When a tool on a server built with the standalone FastMCP package returned a list, the model got the list twice, once as plain text and once as structured data, so every list result cost two to three times the tokens. That package sends the whole list as a single piece of text, a format Open WebUI did not recognise as a duplicate. The list now reaches the model once, and structured data that the text does not already contain is still passed along.
Fixes#32719
A tool call to an MCP server had no time limit, so a server that hung kept the chat waiting until a reverse proxy or the server itself closed the connection, even with AIOHTTP_CLIENT_TIMEOUT_TOOL_SERVER set. The call now stops after the configured number of seconds and the model sees the timeout as a tool error, which is how OpenAPI tool servers already behave. When the variable is unset it falls back to AIOHTTP_CLIENT_TIMEOUT, and with neither set (or a value of 0 or below) MCP tool calls still have no time limit.
Fixes#31640
