diff --git a/runtime/chat/history_tool_result_compact.py b/runtime/chat/history_tool_result_compact.py
index 995eb27e..02179314 100644
--- a/runtime/chat/history_tool_result_compact.py
+++ b/runtime/chat/history_tool_result_compact.py
@@ -25,6 +25,13 @@ class HistoryCompactionResult:
     detail: str = ""
 
 
+def _chat_message_id_content(row: Any) -> tuple[int, str]:
+    """Normalize SQLite Row/tuple vs PostgreSQL dict_row for ``select id, content``."""
+    if isinstance(row, dict):
+        return int(row["id"]), str(row.get("content") or "")
+    return int(row[0]), str(row[1] or "")  # type: ignore[index]
+
+
 def _json_dumps_safe(obj: Any) -> str:
     try:
         return json.dumps(obj, ensure_ascii=False, default=str)
@@ -150,7 +157,8 @@ def compact_tool_results_in_session_history(
             (sid, max(1, min(int(limit_messages or 5000), 200_000))),
         )
         rows = cur.fetchall() or []
-        for mid, raw in rows:
+        for row in rows:
+            mid, raw = _chat_message_id_content(row)
             scanned += 1
             txt = str(raw or "")
             max_seen = max(max_seen, len(txt))
diff --git a/runtime/tools/public/memory_wiki_tools.py b/runtime/tools/public/memory_wiki_tools.py
index 84767b08..1a90a2c9 100644
--- a/runtime/tools/public/memory_wiki_tools.py
+++ b/runtime/tools/public/memory_wiki_tools.py
@@ -99,10 +99,27 @@ def _search_tool(public_name: str, desc: str) -> ToolSpec:
         parameters={
             "type": "object",
             "properties": {
-                "query": {"type": "string"},
-                "limit": {"type": "integer"},
+                "query": {"type": "string", "description": "Search query string."},
+                "limit": {"type": "integer", "description": "Max hits per page (server caps to wiki max)."},
+                "offset": {"type": "integer", "description": "Hit offset for pagination (0-based)."},
+                "context_lines": {
+                    "type": "integer",
+                    "description": "Lines of context around each match (server caps at 5).",
+                },
                 "is_regex": {"type": "boolean"},
                 "case_sensitive": {"type": "boolean"},
+                "path_prefix": {
+                    "type": "string",
+                    "description": "Only search under this relative path prefix (e.g. users/).",
+                },
+                "expand_query": {
+                    "type": "boolean",
+                    "description": "If true, try synonym-expanded variants (ignored when is_regex is true).",
+                },
+                "max_rounds": {
+                    "type": "integer",
+                    "description": "Max expansion rounds when expand_query is true (1–5).",
+                },
             },
             "required": ["query"],
             "additionalProperties": False,
diff --git a/tests/test_history_tool_result_compact.py b/tests/test_history_tool_result_compact.py
index 864be346..dc1eb59a 100644
--- a/tests/test_history_tool_result_compact.py
+++ b/tests/test_history_tool_result_compact.py
@@ -3,7 +3,18 @@ from __future__ import annotations
 import json
 
 from svc.persistence.sqlite_store import SqliteStore
-from runtime.chat.history_tool_result_compact import compact_tool_results_in_session_history
+from runtime.chat.history_tool_result_compact import (
+    _chat_message_id_content,
+    compact_tool_results_in_session_history,
+)
+
+
+def test_chat_message_id_content_dict_row() -> None:
+    assert _chat_message_id_content({"id": 42, "content": "hello"}) == (42, "hello")
+
+
+def test_chat_message_id_content_tuple_like() -> None:
+    assert _chat_message_id_content((9, "z")) == (9, "z")
 
 
 def test_compact_tool_results_in_session_history_rewrites_large_tool_message(tmp_path) -> None:  # noqa: ANN001
diff --git a/tests/test_memory_wiki_tools_loader.py b/tests/test_memory_wiki_tools_loader.py
index d0d11ed3..bb9a4bcd 100644
--- a/tests/test_memory_wiki_tools_loader.py
+++ b/tests/test_memory_wiki_tools_loader.py
@@ -12,6 +12,22 @@ from runtime.tools.public.memory_wiki_tools import (
 )
 
 
+def test_memory_wiki_search_tool_schema_exposes_wiki_search_args() -> None:
+    props = memory_wiki_search_tool().parameters.get("properties") or {}
+    for key in (
+        "query",
+        "limit",
+        "offset",
+        "context_lines",
+        "is_regex",
+        "case_sensitive",
+        "path_prefix",
+        "expand_query",
+        "max_rounds",
+    ):
+        assert key in props, f"missing schema property: {key}"
+
+
 def test_memory_wiki_tools_handlers_load_without_dataclass_module_error() -> None:
     status = memory_wiki_status_tool().handler({})
     assert isinstance(status, dict)