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diff --git a/src/mongo/db/serverless/tenant_split_state_machine.idl b/src/mongo/db/serverless/tenant_split_state_machine.idl
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+# Copyright (C) 2021-present MongoDB, Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the Server Side Public License, version 1,
+# as published by MongoDB, Inc.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# Server Side Public License for more details.
+#
+# You should have received a copy of the Server Side Public License
+# along with this program. If not, see
+# <http://www.mongodb.com/licensing/server-side-public-license>.
+#
+# As a special exception, the copyright holders give permission to link the
+# code of portions of this program with the OpenSSL library under certain
+# conditions as described in each individual source file and distribute
+# linked combinations including the program with the OpenSSL library. You
+# must comply with the Server Side Public License in all respects for
+# all of the code used other than as permitted herein. If you modify file(s)
+# with this exception, you may extend this exception to your version of the
+# file(s), but you are not obligated to do so. If you do not wish to do so,
+# delete this exception statement from your version. If you delete this
+# exception statement from all source files in the program, then also delete
+# it in the license file.
+#
+global:
+    cpp_namespace: "mongo"
+    cpp_includes:
+        - "mongo/db/repl/tenant_migration_util.h"
+
+imports:
+    - "mongo/idl/basic_types.idl"
+
+enums:
+    TenantSplitDonorState:
+        description: "The state of a tenant split operation."
+        type: string
+        values:
+            kUninitialized: "uninitialized"
+            kDataSync: "data sync"
+            kBlocking: "blocking"
+            kCommitted: "committed"
+            kAborted: "aborted"
+
+structs:
+    TenantSplitDonorDocument:
+        description: "The state document for an in-progress tenant split operation."
+        strict: true
+        fields:
+            _id:
+                type: uuid
+                description: "Unique identifier for the tenant split operation."
+                cpp_name: id
+            recipientConnectionString:
+                type: string
+                description: "The connection string for the recipient slice."
+                validator:
+                    callback: "tenant_migration_util::validateConnectionString"
+            tenantId:
+                type: string
+                description: "The identifier for the tenant being migrated."
+            state:
+                type: TenantSplitDonorState
+                description: "The current state of the tenant split operation."
+                default: kUninitialized