
@yukihayama(Yuki Hayama)Dates come flying into the MCP server as “today” — a complete FastMCP implementation that rejects AI arguments with four guardsMCPPythonpydanticAIClaude0Posted at 2026-11-11The overnight task-organization agent suddenly stopped returning even one search result one morning. Identifying the cause took me three days—a failure on my part. The logs showed that what had been passed to the MCP tool was due_from: "today". The AI did not rea











