diff --git a/spcd/__init__.py b/spcd/__init__.py
index 2064a3d..c67180d 100644
--- a/spcd/__init__.py
+++ b/spcd/__init__.py
@@ -44,7 +44,7 @@ def clone_project_branch() -> None:
         )
 
 
-def install_actions(path: Path) -> None:
+def install_actions() -> None:
     """Make actions usable in workflows.
 
     :param path: entry point file
@@ -54,21 +54,33 @@ def install_actions(path: Path) -> None:
     name = "action.yaml"
     root = project.root / "act"
     vpy = Path(env.SPCD_PYTHON_VENV_BINARIES) / "python"
-    action = "synchronize"
-    log.info(action)
-    directory = root / action
-    fs.make_directory(directory)
-    fs.write(directory / name, f"""\
-inputs:
+    for action in ["action", "synchronize"]:
+        log.info(action)
+        directory = root / action
+        fs.make_directory(directory)
+        match action:
+            case "action":
+                inputs = """\
+  arg-1:
+    required: true
+  arg_2:
+    required: true
+"""
+            case "synchronize":
+                inputs = """\
   source:
     default: out
     required: false
+"""
+        yaml = f"""\
 runs:
   using: composite
   steps:
-  - run: {vpy} -m spcd synchronize
-""")
-    cat(directory / name)
+  - run: {vpy} -m spcd {action}
+inputs:
+{inputs}"""
+        fs.write(directory / name, yaml)
+        cat(directory / name)
 
 
 def install_commands(path: Path) -> None:
diff --git a/spcd/act.py b/spcd/act.py
index 87e9fe1..68ea759 100644
--- a/spcd/act.py
+++ b/spcd/act.py
@@ -4,14 +4,21 @@ import os
 from pathlib import Path
 
 from rwx import ps
+from rwx.log import stream as log
 
 from spcd.ci import project, projects
 from spcd.shell import env
 
 
-def synchronize(
-    source: str | None = None, target: str | None = None
-) -> None:
+def action() -> None:
+    """Display action inputs."""
+    prefix = ""
+    for variable, value in sorted(projects.environment.items()):
+        if variable.startswith(prefix):
+            log.info("%s = %s", variable, value)
+
+
+def synchronize(source: str | None = None, target: str | None = None) -> None:
     """Synchronize output towards a target.
 
     :param source: where to deploy from