diff --git a/src/main/java/com/google/devtools/build/lib/actions/FailAction.java b/src/main/java/com/google/devtools/build/lib/actions/FailAction.java
index 81c2084..829a74e 100644
--- a/src/main/java/com/google/devtools/build/lib/actions/FailAction.java
+++ b/src/main/java/com/google/devtools/build/lib/actions/FailAction.java
@@ -34,11 +34,16 @@
 
   private static final String GUID = "626cb78a-810f-4af3-979c-ee194955f04c";
 
-  private final String errorMessage;
+  private final FailureDetail failureDetail;
 
-  public FailAction(ActionOwner owner, Iterable<Artifact> outputs, String errorMessage) {
+  public FailAction(
+      ActionOwner owner, Iterable<Artifact> outputs, String errorMessage, Code failActionCode) {
     super(owner, NestedSetBuilder.emptySet(Order.STABLE_ORDER), outputs);
-    this.errorMessage = errorMessage;
+    this.failureDetail =
+        FailureDetail.newBuilder()
+            .setMessage(errorMessage + " caused by " + getOwner().getLabel())
+            .setFailAction(FailureDetails.FailAction.newBuilder().setCode(failActionCode).build())
+            .build();
   }
 
   @Override
@@ -47,26 +52,14 @@
   }
 
   public String getErrorMessage() {
-    return errorMessage;
+    return failureDetail.getMessage();
   }
 
   @Override
   public ActionResult execute(ActionExecutionContext actionExecutionContext)
       throws ActionExecutionException {
     throw new ActionExecutionException(
-        errorMessage,
-        this,
-        false,
-        DetailedExitCode.of(
-            FailureDetail.newBuilder()
-                .setMessage(
-                    "FailAction intentional failure: "
-                        + errorMessage
-                        + " caused by "
-                        + getOwner().getLabel())
-                .setFailAction(
-                    FailureDetails.FailAction.newBuilder().setCode(Code.INTENTIONAL_FAILURE))
-                .build()));
+        failureDetail.getMessage(), this, false, DetailedExitCode.of(failureDetail));
   }
 
   @Override
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/ConfiguredTargetFactory.java b/src/main/java/com/google/devtools/build/lib/analysis/ConfiguredTargetFactory.java
index f61fd6a..52c24aa 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/ConfiguredTargetFactory.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/ConfiguredTargetFactory.java
@@ -67,6 +67,7 @@
 import com.google.devtools.build.lib.packages.semantics.BuildLanguageOptions;
 import com.google.devtools.build.lib.profiler.memory.CurrentRuleTracker;
 import com.google.devtools.build.lib.rules.cpp.DeniedImplicitOutputMarkerProvider;
+import com.google.devtools.build.lib.server.FailureDetails.FailAction.Code;
 import com.google.devtools.build.lib.skyframe.AspectValueKey;
 import com.google.devtools.build.lib.skyframe.ConfiguredTargetAndData;
 import com.google.devtools.build.lib.skyframe.ConfiguredTargetKey;
@@ -624,7 +625,8 @@
           new FailAction(
               ruleContext.getActionOwner(),
               ruleContext.getOutputArtifacts(),
-              "Missing fragment class: " + missingFragmentClass.getName()));
+              "Missing fragment class: " + missingFragmentClass.getName(),
+              Code.FRAGMENT_CLASS_MISSING));
     }
     builder.add(RunfilesProvider.class, RunfilesProvider.simple(Runfiles.EMPTY));
     try {
diff --git a/src/main/java/com/google/devtools/build/lib/rules/android/AndroidBinary.java b/src/main/java/com/google/devtools/build/lib/rules/android/AndroidBinary.java
index d08471a..bad9b7f 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/android/AndroidBinary.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/android/AndroidBinary.java
@@ -81,6 +81,7 @@
 import com.google.devtools.build.lib.rules.java.JavaToolchainProvider;
 import com.google.devtools.build.lib.rules.java.OneVersionCheckActionBuilder;
 import com.google.devtools.build.lib.rules.java.ProguardSpecProvider;
+import com.google.devtools.build.lib.server.FailureDetails.FailAction.Code;
 import com.google.devtools.build.lib.vfs.PathFragment;
 import java.io.Serializable;
 import java.util.ArrayList;
@@ -833,7 +834,8 @@
         new FailAction(
             ruleContext.getActionOwner(),
             failures.build().toSet(),
-            String.format("Can't run Proguard without proguard_specs")));
+            "Can't run Proguard without proguard_specs",
+            Code.PROGUARD_SPECS_MISSING));
     return new ProguardOutput(deployJarArtifact, null, null, null, null, null, null);
   }
 
diff --git a/src/main/java/com/google/devtools/build/lib/rules/android/BUILD b/src/main/java/com/google/devtools/build/lib/rules/android/BUILD
index 559a5de..42e45fe 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/android/BUILD
+++ b/src/main/java/com/google/devtools/build/lib/rules/android/BUILD
@@ -89,6 +89,7 @@
         "//src/main/java/com/google/devtools/common/options",
         "//src/main/java/net/starlark/java/eval",
         "//src/main/protobuf:android_deploy_info_java_proto",
+        "//src/main/protobuf:failure_details_java_proto",
         "//third_party:android_common_25_0_0_lite",
         "//third_party:auto_value",
         "//third_party:guava",
diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CcLibrary.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CcLibrary.java
index f0ac8dd..0076362 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CcLibrary.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CcLibrary.java
@@ -52,6 +52,7 @@
 import com.google.devtools.build.lib.rules.cpp.CcCompilationHelper.CompilationInfo;
 import com.google.devtools.build.lib.rules.cpp.CcToolchainFeatures.FeatureConfiguration;
 import com.google.devtools.build.lib.rules.cpp.Link.LinkTargetType;
+import com.google.devtools.build.lib.server.FailureDetails.FailAction.Code;
 import com.google.devtools.build.lib.util.FileTypeSet;
 import com.google.devtools.build.lib.vfs.PathFragment;
 import java.util.ArrayList;
@@ -268,8 +269,12 @@
                 ruleContext.getConfiguration(),
                 LinkTargetType.INTERFACE_DYNAMIC_LIBRARY));
       }
-      ruleContext.registerAction(new FailAction(ruleContext.getActionOwner(),
-          dynamicLibraries.build(), "Toolchain does not support dynamic linking"));
+      ruleContext.registerAction(
+          new FailAction(
+              ruleContext.getActionOwner(),
+              dynamicLibraries.build(),
+              "Toolchain does not support dynamic linking",
+              Code.DYNAMIC_LINKING_NOT_SUPPORTED));
     } else if (!createDynamicLibrary
         && ruleContext.attributes().isConfigurable("srcs")) {
       // If "srcs" is configurable, the .so output is always declared because the logic that
@@ -293,9 +298,13 @@
                 ruleContext.getConfiguration(),
                 LinkTargetType.INTERFACE_DYNAMIC_LIBRARY));
       }
-      ruleContext.registerAction(new FailAction(ruleContext.getActionOwner(),
-          dynamicLibraries.build(), "configurable \"srcs\" triggers an implicit .so output "
-          + "even though there are no sources to compile in this configuration"));
+      ruleContext.registerAction(
+          new FailAction(
+              ruleContext.getActionOwner(),
+              dynamicLibraries.build(),
+              "configurable \"srcs\" triggers an implicit .so output even though there are no"
+                  + " sources to compile in this configuration",
+              Code.SOURCE_FILES_MISSING));
     }
 
     CompilationInfo compilationInfo = compilationHelper.compile(ruleContext::ruleError);
diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppHelper.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppHelper.java
index 0f29222..d76a5aa 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppHelper.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppHelper.java
@@ -66,6 +66,7 @@
 import com.google.devtools.build.lib.rules.cpp.CppConfiguration.DynamicMode;
 import com.google.devtools.build.lib.rules.cpp.CppConfiguration.Tool;
 import com.google.devtools.build.lib.rules.cpp.Link.LinkTargetType;
+import com.google.devtools.build.lib.server.FailureDetails.FailAction.Code;
 import com.google.devtools.build.lib.shell.ShellUtils;
 import com.google.devtools.build.lib.util.FileTypeSet;
 import com.google.devtools.build.lib.util.Fingerprint;
@@ -490,7 +491,8 @@
               ImmutableList.of(linuxDefault),
               String.format(
                   "the given toolchain supports creation of %s instead of %s",
-                  result.getExecPathString(), linuxDefault.getExecPathString())));
+                  result.getExecPathString(), linuxDefault.getExecPathString()),
+              Code.INCORRECT_TOOLCHAIN));
     }
 
     return result;
diff --git a/src/main/java/com/google/devtools/build/lib/rules/python/BUILD b/src/main/java/com/google/devtools/build/lib/rules/python/BUILD
index 63b821d..186f585 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/python/BUILD
+++ b/src/main/java/com/google/devtools/build/lib/rules/python/BUILD
@@ -54,6 +54,7 @@
         "//src/main/java/net/starlark/java/eval",
         "//src/main/java/net/starlark/java/syntax",
         "//src/main/protobuf:extra_actions_base_java_proto",
+        "//src/main/protobuf:failure_details_java_proto",
         "//third_party:error_prone_annotations",
         "//third_party:guava",
         "//third_party:jsr305",
diff --git a/src/main/java/com/google/devtools/build/lib/rules/python/PyCommon.java b/src/main/java/com/google/devtools/build/lib/rules/python/PyCommon.java
index c9da2de..18fb6ae 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/python/PyCommon.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/python/PyCommon.java
@@ -49,6 +49,7 @@
 import com.google.devtools.build.lib.packages.Type;
 import com.google.devtools.build.lib.rules.cpp.CcInfo;
 import com.google.devtools.build.lib.rules.cpp.CppFileTypes;
+import com.google.devtools.build.lib.server.FailureDetails.FailAction.Code;
 import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
 import com.google.devtools.build.lib.util.FileType;
 import com.google.devtools.build.lib.util.OS;
@@ -596,7 +597,11 @@
       return false;
     } else {
       ruleContext.registerAction(
-          new FailAction(ruleContext.getActionOwner(), ImmutableList.of(executable), error));
+          new FailAction(
+              ruleContext.getActionOwner(),
+              ImmutableList.of(executable),
+              error,
+              Code.INCORRECT_PYTHON_VERSION));
       return true;
     }
   }
diff --git a/src/main/protobuf/failure_details.proto b/src/main/protobuf/failure_details.proto
index 639b574..82537cd 100644
--- a/src/main/protobuf/failure_details.proto
+++ b/src/main/protobuf/failure_details.proto
@@ -1023,6 +1023,13 @@
   enum Code {
     FAIL_ACTION_UNKNOWN = 0 [(metadata) = { exit_code: 37 }];
     INTENTIONAL_FAILURE = 1 [(metadata) = { exit_code: 1 }];
+    INCORRECT_PYTHON_VERSION = 2 [(metadata) = { exit_code: 1 }];
+    PROGUARD_SPECS_MISSING = 3 [(metadata) = { exit_code: 1 }];
+    DYNAMIC_LINKING_NOT_SUPPORTED = 4 [(metadata) = { exit_code: 1 }];
+    SOURCE_FILES_MISSING = 5 [(metadata) = { exit_code: 1 }];
+    INCORRECT_TOOLCHAIN = 6 [(metadata) = { exit_code: 1 }];
+    FRAGMENT_CLASS_MISSING = 7 [(metadata) = { exit_code: 1 }];
+    reserved 8, 9; // For internal use
   }
 
   Code code = 1;
diff --git a/src/test/java/com/google/devtools/build/lib/actions/BUILD b/src/test/java/com/google/devtools/build/lib/actions/BUILD
index 0c7deb6..4a56e9f 100644
--- a/src/test/java/com/google/devtools/build/lib/actions/BUILD
+++ b/src/test/java/com/google/devtools/build/lib/actions/BUILD
@@ -60,6 +60,7 @@
         "//src/main/java/com/google/devtools/common/options",
         "//src/main/java/net/starlark/java/eval",
         "//src/main/protobuf:action_cache_java_proto",
+        "//src/main/protobuf:failure_details_java_proto",
         "//src/test/java/com/google/devtools/build/lib/actions/util",
         "//src/test/java/com/google/devtools/build/lib/events:testutil",
         "//src/test/java/com/google/devtools/build/lib/testutil",
diff --git a/src/test/java/com/google/devtools/build/lib/actions/FailActionTest.java b/src/test/java/com/google/devtools/build/lib/actions/FailActionTest.java
index 601a412..afb6d49 100644
--- a/src/test/java/com/google/devtools/build/lib/actions/FailActionTest.java
+++ b/src/test/java/com/google/devtools/build/lib/actions/FailActionTest.java
@@ -19,6 +19,7 @@
 
 import com.google.common.collect.ImmutableList;
 import com.google.devtools.build.lib.actions.util.ActionsTestUtil;
+import com.google.devtools.build.lib.server.FailureDetails.FailAction.Code;
 import com.google.devtools.build.lib.testutil.Scratch;
 import java.util.Collection;
 import org.junit.Before;
@@ -46,7 +47,7 @@
         ActionsTestUtil.createArtifact(
             ArtifactRoot.asDerivedRoot(scratch.dir("/"), "out"), scratch.file("/out/foo"));
     outputs = ImmutableList.of(anOutput);
-    failAction = new FailAction(NULL_ACTION_OWNER, outputs, errorMessage);
+    failAction = new FailAction(NULL_ACTION_OWNER, outputs, errorMessage, Code.FAIL_ACTION_UNKNOWN);
     actionGraph.registerAction(failAction);
     assertThat(actionGraph.getGeneratingAction(anOutput)).isSameInstanceAs(failAction);
   }
@@ -55,7 +56,7 @@
   public void testExecutingItYieldsExceptionWithErrorMessage() {
     ActionExecutionException e =
         assertThrows(ActionExecutionException.class, () -> failAction.execute(null));
-    assertThat(e).hasMessageThat().isEqualTo(errorMessage);
+    assertThat(e).hasMessageThat().contains(errorMessage);
   }
 
   @Test
diff --git a/src/test/java/com/google/devtools/build/lib/testutil/BUILD b/src/test/java/com/google/devtools/build/lib/testutil/BUILD
index 0395805..528acb0 100644
--- a/src/test/java/com/google/devtools/build/lib/testutil/BUILD
+++ b/src/test/java/com/google/devtools/build/lib/testutil/BUILD
@@ -65,6 +65,7 @@
         "//src/main/java/com/google/devtools/build/lib/vfs:pathfragment",
         "//src/main/java/com/google/devtools/build/lib/vfs/inmemoryfs",
         "//src/main/java/net/starlark/java/syntax",
+        "//src/main/protobuf:failure_details_java_proto",
         "//third_party:guava",
         "//third_party:jsr305",
         "//third_party:junit4",
diff --git a/src/test/java/com/google/devtools/build/lib/testutil/UnknownRuleConfiguredTarget.java b/src/test/java/com/google/devtools/build/lib/testutil/UnknownRuleConfiguredTarget.java
index 33b0fae..ea0bed6 100644
--- a/src/test/java/com/google/devtools/build/lib/testutil/UnknownRuleConfiguredTarget.java
+++ b/src/test/java/com/google/devtools/build/lib/testutil/UnknownRuleConfiguredTarget.java
@@ -28,6 +28,7 @@
 import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
 import com.google.devtools.build.lib.collect.nestedset.Order;
 import com.google.devtools.build.lib.packages.Rule;
+import com.google.devtools.build.lib.server.FailureDetails.FailAction.Code;
 
 /**
  * A null implementation of ConfiguredTarget for rules we don't know how to build.
@@ -55,7 +56,8 @@
         new FailAction(
             context.getActionOwner(),
             filesToBuild.toList(),
-            "cannot build " + rule.getRuleClass() + " rules such as " + rule.getLabel()));
+            "cannot build " + rule.getRuleClass() + " rules such as " + rule.getLabel(),
+            Code.FAIL_ACTION_UNKNOWN));
     return new RuleConfiguredTargetBuilder(context)
         .setFilesToBuild(filesToBuild)
         .add(RunfilesProvider.class, RunfilesProvider.simple(Runfiles.EMPTY))