Every tool the GitHub MCP server offered was sitting right there in the list — all 26 were recognized correctly. Call any one of them and it failed in under 1 second, every time, with one line on screen: Tool execution failed . No reason attached. Even reading a fully public repository — something that needs no permission at all — failed the exact same way. TL;DR: my AI assistant's first guess — "maybe the token's gone bad" — was right the whole time. I ran an experiment that looked like it...