diff --git a/templates/argo-tasks/group.yml b/templates/argo-tasks/group.yml
index 5816341bc..b66ab01c5 100644
--- a/templates/argo-tasks/group.yml
+++ b/templates/argo-tasks/group.yml
@@ -10,31 +10,48 @@ spec:
     - name: main
       inputs:
         artifacts:
+          #
+          # JSON array of things to group
+          #
+          # @example
+          # ```json
+          # ["a.json", "b.json", "c.json"]
+          # ```
           - name: input
             path: /tmp/group/input.json
-            optional: true
 
         parameters:
           - name: size
-            description: group into this number of records per group
+            description: Group into this number of records per group
 
           - name: version
-            description: container version to use
+            description: argo-task Container version to use
             default: "v2"
 
       outputs:
         parameters:
-          # Grouped output of the input
+          #
+          # JSON array of all the group ids, which correspond to a output artifact file
+          #
+          # @example
+          # ```json
+          # ["000", "001", "002", "003"]
+          # ```
+          #
+          # Workflows should use the "000" string to access the data from the output artifact folder
           - name: output
             valueFrom:
               path: /tmp/group/output.json
 
         artifacts:
-          # Grouped output of the input
+          # Grouped output of the input as one file per output groupId
+          #
+          # - /output/000.json
+          # - /output/001.json
+          # - ...
+          #
           - name: output
-            path: /tmp/group/output.json
-            archive:
-              none: {}
+            path: /tmp/group/output/
 
       container:
         image: "019359803926.dkr.ecr.ap-southeast-2.amazonaws.com/eks:argo-tasks-{{= inputs.parameters.version }}"
diff --git a/workflows/imagery/standardising.yaml b/workflows/imagery/standardising.yaml
index 7ed8a6082..041dca610 100644
--- a/workflows/imagery/standardising.yaml
+++ b/workflows/imagery/standardising.yaml
@@ -220,22 +220,16 @@ spec:
               parameters:
                 - name: scale
                   value: "{{workflow.parameters.scale}}"
-
                 - name: include
                   value: "{{workflow.parameters.include}}"
-
                 - name: source
                   value: "{{=sprig.trim(workflow.parameters.source)}}"
-
                 - name: source-epsg
                   value: "{{=sprig.trim(workflow.parameters['source-epsg'])}}"
-
                 - name: validate
                   value: "{{= workflow.parameters.validate}}"
-
                 - name: retile
                   value: "{{= workflow.parameters.retile}}"
-
                 - name: version
                   value: "{{= workflow.parameters['version-argo-tasks']}}"
 
@@ -243,32 +237,33 @@ spec:
             templateRef:
               name: tpl-at-group
               template: main
-
             arguments:
               artifacts:
                 - name: input
                   from: "{{ tasks.tile-index-validate.outputs.artifacts.files }}"
-
               parameters:
                 - name: size
                   value: "{{workflow.parameters.group}}"
-
                 - name: version
                   value: "{{= workflow.parameters['version-argo-tasks']}}"
-
             depends: "tile-index-validate"
+
           - name: standardise-validate
             template: standardise-validate
             arguments:
               parameters:
-                - name: file
+                - name: group_id
                   value: "{{item}}"
                 - name: collection-id
                   value: "{{tasks.generate-ulid.outputs.parameters.ulid}}"
                 - name: target
                   value: "{{tasks.get-location.outputs.parameters.location}}flat/"
+              artifacts:
+                - name: group_data
+                  from: "{{ tasks.group.outputs.artifacts.output }}"
             depends: "group && generate-ulid && get-location"
             withParam: "{{ tasks.group.outputs.parameters.output }}"
+
           - name: create-collection
             template: create-collection
             arguments:
@@ -278,6 +273,7 @@ spec:
                 - name: location
                   value: "{{tasks.get-location.outputs.parameters.location}}"
             depends: "standardise-validate"
+
           - name: stac-validate
             template: stac-validate
             arguments:
@@ -289,8 +285,10 @@ spec:
                   raw:
                     data: "{{tasks.stac-validate.outputs.result}}"
             depends: "create-collection"
+
           - name: get-location
             template: get-location
+
           - name: create-overview
             when: "'{{workflow.parameters.target-epsg}}' =~ '2193|3857' && '{{workflow.parameters.compression}}' != 'dem_lerc'"
             arguments:
@@ -299,6 +297,7 @@ spec:
                   value: "{{tasks.get-location.outputs.parameters.location}}"
             template: create-overview
             depends: "standardise-validate"
+
           - name: create-config
             when: "'{{workflow.parameters.target-epsg}}' =~ '2193|3857' && '{{workflow.parameters.compression}}' != 'dem_lerc'"
             arguments:
@@ -307,11 +306,14 @@ spec:
                   value: "{{tasks.get-location.outputs.parameters.location}}"
             template: create-config
             depends: "create-overview"
+
       outputs:
         parameters:
           - name: target
             valueFrom:
               parameter: "{{tasks.get-location.outputs.parameters.location}}"
+      # END TEMPLATE `main`
+
     - name: generate-ulid
       script:
         image: "019359803926.dkr.ecr.ap-southeast-2.amazonaws.com/eks:topo-imagery-{{=sprig.trim(workflow.parameters['version-topo-imagery'])}}"
@@ -325,6 +327,7 @@ spec:
           - name: ulid
             valueFrom:
               path: "/tmp/ulid"
+
     - name: standardise-validate
       retryStrategy:
         limit: "2"
@@ -332,9 +335,12 @@ spec:
         karpenter.sh/capacity-type: "spot"
       inputs:
         parameters:
-          - name: file
+          - name: group_id
           - name: collection-id
           - name: target
+        artifacts:
+          - name: group_data
+            path: /tmp/input/
       container:
         image: "019359803926.dkr.ecr.ap-southeast-2.amazonaws.com/eks:topo-imagery-{{=sprig.trim(workflow.parameters['version-topo-imagery'])}}"
         resources:
@@ -349,8 +355,8 @@ spec:
           - python
           - "/app/scripts/standardise_validate.py"
         args:
-          - "--source"
-          - "{{inputs.parameters.file}}"
+          - "--from-file"
+          - "/tmp/input/{{inputs.parameters.group_id}}.json"
           - "--target"
           - "{{inputs.parameters.target}}"
           - "--preset"
@@ -367,6 +373,7 @@ spec:
           - "{{=sprig.trim(workflow.parameters['source-epsg'])}}"
           - "--target-epsg"
           - "{{=sprig.trim(workflow.parameters['target-epsg'])}}"
+
     - name: create-collection
       retryStrategy:
         limit: "2"
@@ -404,6 +411,7 @@ spec:
           - "{{=sprig.trim(workflow.parameters['licensor-list'])}}"
           - "--concurrency"
           - "25"
+
     - name: stac-validate
       inputs:
         parameters:
@@ -421,6 +429,7 @@ spec:
             "--recursive",
             "{{inputs.parameters.location}}flat/collection.json",
           ]
+
     - name: get-location
       script:
         image: "019359803926.dkr.ecr.ap-southeast-2.amazonaws.com/eks:argo-tasks-{{=sprig.trim(workflow.parameters['version-argo-tasks'])}}"
@@ -435,6 +444,7 @@ spec:
           - name: location
             valueFrom:
               path: "/tmp/location"
+
     - name: create-overview
       retryStrategy:
         limit: "2"
@@ -460,6 +470,7 @@ spec:
             "--output",
             "{{inputs.parameters.location}}flat/",
           ]
+
     - name: create-config
       inputs:
         parameters:
@@ -487,6 +498,7 @@ spec:
           - name: url
             valueFrom:
               path: "/tmp/url"
+
   volumes:
     - name: ephemeral
       emptyDir: {}