chore: minor code review fixes

Author: kamil-keycard

packages/mcp/src/keycardai/mcp/client/auth/coordinators/endpoint_managers.py

@@ -181,7 +181,7 @@ async def shutdown(self) -> None:
     def _find_free_port(self) -> int:
         """Find an available port on localhost."""
         with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
-            s.bind(('', 0))
+            s.bind((self._host, 0))
             s.listen(1)
             return s.getsockname()[1]
 
@@ -255,7 +255,7 @@ async def _handle_completion_request(self, request: web.Request) -> web.Response
                 self._pending_flows.pop(state, None)
 
             return web.Response(
-                text=f"❌ Error: {str(e)}",
+                text=f"❌ Authentication callback failed. Please try again.",
                 status=400
             )
 

packages/mcp/src/keycardai/mcp/client/auth/oauth/discovery.py

@@ -135,7 +135,7 @@ async def discover_auth_server(
 
                     if "registration_endpoint" not in data:
                         # Don't expose full metadata - may contain internal configuration
-                        raise ValueError(f"No registration endpoint in authorization server metadata")
+                        raise ValueError("No registration endpoint in authorization server metadata")
 
                     await self.storage.save_auth_server_metadata(data)
                     logger.info(f"Discovered and cached authorization server: {auth_server_url}")

packages/mcp/src/keycardai/mcp/client/integrations/__init__.py

@@ -19,15 +19,15 @@
 
 # Try to import LangChain integration
 try:
-    from . import langchain_agents
+    from . import langchain_agents  # noqa: F401
     __all__.extend(["langchain_agents"])
 except ImportError:
     pass
 
 # Try to import OpenAI Agents integration
 try:
-    from . import openai_agents
-    from .openai_agents import OpenAIMCPServer
+    from . import openai_agents  # noqa: F401
+    from .openai_agents import OpenAIMCPServer  # noqa: F401
     __all__.extend(["openai_agents", "OpenAIMCPServer"])
 except ImportError:
     pass

packages/mcp/src/keycardai/mcp/client/integrations/langchain_agents.py

@@ -87,7 +87,7 @@ async def __aenter__(self) -> "LangChainClient":
         try:
             tool_infos = await self._mcp_client.list_tools()
             # Group tools by server to determine which servers are authenticated
-            servers_with_tools = set(info.server for info in tool_infos)
+            servers_with_tools = {info.server for info in tool_infos}
             self._authenticated_servers = list(servers_with_tools)
         except (AttributeError, Exception) as e:
             # Session not fully connected (likely pending auth)

packages/mcp/src/keycardai/mcp/client/integrations/openai_agents.py

@@ -298,7 +298,7 @@ async def __aenter__(self) -> "OpenAIAgentsClient":
         try:
             tool_infos = await self._mcp_client.list_tools()
             # Group tools by server to determine which servers are authenticated
-            servers_with_tools = set(info.server for info in tool_infos)
+            servers_with_tools = {info.server for info in tool_infos}
             self._authenticated_servers = list(servers_with_tools)
         except (AttributeError, Exception) as e:
             # Session not fully connected (likely pending auth)