When the probe prints DESIGN_DETECTOR_INSTALL_OFFER the design skills ask the user one AskUserQuestion, in interactive sessions only (spawned or headless runs never install and never ask; Conductor gets the prose brief), before any other step: install the engine now, not now, never ask again (design_detector_install_prompted), or turn the detector off. A yes runs the receipted, checksum-pinned install and the skill continues with a READY probe. The brief says what impeccable is, what the one file is, where it goes, how it is verified and logged, and that no skill or hook comes with it; users who want the /impeccable skill run npx impeccable install themselves. design-review carries the brief inline (it is not carved). design-html keeps its skeleton small: the probe block points at a new read-on-demand section, sections/detector-install-offer.md, registered in its manifest and carve guard; its skeleton ceiling is re-measured (55,262) and its eager ceiling set to the measured 13,767. The review and ship passes state that they never offer an install. NOTICE.md, README, docs/skills.md, the interop design doc, and the CHANGELOG describe the new posture: gstack still never runs impeccable's installer or launcher; the one download is consented, pinned, and receipted. Ship goldens refreshed for the review-pass wording. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Third-Party Notices
gstack is MIT. The files below contain material derived from Apache-2.0 works,
rewritten in gstack's voice and modified. Rewriting is not an exemption: the
license text is in licenses/Apache-2.0.txt, and each derived file carries a
notice that it was changed. Unmodified copies (the rule-registry fixture, the
license text) carry no header and are listed here instead.
impeccable — Copyright Paul Bakaus — Apache License 2.0
https://github.com/pbakaus/impeccable
Derived, modified:
lib/design-catalog.ts: rule ids and names fromcrates/live/assets/antipatterns.json; the prose is gstack's.scripts/resolvers/design.ts: the Persuade / Operate / Read / Experience visitor modes, the craft-floor reflexes (browser surfaces, one authored motion moment, depth has an offset, tinted secondary text, space above headings, light-or-dark from the use scene), and the three-looks calibration, fromSKILL.md,reference/craft-floor.md, andreference/new-work.md, rewritten.design-consultation/sections/proposal-and-preview.md.tmpl: the font-selection procedure and the calibration paragraph, rewritten; and theSKILL.md/sections/*.mdfiles generated from these sources.
Unmodified copy:
test/fixtures/impeccable-antipatterns.json:crates/live/assets/antipatterns.jsonat commit 87d8f6d6 (engine-v0.1.3), wrapped in a_sourceprovenance object.
Not distributed: bin/gstack-design-detect.ts invokes an impeccable engine the
user installed. gstack does not ship or mirror that engine and never runs impeccable's
installer or launcher. The one download gstack can make is the engine binary
itself, only after the user accepts a design skill's one-time offer: fetched from
impeccable's own GitHub release into ~/.impeccable/bin/<version>/, verified
against the checksum pinned in lib/design-detect-contract.ts, and recorded in
the egress ledger first. gstack does not audit the engine's network behavior; the
wrapper refuses URL targets so gstack never asks it to touch the network.
DESIGN.md specification — Copyright Google LLC — Apache License 2.0
https://github.com/google-labs-code/design.md
lib/design-md.ts, bin/gstack-design-md.ts, and the Phase 6 template in
design-consultation/sections/proposal-and-preview.md.tmpl implement the
format (YAML token front matter in five groups, eight canonical sections in
spec order, {path} token references). No specification text is reproduced.