Garry Tan and Claude Fable 5.1
3b7a2775ee
feat(design-detect): consent-gated engine install, checksum-pinned and receipted
...
`gstack-design-detect.ts install` is the one download gstack makes, and only
after a design skill's one-time question got a yes. It fetches the engine
version gstack has tested (0.1.3) for this platform from impeccable's own
GitHub release, verifies it against the checksum pinned in
lib/design-detect-contract.ts (all five platforms, captured from the
release's .sha256 sidecars; linux-x64 equals the fixture engine), writes an
egress receipt before the fetch and refuses to download when the receipt
cannot be written (fail-closed; the sink is registered in the wiring test's
polarity table), caps the download at 32 MB, streams with the cap enforced,
writes the file only after the hash matches, and places it under
~/.impeccable/bin/<version>/ (a trusted IMPECCABLE_HOME is honored; never
inside a project). No skill, no hook, no launcher, no npx. --sha256 accepts a
sidecar checksum for a version gstack has not pinned; --base allows a mirror
(https, or http on loopback for tests). After a successful install the probe
runs and its lines follow, so the skill sees READY at once.
The probe ends with DESIGN_DETECTOR_INSTALL_OFFER (version, platform, bytes,
destination) whenever it found no engine and the user has not answered the
question; once design_detector_install_prompted is true it prints neither the
offer nor the NOT_CACHED hint, which used to repeat on every run. The hint's
npx wording is corrected: `npx impeccable detect --help` caches the engine
for npx only, not where the probe looks.
gstack-config gains design_detector_install_prompted (true|false, typo
rejected, enumerated in list and defaults). Tests: a loopback mirror (async
spawn, so the in-process server can answer) covers install, re-install as a
verified no-op, checksum mismatch, 404, unpinned version, non-https base,
design_detector off, and IMPECCABLE_HOME inside the repo; the offer and the
silenced hint; pin completeness per platform.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com >
2026-09-09 04:51:14 +00:00
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