diff --git a/castle.yaml b/castle.yaml
index 972cdae..0294a6c 100644
--- a/castle.yaml
+++ b/castle.yaml
@@ -1,42 +1,43 @@
 gateway:
   port: 9000
-
 programs:
   central-context:
     description: Content storage API useful to get context into my data dir from anywhere
       on the LAN
+    behavior: daemon
     source: components/central-context
     stack: python-fastapi
-    behavior: daemon
   notification-bridge:
     description: Desktop notification forwarder. This taps into your notifications
       system on the desktop and will forward all notifications the the central context
       server.
+    behavior: daemon
     source: components/notification-bridge
     stack: python-fastapi
-    behavior: daemon
+    install_extras:
+      - linux
   castle-api:
     description: Castle API
+    behavior: daemon
     source: castle-api
     stack: python-fastapi
-    behavior: daemon
   protonmail:
     description: ProtonMail email sync via Bridge
+    behavior: tool
     source: components/protonmail
     stack: python-cli
-    behavior: tool
   backup-collect:
     description: Collect files from various sources into backup directory
+    behavior: tool
     source: components/backup-collect
     stack: python-cli
-    behavior: tool
     system_dependencies:
     - rsync
   castle-app:
     description: Castle web app
+    behavior: frontend
     source: app
     stack: react-vite
-    behavior: frontend
     build:
       commands:
       - - pnpm
@@ -45,92 +46,91 @@ programs:
       - dist/
   devbox-connect:
     description: SSH tunnel manager with auto-reconnect
+    behavior: tool
     source: components/devbox-connect
     stack: python-cli
-    behavior: tool
   mbox2eml:
     description: MBOX to EML email converter
+    behavior: tool
     source: components/mbox2eml
     stack: python-cli
-    behavior: tool
   android-backup:
     description: Backup Android device using ADB
+    behavior: tool
     source: components/android-backup
     stack: python-cli
-    behavior: tool
     system_dependencies:
     - adb
   browser:
     description: Browse the web using natural language via browser-use
+    behavior: tool
     source: components/browser
     stack: python-cli
-    behavior: tool
   docx-extractor:
     description: Extract content and metadata from Word .docx files
+    behavior: tool
     source: components/docx-extractor
     stack: python-cli
-    behavior: tool
     system_dependencies:
     - pandoc
   docx2md:
     description: Convert Word .docx files to Markdown
+    behavior: tool
     source: components/docx2md
     stack: python-cli
-    behavior: tool
     system_dependencies:
     - pandoc
   gpt:
     description: OpenAI text generation utility
+    behavior: tool
     source: components/gpt
     stack: python-cli
-    behavior: tool
   html2text:
     description: Convert HTML content to plain text
+    behavior: tool
     source: components/html2text
     stack: python-cli
-    behavior: tool
   md2pdf:
     description: Convert Markdown files to PDF
+    behavior: tool
     source: components/md2pdf
     stack: python-cli
-    behavior: tool
     system_dependencies:
     - pandoc
     - texlive-latex-base
   mdscraper:
     description: Combine text files into a single markdown document
+    behavior: tool
     source: components/mdscraper
     stack: python-cli
-    behavior: tool
   pdf-extractor:
     description: Extract content and metadata from PDF files
+    behavior: tool
     source: components/pdf-extractor
     stack: python-cli
-    behavior: tool
   pdf2md:
     description: Convert PDF files to Markdown
+    behavior: tool
     source: components/pdf2md
     stack: python-cli
-    behavior: tool
     system_dependencies:
     - pandoc
     - poppler-utils
   schedule:
     description: Manage systemd user timers and scheduled tasks
+    behavior: tool
     source: components/schedule
     stack: python-cli
-    behavior: tool
   search:
     description: Manage self-contained searchable collections of files
+    behavior: tool
     source: components/search
     stack: python-cli
-    behavior: tool
   text-extractor:
     description: Extract content and metadata from text files
+    behavior: tool
     source: components/text-extractor
     stack: python-cli
-    behavior: tool
-
 services:
   castle-gateway:
     description: Caddy reverse proxy gateway
@@ -143,22 +143,20 @@ services:
       - /home/payne/.castle/generated/Caddyfile
       - --adapter
       - caddyfile
-    manage:
-      systemd:
-        exec_reload: caddy reload --config /home/payne/.castle/generated/Caddyfile
-          --adapter caddyfile
     expose:
       http:
         internal:
           port: 9000
         health_path: /
+    manage:
+      systemd:
+        exec_reload: caddy reload --config /home/payne/.castle/generated/Caddyfile
+          --adapter caddyfile
   central-context:
     component: central-context
     run:
       runner: python
       program: central-context
-    manage:
-      systemd: {}
     expose:
       http:
         internal:
@@ -167,18 +165,13 @@ services:
     proxy:
       caddy:
         path_prefix: /central-context
+    manage:
+      systemd: {}
   notification-bridge:
     component: notification-bridge
     run:
       runner: python
       program: notification-bridge
-    defaults:
-      env:
-        CENTRAL_CONTEXT_URL: http://localhost:9001
-        BUCKET_NAME: notifications
-        PORT: '9002'
-    manage:
-      systemd: {}
     expose:
       http:
         internal:
@@ -187,13 +180,18 @@ services:
     proxy:
       caddy:
         path_prefix: /notifications
+    manage:
+      systemd: {}
+    defaults:
+      env:
+        CENTRAL_CONTEXT_URL: http://localhost:9001
+        BUCKET_NAME: notifications
+        PORT: '9002'
   castle-api:
     component: castle-api
     run:
       runner: python
       program: castle-api
-    manage:
-      systemd: {}
     expose:
       http:
         internal:
@@ -202,24 +200,24 @@ services:
     proxy:
       caddy:
         path_prefix: /api
-
+    manage:
+      systemd: {}
   castle-mqtt:
     description: MQTT broker for inter-node mesh coordination
     run:
       runner: container
       image: eclipse-mosquitto:2
       ports:
-        1883: 1883
+        '1883': 1883
       volumes:
       - /data/castle/castle-mqtt/config:/mosquitto/config
       - /data/castle/castle-mqtt/data:/mosquitto/data
-    manage:
-      systemd: {}
     expose:
       http:
         internal:
           port: 1883
-
+    manage:
+      systemd: {}
 jobs:
   protonmail-sync:
     component: protonmail
@@ -230,12 +228,12 @@ jobs:
       - protonmail
       - sync
     schedule: '*/5 * * * *'
+    manage:
+      systemd: {}
     defaults:
       env:
         PROTONMAIL_USERNAME: paul@payne.io
         PROTONMAIL_API_KEY: ${secret:PROTONMAIL_API_KEY}
-    manage:
-      systemd: {}
   backup-collect:
     component: backup-collect
     description: Collect files from various sources into backup directory
@@ -244,11 +242,11 @@ jobs:
       argv:
       - backup-collect
     schedule: 0 2 * * *
+    manage:
+      systemd: {}
     defaults:
       env:
         DBACKUP: /data/backup
-    manage:
-      systemd: {}
   backup-data:
     description: Nightly restic backup of /data to /storage
     run:
@@ -256,9 +254,9 @@ jobs:
       argv:
       - backup-data
     schedule: 30 3 * * *
+    manage:
+      systemd: {}
     defaults:
       env:
         RESTIC_REPOSITORY: /storage/restic-data
         RESTIC_PASSWORD_FILE: /home/payne/.config/restic-password
-    manage:
-      systemd: {}
diff --git a/cli/src/castle_cli/commands/sync.py b/cli/src/castle_cli/commands/sync.py
index 640238d..8665778 100644
--- a/cli/src/castle_cli/commands/sync.py
+++ b/cli/src/castle_cli/commands/sync.py
@@ -86,8 +86,13 @@ def run_sync(args: argparse.Namespace) -> int:
             continue
         if (source_dir / "pyproject.toml").exists():
             print(f"\nInstalling {name}...")
+            prog = config.programs.get(svc.component or "") if svc.component else None
+            extras = prog.install_extras if prog else []
+            pkg_spec = str(source_dir)
+            if extras:
+                pkg_spec += "[" + ",".join(extras) + "]"
             result = subprocess.run(
-                [uv_path, "tool", "install", "--editable", str(source_dir), "--force"],
+                [uv_path, "tool", "install", "--editable", pkg_spec, "--force"],
                 capture_output=True,
                 text=True,
             )
@@ -122,8 +127,12 @@ def _try_install(
 
     if (source_dir / "pyproject.toml").exists():
         print(f"\nInstalling {name}...")
+        extras = getattr(comp, "install_extras", [])
+        pkg_spec = str(source_dir)
+        if extras:
+            pkg_spec += "[" + ",".join(extras) + "]"
         result = subprocess.run(
-            [uv_path, "tool", "install", "--editable", str(source_dir), "--force"],
+            [uv_path, "tool", "install", "--editable", pkg_spec, "--force"],
             capture_output=True,
             text=True,
         )
diff --git a/core/src/castle_core/config.py b/core/src/castle_core/config.py
index 6d2c48c..20ae245 100644
--- a/core/src/castle_core/config.py
+++ b/core/src/castle_core/config.py
@@ -134,7 +134,11 @@ def load_config(root: Path | None = None) -> CastleConfig:
     # Support both "programs:" and legacy "components:" key
     programs_data = data.get("programs") or data.get("components") or {}
     for name, comp_data in programs_data.items():
-        programs[name] = _parse_program(name, comp_data)
+        prog = _parse_program(name, comp_data)
+        # Resolve relative source paths to absolute
+        if prog.source and not Path(prog.source).is_absolute():
+            prog.source = str(root / prog.source)
+        programs[name] = prog
 
     services: dict[str, ServiceSpec] = {}
     for name, svc_data in data.get("services", {}).items():
@@ -230,7 +234,14 @@ def save_config(config: CastleConfig) -> None:
     if config.programs:
         data["programs"] = {}
         for name, spec in config.programs.items():
-            data["programs"][name] = _spec_to_yaml_dict(spec)
+            d = _spec_to_yaml_dict(spec)
+            # Store relative source paths in YAML
+            if d.get("source") and Path(d["source"]).is_absolute():
+                try:
+                    d["source"] = str(Path(d["source"]).relative_to(config.root))
+                except ValueError:
+                    pass  # not under root — keep absolute
+            data["programs"][name] = d
 
     if config.services:
         data["services"] = {}
diff --git a/core/src/castle_core/manifest.py b/core/src/castle_core/manifest.py
index 4a3c6e7..871a43b 100644
--- a/core/src/castle_core/manifest.py
+++ b/core/src/castle_core/manifest.py
@@ -185,6 +185,7 @@ class ProgramSpec(BaseModel):
     stack: str | None = None
 
     system_dependencies: list[str] = Field(default_factory=list)
+    install_extras: list[str] = Field(default_factory=list)
     version: str | None = None
     build: BuildSpec | None = None
 
diff --git a/core/src/castle_core/stacks.py b/core/src/castle_core/stacks.py
index ea257c1..852fe03 100644
--- a/core/src/castle_core/stacks.py
+++ b/core/src/castle_core/stacks.py
@@ -139,8 +139,11 @@ class PythonHandler(StackHandler):
 
     async def install(self, name: str, comp: ProgramSpec, root: Path) -> ActionResult:
         src = _source_dir(comp, root)
+        pkg_spec = str(src)
+        if comp.install_extras:
+            pkg_spec += "[" + ",".join(comp.install_extras) + "]"
         rc, output = await _run(
-            ["uv", "tool", "install", "--editable", str(src), "--force"], src
+            ["uv", "tool", "install", "--editable", pkg_spec, "--force"], src
         )
         return ActionResult(
             component=name, action="install", status="ok" if rc == 0 else "error", output=output