From e28eec6ff9bb2fce05dc7a3123453ab72081ffd3 Mon Sep 17 00:00:00 2001
From: Swifty <craigswift13@gmail.com>
Date: Mon, 21 Jul 2025 11:48:30 +0200
Subject: [PATCH] feat(backend): Add ReverseListOrderBlock for reversing list
 element order (#10352)
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### Changes 🏗️

This PR adds a new utility block to the basic blocks collection. This
block provides a simple way to reverse the order of elements in any
list.

**New Features:**
- Added  class in
- Block accepts any list as input and returns the same list with
elements in reversed order
- Preserves the original list (creates a copy before reversing)
- Works with lists containing any type of elements

**Technical Details:**
- Block ID:
- Category:
- Input:  - The list to reverse (accepts )
- Output:  - The list with elements in reversed order
- Includes test input/output for validation

### Checklist 📋

#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
  - [x] Created an agent with the ReverseListOrderBlock
  - [x] Tested with various list types (numbers, strings, mixed types)
  - [x] Verified the block preserves the original list
  - [x] Confirmed the block correctly reverses the order of elements
  - [x] Tested with empty lists and single-element lists
- [x] Verified the block integrates properly with other blocks in a
workflow

#### For configuration changes:
- [x]  is updated or already compatible with my changes
- [x]  is updated or already compatible with my changes
- [x] I have included a list of my configuration changes in the PR
description (under **Changes**)

**Note:** No configuration changes required - this is a pure code
addition that uses the existing block framework.

Co-authored-by: Abhimanyu Yadav <122007096+Abhi1992002@users.noreply.github.com>
---
 .../backend/backend/blocks/basic.py           | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/autogpt_platform/backend/backend/blocks/basic.py b/autogpt_platform/backend/backend/blocks/basic.py
index 1ac6abfc8c..ef251489c7 100644
--- a/autogpt_platform/backend/backend/blocks/basic.py
+++ b/autogpt_platform/backend/backend/blocks/basic.py
@@ -188,3 +188,31 @@ class UniversalTypeConverterBlock(Block):
             yield "value", converted_value
         except Exception as e:
             yield "error", f"Failed to convert value: {str(e)}"
+
+
+class ReverseListOrderBlock(Block):
+    """
+    A block which takes in a list and returns it in the opposite order.
+    """
+
+    class Input(BlockSchema):
+        input_list: list[Any] = SchemaField(description="The list to reverse")
+
+    class Output(BlockSchema):
+        reversed_list: list[Any] = SchemaField(description="The list in reversed order")
+
+    def __init__(self):
+        super().__init__(
+            id="422cb708-3109-4277-bfe3-bc2ae5812777",
+            description="Reverses the order of elements in a list",
+            categories={BlockCategory.BASIC},
+            input_schema=ReverseListOrderBlock.Input,
+            output_schema=ReverseListOrderBlock.Output,
+            test_input={"input_list": [1, 2, 3, 4, 5]},
+            test_output=[("reversed_list", [5, 4, 3, 2, 1])],
+        )
+
+    async def run(self, input_data: Input, **kwargs) -> BlockOutput:
+        reversed_list = list(input_data.input_list)
+        reversed_list.reverse()
+        yield "reversed_list", reversed_list