diff --git a/checkpoint.json b/checkpoint.json
index 19bd60290..b436f5244 100644
--- a/checkpoint.json
+++ b/checkpoint.json
@@ -1,35 +1,39 @@
 {
-  "timestamp": "2026-03-16T05:35:06.467919Z",
-  "current_node": "solve",
+  "timestamp": "2026-03-16T05:35:08.785630Z",
+  "current_node": "extract_patch",
   "completed_nodes": [
     "start",
     "setup",
-    "solve"
+    "solve",
+    "extract_patch"
   ],
   "node_retries": {
     "solve": 4,
     "setup": 1,
+    "extract_patch": 1,
     "start": 1
   },
   "context_values": {
-    "current_node": "solve",
+    "current_node": "extract_patch",
     "internal.retry_count.start": 1,
-    "failure_class": "transient_infra",
-    "current.preamble": "Goal: UsernameValidator allows trailing newline in usernames\nDescription\n\t\nASCIIUsernameValidator and UnicodeUsernameValidator use the regex \nr'^[\\w.@+-]+$'\nThe intent is to only allow alphanumeric characters as well as ., @, +, and -. However, a little known quirk of Python regexes is that $ will also match a trailing newline. Therefore, the user name validators will accept usernames which end with a newline. You can avoid this behavior by instead using \\A and \\Z to terminate regexes. For example, the validator regex could be changed to\nr'\\A[\\w.@+-]+\\Z'\nin order to reject usernames that end with a newline.\nI am not sure how to officially post a patch, but the required change is trivial - using the regex above in the two validators in contrib.auth.validators.\n\n\n## Completed stages\n- **setup**: fail\n  - Script: `git clone https://github.com/django/django.git . && git checkout d26b2424437dabeeca94d7900b37d2df4410da0c && python -m pip install -e .`\n  - Stdout:\n    ```\n    fatal: destination path '.' already exists and is not an empty directory.\n    ```\n  - Stderr: (empty)\n\n## Context\n- failure_class: deterministic\n- failure_signature: setup|deterministic|script failed with exit code: <n> ## stdout fatal: destination path '.' already exists and is not an empty directory.\n",
+    "failure_class": "",
+    "current.preamble": "Goal: UsernameValidator allows trailing newline in usernames\nDescription\n\t\nASCIIUsernameValidator and UnicodeUsernameValidator use the regex \nr'^[\\w.@+-]+$'\nThe intent is to only allow alphanumeric characters as well as ., @, +, and -. However, a little known quirk of Python regexes is that $ will also match a trailing newline. Therefore, the user name validators will accept usernames which end with a newline. You can avoid this behavior by instead using \\A and \\Z to terminate regexes. For example, the validator regex could be changed to\nr'\\A[\\w.@+-]+\\Z'\nin order to reject usernames that end with a newline.\nI am not sure how to officially post a patch, but the required change is trivial - using the regex above in the two validators in contrib.auth.validators.\n\n\n## Completed stages\n- **setup**: fail\n  - Script: `git clone https://github.com/django/django.git . && git checkout d26b2424437dabeeca94d7900b37d2df4410da0c && python -m pip install -e .`\n  - Stdout:\n    ```\n    fatal: destination path '.' already exists and is not an empty directory.\n    ```\n  - Stderr: (empty)\n- **solve**: fail\n\n## Context\n- failure_class: transient_infra\n- failure_signature: solve|transient_infra|api_transient|gemini|rate_limited\n",
     "internal.retry_count.setup": 1,
     "graph.goal": "UsernameValidator allows trailing newline in usernames\nDescription\n\t\nASCIIUsernameValidator and UnicodeUsernameValidator use the regex \nr'^[\\w.@+-]+$'\nThe intent is to only allow alphanumeric characters as well as ., @, +, and -. However, a little known quirk of Python regexes is that $ will also match a trailing newline. Therefore, the user name validators will accept usernames which end with a newline. You can avoid this behavior by instead using \\A and \\Z to terminate regexes. For example, the validator regex could be changed to\nr'\\A[\\w.@+-]+\\Z'\nin order to reject usernames that end with a newline.\nI am not sure how to officially post a patch, but the required change is trivial - using the regex above in the two validators in contrib.auth.validators.\n",
-    "failure_signature": "solve|transient_infra|api_transient|gemini|rate_limited",
+    "failure_signature": "",
     "internal.node_visit_count": 1,
-    "command.output": "fatal: destination path '.' already exists and is not an empty directory.\n",
+    "command.output": "",
     "command.stderr": "",
     "thread.setup.current_node": "solve",
     "internal.retry_count.solve": 4,
     "internal.run_id": "01KKTJ3G87SNY0GMTBNC4Q84AV",
+    "internal.retry_count.extract_patch": 1,
     "internal.fidelity": "compact",
-    "internal.thread_id": "setup",
-    "outcome": "fail",
+    "internal.thread_id": "solve",
+    "outcome": "success",
     "thread.start.current_node": "setup",
-    "graph.rankdir": "LR"
+    "graph.rankdir": "LR",
+    "thread.solve.current_node": "extract_patch"
   },
   "logs": [],
   "node_outcomes": {
@@ -57,15 +61,25 @@
         "failure_class": "deterministic"
       },
       "duration_ms": 30
+    },
+    "extract_patch": {
+      "status": "success",
+      "context_updates": {
+        "command.stderr": "",
+        "command.output": ""
+      },
+      "notes": "Script completed: git diff",
+      "duration_ms": 55
     }
   },
-  "next_node_id": "extract_patch",
+  "next_node_id": "exit",
   "loop_failure_signatures": {
     "setup|deterministic|script failed with exit code: <n> ## stdout fatal: destination path '.' already exists and is not an empty directory.": 1
   },
   "node_visits": {
     "solve": 1,
     "start": 1,
+    "extract_patch": 1,
     "setup": 1
   }
 }
\ No newline at end of file
diff --git a/nodes/extract_patch/script_invocation.json b/nodes/extract_patch/script_invocation.json
new file mode 100644
index 000000000..6d29afc80
--- /dev/null
+++ b/nodes/extract_patch/script_invocation.json
@@ -0,0 +1,5 @@
+{
+  "command": "git diff",
+  "language": "shell",
+  "timeout_ms": null
+}
\ No newline at end of file
diff --git a/nodes/extract_patch/script_timing.json b/nodes/extract_patch/script_timing.json
new file mode 100644
index 000000000..dea71c338
--- /dev/null
+++ b/nodes/extract_patch/script_timing.json
@@ -0,0 +1,5 @@
+{
+  "duration_ms": 52,
+  "exit_code": 0,
+  "timed_out": false
+}
\ No newline at end of file
diff --git a/nodes/extract_patch/status.json b/nodes/extract_patch/status.json
new file mode 100644
index 000000000..58ad5b738
--- /dev/null
+++ b/nodes/extract_patch/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "success",
+  "notes": "Script completed: git diff",
+  "failure_reason": null,
+  "timestamp": "2026-03-16T05:35:08.784713+00:00"
+}
\ No newline at end of file