From 109aa6f38630aeb33b3b185dac8b903fb3ee9bf4 Mon Sep 17 00:00:00 2001
From: Shawn <12529572.canada.inc@gmail.com>
Date: Sun, 2 Aug 2026 09:14:29 -0400
Subject: [PATCH] fix: default loose function tools to strict:false in
 Responses API conversion

Loose Chat Completions / MCP / OpenAPI-derived function tools carry no
tool-level strict flag, so convert_to_responses_payload() sent them to
/v1/responses with strict omitted. The Responses API then materializes
every optional property and can populate mutually-exclusive filters,
which get forwarded to the tool unchanged and can be rejected. Default
the converted tool to strict:false, preserving an explicit strict from
the source tool.

Closes #27750
---
 backend/open_webui/routers/openai.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/backend/open_webui/routers/openai.py b/backend/open_webui/routers/openai.py
index e5c9f2e7e8..690018e80b 100644
--- a/backend/open_webui/routers/openai.py
+++ b/backend/open_webui/routers/openai.py
@@ -1141,8 +1141,8 @@ def convert_to_responses_payload(payload: dict) -> dict:
                         converted_tool['description'] = func['description']
                     if 'parameters' in func:
                         converted_tool['parameters'] = func['parameters']
-                    if 'strict' in func:
-                        converted_tool['strict'] = func['strict']
+                    # Default loose tools to non-strict; preserve explicit strict.
+                    converted_tool['strict'] = func.get('strict', False)
                 converted_tools.append(converted_tool)
             else:
                 # Already in correct format or unknown format, pass through