diff --git a/spcd/act.py b/spcd/act.py
index 8153867..68ea759 100644
--- a/spcd/act.py
+++ b/spcd/act.py
@@ -4,11 +4,20 @@ 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 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.