diff --git a/MODULE.bazel b/MODULE.bazel
index f664840..ee4789b 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -4,6 +4,7 @@ module(
     compatibility_level = 1,
 )
 
+bazel_dep(name = "bazel_skylib", version = "1.3.0")
 bazel_dep(name = "platforms", version = "0.0.7")
 
 cc_configure = use_extension("@bazel_tools//tools/cpp:cc_configure.bzl", "cc_configure_extension")
@@ -11,5 +12,4 @@ use_repo(cc_configure, "local_config_cc_toolchains")
 
 register_toolchains("@local_config_cc_toolchains//:all")
 
-bazel_dep(name = "bazel_skylib", version = "1.3.0", dev_dependency = True)
 bazel_dep(name = "rules_testing", version = "0.6.0", dev_dependency = True)
diff --git a/cc/toolchains/args.bzl b/cc/toolchains/args.bzl
index a19c16a..b2f3660 100644
--- a/cc/toolchains/args.bzl
+++ b/cc/toolchains/args.bzl
@@ -82,6 +82,7 @@ directory as additional files.
 """,
         ),
         "args": attr.string_list(
+            mandatory = True,
             doc = """Arguments that should be added to the command-line.
 
 These are evaluated in order, with earlier args appearing earlier in the
diff --git a/cc/toolchains/impl/toolchain_config.bzl b/cc/toolchains/impl/toolchain_config.bzl
index 7a69dc0..37e5959 100644
--- a/cc/toolchains/impl/toolchain_config.bzl
+++ b/cc/toolchains/impl/toolchain_config.bzl
@@ -53,7 +53,7 @@ def _cc_toolchain_config_impl(ctx):
         fail("Features is a reserved attribute in bazel. Did you mean 'toolchain_features'")
 
     if not ctx.attr._enabled[BuildSettingInfo].value and not ctx.attr.skip_experimental_flag_validation_for_test:
-        fail("Rule based toolchains are experimental. To use it, please add --//cc/toolchains:experimental_enable_rule_based_toolchains to your bazelrc")
+        fail("Rule based toolchains are experimental. To use it, please add --@rules_cc//cc/toolchains:experimental_enable_rule_based_toolchains to your bazelrc")
 
     toolchain_config = toolchain_config_info(
         label = ctx.label,
diff --git a/cc/toolchains/tool.bzl b/cc/toolchains/tool.bzl
index 797ef52..fb552ca 100644
--- a/cc/toolchains/tool.bzl
+++ b/cc/toolchains/tool.bzl
@@ -21,8 +21,15 @@ load(
 )
 
 def _cc_tool_impl(ctx):
-    exe = ctx.executable.executable
-    runfiles = collect_data(ctx, ctx.attr.data + [ctx.attr.executable])
+    exe_info = ctx.attr.src[DefaultInfo]
+    if exe_info.files_to_run != None and exe_info.files_to_run.executable != None:
+        exe = exe_info.files_to_run.executable
+    elif len(exe_info.files.to_list()) == 1:
+        exe = exe_info.files.to_list()[0]
+    else:
+        fail("Expected cc_tool's src attribute to be either an executable or a single file")
+
+    runfiles = collect_data(ctx, ctx.attr.data + [ctx.attr.src])
     tool = ToolInfo(
         label = ctx.label,
         exe = exe,
@@ -37,7 +44,7 @@ def _cc_tool_impl(ctx):
     link = ctx.actions.declare_file(ctx.label.name)
     ctx.actions.symlink(
         output = link,
-        target_file = ctx.executable.executable,
+        target_file = exe,
         is_executable = True,
     )
     return [
@@ -55,9 +62,8 @@ cc_tool = rule(
     implementation = _cc_tool_impl,
     # @unsorted-dict-items
     attrs = {
-        "executable": attr.label(
+        "src": attr.label(
             allow_files = True,
-            executable = True,
             cfg = "exec",
             doc = """The underlying binary that this tool represents.
 
diff --git a/tests/rule_based_toolchain/tool/BUILD b/tests/rule_based_toolchain/tool/BUILD
index 31c2813..d16ded6 100644
--- a/tests/rule_based_toolchain/tool/BUILD
+++ b/tests/rule_based_toolchain/tool/BUILD
@@ -6,8 +6,8 @@ load(":tool_test.bzl", "TARGETS", "TESTS")
 util.helper_target(
     cc_tool,
     name = "tool",
+    src = "//tests/rule_based_toolchain/testdata:bin_wrapper.sh",
     data = ["//tests/rule_based_toolchain/testdata:bin"],
-    executable = "//tests/rule_based_toolchain/testdata:bin_wrapper.sh",
     execution_requirements = ["requires-network"],
     requires_any_of = ["//tests/rule_based_toolchain/features:direct_constraint"],
 )
@@ -15,7 +15,7 @@ util.helper_target(
 util.helper_target(
     cc_tool,
     name = "wrapped_tool",
-    executable = "//tests/rule_based_toolchain/testdata:bin_wrapper",
+    src = "//tests/rule_based_toolchain/testdata:bin_wrapper",
     visibility = ["//tests/rule_based_toolchain:__subpackages__"],
 )
 
diff --git a/tests/rule_based_toolchain/toolchain_config/BUILD b/tests/rule_based_toolchain/toolchain_config/BUILD
index f7f194d..f2e91f5 100644
--- a/tests/rule_based_toolchain/toolchain_config/BUILD
+++ b/tests/rule_based_toolchain/toolchain_config/BUILD
@@ -142,7 +142,7 @@ util.helper_target(
 util.helper_target(
     cc_tool,
     name = "requires_all_simple_tool",
-    executable = "//tests/rule_based_toolchain/testdata:bin_wrapper.sh",
+    src = "//tests/rule_based_toolchain/testdata:bin_wrapper.sh",
     requires_any_of = [":all_simple_features"],
 )