diff --git a/sql/json/indexer_configuration.tool_configuration.schema.json b/sql/json/indexer_configuration.tool_configuration.schema.json
new file mode 100644
index 00000000..28396b45
--- /dev/null
+++ b/sql/json/indexer_configuration.tool_configuration.schema.json
@@ -0,0 +1,11 @@
+{
+    "$schema": "http://json-schema.org/schema#",
+    "id": "http://softwareheritage.org/schemas/indexer_configuration.tool_configuration.schema.json",
+
+    "type": "object",
+    "properties": {
+        "command_line": {
+            "type": "string"
+        }
+    }
+}