diff --git a/README.md b/README.md
index f2c227586b..2eaf59ab3c 100644
--- a/README.md
+++ b/README.md
@@ -254,7 +254,7 @@ fences, including unclosed fences, in complete and streamed replies.
 
    Brave web search preserves valid entries in mixed result lists. Malformed response containers or lists containing no usable entries return a structured format error; missing, null, or empty results keep the existing "No results found" response. Format errors also log the malformed container's path and type, or the absence of usable result objects, without including search queries, credentials, or payload values.
 
-   You.com, GroundRoute and Webz initialize HTTPX clients in a worker thread so synchronous TLS trust loading does not block the agent event loop; requests and session cleanup remain asynchronous.
+   Several providers, including You.com, GroundRoute, Webz and InfoQuest, initialize HTTPX clients in a worker thread so synchronous TLS trust loading does not block the agent event loop; requests and session cleanup remain asynchronous.
 
    GroundRoute web search and fetch contain malformed HTTP-success payloads the same way: a non-object payload, a `results` container that is not a list, or a non-empty list with no object entries returns the provider's format error, while non-object entries in an otherwise valid list are skipped in order. Missing, null, or empty results keep the existing "No results found" response.
 
diff --git a/backend/AGENTS.md b/backend/AGENTS.md
index 236f67134a..8a655f174b 100644
--- a/backend/AGENTS.md
+++ b/backend/AGENTS.md
@@ -136,13 +136,13 @@ Read the nearest scoped `AGENTS.md` for subsystem ownership.
 
 Read-only knowledge: [contract](docs/KNOWLEDGE.md) covers independent retrieval
 tools, scope intersection and extension-owned providers.
-HTTPX clients for RAGFlow, LightRAG, You.com, GroundRoute, Webz, Crawl4AI and
-Browserless use `asyncio.to_thread` for synchronous TLS setup; requests and
-cleanup stay on-loop, and the construction is owned as a task so cancelling
-during setup still closes the client it builds.
-The list is non-exhaustive: jsonify, SearXNG, Jina and InfoQuest
-still construct their clients on the loop and should follow the same rule when
-touched.
+HTTPX clients for several community providers, including RAGFlow, LightRAG,
+You.com, GroundRoute, Webz, Crawl4AI, Browserless and InfoQuest, use
+`asyncio.to_thread` for synchronous TLS setup; requests and cleanup stay on-loop,
+and the construction is owned as a task so cancelling during setup still closes
+the client it builds.
+The list is non-exhaustive: jsonify, SearXNG and Jina still construct their
+clients on the loop and should follow the same rule when touched.
 
 ### Harness / App Split
 
diff --git a/backend/packages/harness/deerflow/community/infoquest/infoquest_client.py b/backend/packages/harness/deerflow/community/infoquest/infoquest_client.py
index 356ac43c4e..d7f68e3450 100644
--- a/backend/packages/harness/deerflow/community/infoquest/infoquest_client.py
+++ b/backend/packages/harness/deerflow/community/infoquest/infoquest_client.py
@@ -4,6 +4,7 @@ In order to set this up, follow instructions at:
 https://docs.byteplus.com/en/docs/InfoQuest/What_is_Info_Quest
 """
 
+import asyncio
 import json
 import logging
 import os
@@ -79,7 +80,7 @@ class InfoQuestClient:
 
         logger.debug("Sending crawl request to InfoQuest API")
         try:
-            async with httpx.AsyncClient(follow_redirects=True) as client:
+            async with await asyncio.to_thread(httpx.AsyncClient, follow_redirects=True) as client:
                 response = await client.post("https://reader.infoquest.bytepluses.com", headers=headers, json=data, timeout=_REQUEST_TIMEOUT_SECONDS)
 
             # Check if status code is not 200
@@ -196,7 +197,7 @@ class InfoQuestClient:
         if site != "":
             params["site"] = site
 
-        async with httpx.AsyncClient(follow_redirects=True) as client:
+        async with await asyncio.to_thread(httpx.AsyncClient, follow_redirects=True) as client:
             response = await client.post("https://search.infoquest.bytepluses.com", headers=headers, json=params, timeout=_REQUEST_TIMEOUT_SECONDS)
         response.raise_for_status()
 
@@ -440,7 +441,7 @@ class InfoQuestClient:
         elif self.image_size:
             logger.warning(f"image_size {self.image_size} is not valid, must be 'l', 'm', or 'i'")
 
-        async with httpx.AsyncClient(follow_redirects=True) as client:
+        async with await asyncio.to_thread(httpx.AsyncClient, follow_redirects=True) as client:
             response = await client.post("https://search.infoquest.bytepluses.com", headers=headers, json=params, timeout=_REQUEST_TIMEOUT_SECONDS)
         response.raise_for_status()
 
diff --git a/backend/tests/blocking_io/test_search_client_ssl.py b/backend/tests/blocking_io/test_search_client_ssl.py
index 7e5e763ee0..e603047b31 100644
--- a/backend/tests/blocking_io/test_search_client_ssl.py
+++ b/backend/tests/blocking_io/test_search_client_ssl.py
@@ -9,6 +9,7 @@ import httpx
 import pytest
 
 from deerflow.community.groundroute import tools as groundroute
+from deerflow.community.infoquest.infoquest_client import InfoQuestClient
 from deerflow.community.webz import tools as webz
 from deerflow.community.youcom import tools as youcom
 
@@ -69,3 +70,43 @@ async def test_search_tool_tls_setup_runs_off_loop(provider, monkeypatch):
     assert contexts
     assert len(clients) == 1
     assert clients[0].is_closed
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("operation", ["fetch", "web_search_raw_results", "image_search_raw_results"])
+async def test_infoquest_client_tls_setup_runs_off_loop(operation, monkeypatch):
+    loop_thread = threading.get_ident()
+    original_context = ssl.create_default_context
+    contexts = []
+    clients = []
+
+    def create_context(*args, **kwargs):
+        assert threading.get_ident() != loop_thread, "TLS trust loading blocks the event loop"
+        context = original_context(*args, **kwargs)
+        contexts.append(context)
+        return context
+
+    async def send(self, request, **kwargs):
+        assert threading.get_ident() == loop_thread
+        clients.append(self)
+        if operation == "fetch":
+            assert request.url.host == "reader.infoquest.bytepluses.com"
+            return httpx.Response(200, request=request, json={"reader_result": "<html>Synthetic</html>"})
+        assert request.url.host == "search.infoquest.bytepluses.com"
+        assert json.loads(request.content)["query"] == "synthetic query"
+        return httpx.Response(200, request=request, json={"search_result": {"results": []}})
+
+    monkeypatch.setattr(ssl, "create_default_context", create_context)
+    monkeypatch.setattr(httpx.AsyncClient, "send", send)
+
+    client = InfoQuestClient()
+    if operation == "fetch":
+        result = await client.fetch("https://example.com")
+        assert "Synthetic" in result
+    else:
+        result = await getattr(client, operation)("synthetic query", "")
+        assert result == {"search_result": {"results": []}}
+
+    assert contexts
+    assert len(clients) == 1
+    assert clients[0].is_closed