diff --git a/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkRuleClassFunctions.java b/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkRuleClassFunctions.java
index aaef7d5..0667618 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkRuleClassFunctions.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/skylark/SkylarkRuleClassFunctions.java
@@ -294,6 +294,7 @@
       Object analysisTest,
       Object buildSetting,
       Object cfg,
+      Object execGroups,
       StarlarkThread thread)
       throws EvalException {
     BazelStarlarkContext bazelContext = BazelStarlarkContext.from(thread);
diff --git a/src/main/java/com/google/devtools/build/lib/packages/StarlarkSemanticsOptions.java b/src/main/java/com/google/devtools/build/lib/packages/StarlarkSemanticsOptions.java
index dfb5139..5fc5bbf 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/StarlarkSemanticsOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/StarlarkSemanticsOptions.java
@@ -265,6 +265,17 @@
   public boolean experimentalSiblingRepositoryLayout;
 
   @Option(
+      name = "experimental_exec_groups",
+      defaultValue = "false",
+      documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
+      effectTags = {OptionEffectTag.EXECUTION},
+      metadataTags = {OptionMetadataTag.EXPERIMENTAL},
+      help =
+          "If set to true, allows rule authors define and access multiple execution groups "
+              + "during rule definition. This work is ongoing.")
+  public boolean experimentalExecGroups;
+
+  @Option(
       name = "experimental_allow_tags_propagation",
       oldName = "incompatible_allow_tags_propagation",
       defaultValue = "false",
@@ -677,6 +688,7 @@
             .experimentalRepoRemoteExec(experimentalRepoRemoteExec)
             .experimentalDisableExternalPackage(experimentalDisableExternalPackage)
             .experimentalSiblingRepositoryLayout(experimentalSiblingRepositoryLayout)
+            .experimentalExecGroups(experimentalExecGroups)
             .incompatibleApplicableLicenses(incompatibleApplicableLicenses)
             .incompatibleDepsetUnion(incompatibleDepsetUnion)
             .incompatibleDisableTargetProviderFields(incompatibleDisableTargetProviderFields)
diff --git a/src/main/java/com/google/devtools/build/lib/skylarkbuildapi/SkylarkRuleFunctionsApi.java b/src/main/java/com/google/devtools/build/lib/skylarkbuildapi/SkylarkRuleFunctionsApi.java
index e557592..8f1b8b6 100644
--- a/src/main/java/com/google/devtools/build/lib/skylarkbuildapi/SkylarkRuleFunctionsApi.java
+++ b/src/main/java/com/google/devtools/build/lib/skylarkbuildapi/SkylarkRuleFunctionsApi.java
@@ -328,7 +328,18 @@
             positional = false,
             doc =
                 "If set, points to the configuration transition the rule will "
-                    + "apply to its own configuration before analysis.")
+                    + "apply to its own configuration before analysis."),
+        @Param(
+            name = "exec_groups",
+            type = Dict.class,
+            named = true,
+            noneable = true,
+            defaultValue = "None",
+            positional = false,
+            enableOnlyWithFlag = FlagIdentifier.EXPERIMENTAL_EXEC_GROUPS,
+            valueWhenDisabled = "None",
+            // TODO(juliexxia): beef up this description when we actually hook up to something"
+            doc = "Dictionary to declare execution groups. DO NOT USE - not function yet.")
       },
       useStarlarkThread = true)
   BaseFunction rule(
@@ -348,6 +359,7 @@
       Object analysisTest,
       Object buildSetting,
       Object cfg,
+      Object execGroups,
       StarlarkThread thread)
       throws EvalException;
 
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/StarlarkSemantics.java b/src/main/java/com/google/devtools/build/lib/syntax/StarlarkSemantics.java
index 41ef0d7..d1b04ad 100644
--- a/src/main/java/com/google/devtools/build/lib/syntax/StarlarkSemantics.java
+++ b/src/main/java/com/google/devtools/build/lib/syntax/StarlarkSemantics.java
@@ -70,6 +70,7 @@
     public static final String EXPERIMENTAL_STARLARK_UNUSED_INPUTS_LIST =
         "experimental_starlark_unused_inputs_list";
     public static final String EXPERIMENTAL_REPO_REMOTE_EXEC = "experimental_repo_remote_exec";
+    public static final String EXPERIMENTAL_EXEC_GROUPS = "experimental_exec_groups";
     public static final String INCOMPATIBLE_APPLICABLE_LICENSES =
         "incompatible_applicable_licenses";
     public static final String INCOMPATIBLE_DISABLE_DEPSET_INPUTS =
@@ -121,6 +122,8 @@
         return experimentalStarlarkUnusedInputsList();
       case FlagIdentifier.EXPERIMENTAL_REPO_REMOTE_EXEC:
         return experimentalRepoRemoteExec();
+      case FlagIdentifier.EXPERIMENTAL_EXEC_GROUPS:
+        return experimentalExecGroups();
       case FlagIdentifier.INCOMPATIBLE_APPLICABLE_LICENSES:
         return incompatibleApplicableLicenses();
       case FlagIdentifier.INCOMPATIBLE_DISABLE_DEPSET_INPUTS:
@@ -212,6 +215,8 @@
 
   public abstract boolean experimentalSiblingRepositoryLayout();
 
+  public abstract boolean experimentalExecGroups();
+
   public abstract boolean incompatibleAlwaysCheckDepsetElements();
 
   public abstract boolean incompatibleApplicableLicenses();
@@ -318,6 +323,7 @@
           .experimentalRepoRemoteExec(false)
           .experimentalDisableExternalPackage(false)
           .experimentalSiblingRepositoryLayout(false)
+          .experimentalExecGroups(false)
           .incompatibleAlwaysCheckDepsetElements(true)
           .incompatibleApplicableLicenses(false)
           .incompatibleDepsetUnion(true)
@@ -386,6 +392,8 @@
 
     public abstract Builder experimentalSiblingRepositoryLayout(boolean value);
 
+    public abstract Builder experimentalExecGroups(boolean value);
+
     public abstract Builder incompatibleAlwaysCheckDepsetElements(boolean value);
 
     public abstract Builder incompatibleApplicableLicenses(boolean value);
diff --git a/src/main/java/com/google/devtools/build/skydoc/fakebuildapi/FakeSkylarkRuleFunctionsApi.java b/src/main/java/com/google/devtools/build/skydoc/fakebuildapi/FakeSkylarkRuleFunctionsApi.java
index 72cc829..a535549 100644
--- a/src/main/java/com/google/devtools/build/skydoc/fakebuildapi/FakeSkylarkRuleFunctionsApi.java
+++ b/src/main/java/com/google/devtools/build/skydoc/fakebuildapi/FakeSkylarkRuleFunctionsApi.java
@@ -147,6 +147,7 @@
       Object analysisTest,
       Object buildSetting,
       Object cfg,
+      Object execGroups,
       StarlarkThread thread)
       throws EvalException {
     ImmutableMap.Builder<String, FakeDescriptor> attrsMapBuilder = ImmutableMap.builder();
diff --git a/src/test/java/com/google/devtools/build/lib/packages/SkylarkSemanticsConsistencyTest.java b/src/test/java/com/google/devtools/build/lib/packages/SkylarkSemanticsConsistencyTest.java
index 6a183e8..d3d2e05 100644
--- a/src/test/java/com/google/devtools/build/lib/packages/SkylarkSemanticsConsistencyTest.java
+++ b/src/test/java/com/google/devtools/build/lib/packages/SkylarkSemanticsConsistencyTest.java
@@ -139,6 +139,7 @@
         "--incompatible_allow_tags_propagation=" + rand.nextBoolean(), // flag, Java names differ
         "--experimental_cc_shared_library=" + rand.nextBoolean(),
         "--experimental_repo_remote_exec=" + rand.nextBoolean(),
+        "--experimental_exec_groups=" + rand.nextBoolean(),
         "--incompatible_always_check_depset_elements=" + rand.nextBoolean(),
         "--incompatible_applicable_licenses=" + rand.nextBoolean(),
         "--incompatible_depset_for_libraries_to_link_getter=" + rand.nextBoolean(),
@@ -193,6 +194,7 @@
         .experimentalAllowTagsPropagation(rand.nextBoolean())
         .experimentalCcSharedLibrary(rand.nextBoolean())
         .experimentalRepoRemoteExec(rand.nextBoolean())
+        .experimentalExecGroups(rand.nextBoolean())
         .incompatibleAlwaysCheckDepsetElements(rand.nextBoolean())
         .incompatibleApplicableLicenses(rand.nextBoolean())
         .incompatibleDepsetForLibrariesToLinkGetter(rand.nextBoolean())