diff --git a/checkpoint.json b/checkpoint.json
index e7284863d..95fea4553 100644
--- a/checkpoint.json
+++ b/checkpoint.json
@@ -1,11 +1,13 @@
 {
-  "timestamp": "2026-03-16T12:04:55.460014Z",
-  "current_node": "setup",
+  "timestamp": "2026-03-16T12:07:05.934406Z",
+  "current_node": "solve",
   "completed_nodes": [
     "start",
-    "setup"
+    "setup",
+    "solve"
   ],
   "node_retries": {
+    "solve": 4,
     "start": 1,
     "setup": 1
   },
@@ -13,19 +15,21 @@
     "internal.node_visit_count": 1,
     "command.output": "fatal: destination path '.' already exists and is not an empty directory.\n",
     "graph.goal": "Possible bug in io.fits related to D exponents\nI came across the following code in ``fitsrec.py``:\r\n\r\n```python\r\n        # Replace exponent separator in floating point numbers\r\n        if 'D' in format:\r\n            output_field.replace(encode_ascii('E'), encode_ascii('D'))\r\n```\r\n\r\nI think this may be incorrect because as far as I can tell ``replace`` is not an in-place operation for ``chararray`` (it returns a copy). Commenting out this code doesn't cause any tests to fail so I think this code isn't being tested anyway.\n\n\n\n## Additional Context\n\nIt is tested with `astropy/io/fits/tests/test_checksum.py:test_ascii_table_data` but indeed the operation is not inplace and it does not fail. Using 'D' is probably better, but since #5362 (I had vague memory about something like this ^^, see also #5353) anyway 'D' and 'E' are read as double, so I think there is not difference on Astropy side.",
+    "thread.setup.current_node": "solve",
     "graph.rankdir": "LR",
     "internal.run_id": "01KKV8D407F7XQCMQDCS4WRYJK",
     "internal.fidelity": "compact",
-    "internal.thread_id": "start",
-    "failure_class": "deterministic",
+    "internal.thread_id": "setup",
+    "failure_class": "transient_infra",
     "internal.retry_count.setup": 1,
     "internal.retry_count.start": 1,
     "thread.start.current_node": "setup",
-    "current.preamble": "Goal: Possible bug in io.fits related to D exponents\nI came across the following code in ``fitsrec.py``:\r\n\r\n```python\r\n        # Replace exponent separator in floating point numbers\r\n        if 'D' in format:\r\n            output_field.replace(encode_ascii('E'), encode_ascii('D'))\r\n```\r\n\r\nI think this may be incorrect because as far as I can tell ``replace`` is not an in-place operation for ``chararray`` (it returns a copy). Commenting out this code doesn't cause any tests to fail so I think this code isn't being tested anyway.\n\n\n\n## Additional Context\n\nIt is tested with `astropy/io/fits/tests/test_checksum.py:test_ascii_table_data` but indeed the operation is not inplace and it does not fail. Using 'D' is probably better, but since #5362 (I had vague memory about something like this ^^, see also #5353) anyway 'D' and 'E' are read as double, so I think there is not difference on Astropy side.\n",
+    "current.preamble": "Goal: Possible bug in io.fits related to D exponents\nI came across the following code in ``fitsrec.py``:\r\n\r\n```python\r\n        # Replace exponent separator in floating point numbers\r\n        if 'D' in format:\r\n            output_field.replace(encode_ascii('E'), encode_ascii('D'))\r\n```\r\n\r\nI think this may be incorrect because as far as I can tell ``replace`` is not an in-place operation for ``chararray`` (it returns a copy). Commenting out this code doesn't cause any tests to fail so I think this code isn't being tested anyway.\n\n\n\n## Additional Context\n\nIt is tested with `astropy/io/fits/tests/test_checksum.py:test_ascii_table_data` but indeed the operation is not inplace and it does not fail. Using 'D' is probably better, but since #5362 (I had vague memory about something like this ^^, see also #5353) anyway 'D' and 'E' are read as double, so I think there is not difference on Astropy side.\n\n## Completed stages\n- **setup**: fail\n  - Script: `git clone https://github.com/astropy/astropy.git . && git checkout c76af9ed6bb89bfba45b9f5bc1e635188278e2fa && python -m pip install -e .[test] --verbose`\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",
     "outcome": "fail",
     "command.stderr": "",
-    "failure_signature": "setup|deterministic|script failed with exit code: <n> ## stdout fatal: destination path '.' already exists and is not an empty directory.",
-    "current_node": "setup"
+    "failure_signature": "solve|transient_infra|api_transient|gemini|rate_limited",
+    "current_node": "solve",
+    "internal.retry_count.solve": 4
   },
   "logs": [],
   "node_outcomes": {
@@ -33,6 +37,15 @@
       "status": "success",
       "duration_ms": 0
     },
+    "solve": {
+      "status": "fail",
+      "failure": {
+        "message": "LLM error: Rate limited by gemini: You exceeded your current quota, please check your plan and billing details. For more information on this error, head to: https://ai.google.dev/gemini-api/docs/rate-limits. To monitor your current usage, head to: https://ai.dev/rate-limit. \n* Quota exceeded for metric: generativelanguage.googleapis.com/generate_requests_per_model, limit: 25, model: gemini-3.1-pro\nPlease retry in 54.063846259s.",
+        "failure_class": "transient_infra",
+        "failure_signature": "api_transient|gemini|rate_limited"
+      },
+      "duration_ms": 128279
+    },
     "setup": {
       "status": "fail",
       "context_updates": {
@@ -46,12 +59,13 @@
       "duration_ms": 19
     }
   },
-  "next_node_id": "solve",
+  "next_node_id": "extract_patch",
   "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": {
     "start": 1,
-    "setup": 1
+    "setup": 1,
+    "solve": 1
   }
 }
\ No newline at end of file
diff --git a/nodes/solve/prompt.md b/nodes/solve/prompt.md
new file mode 100644
index 000000000..12c1c1353
--- /dev/null
+++ b/nodes/solve/prompt.md
@@ -0,0 +1,32 @@
+Goal: Possible bug in io.fits related to D exponents
+I came across the following code in ``fitsrec.py``:
+
+```python
+        # Replace exponent separator in floating point numbers
+        if 'D' in format:
+            output_field.replace(encode_ascii('E'), encode_ascii('D'))
+```
+
+I think this may be incorrect because as far as I can tell ``replace`` is not an in-place operation for ``chararray`` (it returns a copy). Commenting out this code doesn't cause any tests to fail so I think this code isn't being tested anyway.
+
+
+
+## Additional Context
+
+It is tested with `astropy/io/fits/tests/test_checksum.py:test_ascii_table_data` but indeed the operation is not inplace and it does not fail. Using 'D' is probably better, but since #5362 (I had vague memory about something like this ^^, see also #5353) anyway 'D' and 'E' are read as double, so I think there is not difference on Astropy side.
+
+## Completed stages
+- **setup**: fail
+  - Script: `git clone https://github.com/astropy/astropy.git . && git checkout c76af9ed6bb89bfba45b9f5bc1e635188278e2fa && python -m pip install -e .[test] --verbose`
+  - Stdout:
+    ```
+    fatal: destination path '.' already exists and is not an empty directory.
+    ```
+  - Stderr: (empty)
+
+## Context
+- failure_class: deterministic
+- failure_signature: setup|deterministic|script failed with exit code: <n> ## stdout fatal: destination path '.' already exists and is not an empty directory.
+
+
+Fix this GitHub issue in the repository. Make the minimal code change needed.
\ No newline at end of file
diff --git a/nodes/solve/status.json b/nodes/solve/status.json
new file mode 100644
index 000000000..9f3ae759e
--- /dev/null
+++ b/nodes/solve/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "fail",
+  "notes": null,
+  "failure_reason": "LLM error: Rate limited by gemini: You exceeded your current quota, please check your plan and billing details. For more information on this error, head to: https://ai.google.dev/gemini-api/docs/rate-limits. To monitor your current usage, head to: https://ai.dev/rate-limit. \n* Quota exceeded for metric: generativelanguage.googleapis.com/generate_requests_per_model, limit: 25, model: gemini-3.1-pro\nPlease retry in 54.063846259s.",
+  "timestamp": "2026-03-16T12:07:05.934112+00:00"
+}
\ No newline at end of file