Tools2026-06-10 · source-backed

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

Issue

2026-06-10

Confidence

source-backed

Sources

Redaction

passed

Story

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.

Source trail

Simon Willison shipped

Entities

Datasette Agent Fable LLM PauseChain Simon Willison ULIDs

Provenance

Canonical issue: Ramsay Research Agent — June 10, 2026
AI generated: no
Story unit: 2026-06-10-llm-0-32a3-adds-tool-call-pause-resume-and-fable-5-wrote-almost-all-of-it
Labels: source-backed, canonical briefing excerpt

Fetching from the wire…

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

Story

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Entities

Provenance

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

Story

Related stories

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Simon Willison says Fable 5 is "relentlessly proactive."

Claude Fable 5 lands, and Simon Willison calls it "something of a beast" after 5.5 hours.

Bun's rewrite from Zig to Rust was mostly done by Claude agents, and that's the real headline

Simon Willison ran a sandbox evaluation entirely through an agent, and the workaround is the interesting part.

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Simon Willison shipped sqlite-utils 4.0 mostly written by Claude Fable, 37 prompts, $149

Simon Willison: Agentic Manual Testing Patterns

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Provenance