS` | Allow all SMS senders without an allowlist |
+| `SMS_HOME_CHANNEL` | Phone number for cron job / notification delivery |
+| `SMS_HOME_CHANNEL_NAME` | Display name for the SMS home channel |
 | `EMAIL_ADDRESS` | Email address for the Email gateway adapter |
 | `EMAIL_PASSWORD` | Password or app password for the email account |
 | `EMAIL_IMAP_HOST` | IMAP hostname for the email adapter |

website/docs/user-guide/messaging/index.md

@@ -1,12 +1,12 @@
 ---
 sidebar_position: 1
 title: "Messaging Gateway"
-description: "Chat with Hermes from Telegram, Discord, Slack, WhatsApp, Signal, Email, Home Assistant, or your browser — architecture and setup overview"
+description: "Chat with Hermes from Telegram, Discord, Slack, WhatsApp, Signal, SMS, Email, Home Assistant, or your browser — architecture and setup overview"
 ---
 
 # Messaging Gateway
 
-Chat with Hermes from Telegram, Discord, Slack, WhatsApp, Signal, Email, Home Assistant, or your browser. The gateway is a single background process that connects to all your configured platforms, handles sessions, runs cron jobs, and delivers voice messages.
+Chat with Hermes from Telegram, Discord, Slack, WhatsApp, Signal, SMS, Email, Home Assistant, or your browser. The gateway is a single background process that connects to all your configured platforms, handles sessions, runs cron jobs, and delivers voice messages.
 
 For the full voice feature set — including CLI microphone mode, spoken replies in messaging, and Discord voice-channel conversations — see [Voice Mode](/docs/user-guide/features/voice-mode) and [Use Voice Mode with Hermes](/docs/guides/use-voice-mode-with-hermes).
 
@@ -21,6 +21,7 @@ flowchart TB
             wa[WhatsApp]
             sl[Slack]
             sig[Signal]
+            sms[SMS]
             em[Email]
             ha[Home Assistant]
         end
@@ -35,6 +36,7 @@ flowchart TB
     wa --> store
     sl --> store
     sig --> store
+    sms --> store
     em --> store
     ha --> store
     store --> agent
@@ -129,6 +131,7 @@ Configure per-platform overrides in `~/.hermes/gateway.json`:
 TELEGRAM_ALLOWED_USERS=123456789,987654321
 DISCORD_ALLOWED_USERS=123456789012345678
 SIGNAL_ALLOWED_USERS=+155****4567,+155****6543
+SMS_ALLOWED_USERS=+155****4567,+155****6543
 EMAIL_ALLOWED_USERS=trusted@example.com,colleague@work.com
 
 # Or allow
@@ -288,6 +291,7 @@ Each platform has its own toolset:
 | WhatsApp | `hermes-whatsapp` | Full tools including terminal |
 | Slack | `hermes-slack` | Full tools including terminal |
 | Signal | `hermes-signal` | Full tools including terminal |
+| SMS | `hermes-sms` | Full tools including terminal |
 | Email | `hermes-email` | Full tools including terminal |
 | Home Assistant | `hermes-homeassistant` | Full tools + HA device control (ha_list_entities, ha_get_state, ha_call_service, ha_list_services) |
 
@@ -298,5 +302,6 @@ Each platform has its own toolset:
 - [Slack Setup](slack.md)
 - [WhatsApp Setup](whatsapp.md)
 - [Signal Setup](signal.md)
+- [SMS Setup (Twilio)](sms.md)
 - [Email Setup](email.md)
 - [Home Assistant Integration](homeassistant.md)

website/docs/user-guide/messaging/sms.md

@@ -0,0 +1,175 @@
+---
+sidebar_position: 8
+title: "SMS (Twilio)"
+description: "Set up Hermes Agent as an SMS chatbot via Twilio"
+---
+
+# SMS Setup (Twilio)
+
+Hermes connects to SMS through the [Twilio](https://www.twilio.com/) API. People text your Twilio phone number and get AI responses back — same conversational experience as Telegram or Discord, but over standard text messages.
+
+:::info Shared Credentials
+The SMS gateway shares credentials with the optional [telephony skill](/docs/reference/skills-catalog). If you've already set up Twilio for voice calls or one-off SMS, the gateway works with the same `TWILIO_ACCOUNT_SID`, `TWILIO_AUTH_TOKEN`, and `TWILIO_PHONE_NUMBER`.
+:::
+
+---
+
+## Prerequisites
+
+- **Twilio account** — [Sign up at twilio.com](https://www.twilio.com/try-twilio) (free trial available)
+- **A Twilio phone number** with SMS capability
+- **A publicly accessible server** — Twilio sends webhooks to your server when SMS arrives
+- **aiohttp** — `pip install 'hermes-agent[sms]'`
+
+---
+
+## Step 1: Get Your Twilio Credentials
+
+1. Go to the [Twilio Console](https://console.twilio.com/)
+2. Copy your **Account SID** and **Auth Token** from the dashboard
+3. Go to **Phone Numbers → Manage → Active Numbers** — note your phone number in E.164 format (e.g., `+15551234567`)
+
+---
+
+## Step 2: Configure Hermes
+
+### Interactive setup (recommended)
+
+```bash
+hermes gateway setup
+```
+
+Select **SMS (Twilio)** from the platform list. The wizard will prompt for your credentials.
+
+### Manual setup
+
+Add to `~/.hermes/.env`:
+
+```bash
+TWILIO_ACCOUNT_SID=ACxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+TWILIO_AUTH_TOKEN=your_auth_token_here
+TWILIO_PHONE_NUMBER=+15551234567
+
+# Security: restrict to specific phone numbers (recommended)
+SMS_ALLOWED_USERS=+15559876543,+15551112222
+
+# Optional: set a home channel for cron job delivery
+SMS_HOME_CHANNEL=+15559876543
+```
+
+---
+
+## Step 3: Configure Twilio Webhook
+
+Twilio needs to know where to send incoming messages. In the [Twilio Console](https://console.twilio.com/):
+
+1. Go to **Phone Numbers → Manage → Active Numbers**
+2. Click your phone number
+3. Under **Messaging → A MESSAGE COMES IN**, set:
+   - **Webhook**: `https://your-server:8080/webhooks/twilio`
+   - **HTTP Method**: `POST`
+
+:::tip Exposing Your Webhook
+If you're running Hermes locally, use a tunnel to expose the webhook:
+
+```bash
+# Using cloudflared
+cloudflared tunnel --url http://localhost:8080
+
+# Using ngrok
+ngrok http 8080
+```
+
+Set the resulting public URL as your Twilio webhook.
+:::
+
+The webhook port defaults to `8080`. Override with:
+
+```bash
+SMS_WEBHOOK_PORT=3000
+```
+
+---
+
+## Step 4: Start the Gateway
+
+```bash
+hermes gateway
+```
+
+You should see:
+
+```
+[sms] Twilio webhook server listening on port 8080, from: +1555***4567
+```
+
+Text your Twilio number — Hermes will respond via SMS.
+
+---
+
+## Environment Variables
+
+| Variable | Required | Description |
+|----------|----------|-------------|
+| `TWILIO_ACCOUNT_SID` | Yes | Twilio Account SID (starts with `AC`) |
+| `TWILIO_AUTH_TOKEN` | Yes | Twilio Auth Token |
+| `TWILIO_PHONE_NUMBER` | Yes | Your Twilio phone number (E.164 format) |
+| `SMS_WEBHOOK_PORT` | No | Webhook listener port (default: `8080`) |
+| `SMS_ALLOWED_USERS` | No | Comma-separated E.164 phone numbers allowed to chat |
+| `SMS_ALLOW_ALL_USERS` | No | Set to `true` to allow anyone (not recommended) |
+| `SMS_HOME_CHANNEL` | No | Phone number for cron job / notification delivery |
+| `SMS_HOME_CHANNEL_NAME` | No | Display name for the home channel (default: `Home`) |
+
+---
+
+## SMS-Specific Behavior
+
+- **Plain text only** — Markdown is automatically stripped since SMS renders it as literal characters
+- **1600 character limit** — Longer responses are split across multiple messages at natural boundaries (newlines, then spaces)
+- **Echo prevention** — Messages from your own Twilio number are ignored to prevent loops
+- **Phone number redaction** — Phone numbers are redacted in logs for privacy
+
+---
+
+## Security
+
+**The gateway denies all users by default.** Configure an allowlist:
+
+```bash
+# Recommended: restrict to specific phone numbers
+SMS_ALLOWED_USERS=+15559876543,+15551112222
+
+# Or allow all (NOT recommended for bots with terminal access)
+SMS_ALLOW_ALL_USERS=true
+```
+
+:::warning
+SMS has no built-in encryption. Don't use SMS for sensitive operations unless you understand the security implications. For sensitive use cases, prefer Signal or Telegram.
+:::
+
+---
+
+## Troubleshooting
+
+### Messages not arriving
+
+1. Check your Twilio webhook URL is correct and publicly accessible
+2. Verify `TWILIO_ACCOUNT_SID` and `TWILIO_AUTH_TOKEN` are correct
+3. Check the Twilio Console → **Monitor → Logs → Messaging** for delivery errors
+4. Ensure your phone number is in `SMS_ALLOWED_USERS` (or `SMS_ALLOW_ALL_USERS=true`)
+
+### Replies not sending
+
+1. Check `TWILIO_PHONE_NUMBER` is set correctly (E.164 format with `+`)
+2. Verify your Twilio account has SMS-capable numbers
+3. Check Hermes gateway logs for Twilio API errors
+
+### Webhook port conflicts
+
+If port 8080 is already in use, change it:
+
+```bash
+SMS_WEBHOOK_PORT=3001
+```
+
+Update the webhook URL in Twilio Console to match.