0.5.1 — 2026-08-17

Release Notes

Stop lands mid-stream. Cancellation of a brokered turn was cooperative only
between model rounds, so a Stop aimed at a long single-response turn waited for
the entire response to stream — indistinguishable, from an embedding UI, from
the Stop doing nothing.

Fixed

• The native transport releases a cancelled turn's provider stream instead
  of draining it. The transport polls the durable cancellation surface between
  streamed SSE lines (its own throttled store connection, latching on first
  observation) and releases the stream at a complete-line boundary; what fully
  arrived assembles exactly as a naturally ended body.
• A released round settles cancelled, keeping the text that arrived as
  that round's durable assistant message, and starts no offered tool — a
  truncated text tail parses exactly like a final answer, and settling it
  completed would launder a stop into a normal terminal. An unreleased
  natural terminal still wins over a racing request, and transports without a
  release surface keep the between-rounds observation unchanged
  (spec/agent-harness.md "Cancellation").

Added

• BrokeredTurnMachine::with_stream_released and the
  BrokeredTurnContext::stream_released probe, for hosts whose transports can
  release an in-flight stream. None preserves prior behavior exactly.

Install whipplescript 0.5.1

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/GaugeWright/whipplescript/releases/download/v0.5.1/whipplescript-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/GaugeWright/whipplescript/releases/download/v0.5.1/whipplescript-installer.ps1 | iex"

Install prebuilt binaries via Homebrew

brew install GaugeWright/tap/whipplescript

Download whipplescript 0.5.1

File	Platform	Checksum
whipplescript-aarch64-apple-darwin.tar.xz	Apple Silicon macOS	checksum
whipplescript-x86_64-apple-darwin.tar.xz	Intel macOS	checksum
whipplescript-x86_64-pc-windows-msvc.zip	x64 Windows	checksum
whipplescript-aarch64-unknown-linux-gnu.tar.xz	ARM64 Linux	checksum
whipplescript-x86_64-unknown-linux-gnu.tar.xz	x64 Linux	checksum