fix(agent): parse raw json web search calls (#4088)

tests/test_web_search_raw_json_tool_call.py

@@ -0,0 +1,71 @@
+"""Local text models can leak web_search calls as prose plus bare JSON.
+
+gpt-oss-20b sometimes writes:
+
+    Need to do web_search for ...
+    {"query":"...", "time_filter":"week"}
+
+That is an intended tool call in non-native/textual tool mode, but older parsing
+only recognized fenced blocks, [TOOL_CALL], XML invoke, and tool_code markup.
+"""
+import json
+import sys
+from unittest.mock import MagicMock
+
+for mod in ['src.agent_tools', 'src.tool_parsing', 'src.tool_schemas', 'src.tool_execution']:
+    sys.modules.pop(mod, None)
+for mod in [
+    'sqlalchemy', 'sqlalchemy.orm', 'sqlalchemy.ext', 'sqlalchemy.ext.declarative',
+    'sqlalchemy.ext.hybrid', 'sqlalchemy.sql', 'sqlalchemy.sql.expression',
+    'src.database', 'core.models', 'core.database', 'core.auth'
+]:
+    if mod not in sys.modules:
+        sys.modules[mod] = MagicMock()
+
+import src.agent_tools  # noqa: E402, F401
+from src.tool_parsing import parse_tool_blocks, strip_tool_blocks  # noqa: E402
+
+
+def test_raw_json_after_web_search_phrase_runs_as_web_search():
+    text = (
+        "Need to do web_search for best chocolate chip cookies. Use web_search function.\n\n"
+        '{"query":"best chocolate chip cookie recipe","time_filter":"week"}'
+    )
+
+    blocks = parse_tool_blocks(text)
+
+    assert len(blocks) == 1
+    assert blocks[0].tool_type == "web_search"
+    payload = json.loads(blocks[0].content)
+    assert payload == {
+        "query": "best chocolate chip cookie recipe",
+        "time_filter": "week",
+    }
+
+
+def test_raw_json_without_web_tool_name_is_ignored():
+    text = 'Here is a saved search config:\n\n{"query":"private customer name"}'
+
+    assert parse_tool_blocks(text) == []
+
+
+def test_raw_json_fallback_is_disabled_for_native_parser_gate():
+    text = (
+        "Need to do web_search for best chocolate chip cookies.\n\n"
+        '{"query":"best chocolate chip cookie recipe"}'
+    )
+
+    assert parse_tool_blocks(text, skip_fenced=True) == []
+
+
+def test_strip_tool_blocks_removes_executed_raw_json():
+    text = (
+        "Need to do web_search for best chocolate chip cookies. Use web_search function.\n\n"
+        '{"query":"best chocolate chip cookie recipe","time_filter":"week"}'
+    )
+
+    cleaned = strip_tool_blocks(text)
+
+    assert '{"query"' not in cleaned
+    assert "best chocolate chip cookie recipe" not in cleaned
+    assert "Need to do web_search" in cleaned