diff --git a/CHANGES.md b/CHANGELOG.md
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rename from CHANGES.md
rename to CHANGELOG.md
diff --git a/versions.ncl b/versions.ncl
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--- /dev/null
+++ b/versions.ncl
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+# Core tools versions for provisioning system (Nickel IaC)
+# Migrated from KCL - defines tool versions with detection methods
+
+{
+  core_versions = [
+    {
+      name = "nushell",
+      version = { current = "0.109.1", source = "https://github.com/nushell/nushell/releases", tags = "https://github.com/nushell/nushell/tags", site = "https://www.nushell.sh/", check_latest = false, grace_period = 86400 },
+      dependencies = [],
+      detector = { method = "command", command = "nu -v", pattern = "(?P<capture0>[\\d.]+\\.[\\d.]+)", capture = "capture0" },
+    },
+    {
+      name = "nickel",
+      version = { current = "1.15.1", source = "https://github.com/tweag/nickel/releases", tags = "https://github.com/tweag/nickel/tags", site = "https://nickel-lang.org", check_latest = false, grace_period = 86400 },
+      dependencies = [],
+      detector = { method = "command", command = "nickel --version", pattern = "nickel\\s+(?P<capture0>[\\d.]+)", capture = "capture0" },
+    },
+    {
+      name = "sops",
+      version = { current = "3.10.2", source = "https://github.com/getsops/sops/releases", tags = "https://github.com/getsops/sops/tags", site = "https://github.com/getsops/sops", check_latest = false, grace_period = 86400 },
+      dependencies = ["age"],
+      detector = { method = "command", command = "sops -v", pattern = "sops\\s+(?P<capture0>[\\d.]+)", capture = "capture0" },
+    },
+    {
+      name = "age",
+      version = { current = "1.2.1", source = "https://github.com/FiloSottile/age/releases", tags = "https://github.com/FiloSottile/age/tags", site = "https://github.com/FiloSottile/age", check_latest = false, grace_period = 86400 },
+      dependencies = [],
+      detector = { method = "command", command = "age --version", pattern = "v(?P<capture0>[\\d.]+)", capture = "capture0" },
+    },
+    {
+      name = "k9s",
+      version = { current = "0.50.6", source = "https://github.com/derailed/k9s/releases", tags = "https://github.com/derailed/k9s/tags", site = "https://k9scli.io/", check_latest = true, grace_period = 86400 },
+      dependencies = [],
+      detector = { method = "command", command = "k9s version", pattern = "Version\\s+v(?P<capture0>[\\d.]+)", capture = "capture0" },
+    },
+  ]
+}