diff --git a/src/lsp_code_action.h b/src/lsp_code_action.h
new file mode 100644
index 00000000..30c049a8
--- /dev/null
+++ b/src/lsp_code_action.h
@@ -0,0 +1,46 @@
+#pragma once
+
+#include "lsp.h"
+
+// codeAction
+struct CommandArgs {
+  lsDocumentUri textDocumentUri;
+  std::vector<lsTextEdit> edits;
+};
+MAKE_REFLECT_STRUCT_WRITER_AS_ARRAY(CommandArgs, textDocumentUri, edits);
+
+// codeLens
+struct lsCodeLensUserData {};
+MAKE_REFLECT_EMPTY_STRUCT(lsCodeLensUserData);
+
+struct lsCodeLensCommandArguments {
+  lsDocumentUri uri;
+  lsPosition position;
+  std::vector<lsLocation> locations;
+};
+
+// FIXME Don't use array in vscode-cquery
+inline void Reflect(Writer& visitor, lsCodeLensCommandArguments& value) {
+  visitor.StartArray(3);
+  Reflect(visitor, value.uri);
+  Reflect(visitor, value.position);
+  Reflect(visitor, value.locations);
+  visitor.EndArray();
+}
+
+inline void Reflect(Reader& visitor, lsCodeLensCommandArguments& value) {
+  int i = 0;
+  visitor.IterArray([&](Reader& visitor) {
+    switch (i++) {
+      case 0:
+        Reflect(visitor, value.uri);
+        break;
+      case 1:
+        Reflect(visitor, value.position);
+        break;
+      case 2:
+        Reflect(visitor, value.locations);
+        break;
+    }
+  });
+}
diff --git a/src/messages/initialize.cc b/src/messages/initialize.cc
index f6233858..7e8869d3 100644
--- a/src/messages/initialize.cc
+++ b/src/messages/initialize.cc
@@ -162,7 +162,7 @@ struct lsServerCapabilities {
   // The server provides document link support.
   lsDocumentLinkOptions documentLinkProvider;
   // The server provides execute command support.
-  optional<lsExecuteCommandOptions> executeCommandProvider;
+  lsExecuteCommandOptions executeCommandProvider;
 };
 MAKE_REFLECT_STRUCT(lsServerCapabilities,
                     textDocumentSync,
diff --git a/src/messages/text_document_code_action.cc b/src/messages/text_document_code_action.cc
index cb0f3168..df569e5c 100644
--- a/src/messages/text_document_code_action.cc
+++ b/src/messages/text_document_code_action.cc
@@ -1,5 +1,6 @@
 #include "include_complete.h"
 #include "lex_utils.h"
+#include "lsp_code_action.h"
 #include "message_handler.h"
 #include "query_utils.h"
 #include "queue_manager.h"
@@ -286,18 +287,11 @@ REGISTER_IPC_MESSAGE(Ipc_TextDocumentCodeAction);
 
 struct Out_TextDocumentCodeAction
     : public lsOutMessage<Out_TextDocumentCodeAction> {
-  struct CommandArgs {
-    lsDocumentUri textDocumentUri;
-    std::vector<lsTextEdit> edits;
-  };
   using Command = lsCommand<CommandArgs>;
 
   lsRequestId id;
   std::vector<Command> result;
 };
-MAKE_REFLECT_STRUCT_WRITER_AS_ARRAY(Out_TextDocumentCodeAction::CommandArgs,
-                                    textDocumentUri,
-                                    edits);
 MAKE_REFLECT_STRUCT(Out_TextDocumentCodeAction, jsonrpc, id, result);
 
 struct TextDocumentCodeActionHandler
diff --git a/src/messages/text_document_code_lens.cc b/src/messages/text_document_code_lens.cc
index ea6f414a..792c8426 100644
--- a/src/messages/text_document_code_lens.cc
+++ b/src/messages/text_document_code_lens.cc
@@ -1,4 +1,5 @@
 #include "clang_complete.h"
+#include "lsp_code_action.h"
 #include "message_handler.h"
 #include "query_utils.h"
 #include "queue_manager.h"
@@ -9,32 +10,6 @@ struct lsDocumentCodeLensParams {
 };
 MAKE_REFLECT_STRUCT(lsDocumentCodeLensParams, textDocument);
 
-struct lsCodeLensUserData {};
-MAKE_REFLECT_EMPTY_STRUCT(lsCodeLensUserData);
-
-struct lsCodeLensCommandArguments {
-  lsDocumentUri uri;
-  lsPosition position;
-  std::vector<lsLocation> locations;
-};
-void Reflect(Writer& visitor, lsCodeLensCommandArguments& value) {
-  visitor.StartArray(3);
-  Reflect(visitor, value.uri);
-  Reflect(visitor, value.position);
-  Reflect(visitor, value.locations);
-  visitor.EndArray();
-}
-#if false
-void Reflect(Reader& visitor, lsCodeLensCommandArguments& value) {
-  auto it = visitor.Begin();
-  Reflect(*it, value.uri);
-  ++it;
-  Reflect(*it, value.position);
-  ++it;
-  Reflect(*it, value.locations);
-}
-#endif
-
 using TCodeLens = lsCodeLens<lsCodeLensUserData, lsCodeLensCommandArguments>;
 struct Ipc_TextDocumentCodeLens
     : public RequestMessage<Ipc_TextDocumentCodeLens> {
@@ -52,23 +27,6 @@ struct Out_TextDocumentCodeLens
 };
 MAKE_REFLECT_STRUCT(Out_TextDocumentCodeLens, jsonrpc, id, result);
 
-#if false
-struct Ipc_CodeLensResolve : public IpcMessage<Ipc_CodeLensResolve> {
-  const static IpcId kIpcId = IpcId::CodeLensResolve;
-
-  lsRequestId id;
-  TCodeLens params;
-};
-MAKE_REFLECT_STRUCT(Ipc_CodeLensResolve, id, params);
-REGISTER_IPC_MESSAGE(Ipc_CodeLensResolve);
-
-struct Out_CodeLensResolve : public lsOutMessage<Out_CodeLensResolve> {
-  lsRequestId id;
-  TCodeLens result;
-};
-MAKE_REFLECT_STRUCT(Out_CodeLensResolve, jsonrpc, id, result);
-#endif
-
 struct CommonCodeLensParams {
   std::vector<TCodeLens>* result;
   QueryDatabase* db;
diff --git a/src/messages/workspace_execute_command.cc b/src/messages/workspace_execute_command.cc
new file mode 100644
index 00000000..adb405f4
--- /dev/null
+++ b/src/messages/workspace_execute_command.cc
@@ -0,0 +1,49 @@
+#include "lsp_code_action.h"
+#include "message_handler.h"
+#include "query_utils.h"
+#include "queue_manager.h"
+
+namespace {
+
+struct Ipc_WorkspaceExecuteCommand
+    : public RequestMessage<Ipc_WorkspaceExecuteCommand> {
+  const static IpcId kIpcId = IpcId::WorkspaceExecuteCommand;
+  lsCommand<lsCodeLensCommandArguments> params;
+};
+MAKE_REFLECT_STRUCT(Ipc_WorkspaceExecuteCommand, id, params);
+REGISTER_IPC_MESSAGE(Ipc_WorkspaceExecuteCommand);
+
+struct Out_WorkspaceExecuteCommand
+    : public lsOutMessage<Out_WorkspaceExecuteCommand> {
+  lsRequestId id;
+  std::variant<std::vector<lsLocation>, CommandArgs> result;
+};
+MAKE_REFLECT_STRUCT(Out_WorkspaceExecuteCommand, jsonrpc, id, result);
+
+void Reflect(Writer& visitor, Out_WorkspaceExecuteCommand& value) {
+  REFLECT_MEMBER_START();
+  REFLECT_MEMBER(jsonrpc);
+  REFLECT_MEMBER(id);
+  REFLECT_MEMBER(result);
+  REFLECT_MEMBER_END();
+}
+
+struct WorkspaceExecuteCommandHandler
+    : BaseMessageHandler<Ipc_WorkspaceExecuteCommand> {
+  void Run(Ipc_WorkspaceExecuteCommand* request) override {
+    const auto& params = request->params;
+    Out_WorkspaceExecuteCommand out;
+    out.id = request->id;
+    if (params.command == "cquery._applyFixIt") {
+    } else if (params.command == "cquery._autoImplement") {
+    } else if (params.command == "cquery._insertInclude") {
+    } else if (params.command == "cquery.showReferences") {
+      out.result = params.arguments.locations;
+    }
+
+    QueueManager::WriteStdout(IpcId::WorkspaceExecuteCommand, out);
+  }
+};
+REGISTER_MESSAGE_HANDLER(WorkspaceExecuteCommandHandler);
+
+}  // namespace
diff --git a/src/methods.inc b/src/methods.inc
index 6b6662e7..8298c0d6 100644
--- a/src/methods.inc
+++ b/src/methods.inc
@@ -25,6 +25,7 @@ CASE(TextDocumentSignatureHelp, "textDocument/signatureHelp")
 CASE(TextDocumentTypeDefinition, "textDocument/typeDefinition")
 CASE(WorkspaceDidChangeConfiguration, "workspace/didChangeConfiguration")
 CASE(WorkspaceDidChangeWatchedFiles, "workspace/didChangeWatchedFiles")
+CASE(WorkspaceExecuteCommand, "workspace/executeCommand")
 CASE(WorkspaceSymbol, "workspace/symbol")
 
 // Notification extensions