diff --git a/scripts/repair_workspace_user_turns.py b/scripts/repair_workspace_user_turns.py
new file mode 100644
index 00000000..a4080720
--- /dev/null
+++ b/scripts/repair_workspace_user_turns.py
@@ -0,0 +1,187 @@
+#!/usr/bin/env python3
+"""Repair workspace-prefixed and duplicated user turns in WebUI transcripts.
+
+WebUI may store model-facing user messages prefixed with
+``[Workspace: /path]``. That prefix is useful for the model, but it should not
+remain in display transcripts. Older data can also contain adjacent duplicate
+user bubbles when a display turn and a workspace-prefixed model turn were merged
+as separate messages.
+
+This script cleans those historical artifacts in WebUI sidecar JSON files and,
+when requested, the SQLite session database.
+"""
+from __future__ import annotations
+
+import argparse
+import datetime as _dt
+import json
+import re
+import shutil
+import sqlite3
+from pathlib import Path
+from typing import Any
+
+_WORKSPACE_PREFIX_RE = re.compile(r"^\s*\[Workspace:[^\]]+\]\s*")
+
+
+def strip_workspace_prefix(text: str | None) -> str:
+    """Return user text without WebUI's model-facing workspace prefix."""
+    return _WORKSPACE_PREFIX_RE.sub("", str(text or "")).strip()
+
+
+def normalized_text(text: str | None) -> str:
+    return " ".join(strip_workspace_prefix(text).split())
+
+
+def clean_message_list(messages: list[dict[str, Any]]) -> tuple[list[dict[str, Any]], dict[str, int]]:
+    """Strip workspace prefixes and remove adjacent duplicate user turns."""
+    cleaned: list[dict[str, Any]] = []
+    stats = {"stripped_workspace_prefixes": 0, "removed_adjacent_user_duplicates": 0}
+
+    for message in messages:
+        if not isinstance(message, dict):
+            cleaned.append(message)
+            continue
+
+        next_message = dict(message)
+        if next_message.get("role") == "user":
+            original = str(next_message.get("content") or "")
+            stripped = strip_workspace_prefix(original)
+            if stripped and stripped != original:
+                next_message["content"] = stripped
+                stats["stripped_workspace_prefixes"] += 1
+
+            if cleaned and isinstance(cleaned[-1], dict) and cleaned[-1].get("role") == "user":
+                previous_text = normalized_text(str(cleaned[-1].get("content") or ""))
+                current_text = normalized_text(str(next_message.get("content") or ""))
+                if previous_text and previous_text == current_text:
+                    stats["removed_adjacent_user_duplicates"] += 1
+                    continue
+
+        cleaned.append(next_message)
+
+    return cleaned, stats
+
+
+def _backup_file(path: Path, backup_dir: Path) -> None:
+    backup_dir.mkdir(parents=True, exist_ok=True)
+    shutil.copy2(path, backup_dir / path.name)
+
+
+def repair_sidecars(sessions_dir: Path, backup_dir: Path | None = None, dry_run: bool = False) -> dict[str, Any]:
+    changed: list[dict[str, Any]] = []
+    for path in sorted(sessions_dir.glob("*.json")):
+        if path.name == "_index.json":
+            continue
+        try:
+            data = json.loads(path.read_text(encoding="utf-8"))
+        except json.JSONDecodeError:
+            continue
+        messages = data.get("messages")
+        if not isinstance(messages, list):
+            continue
+        cleaned, stats = clean_message_list(messages)
+        if stats["stripped_workspace_prefixes"] or stats["removed_adjacent_user_duplicates"]:
+            changed.append({"file": path.name, **stats, "messages_after": len(cleaned)})
+            if not dry_run:
+                if backup_dir is not None:
+                    _backup_file(path, backup_dir)
+                data["messages"] = cleaned
+                data["message_count"] = len(cleaned)
+                path.write_text(json.dumps(data, ensure_ascii=False, indent=2) + "\n", encoding="utf-8")
+    return {"changed_sidecars": changed}
+
+
+def repair_state_db(state_db: Path, backup_dir: Path | None = None, dry_run: bool = False) -> dict[str, Any]:
+    if not state_db.exists():
+        return {"updated_workspace_prefix_user_messages": 0, "removed_adjacent_user_duplicates": 0}
+    if not dry_run and backup_dir is not None:
+        _backup_file(state_db, backup_dir)
+        for suffix in ("-wal", "-shm"):
+            extra = Path(str(state_db) + suffix)
+            if extra.exists():
+                _backup_file(extra, backup_dir)
+
+    con = sqlite3.connect(state_db)
+    con.row_factory = sqlite3.Row
+    updated = 0
+    deleted = 0
+    affected_sessions: set[str] = set()
+    try:
+        rows = con.execute(
+            "select id, session_id, content from messages "
+            "where role = 'user' and content like '[Workspace:%' order by session_id, id"
+        ).fetchall()
+        duplicate_ids: list[int] = []
+        for row in rows:
+            stripped = strip_workspace_prefix(row["content"])
+            if stripped and stripped != row["content"]:
+                updated += 1
+                affected_sessions.add(row["session_id"])
+                if not dry_run:
+                    con.execute("update messages set content = ? where id = ?", (stripped, row["id"]))
+
+        for sid_row in con.execute("select distinct session_id from messages order by session_id").fetchall():
+            sid = sid_row["session_id"]
+            previous = None
+            for row in con.execute("select id, role, content from messages where session_id = ? order by id", (sid,)).fetchall():
+                if previous and previous["role"] == "user" and row["role"] == "user":
+                    if normalized_text(previous["content"]) and normalized_text(previous["content"]) == normalized_text(row["content"]):
+                        duplicate_ids.append(row["id"])
+                        affected_sessions.add(sid)
+                        continue
+                previous = row
+
+        deleted = len(duplicate_ids)
+        if not dry_run:
+            for message_id in duplicate_ids:
+                con.execute("delete from messages where id = ?", (message_id,))
+            for sid in sorted(affected_sessions):
+                message_count = con.execute("select count(*) from messages where session_id = ?", (sid,)).fetchone()[0]
+                tool_count = con.execute(
+                    "select count(*) from messages where session_id = ? and role = 'tool'", (sid,)
+                ).fetchone()[0]
+                con.execute(
+                    "update sessions set message_count = ?, tool_call_count = ? where id = ?",
+                    (message_count, tool_count, sid),
+                )
+            con.commit()
+    finally:
+        con.close()
+
+    return {
+        "updated_workspace_prefix_user_messages": updated,
+        "removed_adjacent_user_duplicates": deleted,
+        "affected_sessions": sorted(affected_sessions),
+    }
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--sessions-dir", type=Path, help="WebUI sidecar session directory")
+    parser.add_argument("--state-db", type=Path, help="Hermes SQLite state.db path")
+    parser.add_argument("--backup-dir", type=Path, help="Directory for backups before mutation")
+    parser.add_argument("--dry-run", action="store_true", help="Report changes without writing")
+    args = parser.parse_args()
+
+    if not args.sessions_dir and not args.state_db:
+        parser.error("provide --sessions-dir, --state-db, or both")
+
+    backup_dir = args.backup_dir
+    if backup_dir is None and not args.dry_run:
+        backup_dir = Path("backups") / f"workspace-user-turn-repair-{_dt.datetime.now().strftime('%Y%m%d_%H%M%S')}"
+
+    report: dict[str, Any] = {"dry_run": args.dry_run}
+    if backup_dir is not None:
+        report["backup_dir"] = str(backup_dir)
+    if args.sessions_dir:
+        report.update(repair_sidecars(args.sessions_dir, backup_dir, args.dry_run))
+    if args.state_db:
+        report["state_db"] = repair_state_db(args.state_db, backup_dir, args.dry_run)
+
+    print(json.dumps(report, ensure_ascii=False, indent=2))
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/tests/test_repair_workspace_user_turns.py b/tests/test_repair_workspace_user_turns.py
new file mode 100644
index 00000000..d84aa474
--- /dev/null
+++ b/tests/test_repair_workspace_user_turns.py
@@ -0,0 +1,91 @@
+import importlib.util
+import json
+import sqlite3
+from pathlib import Path
+
+
+SCRIPT = Path(__file__).resolve().parents[1] / "scripts" / "repair_workspace_user_turns.py"
+spec = importlib.util.spec_from_file_location("repair_workspace_user_turns", SCRIPT)
+repair = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(repair)
+
+
+def test_clean_message_list_strips_workspace_prefix_and_dedupes_adjacent_user_turns():
+    cleaned, stats = repair.clean_message_list([
+        {"role": "user", "content": "Ok, mache weiter"},
+        {"role": "user", "content": "[Workspace: /tmp/project]\nOk, mache weiter"},
+        {"role": "assistant", "content": "continuing"},
+        {"role": "user", "content": "[Workspace: /tmp/project]\nNext"},
+    ])
+
+    assert stats == {"stripped_workspace_prefixes": 2, "removed_adjacent_user_duplicates": 1}
+    assert [m["role"] for m in cleaned] == ["user", "assistant", "user"]
+    assert [m["content"] for m in cleaned] == ["Ok, mache weiter", "continuing", "Next"]
+
+
+def test_repair_sidecars_writes_backup_and_updates_message_count(tmp_path):
+    sessions_dir = tmp_path / "sessions"
+    backup_dir = tmp_path / "backup"
+    sessions_dir.mkdir()
+    sidecar = sessions_dir / "abc.json"
+    sidecar.write_text(json.dumps({
+        "session_id": "abc",
+        "message_count": 3,
+        "messages": [
+            {"role": "user", "content": "ping"},
+            {"role": "user", "content": "[Workspace: /tmp]\nping"},
+            {"role": "assistant", "content": "pong"},
+        ],
+    }), encoding="utf-8")
+
+    report = repair.repair_sidecars(sessions_dir, backup_dir=backup_dir, dry_run=False)
+
+    assert report["changed_sidecars"][0]["removed_adjacent_user_duplicates"] == 1
+    updated = json.loads(sidecar.read_text(encoding="utf-8"))
+    assert updated["message_count"] == 2
+    assert [m["content"] for m in updated["messages"]] == ["ping", "pong"]
+    assert (backup_dir / "abc.json").exists()
+
+
+def test_repair_state_db_strips_prefixes_deletes_duplicates_and_updates_counts(tmp_path):
+    db = tmp_path / "state.db"
+    con = sqlite3.connect(db)
+    con.executescript("""
+        create table sessions (
+            id text primary key,
+            message_count integer default 0,
+            tool_call_count integer default 0
+        );
+        create table messages (
+            id integer primary key autoincrement,
+            session_id text not null,
+            role text not null,
+            content text,
+            tool_name text
+        );
+    """)
+    con.execute("insert into sessions(id, message_count, tool_call_count) values ('s1', 4, 1)")
+    con.executemany(
+        "insert into messages(session_id, role, content, tool_name) values (?, ?, ?, ?)",
+        [
+            ("s1", "user", "hello", None),
+            ("s1", "user", "[Workspace: /tmp]\nhello", None),
+            ("s1", "assistant", "hi", None),
+            ("s1", "tool", "{}", "read_file"),
+        ],
+    )
+    con.commit()
+    con.close()
+
+    report = repair.repair_state_db(db, backup_dir=tmp_path / "backup", dry_run=False)
+
+    assert report["updated_workspace_prefix_user_messages"] == 1
+    assert report["removed_adjacent_user_duplicates"] == 1
+    con = sqlite3.connect(db)
+    assert con.execute("select message_count, tool_call_count from sessions where id = 's1'").fetchone() == (3, 1)
+    assert con.execute("select role, content from messages order by id").fetchall() == [
+        ("user", "hello"),
+        ("assistant", "hi"),
+        ("tool", "{}"),
+    ]
+    con.close()