diff --git a/scripts/bazarr_init.py b/scripts/bazarr_init.py
new file mode 100644
index 0000000..b8d984c
--- /dev/null
+++ b/scripts/bazarr_init.py
@@ -0,0 +1,102 @@
+#!/usr/bin/env python3
+"""Declarative API initialization for Bazarr provider connections.
+
+Idempotently configures Sonarr and Radarr providers in Bazarr via its
+settings API.  Detects stale API keys and updates them.
+"""
+
+import os
+
+import requests as http
+
+from common import (
+    load_config,
+    read_api_key_xml,
+    read_api_key_yaml,
+    wait_for_api,
+)
+
+
+def configure_provider(base_url, api_key, provider_type, provider_config):
+    """Idempotently configure a Sonarr/Radarr provider in Bazarr.
+
+    Compares the stored API key against the current one and updates if stale.
+    """
+    ltype = provider_type.lower()
+    print(f"Checking {provider_type} provider...")
+
+    resp = http.get(
+        f"{base_url}/api/system/settings",
+        headers={"X-API-KEY": api_key},
+        timeout=30,
+    )
+    resp.raise_for_status()
+    settings = resp.json()
+
+    use_flag = settings.get("general", {}).get(f"use_{ltype}", False)
+    existing_key = settings.get(ltype, {}).get("apikey", "")
+
+    provider_api_key = read_api_key_xml(
+        f"{provider_config['dataDir']}/config.xml"
+    )
+    bind_address = provider_config.get("bindAddress", "127.0.0.1")
+
+    if use_flag and existing_key == provider_api_key:
+        print(f"{provider_type} provider already correct, skipping")
+        return
+
+    action = "Updating" if use_flag else "Adding"
+    print(f"{action} {provider_type} provider...")
+
+    resp = http.post(
+        f"{base_url}/api/system/settings",
+        headers={"X-API-KEY": api_key},
+        data={
+            f"settings-general-use_{ltype}": "true",
+            f"settings-{ltype}-ip": bind_address,
+            f"settings-{ltype}-port": str(provider_config["port"]),
+            f"settings-{ltype}-apikey": provider_api_key,
+            f"settings-{ltype}-ssl": "false",
+            f"settings-{ltype}-base_url": "/",
+        },
+        timeout=30,
+    )
+    resp.raise_for_status()
+    print(f"{provider_type} provider configured")
+
+
+def main():
+    cfg = load_config()
+    data_dir = cfg["dataDir"]
+    bind_address = cfg.get("bindAddress", "127.0.0.1")
+    port = cfg["port"]
+    api_timeout = cfg["apiTimeout"]
+
+    config_yaml = f"{data_dir}/config/config.yaml"
+    if not os.path.isfile(config_yaml):
+        print(f"Config file {config_yaml} not found, skipping bazarr init")
+        return
+
+    api_key = read_api_key_yaml(config_yaml)
+    base_url = f"http://{bind_address}:{port}"
+
+    wait_for_api(
+        base_url,
+        api_key,
+        api_timeout,
+        "Bazarr",
+        header_name="X-API-KEY",
+        status_path="/api/system/status",
+    )
+
+    providers = cfg.get("providers", {})
+    if providers.get("sonarr", {}).get("enable"):
+        configure_provider(base_url, api_key, "Sonarr", providers["sonarr"])
+    if providers.get("radarr", {}).get("enable"):
+        configure_provider(base_url, api_key, "Radarr", providers["radarr"])
+
+    print("Bazarr init complete")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/scripts/common.py b/scripts/common.py
new file mode 100644
index 0000000..58643ca
--- /dev/null
+++ b/scripts/common.py
@@ -0,0 +1,140 @@
+"""Shared utilities for arr-init scripts."""
+
+import json
+import sys
+import time
+import xml.etree.ElementTree as ET
+
+import requests as http
+import yaml
+
+
+def load_config():
+    """Load JSON configuration from the path given as the first CLI argument."""
+    if len(sys.argv) < 2:
+        print("Usage: script <config.json>", file=sys.stderr)
+        sys.exit(1)
+    with open(sys.argv[1]) as f:
+        return json.load(f)
+
+
+def read_api_key_xml(config_xml_path):
+    """Extract <ApiKey> from a Servarr config.xml file."""
+    tree = ET.parse(config_xml_path)
+    node = tree.find("ApiKey")
+    if node is None or not node.text:
+        raise ValueError(f"Could not find ApiKey in {config_xml_path}")
+    return node.text
+
+
+def read_api_key_yaml(config_yaml_path):
+    """Extract the apikey from Bazarr's config.yaml (auth section)."""
+    with open(config_yaml_path) as fh:
+        data = yaml.safe_load(fh)
+    try:
+        return data["auth"]["apikey"]
+    except (KeyError, TypeError) as exc:
+        raise ValueError(
+            f"Could not find auth.apikey in {config_yaml_path}"
+        ) from exc
+
+
+def wait_for_api(
+    base_url,
+    api_key,
+    timeout,
+    name,
+    *,
+    header_name="X-Api-Key",
+    status_path="/system/status",
+):
+    """Poll a status endpoint until the API responds or timeout.
+
+    Args:
+        base_url: Base URL including any API version prefix.
+        api_key: API key for authentication.
+        timeout: Maximum seconds to wait.
+        name: Human-readable service name for log messages.
+        header_name: HTTP header name for the API key.
+        status_path: Path appended to base_url for the health probe.
+    """
+    print(f"Waiting for {name} API (timeout: {timeout}s)...")
+    for i in range(1, timeout + 1):
+        try:
+            resp = http.get(
+                f"{base_url}{status_path}",
+                headers={header_name: api_key},
+                timeout=5,
+            )
+            if resp.ok:
+                print(f"{name} API is ready")
+                return
+        except (http.ConnectionError, http.Timeout):
+            pass
+        if i == timeout:
+            print(
+                f"{name} API not available after {timeout} seconds",
+                file=sys.stderr,
+            )
+            sys.exit(1)
+        time.sleep(1)
+
+
+def health_check_loop(url, api_key, entity_name, svc_name, max_retries, interval):
+    """POST to a testall endpoint with retry logic.
+
+    Exits the process on permanent failure so the systemd unit reflects the error.
+    """
+    attempt = 0
+    while True:
+        healthy = True
+        last_error = ""
+        try:
+            resp = http.post(
+                url,
+                headers={
+                    "X-Api-Key": api_key,
+                    "Content-Type": "application/json",
+                },
+                timeout=30,
+            )
+            result = resp.json()
+            failures = [
+                item for item in result if not item.get("isValid", True)
+            ]
+            if failures:
+                healthy = False
+                last_error = "\n".join(
+                    f"  - ID {f['id']}: "
+                    + ", ".join(
+                        v["errorMessage"]
+                        for v in f.get("validationFailures", [])
+                    )
+                    for f in failures
+                )
+        except (http.RequestException, ValueError, KeyError) as exc:
+            healthy = False
+            last_error = (
+                f"could not reach {svc_name} API for {entity_name} test: {exc}"
+            )
+
+        if healthy:
+            print(f"All {entity_name}s healthy")
+            return
+
+        attempt += 1
+        if attempt > max_retries:
+            print(
+                f"Health check FAILED after {attempt} attempts: "
+                f"{entity_name}(s) unreachable:",
+                file=sys.stderr,
+            )
+            print(last_error, file=sys.stderr)
+            sys.exit(1)
+
+        print(
+            f"{entity_name.capitalize()} health check failed "
+            f"(attempt {attempt}/{max_retries}), "
+            f"retrying in {interval}s..."
+        )
+        time.sleep(interval)
diff --git a/scripts/jellyseerr_init.py b/scripts/jellyseerr_init.py
new file mode 100644
index 0000000..6a33234
--- /dev/null
+++ b/scripts/jellyseerr_init.py
@@ -0,0 +1,139 @@
+#!/usr/bin/env python3
+"""Declarative quality profile initialization for Jellyseerr.
+
+Resolves profile names to IDs by querying Radarr/Sonarr APIs, then patches
+Jellyseerr's settings.json so new requests default to the correct quality
+profiles.
+"""
+
+import json
+import os
+import subprocess
+import sys
+
+import requests as http
+
+from common import load_config, read_api_key_xml, wait_for_api
+
+
+def resolve_profile_id(base_url, api_key, profile_name, app_name):
+    """Query a Servarr app for quality profiles and resolve a name to an ID."""
+    resp = http.get(
+        f"{base_url}/qualityprofile",
+        headers={"X-Api-Key": api_key},
+        timeout=30,
+    )
+    resp.raise_for_status()
+    profiles = resp.json()
+
+    for profile in profiles:
+        if profile["name"] == profile_name:
+            print(f"Resolved {app_name} profile '{profile_name}' -> ID {profile['id']}")
+            return profile["id"]
+
+    available = [p["name"] for p in profiles]
+    print(
+        f"Profile '{profile_name}' not found in {app_name}. "
+        f"Available: {available}",
+        file=sys.stderr,
+    )
+    sys.exit(1)
+
+
+def main():
+    cfg = load_config()
+    settings_path = os.path.join(cfg["configDir"], "settings.json")
+    if not os.path.isfile(settings_path):
+        print(f"{settings_path} not found, skipping (Jellyseerr not yet initialized)")
+        return
+
+    timeout = cfg["apiTimeout"]
+
+    # Resolve Radarr profile
+    radarr_cfg = cfg["radarr"]
+    radarr_key = read_api_key_xml(f"{radarr_cfg['dataDir']}/config.xml")
+    radarr_bind = radarr_cfg.get("bindAddress", "127.0.0.1")
+    radarr_base = f"http://{radarr_bind}:{radarr_cfg['port']}/api/v3"
+    wait_for_api(radarr_base, radarr_key, timeout, "Radarr")
+    radarr_profile_id = resolve_profile_id(
+        radarr_base, radarr_key, radarr_cfg["profileName"], "Radarr",
+    )
+
+    # Resolve Sonarr profiles
+    sonarr_cfg = cfg["sonarr"]
+    sonarr_key = read_api_key_xml(f"{sonarr_cfg['dataDir']}/config.xml")
+    sonarr_bind = sonarr_cfg.get("bindAddress", "127.0.0.1")
+    sonarr_base = f"http://{sonarr_bind}:{sonarr_cfg['port']}/api/v3"
+    wait_for_api(sonarr_base, sonarr_key, timeout, "Sonarr")
+    sonarr_profile_id = resolve_profile_id(
+        sonarr_base, sonarr_key, sonarr_cfg["profileName"], "Sonarr",
+    )
+    sonarr_anime_profile_id = resolve_profile_id(
+        sonarr_base, sonarr_key, sonarr_cfg["animeProfileName"], "Sonarr (anime)",
+    )
+
+    # Patch settings.json
+    with open(settings_path) as f:
+        settings = json.load(f)
+
+    changed = False
+    for entry in settings.get("radarr", []):
+        if (
+            entry.get("activeProfileId") != radarr_profile_id
+            or entry.get("activeProfileName") != radarr_cfg["profileName"]
+        ):
+            entry["activeProfileId"] = radarr_profile_id
+            entry["activeProfileName"] = radarr_cfg["profileName"]
+            changed = True
+            print(
+                f"Radarr '{entry.get('name', '?')}': "
+                f"set profile to {radarr_cfg['profileName']} (ID {radarr_profile_id})"
+            )
+
+    for entry in settings.get("sonarr", []):
+        updates = {}
+        if (
+            entry.get("activeProfileId") != sonarr_profile_id
+            or entry.get("activeProfileName") != sonarr_cfg["profileName"]
+        ):
+            updates["activeProfileId"] = sonarr_profile_id
+            updates["activeProfileName"] = sonarr_cfg["profileName"]
+        if (
+            entry.get("activeAnimeProfileId") != sonarr_anime_profile_id
+            or entry.get("activeAnimeProfileName") != sonarr_cfg["animeProfileName"]
+        ):
+            updates["activeAnimeProfileId"] = sonarr_anime_profile_id
+            updates["activeAnimeProfileName"] = sonarr_cfg["animeProfileName"]
+        if updates:
+            entry.update(updates)
+            changed = True
+            print(
+                f"Sonarr '{entry.get('name', '?')}': "
+                f"set profile to {sonarr_cfg['profileName']} (ID {sonarr_profile_id})"
+            )
+
+    if not changed:
+        print("Jellyseerr profiles already correct, no changes needed")
+        return
+
+    with open(settings_path, "w") as f:
+        json.dump(settings, f, indent=2)
+    print("Updated settings.json, restarting Jellyseerr...")
+
+    result = subprocess.run(
+        ["systemctl", "restart", "jellyseerr.service"],
+        capture_output=True,
+        text=True,
+    )
+    if result.returncode != 0:
+        print(
+            f"Failed to restart Jellyseerr: {result.stderr.strip()}",
+            file=sys.stderr,
+        )
+        sys.exit(1)
+
+    print("Jellyseerr init complete")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/scripts/servarr_init.py b/scripts/servarr_init.py
new file mode 100644
index 0000000..82ae771
--- /dev/null
+++ b/scripts/servarr_init.py
@@ -0,0 +1,376 @@
+#!/usr/bin/env python3
+"""Declarative API initialization for Servarr applications.
+
+Idempotently provisions download clients, root folders, synced applications
+(Prowlarr), and naming configuration via the Servarr HTTP API.  Existing
+entities are updated when their configuration drifts from the declared state.
+"""
+
+import sys
+
+import requests as http
+
+from common import (
+    health_check_loop,
+    load_config,
+    read_api_key_xml,
+    wait_for_api,
+)
+
+# Maps Prowlarr application implementation names to Newznab parent category
+# names used for automatic sync-category detection.
+IMPLEMENTATION_CATEGORY_MAP = {
+    "Sonarr": "TV",
+    "Radarr": "Movies",
+    "Lidarr": "Audio",
+    "Readarr": "Books",
+    "Whisparr": "XXX",
+}
+
+
+def _fields_to_dict(fields):
+    """Convert the API's [{name, value}] array into a flat dict.
+
+    Some API responses omit the 'value' key for null/unset fields.
+    """
+    return {f["name"]: f.get("value") for f in fields}
+
+
+def _dict_to_fields(d):
+    """Convert a flat dict into the API's [{name, value}] array."""
+    return [{"name": k, "value": v} for k, v in d.items()]
+
+
+def _needs_field_update(desired, current_fields):
+    """Return True if any desired field value differs from the current state."""
+    current = _fields_to_dict(current_fields)
+    return any(desired.get(k) != current.get(k) for k in desired)
+
+
+# -- Download clients --------------------------------------------------------
+
+
+def ensure_download_clients(base_url, api_key, download_clients):
+    """Idempotently provision download clients, updating on drift."""
+    resp = http.get(
+        f"{base_url}/downloadclient",
+        headers={"X-Api-Key": api_key},
+        timeout=30,
+    )
+    resp.raise_for_status()
+    existing_by_name = {dc["name"]: dc for dc in resp.json()}
+
+    for dc in download_clients:
+        dc_name = dc["name"]
+        desired_fields = dc["fields"]
+
+        if dc_name in existing_by_name:
+            current = existing_by_name[dc_name]
+            drift = (
+                current.get("implementation") != dc["implementation"]
+                or current.get("configContract") != dc["configContract"]
+                or current.get("protocol") != dc["protocol"]
+                or _needs_field_update(desired_fields, current.get("fields", []))
+            )
+            if not drift:
+                print(f"Download client '{dc_name}' already correct, skipping")
+                continue
+
+            print(f"Updating download client '{dc_name}'...")
+            payload = {**current}
+            payload.update(
+                implementation=dc["implementation"],
+                configContract=dc["configContract"],
+                protocol=dc["protocol"],
+                fields=_dict_to_fields(desired_fields),
+            )
+            resp = http.put(
+                f"{base_url}/downloadclient/{current['id']}",
+                headers={"X-Api-Key": api_key, "Content-Type": "application/json"},
+                params={"forceSave": "true"},
+                json=payload,
+                timeout=30,
+            )
+            resp.raise_for_status()
+            print(f"Download client '{dc_name}' updated")
+        else:
+            print(f"Adding download client '{dc_name}'...")
+            payload = {
+                "enable": True,
+                "protocol": dc["protocol"],
+                "priority": 1,
+                "name": dc_name,
+                "implementation": dc["implementation"],
+                "configContract": dc["configContract"],
+                "fields": _dict_to_fields(desired_fields),
+                "tags": [],
+            }
+            resp = http.post(
+                f"{base_url}/downloadclient",
+                headers={"X-Api-Key": api_key, "Content-Type": "application/json"},
+                params={"forceSave": "true"},
+                json=payload,
+                timeout=30,
+            )
+            resp.raise_for_status()
+            print(f"Download client '{dc_name}' added")
+
+
+# -- Root folders ------------------------------------------------------------
+
+
+def ensure_root_folders(base_url, api_key, root_folders):
+    """Idempotently provision root folders (create-only)."""
+    resp = http.get(
+        f"{base_url}/rootfolder",
+        headers={"X-Api-Key": api_key},
+        timeout=30,
+    )
+    resp.raise_for_status()
+    existing_paths = {rf["path"] for rf in resp.json()}
+
+    for path in root_folders:
+        if path in existing_paths:
+            print(f"Root folder '{path}' already exists, skipping")
+            continue
+
+        print(f"Adding root folder '{path}'...")
+        resp = http.post(
+            f"{base_url}/rootfolder",
+            headers={"X-Api-Key": api_key, "Content-Type": "application/json"},
+            json={"path": path},
+            timeout=30,
+        )
+        resp.raise_for_status()
+        print(f"Root folder '{path}' added")
+
+
+# -- Synced applications (Prowlarr) ------------------------------------------
+
+
+def resolve_sync_categories(base_url, api_key, implementation, explicit):
+    """Resolve Newznab sync categories, auto-detecting from Prowlarr if needed."""
+    if explicit:
+        return explicit
+
+    category_name = IMPLEMENTATION_CATEGORY_MAP.get(implementation)
+    if not category_name:
+        return []
+
+    print(f"Auto-detecting sync categories for {implementation}...")
+    resp = http.get(
+        f"{base_url}/indexer/categories",
+        headers={"X-Api-Key": api_key},
+        timeout=30,
+    )
+    resp.raise_for_status()
+
+    sync_cats = []
+    for cat in resp.json():
+        if cat["name"] == category_name:
+            sync_cats.append(cat["id"])
+            for sub in cat.get("subCategories", []):
+                sync_cats.append(sub["id"])
+
+    if not sync_cats:
+        print(
+            f"Warning: could not auto-detect categories for "
+            f"'{category_name}', using empty list",
+            file=sys.stderr,
+        )
+        return []
+
+    print(f"Resolved sync categories: {sync_cats}")
+    return sync_cats
+
+
+def ensure_synced_apps(base_url, api_key, synced_apps):
+    """Idempotently provision synced applications (Prowlarr), updating on drift."""
+    resp = http.get(
+        f"{base_url}/applications",
+        headers={"X-Api-Key": api_key},
+        timeout=30,
+    )
+    resp.raise_for_status()
+    existing_by_name = {app["name"]: app for app in resp.json()}
+
+    for app in synced_apps:
+        app_name = app["name"]
+        target_api_key = read_api_key_xml(app["apiKeyFrom"])
+        sync_categories = resolve_sync_categories(
+            base_url, api_key, app["implementation"], app.get("syncCategories", []),
+        )
+
+        desired_fields = {
+            "prowlarrUrl": app["prowlarrUrl"],
+            "baseUrl": app["baseUrl"],
+            "apiKey": target_api_key,
+            "syncCategories": sync_categories,
+        }
+
+        if app_name in existing_by_name:
+            current = existing_by_name[app_name]
+            drift = (
+                current.get("implementation") != app["implementation"]
+                or current.get("configContract") != app["configContract"]
+                or current.get("syncLevel") != app["syncLevel"]
+                or _needs_field_update(desired_fields, current.get("fields", []))
+            )
+            if not drift:
+                print(f"Synced app '{app_name}' already correct, skipping")
+                continue
+
+            print(f"Updating synced app '{app_name}'...")
+            payload = {**current}
+            payload.update(
+                implementation=app["implementation"],
+                configContract=app["configContract"],
+                syncLevel=app["syncLevel"],
+                fields=_dict_to_fields(desired_fields),
+            )
+            resp = http.put(
+                f"{base_url}/applications/{current['id']}",
+                headers={"X-Api-Key": api_key, "Content-Type": "application/json"},
+                params={"forceSave": "true"},
+                json=payload,
+                timeout=30,
+            )
+            resp.raise_for_status()
+            print(f"Synced app '{app_name}' updated")
+        else:
+            print(f"Adding synced app '{app_name}'...")
+            payload = {
+                "name": app_name,
+                "implementation": app["implementation"],
+                "configContract": app["configContract"],
+                "syncLevel": app["syncLevel"],
+                "fields": _dict_to_fields(desired_fields),
+                "tags": [],
+            }
+            resp = http.post(
+                f"{base_url}/applications",
+                headers={"X-Api-Key": api_key, "Content-Type": "application/json"},
+                params={"forceSave": "true"},
+                json=payload,
+                timeout=30,
+            )
+            resp.raise_for_status()
+            print(f"Synced app '{app_name}' added")
+
+
+# -- Naming ------------------------------------------------------------------
+
+
+def update_naming(base_url, api_key, naming_config):
+    """Merge desired naming fields into the current config."""
+    if not naming_config:
+        return
+
+    print("Checking naming configuration...")
+    resp = http.get(
+        f"{base_url}/config/naming",
+        headers={"X-Api-Key": api_key},
+        timeout=30,
+    )
+    resp.raise_for_status()
+    current = resp.json()
+
+    needs_update = any(
+        naming_config.get(k) != current.get(k) for k in naming_config
+    )
+    if not needs_update:
+        print("Naming configuration already correct, skipping")
+        return
+
+    print("Updating naming configuration...")
+    merged = {**current, **naming_config}
+    resp = http.put(
+        f"{base_url}/config/naming",
+        headers={"X-Api-Key": api_key, "Content-Type": "application/json"},
+        json=merged,
+        timeout=30,
+    )
+    resp.raise_for_status()
+    print("Naming configuration updated")
+
+
+# -- Health checks -----------------------------------------------------------
+
+
+def run_health_checks(base_url, api_key, name, cfg):
+    """Run connectivity health checks if enabled."""
+    if not cfg["healthChecks"]:
+        return
+
+    print(f"Running {name} health checks...")
+    max_retries = cfg["healthCheckRetries"]
+    interval = cfg["healthCheckInterval"]
+
+    if cfg.get("downloadClients"):
+        print("Testing download client connectivity...")
+        health_check_loop(
+            f"{base_url}/downloadclient/testall",
+            api_key,
+            "download client",
+            name,
+            max_retries,
+            interval,
+        )
+
+    if cfg.get("syncedApps"):
+        print("Testing synced application connectivity...")
+        health_check_loop(
+            f"{base_url}/applications/testall",
+            api_key,
+            "synced application",
+            name,
+            max_retries,
+            interval,
+        )
+
+    print(f"{name} health checks passed")
+
+
+# -- Main --------------------------------------------------------------------
+
+
+def main():
+    cfg = load_config()
+    name = cfg["name"]
+    data_dir = cfg["dataDir"]
+    bind_address = cfg.get("bindAddress", "127.0.0.1")
+    port = cfg["port"]
+    api_version = cfg["apiVersion"]
+    api_timeout = cfg["apiTimeout"]
+
+    import os
+
+    config_xml = f"{data_dir}/config.xml"
+    if not os.path.isfile(config_xml):
+        print(f"Config file {config_xml} not found, skipping {name} init")
+        return
+
+    api_key = read_api_key_xml(config_xml)
+    base_url = f"http://{bind_address}:{port}/api/{api_version}"
+
+    wait_for_api(base_url, api_key, api_timeout, name)
+
+    if cfg.get("downloadClients"):
+        ensure_download_clients(base_url, api_key, cfg["downloadClients"])
+
+    if cfg.get("rootFolders"):
+        ensure_root_folders(base_url, api_key, cfg["rootFolders"])
+
+    if cfg.get("syncedApps"):
+        ensure_synced_apps(base_url, api_key, cfg["syncedApps"])
+
+    if cfg.get("naming"):
+        update_naming(base_url, api_key, cfg["naming"])
+
+    run_health_checks(base_url, api_key, name, cfg)
+
+    print(f"{name} init complete")
+
+
+if __name__ == "__main__":
+    main()