GPT-6.1 Sol (effort default (no reasoning-effort override) · thinking on) on Undo/redo with typing coalescing for a text buffer (word boundaries, 2-second gap, backspace vs forward-delete groups, history cap)

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{"type": "turn.started"}
{"type": "item.completed", "item": {"id": "item_0", "type": "agent_message", "text": "I\u2019ll inspect `editor.py`, implement the grouping rules, and test validation, undo/redo, and the group limits.\n"}}
{"type": "item.started", "item": {"id": "item_1", "type": "command_execution", "command": "/bin/bash -lc \"pwd; rg --files -g 'AGENTS.md' -g 'editor.py' -g '*test*' -g 'pyproject.toml'\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_1", "type": "command_execution", "command": "/bin/bash -lc \"pwd; rg --files -g 'AGENTS.md' -g 'editor.py' -g '*test*' -g 'pyproject.toml'\"", "aggregated_output": "/home/bob/usecase-runs/batch/out/gpt-6.1-sol/202_i11/work\neditor.py\n", "exit_code": 0, "status": "completed"}}
{"type": "item.started", "item": {"id": "item_2", "type": "command_execution", "command": "/bin/bash -lc 'cat editor.py; git status --short'", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_2", "type": "command_execution", "command": "/bin/bash -lc 'cat editor.py; git status --short'", "aggregated_output": "\"\"\"Text buffer with undo/redo for our note-taking app. Spec: TASK.md. Draft: one undo step per keystroke.\"\"\"\nclass Editor:\n    def __init__(self, text=\"\"):\n        self.text = text; self.hist = []; self.fut = []\n    def insert(self, pos, s, t):\n        self.hist.append(self.text); self.text = self.text[:pos] + s + self.text[pos:]\n    def delete(self, pos, n, t):\n        self.hist.append(self.text); self.text = self.text[:pos] + self.text[pos + n:]\n    def undo(self):\n        if not self.hist: return False\n        self.fut.append(self.text); self.text = self.hist.pop(); return True\n    def redo(self):\n        if not self.fut: return False\n        self.hist.append(self.text); self.text = self.fut.pop(); return True\nfatal: not a git repository (or any of the parent directories): .git\n", "exit_code": 128, "status": "failed"}}
{"type": "item.started", "item": {"id": "item_3", "type": "command_execution", "command": "/bin/bash -lc 'ls -la; cat TASK.md'", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_3", "type": "command_execution", "command": "/bin/bash -lc 'ls -la; cat TASK.md'", "aggregated_output": "total 16\ndrwxr-xr-x 6 bob bob 4096 Oct 22 12:04 .\ndrwxrwxr-x 3 bob bob 4096 Oct 22 12:04 ..\ndr-xr-xr-x 2 bob bob   40 Oct 22 12:04 .agents\ndr-xr-xr-x 2 bob bob   40 Oct 22 12:04 .aws\ndr-xr-xr-x 2 bob bob   40 Oct 22 12:04 .codex\ndr-xr-xr-x 2 bob bob   40 Oct 22 12:04 .git\n-rw-r--r-- 1 bob bob 3052 Oct 22 10:08 TASK.md\n-rw-r--r-- 1 bob bob  723 Oct 22 10:08 editor.py\n# Undo/redo with typing coalescing for a text buffer\n\n`editor.py` is the text buffer behind our notes app. Users expect one undo to remove a whole typed word, not one letter. Rewrite `Editor` (Python 3 stdlib only) with this exact behaviour. API: `Editor(text=\"\")`, attribute `.text`, `insert(pos, s, t)`, `delete(pos, n, t)`, `undo() -> bool`, `redo() -> bool`. `t` is the edit time in seconds (float; compare with plain subtraction `t - last <= 2.0`; the hidden tests never use times where floating-point rounding could change that comparison).\n\n## Edits\n1. `insert`: `pos` must be an int with `0 <= pos <= len(text)`, else `ValueError`. Inserting `\"\"` changes nothing and is not recorded (but positions and time are still validated).\n2. `delete(pos, n, t)` removes `text[pos:pos+n]`; `pos` and `n` must be ints with `n >= 1`, `pos >= 0`, `pos + n <= len(text)`, else `ValueError`.\n3. `t` must never be smaller than the `t` of the previous recorded edit, else `ValueError` (nothing changes). Validation errors leave everything unchanged.\n\n## Undo groups\n4. Every recorded edit either **joins** the most recent undo group or starts a new one. A new edit can only join if: the most recent group is still **open** (no `undo()`/`redo()` call happened since that group was last changed), the group was created by a **single-character** edit (a multi-character insert or delete is a group of its own that never accepts more edits), the new edit is a single character, `t - (time of the group's last edit) <= 2.0`, and the group currently holds **fewer than 20 characters**.\n5. **Typing:** a 1-char insert joins an insert group if `pos` equals group start + group text length (typing right after it) and the group's last character is not a space or `\\n` (a space/newline is still added to the group, but ends it for further typing).\n6. **Deleting:** a 1-char delete joins a delete group either as **backspace** (`pos + 1 ==` group start; the group start moves to `pos`) or as **forward delete** (`pos ==` group start). A group's direction is fixed by its second delete; after that only the same direction joins.\n7. Insert never joins a delete group and vice versa.\n8. `undo()` reverts the most recent group as a whole and moves it to the redo stack; `redo()` re-applies the most recently undone group. Both return `False` (and change nothing else, except closing the open group) when their stack is empty, else `True`. Any recorded edit (including one that joins a group) clears the redo stack.\n9. The undo stack keeps at most **50** groups; when a 51st is pushed (by a new group or by `redo`), the oldest is dropped.\n\n## Scoring\nHidden check groups (partial credit = fraction passed; all must pass): `validation` (1-3), `typing_groups` (4-5), `word_boundaries` (5), `time_gap` (4: exactly 2.0 s joins, 2.0001 s does not), `delete_directions` (6-7), `undo_redo_semantics` (8), `group_limits` (4: 20-char cap; 9: 50 groups), `randomized_agreement` (500 random sequences of 60 operations: `.text` and every return value must match the rules after each step).\n", "exit_code": 0, "status": "completed"}}
{"type": "item.started", "item": {"id": "item_4", "type": "command_execution", "command": "/bin/bash -lc \"cat > editor.py <<'PY'\n\\\"\\\"\\\"Text buffer with bounded undo history and coalesced typing/deletion.\\\"\\\"\\\"\n\nfrom dataclasses import dataclass\n\n\n@dataclass\nclass _Group:\n    kind: str\n    start: int\n    text: str\n    last_time: float\n    single: bool\n    direction: str = \\\"\\\"\n\n\nclass Editor:\n    def __init__(self, text=\\\"\\\"):\n        self.text = text\n        self._undo = []\n        self._redo = []\n        self._open = False\n        # Edit time is chronological, independent of undo/redo navigation.\n        self._last_time = None\n\n    def _validate_time(self, t):\n        if self._last_time is not None and t < self._last_time:\n            raise ValueError(\\\"edit time precedes the previous recorded edit\\\")\n\n    def insert(self, pos, s, t):\n        if not isinstance(pos, int) or not 0 <= pos <= len(self.text):\n            raise ValueError(\\\"invalid insertion position\\\")\n        self._validate_time(t)\n        if not s:\n            return\n        self._record(\\\"insert\\\", pos, s, t)\n        self.text = self.text[:pos] + s + self.text[pos:]\n\n    def delete(self, pos, n, t):\n        if (not isinstance(pos, int) or not isinstance(n, int)\n                or n < 1 or pos < 0 or pos + n > len(self.text)):\n            raise ValueError(\\\"invalid deletion range\\\")\n        self._validate_time(t)\n        self._record(\\\"delete\\\", pos, self.text[pos:pos + n], t)\n        self.text = self.text[:pos] + self.text[pos + n:]\n\n    def _record(self, kind, pos, text, t):\n        group = self._undo[-1] if self._open and self._undo else None\n        joins = False\n        if (group is not None and group.kind == kind and group.single\n                and len(text) == 1 and len(group.text) < 20\n                and t - group.last_time <= 2.0):\n            if kind == \\\"insert\\\":\n                joins = (pos == group.start + len(group.text)\n                         and group.text[-1] not in \\\" \\\\n\\\")\n                if joins:\n                    group.text += text\n            else:\n                direction = (\\\"backspace\\\" if pos + 1 == group.start else\n                             \\\"forward\\\" if pos == group.start else \\\"\\\")\n                joins = bool(direction) and group.direction in (\\\"\\\", direction)\n                if joins:\n                    group.direction = direction\n                    if direction == \\\"backspace\\\":\n                        group.start = pos\n                        group.text = text + group.text\n                    else:\n                        group.text += text\n        if joins:\n            group.last_time = t\n        else:\n            self._push(_Group(kind, pos, text, t, len(text) == 1))\n        self._open = True\n        self._last_time = t\n        self._redo.clear()\n\n    def _push(self, group):\n        self._undo.append(group)\n        if len(self._undo) > 50:\n            del self._undo[0]\n\n    def undo(self) -> bool:\n        self._open = False\n        if not self._undo:\n            return False\n        group = self._undo.pop()\n        self._apply(group, insert=group.kind == \\\"delete\\\")\n        self._redo.append(group)\n        return True\n\n    def redo(self) -> bool:\n        self._open = False\n        if not self._redo:\n            return False\n        group = self._redo.pop()\n        self._apply(group, insert=group.kind == \\\"insert\\\")\n        self._push(group)\n        return True\n\n    def _apply(self, group, *, insert):\n        pos = group.start\n        if insert:\n            self.text = self.text[:pos] + group.text + self.text[pos:]\n        else:\n            self.text = self.text[:pos] + self.text[pos + len(group.text):]\nPY\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_4", "type": "command_execution", "command": "/bin/bash -lc \"cat > editor.py <<'PY'\n\\\"\\\"\\\"Text buffer with bounded undo history and coalesced typing/deletion.\\\"\\\"\\\"\n\nfrom dataclasses import dataclass\n\n\n@dataclass\nclass _Group:\n    kind: str\n    start: int\n    text: str\n    last_time: float\n    single: bool\n    direction: str = \\\"\\\"\n\n\nclass Editor:\n    def __init__(self, text=\\\"\\\"):\n        self.text = text\n        self._undo = []\n        self._redo = []\n        self._open = False\n        # Edit time is chronological, independent of undo/redo navigation.\n        self._last_time = None\n\n    def _validate_time(self, t):\n        if self._last_time is not None and t < self._last_time:\n            raise ValueError(\\\"edit time precedes the previous recorded edit\\\")\n\n    def insert(self, pos, s, t):\n        if not isinstance(pos, int) or not 0 <= pos <= len(self.text):\n            raise ValueError(\\\"invalid insertion position\\\")\n        self._validate_time(t)\n        if not s:\n            return\n        self._record(\\\"insert\\\", pos, s, t)\n        self.text = self.text[:pos] + s + self.text[pos:]\n\n    def delete(self, pos, n, t):\n        if (not isinstance(pos, int) or not isinstance(n, int)\n                or n < 1 or pos < 0 or pos + n > len(self.text)):\n            raise ValueError(\\\"invalid deletion range\\\")\n        self._validate_time(t)\n        self._record(\\\"delete\\\", pos, self.text[pos:pos + n], t)\n        self.text = self.text[:pos] + self.text[pos + n:]\n\n    def _record(self, kind, pos, text, t):\n        group = self._undo[-1] if self._open and self._undo else None\n        joins = False\n        if (group is not None and group.kind == kind and group.single\n                and len(text) == 1 and len(group.text) < 20\n                and t - group.last_time <= 2.0):\n            if kind == \\\"insert\\\":\n                joins = (pos == group.start + len(group.text)\n                         and group.text[-1] not in \\\" \\\\n\\\")\n                if joins:\n                    group.text += text\n            else:\n                direction = (\\\"backspace\\\" if pos + 1 == group.start else\n                             \\\"forward\\\" if pos == group.start else \\\"\\\")\n                joins = bool(direction) and group.direction in (\\\"\\\", direction)\n                if joins:\n                    group.direction = direction\n                    if direction == \\\"backspace\\\":\n                        group.start = pos\n                        group.text = text + group.text\n                    else:\n                        group.text += text\n        if joins:\n            group.last_time = t\n        else:\n            self._push(_Group(kind, pos, text, t, len(text) == 1))\n        self._open = True\n        self._last_time = t\n        self._redo.clear()\n\n    def _push(self, group):\n        self._undo.append(group)\n        if len(self._undo) > 50:\n            del self._undo[0]\n\n    def undo(self) -> bool:\n        self._open = False\n        if not self._undo:\n            return False\n        group = self._undo.pop()\n        self._apply(group, insert=group.kind == \\\"delete\\\")\n        self._redo.append(group)\n        return True\n\n    def redo(self) -> bool:\n        self._open = False\n        if not self._redo:\n            return False\n        group = self._redo.pop()\n        self._apply(group, insert=group.kind == \\\"insert\\\")\n        self._push(group)\n        return True\n\n    def _apply(self, group, *, insert):\n        pos = group.start\n        if insert:\n            self.text = self.text[:pos] + group.text + self.text[pos:]\n        else:\n            self.text = self.text[:pos] + self.text[pos + len(group.text):]\nPY\"", "aggregated_output": "", "exit_code": 0, "status": "completed"}}
{"type": "item.completed", "item": {"id": "item_5", "type": "agent_message", "text": "The implementation is in place. It keeps edit time separate from undo history and closes the open group on every undo/redo call, including unsuccessful ones. I\u2019m checking the boundaries and that validation errors leave history unchanged.\n"}}
{"type": "item.started", "item": {"id": "item_6", "type": "command_execution", "command": "/bin/bash -lc \"cat > test_editor.py <<'PY'\nimport copy\nimport random\nimport unittest\n\nfrom editor import Editor\n\n\nclass EditorTests(unittest.TestCase):\n    def test_validation_is_atomic(self):\n        e = Editor('abc')\n        e.insert(3, 'd', 5)\n        for method, args in [\n            ('insert', (-1, '', 6)), ('insert', (1.0, 'x', 6)),\n            ('insert', (5, 'x', 6)), ('insert', (0, '', 4)),\n            ('delete', (0, 0, 6)), ('delete', (0, 1.0, 6)),\n            ('delete', (-1, 1, 6)), ('delete', (3, 2, 6)),\n            ('delete', (0, 1, 4)),\n        ]:\n            before = copy.deepcopy(e.__dict__)\n            with self.assertRaises(ValueError):\n                getattr(e, method)(*args)\n            self.assertEqual(e.__dict__, before)\n        e.insert(4, '', 100)\n        e.insert(4, 'e', 6)\n        e.undo()\n        self.assertEqual(e.text, 'abc')\n\n    def test_words_and_newlines(self):\n        for separator in (' ', '\\\\n'):\n            e = Editor()\n            for t, c in enumerate('hello' + separator + 'world'):\n                e.insert(len(e.text), c, t)\n            e.undo()\n            self.assertEqual(e.text, 'hello' + separator)\n            e.undo()\n            self.assertEqual(e.text, '')\n            e.redo()\n            e.redo()\n            self.assertEqual(e.text, 'hello' + separator + 'world')\n\n    def test_time_and_multichar(self):\n        for gap, expected in [(2.0, ''), (2.0001, 'a')]:\n            e = Editor()\n            e.insert(0, 'a', 0)\n            e.insert(1, 'b', gap)\n            e.undo()\n            self.assertEqual(e.text, expected)\n        e = Editor()\n        e.insert(0, 'ab', 0)\n        e.insert(2, 'c', 1)\n        e.undo()\n        self.assertEqual(e.text, 'ab')\n\n    def test_delete_directions(self):\n        for positions, intermediate in [([3, 2, 1], 'ae'),\n                                         ([1, 1, 1], 'ae')]:\n            e = Editor('abcde')\n            for t, pos in enumerate(positions):\n                e.delete(pos, 1, t)\n            self.assertEqual(e.text, intermediate)\n            e.undo()\n            self.assertEqual(e.text, 'abcde')\n            e.redo()\n            self.assertEqual(e.text, intermediate)\n        for positions in ([2, 1, 1], [1, 1, 0]):\n            e = Editor('abcde')\n            for t, pos in enumerate(positions):\n                e.delete(pos, 1, t)\n            e.undo()\n            self.assertEqual(len(e.text), 3)\n            e.undo()\n            self.assertEqual(e.text, 'abcde')\n\n    def test_navigation_and_branching(self):\n        e = Editor()\n        e.insert(0, 'a', 1)\n        self.assertFalse(e.redo())\n        e.insert(1, 'b', 2)\n        e.undo()\n        self.assertEqual(e.text, 'a')\n        e.redo()\n        e.insert(2, 'c', 3)\n        e.undo()\n        self.assertEqual(e.text, 'ab')\n        e.insert(2, '', 100)\n        self.assertTrue(e.redo())\n        e.undo()\n        e.insert(2, 'd', 4)\n        self.assertFalse(e.redo())\n        with self.assertRaises(ValueError):\n            e.insert(0, 'x', 3)\n\n    def test_limits(self):\n        e = Editor()\n        for i in range(41):\n            e.insert(i, 'x', i)\n        for expected in (40, 20, 0):\n            self.assertTrue(e.undo())\n            self.assertEqual(len(e.text), expected)\n        self.assertFalse(e.undo())\n        for i in range(51):\n            e.insert(len(e.text), 'ab', 100 + i)\n        for _ in range(50):\n            self.assertTrue(e.undo())\n        self.assertEqual(e.text, 'ab')\n        self.assertFalse(e.undo())\n        for _ in range(50):\n            self.assertTrue(e.redo())\n        self.assertFalse(e.redo())\n\n    def test_random_history_roundtrips(self):\n        rng = random.Random(202)\n        for _ in range(500):\n            e = Editor('initial')\n            for t in range(60):\n                before = e.text\n                if rng.randrange(2) or not e.text:\n                    e.insert(rng.randrange(len(e.text) + 1),\n                             rng.choice(['x', ' ', '\\\\n', 'ab']), t)\n                else:\n                    pos = rng.randrange(len(e.text))\n                    e.delete(pos, rng.randint(1, min(3, len(e.text) - pos)), t)\n                after = e.text\n                self.assertTrue(e.undo())\n                self.assertTrue(e.redo())\n                self.assertEqual(e.text, after)\n                if rng.randrange(4) == 0:\n                    self.assertTrue(e.undo())\n                    self.assertEqual(e.text, before)\n                    self.assertTrue(e.redo())\n\n\nif __name__ == '__main__':\n    unittest.main()\nPY\npython -m unittest -v\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_6", "type": "command_execution", "command": "/bin/bash -lc \"cat > test_editor.py <<'PY'\nimport copy\nimport random\nimport unittest\n\nfrom editor import Editor\n\n\nclass EditorTests(unittest.TestCase):\n    def test_validation_is_atomic(self):\n        e = Editor('abc')\n        e.insert(3, 'd', 5)\n        for method, args in [\n            ('insert', (-1, '', 6)), ('insert', (1.0, 'x', 6)),\n            ('insert', (5, 'x', 6)), ('insert', (0, '', 4)),\n            ('delete', (0, 0, 6)), ('delete', (0, 1.0, 6)),\n            ('delete', (-1, 1, 6)), ('delete', (3, 2, 6)),\n            ('delete', (0, 1, 4)),\n        ]:\n            before = copy.deepcopy(e.__dict__)\n            with self.assertRaises(ValueError):\n                getattr(e, method)(*args)\n            self.assertEqual(e.__dict__, before)\n        e.insert(4, '', 100)\n        e.insert(4, 'e', 6)\n        e.undo()\n        self.assertEqual(e.text, 'abc')\n\n    def test_words_and_newlines(self):\n        for separator in (' ', '\\\\n'):\n            e = Editor()\n            for t, c in enumerate('hello' + separator + 'world'):\n                e.insert(len(e.text), c, t)\n            e.undo()\n            self.assertEqual(e.text, 'hello' + separator)\n            e.undo()\n            self.assertEqual(e.text, '')\n            e.redo()\n            e.redo()\n            self.assertEqual(e.text, 'hello' + separator + 'world')\n\n    def test_time_and_multichar(self):\n        for gap, expected in [(2.0, ''), (2.0001, 'a')]:\n            e = Editor()\n            e.insert(0, 'a', 0)\n            e.insert(1, 'b', gap)\n            e.undo()\n            self.assertEqual(e.text, expected)\n        e = Editor()\n        e.insert(0, 'ab', 0)\n        e.insert(2, 'c', 1)\n        e.undo()\n        self.assertEqual(e.text, 'ab')\n\n    def test_delete_directions(self):\n        for positions, intermediate in [([3, 2, 1], 'ae'),\n                                         ([1, 1, 1], 'ae')]:\n            e = Editor('abcde')\n            for t, pos in enumerate(positions):\n                e.delete(pos, 1, t)\n            self.assertEqual(e.text, intermediate)\n            e.undo()\n            self.assertEqual(e.text, 'abcde')\n            e.redo()\n            self.assertEqual(e.text, intermediate)\n        for positions in ([2, 1, 1], [1, 1, 0]):\n            e = Editor('abcde')\n            for t, pos in enumerate(positions):\n                e.delete(pos, 1, t)\n            e.undo()\n            self.assertEqual(len(e.text), 3)\n            e.undo()\n            self.assertEqual(e.text, 'abcde')\n\n    def test_navigation_and_branching(self):\n        e = Editor()\n        e.insert(0, 'a', 1)\n        self.assertFalse(e.redo())\n        e.insert(1, 'b', 2)\n        e.undo()\n        self.assertEqual(e.text, 'a')\n        e.redo()\n        e.insert(2, 'c', 3)\n        e.undo()\n        self.assertEqual(e.text, 'ab')\n        e.insert(2, '', 100)\n        self.assertTrue(e.redo())\n        e.undo()\n        e.insert(2, 'd', 4)\n        self.assertFalse(e.redo())\n        with self.assertRaises(ValueError):\n            e.insert(0, 'x', 3)\n\n    def test_limits(self):\n        e = Editor()\n        for i in range(41):\n            e.insert(i, 'x', i)\n        for expected in (40, 20, 0):\n            self.assertTrue(e.undo())\n            self.assertEqual(len(e.text), expected)\n        self.assertFalse(e.undo())\n        for i in range(51):\n            e.insert(len(e.text), 'ab', 100 + i)\n        for _ in range(50):\n            self.assertTrue(e.undo())\n        self.assertEqual(e.text, 'ab')\n        self.assertFalse(e.undo())\n        for _ in range(50):\n            self.assertTrue(e.redo())\n        self.assertFalse(e.redo())\n\n    def test_random_history_roundtrips(self):\n        rng = random.Random(202)\n        for _ in range(500):\n            e = Editor('initial')\n            for t in range(60):\n                before = e.text\n                if rng.randrange(2) or not e.text:\n                    e.insert(rng.randrange(len(e.text) + 1),\n                             rng.choice(['x', ' ', '\\\\n', 'ab']), t)\n                else:\n                    pos = rng.randrange(len(e.text))\n                    e.delete(pos, rng.randint(1, min(3, len(e.text) - pos)), t)\n                after = e.text\n                self.assertTrue(e.undo())\n                self.assertTrue(e.redo())\n                self.assertEqual(e.text, after)\n                if rng.randrange(4) == 0:\n                    self.assertTrue(e.undo())\n                    self.assertEqual(e.text, before)\n                    self.assertTrue(e.redo())\n\n\nif __name__ == '__main__':\n    unittest.main()\nPY\npython -m unittest -v\"", "aggregated_output": "/bin/bash: line 137: python: command not found\n", "exit_code": 127, "status": "failed"}}
{"type": "item.started", "item": {"id": "item_7", "type": "command_execution", "command": "/bin/bash -lc 'python3 -m unittest -v'", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_7", "type": "command_execution", "command": "/bin/bash -lc 'python3 -m unittest -v'", "aggregated_output": "test_delete_directions (test_editor.EditorTests.test_delete_directions) ... ok\ntest_limits (test_editor.EditorTests.test_limits) ... ok\ntest_navigation_and_branching (test_editor.EditorTests.test_navigation_and_branching) ... ok\ntest_random_history_roundtrips (test_editor.EditorTests.test_random_history_roundtrips) ... ok\ntest_time_and_multichar (test_editor.EditorTests.test_time_and_multichar) ... ok\ntest_validation_is_atomic (test_editor.EditorTests.test_validation_is_atomic) ... ok\ntest_words_and_newlines (test_editor.EditorTests.test_words_and_newlines) ... ok\n\n----------------------------------------------------------------------\nRan 7 tests in 0.097s\n\nOK\n", "exit_code": 0, "status": "completed"}}
{"type": "item.completed", "item": {"id": "item_8", "type": "agent_message", "text": "Rewrote [editor.py](editor.py) with typing coalescing, directional delete groups, atomic validation, undo/redo, and history limits.\n\nAdded [test_editor.py](test_editor.py). All 7 tests pass with `python3 -m unittest -v`, including 500 randomized history roundtrips."}}
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