feat(reminders): add generic webhook as a fourth reminder channel (#2952)

Replaces any Discord-specific reminder channel with a generic outbound
webhook channel. Users pick any saved Integration as the target and
supply a JSON payload template with {{title}} and {{message}}
placeholders — values are JSON-escaped before substitution. Works with
Discord, Slack, Teams, ntfy (JSON mode), or any service that accepts a
POST with a JSON body.

- `src/settings.py` — reminder_webhook_integration_id +
  reminder_webhook_payload_template defaults
- `routes/note_routes.py` — webhook delivery block; Integration lookup,
  template rendering, auth wiring; built-in preset defaults so
  discord_webhook works out of the box without a configured template;
  settings_override kwarg avoids test-button race condition
- `routes/auth_routes.py` — discord_webhook preset test handler
- `src/integrations.py` — discord_webhook preset with description +
  example templates; hides auth/key fields in the Integration form
- `src/builtin_actions.py` — webhook_sent delivery check
- `src/tool_implementations.py` — webhook aliases + enum updated
- `static/index.html` — Webhook channel option; Integration picker +
  payload template textarea
- `static/js/settings.js` — Integration list, populateWebhookIntegrations,
  syncChannelRows, hints, load/save, auto-fill preset templates,
  test-button override payload, hide auth/key for URL-auth presets

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

routes/auth_routes.py

@@ -585,6 +585,27 @@ def setup_auth_routes(auth_manager: AuthManager) -> APIRouter:
                     hint = " If this is Docker Compose ntfy, set NTFY_BIND to that host/Tailscale IP and NTFY_BASE_URL to the same server URL in .env, then recreate ntfy."
                 return {"ok": False, "message": f"ntfy publish to {full_url} failed: {e}.{hint}"[:500]}
 
+        if preset == "discord_webhook":
+            import httpx
+            webhook_url = (integ.get("base_url") or "").strip()
+            if not webhook_url:
+                return {"ok": False, "message": "No webhook URL set — paste the full Discord webhook URL into the Base URL field."}
+            payload = {
+                "embeds": [{
+                    "title": "Odysseus connectivity test",
+                    "description": "If you see this, your Discord Webhook integration is wired up correctly.",
+                    "color": 5793266,
+                }]
+            }
+            try:
+                async with httpx.AsyncClient(timeout=8.0) as client:
+                    r = await client.post(webhook_url, json=payload)
+                if r.is_success:
+                    return {"ok": True, "message": "Test embed sent — check your Discord channel to confirm it arrived."}
+                return {"ok": False, "message": f"Discord returned HTTP {r.status_code}: {r.text[:200]}"}
+            except Exception as e:
+                return {"ok": False, "message": f"Request failed: {e}"[:400]}
+
         # All other presets: GET against a known health endpoint.
         # Fall back to detecting from name if preset is missing.
         health_paths = {

routes/note_routes.py

@@ -114,8 +114,9 @@ async def dispatch_reminder(
     note_id: str,
     owner: str = "",
     queue_browser: bool = True,
+    settings_override: dict | None = None,
 ) -> dict:
-    """Fire a reminder via the configured channel (browser/email/ntfy).
+    """Fire a reminder via the configured channel (browser/email/ntfy/webhook).
 
     Args:
         title: short headline shown to the user
@@ -129,7 +130,7 @@ async def dispatch_reminder(
     nothing is "sent" synchronously for it — the channel just routes there.
     """
     from src.settings import load_settings
-    settings = load_settings()
+    settings = {**load_settings(), **(settings_override or {})}
     channel = settings.get("reminder_channel", "browser")
     llm_on = bool(settings.get("reminder_llm_synthesis", False))
     title = (title or "").strip()
@@ -160,13 +161,14 @@ async def dispatch_reminder(
                 # Treat those as browser-only dedupe so email reminders can be
                 # retried by the backend scanner after a failed frontend path.
                 should_skip = last_dt >= _dt.now(_tz.utc) - _td(minutes=25)
-                if should_skip and channel in ("email", "ntfy"):
+                if should_skip and channel in ("email", "ntfy", "webhook"):
                     should_skip = last_channel == channel
                 if should_skip:
                     return {
                         "synthesis": None,
                         "email_sent": False,
                         "ntfy_sent": False,
+                        "webhook_sent": False,
                         "browser_sent": True,
                         "skipped": True,
                     }
@@ -360,6 +362,76 @@ async def dispatch_reminder(
             email_error = str(e) or e.__class__.__name__
             logger.warning(f"Reminder email send failed: {e}")
 
+    webhook_sent = False
+    webhook_error = ""
+    if channel == "webhook":
+        try:
+            import httpx
+            import json as _wjson
+            from src.integrations import load_integrations
+            # Built-in payload defaults for known presets so users don't have
+            # to configure a template just to use a standard service.
+            _PRESET_TEMPLATE_DEFAULTS = {
+                "discord_webhook": '{"embeds": [{"title": "{{title}}", "description": "{{message}}", "color": 5793266}]}',
+            }
+            intg_id = settings.get("reminder_webhook_integration_id", "").strip()
+            template = settings.get("reminder_webhook_payload_template", "").strip()
+            if not intg_id:
+                webhook_error = "No webhook integration selected"
+            else:
+                intg = next(
+                    (i for i in load_integrations()
+                     if i.get("id") == intg_id and i.get("base_url")),
+                    None,
+                )
+                if not intg:
+                    webhook_error = f"Integration {intg_id!r} not found or missing base URL"
+                else:
+                    # Fall back to a built-in default for known presets so
+                    # users don't have to configure a template for standard
+                    # services like Discord.
+                    if not template:
+                        template = _PRESET_TEMPLATE_DEFAULTS.get(intg.get("preset", ""), "")
+                    if not template:
+                        webhook_error = "No payload template configured"
+                    else:
+                        # Render template: JSON-escape the values so the result
+                        # is always valid JSON regardless of special characters.
+                        # dumps() returns `"value"` — strip outer quotes.
+                        msg = (synthesis or note_body or title or "Reminder")[:4000]
+                        _t = _wjson.dumps(title or "Reminder")[1:-1]
+                        _m = _wjson.dumps(msg)[1:-1]
+                        rendered = template.replace("{{title}}", _t).replace("{{message}}", _m)
+                        hdrs = {"Content-Type": "application/json"}
+                        api_key = intg.get("api_key", "")
+                        auth_type = (intg.get("auth_type") or "none").lower()
+                        if api_key:
+                            if auth_type == "bearer":
+                                hdrs["Authorization"] = f"Bearer {api_key}"
+                            elif auth_type == "header":
+                                hdrs[intg.get("auth_header") or "Authorization"] = api_key
+                        url = intg["base_url"].rstrip("/")
+                        # SSRF guard — matches the pattern used by webhook_routes,
+                        # CalDAV, search, and embeddings. Blocks link-local / metadata
+                        # addresses (169.254.x.x) by default; set
+                        # REMINDER_WEBHOOK_BLOCK_PRIVATE_IPS=true to also block
+                        # RFC-1918 ranges for locked-down deployments.
+                        import os as _os
+                        from src.url_safety import check_outbound_url as _chk
+                        _block = _os.getenv("REMINDER_WEBHOOK_BLOCK_PRIVATE_IPS", "false").lower() == "true"
+                        _ok, _reason = _chk(url, block_private=_block)
+                        if not _ok:
+                            webhook_error = f"Webhook URL rejected: {_reason}"
+                        else:
+                            async with httpx.AsyncClient(timeout=10.0) as client:
+                                resp = await client.post(url, content=rendered.encode(), headers=hdrs)
+                                webhook_sent = resp.is_success
+                                if not webhook_sent:
+                                    webhook_error = f"Webhook returned HTTP {resp.status_code}"
+        except Exception as e:
+            webhook_error = str(e) or e.__class__.__name__
+            logger.warning(f"Reminder webhook send failed: {e}")
+
     ntfy_sent = False
     ntfy_error = ""
     if channel == "ntfy":
@@ -415,7 +487,7 @@ async def dispatch_reminder(
     # second send for the same note within 25 min. Without this, a note
     # whose due_date fires while the user has the app open got TWO emails
     # (frontend-fired here + background-fired by ping_notes 0–5 min later).
-    if (email_sent or ntfy_sent or browser_sent or local_browser_sent) and note_id:
+    if (email_sent or ntfy_sent or webhook_sent or browser_sent or local_browser_sent) and note_id:
         try:
             import json as _json
             from datetime import datetime as _dt, timezone as _tz
@@ -431,7 +503,7 @@ async def dispatch_reminder(
                 _cache = cache or (_json.loads(_STATE.read_text(encoding="utf-8")) if _STATE.exists() else {})
             except Exception:
                 _cache = {}
-            sent_channel = "email" if email_sent else "ntfy" if ntfy_sent else "browser"
+            sent_channel = "email" if email_sent else "ntfy" if ntfy_sent else "webhook" if webhook_sent else "browser"
             _cache[cache_key or str(note_id)] = {
                 "at": _dt.now(_tz.utc).isoformat(),
                 "channel": sent_channel,
@@ -441,11 +513,14 @@ async def dispatch_reminder(
             logger.debug(f"dispatch_reminder: cache write failed: {_e}")
 
     return {
+        "channel": channel,
         "synthesis": synthesis,
         "email_sent": email_sent,
         "email_error": email_error,
         "ntfy_sent": ntfy_sent,
         "ntfy_error": ntfy_error,
+        "webhook_sent": webhook_sent,
+        "webhook_error": webhook_error,
         "browser_sent": browser_sent or local_browser_sent,
     }
 
@@ -692,12 +767,21 @@ def setup_note_routes(task_scheduler=None):
         if not note_id:
             raise HTTPException(400, "note_id required")
 
-        # Delegate to the module-level helper so background tasks can reuse
-        # the same dispatch without an HTTP roundtrip + auth cookie.
+        # Optional overrides let the test button pass the current UI values
+        # directly so the test never races against a pending settings save.
+        _override: dict = {}
+        if body.get("channel"):
+            _override["reminder_channel"] = body["channel"]
+        if body.get("webhook_integration_id"):
+            _override["reminder_webhook_integration_id"] = body["webhook_integration_id"]
+        if body.get("webhook_payload_template"):
+            _override["reminder_webhook_payload_template"] = body["webhook_payload_template"]
+
         return await dispatch_reminder(
             title=title, note_body=note_body, note_id=note_id,
             owner=_owner(request) or "",
             queue_browser=False,
+            settings_override=_override or None,
         )
 
     # --- REORDER NOTES ---

src/builtin_actions.py

@@ -1902,6 +1902,8 @@ async def action_check_email_urgency(owner: str, **kwargs) -> Tuple[str, bool]:
                     delivered = bool(dispatch_result.get("email_sent"))
                 elif channel == "ntfy":
                     delivered = bool(dispatch_result.get("ntfy_sent"))
+                elif channel == "webhook":
+                    delivered = bool(dispatch_result.get("webhook_sent"))
                 if delivered:
                     newly_notified.update(new_urgent)
                 else:

src/integrations.py

@@ -100,6 +100,19 @@ INTEGRATION_PRESETS: Dict[str, Dict[str, Any]] = {
             "  GET /{topic}/json?poll=1 — poll for messages"
         ),
     },
+    "discord_webhook": {
+        "name": "Discord Webhook",
+        "auth_type": "none",
+        "description": (
+            "Discord Incoming Webhook. Paste the full webhook URL (including the token) as the Base URL.\n"
+            "To get a URL: Discord server -> Server Settings -> Integrations -> Webhooks -> New Webhook -> Copy Webhook URL.\n"
+            "The secret is embedded in the URL — leave auth type as None.\n\n"
+            "Use this integration as the target in Settings -> Reminders -> Webhook channel.\n"
+            "Payload template examples:\n"
+            "  Simple:  {\"content\": \"{{title}}: {{message}}\"}\n"
+            "  Embed:   {\"embeds\": [{\"title\": \"{{title}}\", \"description\": \"{{message}}\", \"color\": 5793266}]}"
+        ),
+    },
     "vaultwarden": {
         "name": "Vaultwarden",
         "auth_type": "header",

src/settings.py

@@ -141,10 +141,17 @@ DEFAULT_SETTINGS = {
     # library can grow beyond this; cleanup/retirement is an explicit review flow.
     "skill_max_injected": 3,
     # Reminders
-    "reminder_channel": "browser",   # "browser" | "email" | "ntfy"
+    "reminder_channel": "browser",   # "browser" | "email" | "ntfy" | "webhook"
     "reminder_llm_synthesis": False,
     "reminder_ntfy_topic": "Reminders",
     "reminder_email_to": "",
+    # Generic outbound webhook channel: pick any saved Integration as the
+    # target and supply a JSON payload template. Use {{title}} and {{message}}
+    # as placeholders — they are JSON-escaped before substitution, so the
+    # rendered string is always valid JSON. Works with Discord, Slack, Teams,
+    # ntfy (JSON mode), or any service that accepts a POST with a JSON body.
+    "reminder_webhook_integration_id": "",
+    "reminder_webhook_payload_template": "",
     # Email triage scanner rules. Running/paused state and schedule live in
     # Tasks via the built-in `check_email_urgency` task.
     "urgent_email_prompt": (

src/tool_implementations.py

@@ -1566,6 +1566,8 @@ async def do_manage_settings(content: str, owner: Optional[str] = None) -> Dict:
             "image gen": "image_gen_enabled", "image generation": "image_gen_enabled",
             "reminder channel": "reminder_channel", "reminders": "reminder_channel",
             "ntfy topic": "reminder_ntfy_topic",
+            "webhook integration": "reminder_webhook_integration_id",
+            "webhook template": "reminder_webhook_payload_template", "webhook payload": "reminder_webhook_payload_template",
             "agent tool calls": "agent_max_tool_calls", "max tool calls": "agent_max_tool_calls",
             "agent timeout": "agent_stream_timeout_seconds", "stream timeout": "agent_stream_timeout_seconds",
             "token budget": "agent_input_token_budget", "input budget": "agent_input_token_budget",
@@ -1581,7 +1583,7 @@ async def do_manage_settings(content: str, owner: Optional[str] = None) -> Dict:
 
         _ENUMS = {
             "image_quality": ["low", "medium", "high"],
-            "reminder_channel": ["browser", "email", "ntfy"],
+            "reminder_channel": ["browser", "email", "ntfy", "webhook"],
         }
         def _coerce(value, default):
             if isinstance(default, bool):

static/index.html

@@ -1957,6 +1957,7 @@
                   <option value="browser">Browser notification (default)</option>
                   <option value="email" id="set-reminder-channel-email-opt">Email</option>
                   <option value="ntfy" id="set-reminder-channel-ntfy-opt">ntfy</option>
+                  <option value="webhook" id="set-reminder-channel-webhook-opt">Webhook</option>
                 </select>
               </div>
               <div id="set-reminder-email-from-row" class="settings-row" style="display:none">
@@ -1971,13 +1972,21 @@
                 <label class="settings-label">ntfy topic</label>
                 <input id="set-reminder-ntfy-topic" class="settings-select" type="text" placeholder="reminders" />
               </div>
+              <div id="set-reminder-webhook-intg-row" class="settings-row" style="display:none">
+                <label class="settings-label">Integration</label>
+                <select id="set-reminder-webhook-intg" class="settings-select"></select>
+              </div>
+              <div id="set-reminder-webhook-template-row" class="settings-row" style="display:none;align-items:flex-start">
+                <label class="settings-label" style="padding-top:6px">Payload</label>
+                <textarea id="set-reminder-webhook-template" class="settings-select" rows="3" style="font-family:inherit;resize:vertical;flex:1" placeholder='{"content": "{{title}}: {{message}}"}'></textarea>
+              </div>
               <div id="set-reminder-channel-hint" style="font-size:11px;opacity:0.6;"></div>
               <div style="font-size:11px;opacity:0.6;margin-top:4px;">Configure email account, ntfy server, etc. in <a href="#" id="set-reminders-open-integrations" style="color:var(--accent, var(--red));text-decoration:none;font-weight:600;">Integrations</a>.</div>
             </div>
           </div>
           <div class="admin-card">
             <h2 style="display:flex;align-items:center;gap:6px;"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="margin-right:1px;opacity:0.6;flex-shrink:0"><path d="M12 0L14.59 8.41L23 12L14.59 15.59L12 24L9.41 15.59L1 12L9.41 8.41Z"/></svg>AI Synthesis<span style="flex:1"></span><label class="admin-switch" title="Use the utility model to write reminder messages"><input type="checkbox" id="set-reminder-llm-toggle"><span class="admin-slider"></span></label></h2>
-            <div class="admin-toggle-sub" style="margin-bottom:8px">When on, the utility model writes a short, warm one-line reminder for browser, email, AND ntfy reminders instead of just the raw note content.</div>
+            <div class="admin-toggle-sub" style="margin-bottom:8px">When on, the utility model writes a short, warm one-line reminder for browser, email, ntfy, AND webhook reminders instead of just the raw note content.</div>
           </div>
           <div class="admin-card">
             <h2><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="vertical-align:-2px;margin-right:5px;opacity:0.6"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"/><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"/></svg>Public App URL</h2>

static/js/settings.js

@@ -2244,6 +2244,7 @@ async function initReminderSettings() {
   const channelSel = el('set-reminder-channel');
   const emailOpt = el('set-reminder-channel-email-opt');
   const ntfyOpt = el('set-reminder-channel-ntfy-opt');
+  const webhookOpt = el('set-reminder-channel-webhook-opt');
   const hint = el('set-reminder-channel-hint');
   const llmToggle = el('set-reminder-llm-toggle');
   // "Integrations" link in the channel-hint copy. Jumps to the
@@ -2306,12 +2307,33 @@ async function initReminderSettings() {
     ntfyOpt.textContent = 'ntfy (add in Integrations first)';
   }
 
+  // Webhook: available whenever at least one integration with a base_url exists.
+  // The user picks which integration to target and supplies a payload template.
+  let allIntegrations = [];
+  let webhookConfigured = false;
+  try {
+    const res = await fetch('/api/auth/integrations', { credentials: 'same-origin' });
+    if (res.ok) {
+      const data = await res.json();
+      allIntegrations = (data.integrations || []).filter(i => i.base_url && i.enabled !== false);
+      webhookConfigured = allIntegrations.length > 0;
+    }
+  } catch (_) {}
+  if (!webhookConfigured && webhookOpt) {
+    webhookOpt.disabled = true;
+    webhookOpt.textContent = 'Webhook (add an Integration first)';
+  }
+
   const emailFromRow = el('set-reminder-email-from-row');
   const emailAcctSel = el('set-reminder-email-account');
   const emailToRow = el('set-reminder-email-to-row');
   const emailToIn = el('set-reminder-email-to');
   const ntfyTopicRow = el('set-reminder-ntfy-topic-row');
   const ntfyTopicIn = el('set-reminder-ntfy-topic');
+  const webhookIntgRow = el('set-reminder-webhook-intg-row');
+  const webhookIntgSel = el('set-reminder-webhook-intg');
+  const webhookTemplateRow = el('set-reminder-webhook-template-row');
+  const webhookTemplateIn = el('set-reminder-webhook-template');
 
   function populateReminderEmailAccounts(selectedId = '') {
     if (!emailAcctSel) return;
@@ -2322,6 +2344,14 @@ async function initReminderSettings() {
     emailAcctSel.value = (selectedId && emailAccounts.some(a => a.id === selectedId)) ? selectedId : fallback;
   }
 
+  function populateWebhookIntegrations(selectedId = '') {
+    if (!webhookIntgSel) return;
+    webhookIntgSel.innerHTML = allIntegrations.length
+      ? allIntegrations.map(i => `<option value="${esc(i.id)}">${esc(i.name || i.id)}</option>`).join('')
+      : '<option value="">No integrations configured</option>';
+    if (selectedId && allIntegrations.some(i => i.id === selectedId)) webhookIntgSel.value = selectedId;
+  }
+
   function applyReminderChannelAvailability() {
     if (emailOpt) {
       emailOpt.disabled = !smtpConfigured;
@@ -2331,11 +2361,16 @@ async function initReminderSettings() {
       ntfyOpt.disabled = !ntfyConfigured;
       ntfyOpt.textContent = ntfyConfigured ? 'ntfy' : 'ntfy (add in Integrations first)';
     }
+    if (webhookOpt) {
+      webhookOpt.disabled = !webhookConfigured;
+      webhookOpt.textContent = webhookConfigured ? 'Webhook' : 'Webhook (add an Integration first)';
+    }
   }
 
   async function refreshReminderChannelAvailability() {
     const currentChannel = channelSel.value || 'browser';
     const currentEmailAccount = emailAcctSel?.value || '';
+    const currentWebhookIntg = webhookIntgSel?.value || '';
     try {
       const res = await fetch('/api/email/accounts', { credentials: 'same-origin' });
       if (res.ok) {
@@ -2353,6 +2388,8 @@ async function initReminderSettings() {
         ntfyConfigured = (data.integrations || []).some(
           i => (i.preset === 'ntfy' || (i.name || '').toLowerCase() === 'ntfy') && i.enabled !== false && i.base_url
         );
+        allIntegrations = (data.integrations || []).filter(i => i.base_url && i.enabled !== false);
+        webhookConfigured = allIntegrations.length > 0;
       }
     } catch (_) {}
     if (!ntfyConfigured) {
@@ -2365,8 +2402,10 @@ async function initReminderSettings() {
 
     applyReminderChannelAvailability();
     populateReminderEmailAccounts(currentEmailAccount);
+    populateWebhookIntegrations(currentWebhookIntg);
     if (currentChannel === 'email' && !smtpConfigured) channelSel.value = 'browser';
     else if (currentChannel === 'ntfy' && !ntfyConfigured) channelSel.value = 'browser';
+    else if (currentChannel === 'webhook' && !webhookConfigured) channelSel.value = 'browser';
     else channelSel.value = currentChannel;
     if (hint) hint.textContent = CHANNEL_HINTS[channelSel.value] || '';
     syncChannelRows();
@@ -2377,9 +2416,12 @@ async function initReminderSettings() {
 
   function syncChannelRows() {
     const isEmail = channelSel.value === 'email';
+    const isWebhook = channelSel.value === 'webhook';
     if (emailFromRow) emailFromRow.style.display = (isEmail && emailAccounts.length > 1) ? 'flex' : 'none';
     if (emailToRow) emailToRow.style.display = isEmail ? 'flex' : 'none';
     if (ntfyTopicRow) ntfyTopicRow.style.display = channelSel.value === 'ntfy' ? 'flex' : 'none';
+    if (webhookIntgRow) webhookIntgRow.style.display = isWebhook ? 'flex' : 'none';
+    if (webhookTemplateRow) webhookTemplateRow.style.display = isWebhook ? 'flex' : 'none';
   }
 
   // Browser notifications fire on EVERY reminder (see
@@ -2390,6 +2432,7 @@ async function initReminderSettings() {
     browser: 'Reminders appear as browser notifications inside Odysseus.',
     email: 'Reminders are emailed AND shown as a browser notification.',
     ntfy: 'Reminders are pushed via ntfy AND shown as a browser notification.',
+    webhook: 'Reminders are POSTed to the selected integration AND shown as a browser notification. Use {{title}} and {{message}} in the payload template.',
   };
 
   applyReminderChannelAvailability();
@@ -2400,16 +2443,36 @@ async function initReminderSettings() {
     });
   }
 
+  // Default payload templates for known presets — auto-filled when the user
+  // picks a matching integration so they don't have to write JSON from scratch.
+  // Defined here (before the load block) so both the load path and the change
+  // handler can reference it.
+  const WEBHOOK_PRESET_TEMPLATES = {
+    discord_webhook: '{"embeds": [{"title": "{{title}}", "description": "{{message}}", "color": 5793266}]}',
+  };
+
   try {
     const res = await fetch('/api/auth/settings', { credentials: 'same-origin' });
     const s = await res.json();
     let savedChannel = s.reminder_channel || 'browser';
     if (savedChannel === 'email' && !smtpConfigured) savedChannel = 'browser';
     if (savedChannel === 'ntfy' && !ntfyConfigured) savedChannel = 'browser';
+    if (savedChannel === 'webhook' && !webhookConfigured) savedChannel = 'browser';
     channelSel.value = savedChannel;
     llmToggle.checked = !!s.reminder_llm_synthesis;
     if (emailToIn) emailToIn.value = s.reminder_email_to || '';
     if (ntfyTopicIn) ntfyTopicIn.value = s.reminder_ntfy_topic || 'Reminders';
+    populateWebhookIntegrations(s.reminder_webhook_integration_id || '');
+    if (webhookTemplateIn) {
+      webhookTemplateIn.value = s.reminder_webhook_payload_template || '';
+      // If an integration is already selected but no template was ever saved,
+      // auto-fill with the preset default so the first test works out of the box.
+      if (!webhookTemplateIn.value && webhookIntgSel?.value) {
+        const intg = allIntegrations.find(i => i.id === webhookIntgSel.value);
+        const tpl = WEBHOOK_PRESET_TEMPLATES[intg?.preset] || '';
+        if (tpl) { webhookTemplateIn.value = tpl; save({ reminder_webhook_payload_template: tpl }); }
+      }
+    }
     // Restore the previously-picked email account (if any), otherwise
     // default to the account flagged is_default in the integrations
     // list. Falls through to the first option if neither exists.
@@ -2459,6 +2522,28 @@ async function initReminderSettings() {
       topicDebounce = setTimeout(() => save({ reminder_ntfy_topic: ntfyTopicIn.value.trim() || 'reminders' }), 600);
     });
   }
+  if (webhookIntgSel) {
+    webhookIntgSel.addEventListener('change', () => {
+      save({ reminder_webhook_integration_id: webhookIntgSel.value || '' });
+      // If the template is empty and we recognise the integration's preset,
+      // pre-fill with a sensible default so users can test immediately.
+      if (webhookTemplateIn && !webhookTemplateIn.value.trim()) {
+        const intg = allIntegrations.find(i => i.id === webhookIntgSel.value);
+        const tpl = WEBHOOK_PRESET_TEMPLATES[intg?.preset] || '';
+        if (tpl) {
+          webhookTemplateIn.value = tpl;
+          save({ reminder_webhook_payload_template: tpl });
+        }
+      }
+    });
+  }
+  if (webhookTemplateIn) {
+    let templateDebounce;
+    webhookTemplateIn.addEventListener('input', () => {
+      clearTimeout(templateDebounce);
+      templateDebounce = setTimeout(() => save({ reminder_webhook_payload_template: webhookTemplateIn.value.trim() }), 600);
+    });
+  }
   // Dim the whole AI Synthesis card when off (matches Vision/Utility/etc.).
   function syncSynthesisDim() {
     const card = llmToggle.closest('.admin-card');
@@ -2495,6 +2580,11 @@ async function initReminderSettings() {
             note_id: 'test-' + Date.now(),
             title: 'Test Reminder',
             body: 'This is a test reminder to verify your settings are working.',
+            channel: channelSel.value,
+            ...(channelSel.value === 'webhook' ? {
+              webhook_integration_id: webhookIntgSel?.value || '',
+              webhook_payload_template: webhookTemplateIn?.value.trim() || '',
+            } : {}),
           }),
         });
         const data = await res.json();
@@ -2505,10 +2595,15 @@ async function initReminderSettings() {
         if (channelSel.value === 'ntfy' && !data.ntfy_sent) {
           throw new Error(data.ntfy_error || 'ntfy reminder was not sent');
         }
+        if (channelSel.value === 'webhook' && !data.webhook_sent) {
+          const activeChannel = data.channel ? ` (server used channel: "${data.channel}")` : '';
+          throw new Error((data.webhook_error || 'Webhook reminder was not sent') + activeChannel);
+        }
         let status = 'Delivered via ' + channelSel.value;
         if (data.synthesis) status += ' (AI: "' + data.synthesis.slice(0, 60) + '...")';
         if (data.email_sent) status += ' — email sent';
         if (data.ntfy_sent) status += ' — ntfy sent';
+        if (data.webhook_sent) status += ' — webhook sent';
         if (testMsg) { testMsg.textContent = status; testMsg.style.color = 'var(--green, #50fa7b)'; }
         // Also fire a browser notification so user can see it
         if ('Notification' in window && Notification.permission === 'granted') {
@@ -2932,12 +3027,18 @@ async function initIntegrations() {
   let editingId = null;
   let presets = {};
 
-  // Toggle auth header row visibility
+  // Presets where the secret is embedded in the URL — no separate key or
+  // auth header is used, so hiding those fields avoids confusion.
+  const URL_AUTH_PRESETS = ['discord_webhook'];
+
+  // Toggle auth header + key row visibility based on auth type and preset.
   function syncAuthRow() {
     const v = authTypeSel.value;
     authHeaderRow.style.display = (v === 'header' || v === 'query') ? 'flex' : 'none';
     if (v === 'query') authHeaderIn.placeholder = 'api_key';
     else authHeaderIn.placeholder = 'X-Auth-Token';
+    const keyRow = keyIn?.closest('.settings-row');
+    if (keyRow) keyRow.style.display = URL_AUTH_PRESETS.includes(presetSel?.value) ? 'none' : '';
   }
   authTypeSel.addEventListener('change', syncAuthRow);
 
@@ -3487,6 +3588,7 @@ async function initUnifiedIntegrations() {
     const _applyPreset = () => {
       const p = presets[preset.value];
       const isNtfy = preset.value === 'ntfy' || (p && (p.name || '').toLowerCase() === 'ntfy');
+      const isUrlAuth = preset.value === 'discord_webhook'; // secret embedded in URL — no key/auth fields needed
       if (ntfyHint) {
         ntfyHint.style.display = isNtfy ? 'block' : 'none';
         if (isNtfy) {
@@ -3494,8 +3596,16 @@ async function initUnifiedIntegrations() {
         }
       }
       if (url) {
-        url.placeholder = isNtfy ? 'http://127.0.0.1:8091' : 'http://localhost:8080';
+        url.placeholder = isNtfy ? 'http://127.0.0.1:8091' : isUrlAuth ? 'https://discord.com/api/webhooks/...' : 'http://localhost:8080';
       }
+      // For presets that embed the secret in the URL, hide auth/key/header rows
+      // so users aren't confused into thinking they need to fill them in.
+      const keyRow = key?.closest('.settings-row');
+      const authRow = auth?.closest('.settings-row');
+      const headerRow = el('uf-api-header-row');
+      if (keyRow) keyRow.style.display = isUrlAuth ? 'none' : '';
+      if (authRow) authRow.style.display = isUrlAuth ? 'none' : '';
+      if (headerRow) headerRow.style.display = isUrlAuth ? 'none' : '';
       if (!p) return;
       name.value = p.name || '';
       auth.value = p.auth_type || 'none';