LLM 0.32a3 adds tool-call pause/resume, and Fable 5 wrote almost all of it.

Simon Willison shipped a PauseChain exception to cleanly pause a tool chain for human approval, guaranteed unique tool_call_ids (synthesizing ULIDs when providers omit them), and resume-from-history support. He says Fable produced the API design, tests, and docs across both LLM and Datasette Agent in what felt like days of work compressed into one. These are exactly the primitives you want for human-approval gates in agentic tool execution.