fix: strip codex user file mention wrappers

Codex-Thread-ID: https://jieli.app/threads/T-019ea91c-c153-7dc1-8d50-4fdc2ee9b7e0

Author: burugo

plugins/codex/.codex-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "codex",
-  "version": "0.1.0+codex.20260609102652",
+  "version": "0.1.0+codex.20260610092530",
   "description": "Sync Codex sessions to Jieli threads and attach Jieli thread trailers to Codex-created commits.",
   "author": {
     "name": "Jieli"

plugins/codex/scripts/sync.py

@@ -37,6 +37,10 @@
 LOCAL_MARKDOWN_LINK_RE = re.compile(r"\[([^\]]+)\]\((/[^)\n]+)\)")
 HANDOFF_SUMMARY_RE = re.compile(r"^(?:#{1,6}\s*)?\*{0,2}Handoff Summary\*{0,2}\s*(?:\n|$)", re.IGNORECASE)
 CODEX_GIT_DIRECTIVE_RE = re.compile(r"(?m)^[ \t]*::git-[A-Za-z0-9_-]+\{[^\n]*\}[ \t]*\n?")
+CODEX_USER_FILE_MENTIONS_RE = re.compile(
+    r"\A\s*#{0,6}\s*Files mentioned by the user:\s*\n.*?^\s*#{0,6}\s*My request for Codex:\s*\n?",
+    re.DOTALL | re.MULTILINE,
+)
 SUPPORTED_IMAGE_MEDIA_TYPES = {"image/png", "image/jpeg", "image/gif", "image/webp"}
 COMPACTION_PLACEHOLDER = (
     "[Context compacted - earlier conversation summarized to continue past the context window]"
@@ -355,6 +359,8 @@ def normalize_content_blocks(
     data_image_uploader: DataImageUploader | None = None,
 ) -> Any | None:
     if isinstance(raw_content, str):
+        if role == "user":
+            raw_content = clean_codex_user_text(raw_content)
         return normalize_text_with_images(raw_content, image_uploader)
     if not isinstance(raw_content, list):
         if raw_content is None:
@@ -368,6 +374,8 @@ def normalize_content_blocks(
         block_type = str(block.get("type") or "")
         text = block.get("text")
         if block_type in {"input_text", "output_text", "text"} and isinstance(text, str):
+            if role == "user":
+                text = clean_codex_user_text(text)
             append_blocks(blocks, normalize_text_blocks(text, image_uploader))
             continue
         if block_type == "input_image":
@@ -397,7 +405,7 @@ def normalize_content_blocks(
 
 
 def normalize_user_event_content(message: str, local_images: Any, image_uploader: ImageUploader | None = None) -> Any | None:
-    blocks = normalize_text_blocks(message, image_uploader)
+    blocks = normalize_text_blocks(clean_codex_user_text(message), image_uploader)
     if isinstance(local_images, list):
         for image_path in local_images:
             if not isinstance(image_path, str):
@@ -575,6 +583,10 @@ def clean_codex_text(text: str) -> str:
     return re.sub(r"\n{3,}", "\n\n", cleaned)
 
 
+def clean_codex_user_text(text: str) -> str:
+    return clean_codex_text(CODEX_USER_FILE_MENTIONS_RE.sub("", text, count=1))
+
+
 def file_url_local_markdown_link_targets(text: str) -> str:
     def replace(match: re.Match[str]) -> str:
         label = match.group(1).strip()

plugins/codex/tests/test_plugin_scripts.py

@@ -586,6 +586,49 @@ def test_build_payload_skips_loaded_skill_content_block(self):
         self.assertNotIn("Spec-Driven Planning", raw_payload)
         self.assertNotIn("SKILL.md", raw_payload)
 
+    def test_build_payload_strips_codex_user_file_mentions_prefix(self):
+        from sync import build_payload_from_hook
+
+        user_text = """# Files mentioned by the user:
+
+## codex-clipboard-ba43ae37-fd1b-46d2-98dc-a3f3e3c14b3e.png: /var/folders/2s/q99hddf140l937t46th4b91w0000gn/T/codex-clipboard-ba43ae37-fd1b-46d2-98dc-a3f3e3c14b3e.png
+
+## My request for Codex:
+threads list, hidden branch name, just show repo"""
+        with tempfile.TemporaryDirectory() as tmpdir:
+            transcript = Path(tmpdir) / "session.jsonl"
+            transcript.write_text(
+                "\n".join(
+                    [
+                        json.dumps({"type": "session_meta", "payload": {"id": "codex-file-prefix", "cwd": "/Users/alice/work/jieli"}}),
+                        json.dumps(
+                            {
+                                "type": "response_item",
+                                "payload": {
+                                    "type": "message",
+                                    "role": "user",
+                                    "content": [{"type": "input_text", "text": user_text}],
+                                },
+                            }
+                        ),
+                    ]
+                )
+                + "\n",
+                encoding="utf-8",
+            )
+
+            payload = build_payload_from_hook(
+                {"session_id": "codex-file-prefix", "transcript_path": str(transcript)},
+                base_url="https://jieli.example.test",
+            )
+
+        raw_payload = json.dumps(payload, ensure_ascii=False)
+        self.assertEqual(payload["thread"]["messages"][0]["content"], "threads list, hidden branch name, just show repo")
+        self.assertEqual(payload["thread"]["title"], "threads list, hidden branch name, just show repo")
+        self.assertNotIn("Files mentioned by the user", raw_payload)
+        self.assertNotIn("codex-clipboard-ba43ae37", raw_payload)
+        self.assertNotIn("/var/folders/", raw_payload)
+
     def test_build_payload_rewrites_local_markdown_link_targets_as_file_urls(self):
         from sync import build_payload_from_hook