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+# ImGui Context Manager Suite Design
+
+## Status
+
+Proposed — 2026-05-11
+
+## Context
+
+The `src/gui_2.py` file contains ~50 `imgui.begin()` / `imgui.end()` pairs scattered across 5900+ lines. Dear PyGui (and ImGui) uses a procedural API where every `begin_X()` requires a matching `end_X()`. This creates two problems:
+
+1. **Error-prone for AI agents** — forgetting an `end()` call causes UI nesting bugs that are hard to trace
+2. **Visual sprawl** — the begin/end pairing is separated by potentially hundreds of lines, making scope boundaries unclear
+
+## Decision
+
+Implement a context manager suite that pairs `begin` and `end` calls on the same line using Python's `with` statement.
+
+## Implementation
+
+### Core Base Class
+
+```python
+class ImGuiScope:
+    def __init__(self, begin_fn, end_fn, *args, **kwargs):
+        self._begin_fn = begin_fn
+        self._end_fn = end_fn
+        self._args = args
+        self._kwargs = kwargs
+        self._opened = None
+        self._entered = False
+
+    def __enter__(self):
+        result = self._begin_fn(*self._args, **self._kwargs)
+        if isinstance(result, tuple):
+            self._opened = result[0]
+        else:
+            self._opened = result
+        self._entered = bool(self._opened)
+        return self._opened
+
+    def __exit__(self, *args):
+        if self._entered:
+            self._end_fn()
+        return False
+```
+
+### Scope Helpers
+
+| Function | Wraps | Signature |
+|----------|-------|-----------|
+| `imgui_window(name, visible=True, flags=0)` | `imgui.begin` | `__enter__` returns `opened` bool |
+| `imgui_table(name, columns, flags=0)` | `imgui.begin_table` | `__enter__` returns `opened` bool |
+| `imgui_menu_bar()` | `imgui.begin_menu_bar` | No args |
+| `imgui_menu(label)` | `imgui.begin_menu` | `__enter__` returns `opened` bool |
+| `imgui_child(id, width=0, height=0, flags=0)` | `imgui.begin_child` | `__enter__` returns `opened` bool |
+| `imgui_group()` | `imgui.begin_group` | No args |
+| `imgui_popup(id)` | `imgui.begin_popup` | `__enter__` returns `opened` bool |
+| `imgui_tooltip()` | `imgui.begin_tooltip` | No args |
+| `imgui_clipper(count)` | `clipper.begin` | `__enter__` returns `opened` count |
+| `node_editor_scope(name)` | `ed.begin` | `__enter__` returns `opened` bool |
+
+### Usage Pattern
+
+```python
+# Before
+exp, opened = imgui.begin("AI Settings", self.show_windows["AI Settings"])
+if exp:
+    imgui.text("Settings")
+    imgui.separator()
+    # ... 50 more lines ...
+    imgui.end()
+
+# After
+if imgui_window("AI Settings", self.show_windows["AI Settings"], flags):
+    imgui.text("Settings")
+    imgui.separator()
+    # ... 50 more lines ...
+# imgui.end() called automatically
+```
+
+## File Location
+
+`src/imgui_scopes.py`
+
+## Migration Strategy
+
+1. New code MUST use context managers
+2. Existing code migrates incrementally during bug fixes and feature work
+3. No强制性 — old `begin()`/`end()` calls remain valid
+
+## Consequences
+
+- **Reduced** scope pairing errors
+- **Improved** code legibility for AI agents
+- **Slight** line count reduction (one `imgui.end()` line saved per scope)
+- **No** runtime performance impact (imperceptible nanoseconds vs C++ binding calls)
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