Third-Party Notices

gstack is MIT. The files below contain material derived from Apache-2.0 and MIT works, rewritten in gstack's voice and modified. Rewriting is not an exemption: the license texts are in licenses/, and each file derived from an Apache-2.0 work 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 from crates/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, from SKILL.md, reference/craft-floor.md, and reference/new-work.md, rewritten.
• design-consultation/sections/proposal-and-preview.md.tmpl: the font-selection procedure and the calibration paragraph, rewritten; and the SKILL.md / sections/*.md files generated from these sources.

Unmodified copy:

• test/fixtures/impeccable-antipatterns.json: crates/live/assets/antipatterns.json at commit 87d8f6d6 (engine-v0.1.3), wrapped in a _source provenance 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.

ai-design-skills and redesign-skill — Copyright (c) 2026 Elaya — MIT License

https://github.com/elayadesign/ai-design-skills (skills/landing-page-design, skills/design-to-motion, at 38bbe576) and https://github.com/elayadesign/redesign-skill (skills/redesign-existing-projects, at 64627f6e). License text: licenses/MIT-elaya.txt.

Derived, modified (rules rewritten in gstack's voice and reconciled with its design rules; Elaya's fixed fonts, colors, spacing values, icon sets and signature components are not carried over):

• design-html/sections/craft.md.tmpl: the Persuade intake, page archetypes, page structure, conversion and copy rules, indexing and build order from landing-page-design Part A; the content-realism, ship-floor, scale-snapping, line-break and motion rules from landing-page-design Part B, the website context of design-to-motion and the redesign-skill audit; and the generated design-html/SKILL.md / sections/craft.md.
• lib/design-lint/rules/copy.ts: the content-realism and ship-floor tells, the design lint's copy tier.
• design-shotgun/SKILL.md.tmpl: page archetypes as a variant axis.
• design-review/sections/craft-audit.md.tmpl (and the generated sections/craft-audit.md): the redesign-skill audit of an existing site, its fix-priority order and Tailwind version check; scripts/resolvers/design-craft.ts: the Persuade conversion checks, also rendered into plan-design-review/sections/review-sections.md; and the craft-tell entries in lib/design-catalog.ts.
• design-motion/SKILL.md.tmpl and design-motion/sections/fidelity.md.tmpl, motion.md.tmpl and figma.md.tmpl (and the generated design-motion/SKILL.md and sections/*.md): design-to-motion's fidelity rules, Figma layer-export table (now an optional source path), loading choreography, story loops, loop cycle, easing, checks and export formats, reconciled with gstack's one authored motion moment, content visible without script, and the slop catalog's motion tells.
• lib/motion-capture.ts and bin/gstack-motion-capture.ts: design-to-motion's deterministic capture (fake clock, whole-millisecond steps averaging 1000/60, the __start/__tick/__lt page contract, PRE frames).
• lib/motion-encode.ts and bin/gstack-motion-encode: design-to-motion's ffmpeg recipes for the MP4, loop GIF and 800x500 GIF, and its seam, empty-beat, rest and overflow checks as ffmpeg PSNR comparisons.

hallmark — Copyright (c) 2026 Hallmark contributors — MIT License

https://github.com/Nutlope/hallmark (skills/hallmark/scripts/sloplint.mjs, sloplint-render.mjs, references/gates.md, scripts/fixtures/, at 7ec8682). License text: licenses/MIT-hallmark.txt.

Derived, modified (every gate rewritten in TypeScript and in gstack's voice, mapped onto gstack's severity words; hallmark's theme stamp, genres, posture guards, photo index and judged gates are not carried over):

• lib/design-lint/ and bin/gstack-design-lint: the static tier's parsers (CSS rules and tokens, HTML and component pseudo-HTML, Tailwind class strings), the colour maths, the waiver record, and the rule families under lib/design-lint/rules/; the render tier in lib/design-lint/render*.ts, driving gstack's own browser instead of puppeteer.
• test/fixtures/design-lint/{slopped.html,eyebrow-pass,eyebrow-fail,tailwind-pass,tailwind-fail,waiver}: the fixtures, with their waiver comments rewritten to the lint's form.

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.

skill-diet — Copyright Nico Bailon — MIT License

https://github.com/nicobailon/skill-diet (at 5f41df1; license text: licenses/MIT-skill-diet.txt). Adapted, not vendored: the levels table, the five-step edit ladder and the size-budget rule in write-skill/SKILL.md.tmpl, and the full-diet procedure in write-skill/references/diet.md, rewritten for gstack's templates, carved sections, bins and ratchet tests. The before/after/none scoring rules in docs/designs/SKILL_EVAL_CONTRACT.md follow skill-diet's scripts/eval.mjs.

tstack — Copyright Theo Browne — MIT License

https://github.com/t3dotgg/tstack (skills/sol-loop, at 7de017b3). Ideas, not text: the three-word severity glossary (blocker, should, nit) and the two stop rules (a review that grew the diff cuts first; the end of the budget is not approval) in ship/sections/review-army.md.tmpl, review/checklist.md and docs/review-policy.md are written in gstack's words and mapped onto gstack's blocking floor. No sentence is copied, so no license text is carried; this entry is a courtesy. Also ideas, not text (skills/modernize, skills/leaving-pr-comments, skills/full-send, agents/openai.yaml, at 7de017b3): the MODERNIZE / REWORK / CLOSE verdict names in modernize/SKILL.md.tmpl, the > [!NOTE] author callout behind gstack-post --attribute, the three-bullet unattended grant in docs/unattended.md, and a per-skill Codex default_prompt; all written fresh in gstack's words.

Design port (skills/babysit-pr/scripts/pr-wait, at 7de017b3; license text: licenses/MIT-tstack.txt): bin/gstack-pr-wait, lib/pr-wait.ts and lib/pr-wait-github.ts follow pr-wait's design (one stdout line per real event, --until green|ready|any-change, exit 0/1/2, required checks from rulesets and classic protection, two identical polls before green, the base-moved-and-touches- this-PR event, BEHIND and DIRTY, a per-PR lock, a 6-hour baseline), rewritten in TypeScript on gstack's bun shebang, state root, result codes and config keys; no Python line is carried. Each file names the source in its header.

pstack — Copyright Lauren Tan — MIT License

https://github.com/cursor/plugins (pstack/skills/interrogate, lead-judgment.md). Ideas, not text: the lead-judgment filters applied before a merged review finding counts (nit gravity, hypothetical versus actual, structure for a case that does not exist, a different design is not a defect, missing context; independent agreement as the strongest signal; NO FINDINGS as a correct result) in scripts/resolvers/review-army.ts stage 4 and docs/review-policy.md are written in gstack's words. No sentence is copied, so no license text is carried; this entry is a courtesy. Also ideas, not text, from pstack/skills/blast-radius, recall, benchmark-checklist, architect (references/design-red-flags.md) and principle-attack-the-premise (Garry, 2026-10-26: "Do it, send"): the one safety fact, the five-rung evidence ladder and the shared-premise red flag in investigate/sections/blast-radius.md.tmpl and investigate/SKILL.md.tmpl; the transcript-mining fallback and its status-tagged brief in context-restore/sections/transcripts.md.tmpl; the seven questions in benchmark/sections/vet-the-number.md.tmpl; the second-shape comparison and the eight design red flags in Section 1 of plan-eng-review/sections/review-sections.md.tmpl; and the generated SKILL.md / sections/*.md files. Each section names its source in a first-line comment. Written in gstack's words; no sentence is copied, so no license text is carried.

Also ideas, not text, from pstack/skills/principle-*, poteto-mode and its eval playbook: ETHOS.md principles 5 to 8, the observable-questions rule in plan-tune/SKILL.md.tmpl and docs/proactive.md, the blinding rules in eval-plan/SKILL.md.tmpl and docs/TESTING_INTERNALS.md, and the limiter sentence in AGENTS.md step 4 (GSTA-124).

pstack, ported scripts — Copyright (c) 2026 Lauren Tan — MIT License

https://github.com/cursor/plugins (pstack/ at 99b609a7). License text: licenses/MIT-pstack.txt. Unlike the ideas entry above, these two are code ports, so the license text is carried and each file's header names its source.

Derived, modified:

• bin/gstack-decision-trail: pstack/skills/show-me-your-work/scripts/log.sh in TypeScript: the header-once append, the one-line cells and the spreadsheet formula guard (a leading quote on cells starting with =, +, - or @). The start subcommand and the --run admission check are gstack's.
• bin/gstack-worktree-audit: pstack/skills/poteto-mode/scripts/worktree-audit.sh, with the PR column read through gh --jq alone, the chat column read from Claude Code's per-worktree transcript directory, and a --no-fetch flag.

pstack (unslop) — Copyright Lauren Tan — MIT License

https://github.com/cursor/plugins (pstack/skills/unslop/SKILL.md, at 99b609a7). The word lists in lib/prose-lint.ts (the autopilot vocabulary and the metaphor nouns with their plain replacements) are facts taken from unslop's rules 7 and 26; the rules a regular expression decides (the "not just X, but Y" shape, the mid-sentence colon, the bold label that restates its line, arrows and dropped articles) are written in gstack's words, scoped to the CHANGELOG entry and PR body /ship writes, and report-only elsewhere. No sentence is copied, so no license text is carried; this entry is a courtesy.