GStack 2 host compatibility

This matrix uses evidence tiers. It does not call a host “supported” merely because its directory name exists in legacy setup code.

Tiers

Tier	Meaning
Portable	The canonical `skills/<name>/SKILL.md` tree follows the Agent Skills specification and uses no required host-private placement logic. This is a source-format claim.
Verified	The named layer and matrix cells passed against a recorded host/installer version. A scoped “Verified — installer” claim does not imply the host UI launched or executed judgment.
Native	A necessary host API adds behavior unavailable through portable skills while consuming the same canonical judgment source. Native is not “better”; it carries an additional adapter maintenance contract.

Tiers are cumulative only when evidence says so. A portable host is not automatically verified. A legacy generated host output is not a native GStack 2 bundle.

Canonical installation

npx skills add time-attack/gstack

The standards installer owns host detection, destination paths, project/global scope, copy versus symlink, updates, removal, and selected-skill installation. Review its detected-host prompt; detection must never silently enroll a host.

Examples supported by the installer interface:

# One public skill only
npx skills add time-attack/gstack --skill plan

# Installer-managed global scope
npx skills add time-attack/gstack -g

Run npx skills add --help for the installed CLI version before scripting agent-selection flags. GStack deliberately does not reproduce those flags or host paths in ./setup.

The expected discoverable names are exactly:

plan
design
qa
debug
review
ship

compat/*.md and references/legacy/*.md are not SKILL.md files and must not appear as additional skills. Installing a subset must not pull the other five public entries unless the user selected them.

Candidate installer matrix

The isolated standard-installer matrix passed 470/470 checks with skills CLI 1.5.19: 16 install cases and two removal cases. Default discovery projected only canonical skills/; separate explicit-selection cases covered a single canonical skill and an opt-in legacy alias. The matrix used symlinked and spaced source paths matching a clean checkout where ignored legacy host trees are absent. Every installed file was a physical copy and its hash matched the selected source. The standard skill installation remains Markdown-only and does not install the optional runtime. The committed evidence artifact is evals/installation/install-matrix.json.

Host	Portable	Project all-six	Global all-six	Selected-skill coverage	Installer tier	Host UI/process
Claude Code	yes	pass	pass	no separate subset case	Verified — installer	pending
OpenAI Codex	yes	pass	pass	global `qa`, `review`, `ship` pass + removal pass; opt-in alias covered	Verified — installer	v1/v2 failed; live v3 pending
Cursor	yes	pass	pass	project `qa`, `review`, `ship` pass + removal pass	Verified — installer	pending
Pi	yes	pass	pass	no separate subset case	Verified — installer	pending
OpenClaw	yes	pass	pass	project `ship` single-skill pass	Verified — installer	pending
GitHub Copilot	yes	pass	pass	no separate subset case	Verified — installer	pending

The representative selection cases installed exactly qa, review, and ship, independently at project scope for Cursor and global scope for Codex, then removed them noninteractively. Separate cases installed only ship for OpenClaw and explicitly selected the office-hours compatibility alias for Codex; neither alias nor unselected canonical skill was silently enrolled. --copy was advertised and used.

This is filesystem/installer verification, not a claim that six host UIs loaded or executed the skills. The Codex adversarial lane has no passing live result: v1 and immutable v2 failed, while v3 is green only in its offline 18-test / 111-assertion harness and has not run live. The installer matrix used the current local canonical projection through the published npx skills CLI, not the still-unpushed GitHub branch URL.

Legacy generators currently know ten host names. That is historical breadth, not proof that all ten install correctly. Kiro's old Codex-rewrite behavior and other host-output transforms are outside the canonical 2.0 path.

Verification procedure and evidence

Use a clean temporary home and project for every cell; never test against an operator's live skill directory.

Record OS, host version, Node/npm version, and skills CLI version.
List the source and assert exactly six default entries.
Install all six at project scope and verify each host discovers only those six GStack public skills.
Remove them through the standard installer.
Repeat at global scope.
Install a selected subset; verify unselected skills were not enrolled.
Reinstall/update without re-detecting or enrolling an unselected host.
Invoke a pure judgment mode with gstack absent from PATH.
Invoke a capability-dependent mode and verify one actionable runtime offer, without breaking judgment.
Exercise a path containing spaces and, where supported, symlink and read-only failure behavior.
Record exact command, exit status, output artifact, and cleanup result in TEST-EVIDENCE.md.

The automated filesystem portion is:

bun test test/gstack2-installation.test.ts
bun run scripts/gstack2/test-install-matrix.ts --full \
  --output /tmp/gstack2-install-matrix.json

The current matrix passed 470/470 installer CLI checks across 16 installs and two removals; its JSON artifact is committed at evals/installation/install-matrix.json. Steps 8–9, a passing live v3 adversarial run, and actual host UI loading remain separate behavioral gates.

Optional runtime/platform matrix

The optional runtime is separate from skill placement. From a repository checkout, the one host-neutral setup entrypoint is:

./setup
~/.gstack/bin/gstack doctor --json

./setup resolves a symlinked checkout, reinstalls the frozen production dependency set on every run, builds missing allowlisted capabilities through the runtime-only build target, validates and hashes every staged file, smoke-tests the CLI, atomically activates the version, and writes stable POSIX and Windows launchers under $GSTACK_HOME/bin (default ~/.gstack/bin). The bundle uses .exe targets on Windows and includes the CoreDevice/iOS bundle only on Darwin. Add the bin directory to PATH if the short gstack command is desired.

Twenty-four focused installer tests pass with 336 assertions. They cover manifests, paths with spaces, source-root symlinks, internal-link/path-escape rejection, failed build/ validation/smoke rollback including native-load rollback smoke, interrupted-pointer recovery, stable POSIX/Windows launchers, runtime-only builder selection, deterministic exact Sharp/ngrok platform closure, managed uninstall, and the host-neutral wrapper.

The deterministic clean macOS arm64 managed-bundle audit records 110 components, 1,829 files, 450,044,315 bytes, and 50 capability launchers. This is a platform-specific bundle measurement, not a universal byte count; platform-native package payloads differ. Setup installs frozen production-only dependencies and excludes the development-only Claude Agent SDK. The Sharp/ngrok closure is included. The Hugging Face sidecar is excluded and its package is development-only, so setup installs neither its inference runtime nor model weights and reports the L4 capability unavailable.

Platform	Source-level target	Candidate evidence
macOS	Node runtime + local browser + physical iOS where applicable	Runtime installer 24/336 and deterministic clean macOS arm64 bundle audit pass. The uninterrupted broad singleton run is green at 6,240 pass / 226 expected skips / 0 fail across 383 files. The signed-device gate remains pending.
Linux	Node runtime + local browser	Declared Dev Container GStack 2 suite passed at 136/0 with 1,127 assertions across 15 files; log: `/tmp/gstack2-devcontainer-gate-candidate-final4.log`. The one-assertion difference from the focused macOS result is the platform-conditional read-only-mode check. A clean Linux arm64 container used production-only install with the development SDK and model runtime absent, passed a local-browser journey and Sharp full-page screenshot, and uninstalled while preserving state. Native-host broad Linux remains pending.
Native Windows	Node runtime; curated free tests; browser fallback where retained	Blocked: native Windows CI pending. The local Windows-safe singleton lane is green at 2,815 pass / 57 expected skips / 0 fail across 213 files, but it is not native evidence.
Dev Container	Pure skills and optional runtime; browser only when container supports it	Declared image builds; generated freshness and the 136-test GStack 2 suite pass, as does the clean runtime install/browser smoke. Full broad Linux coverage remains pending.

The six portable skills remain useful when runtime installation fails. A runtime failure must not remove or corrupt their standard-installer placement.

Native adapters

No GStack 2 native tier is currently required or awarded. A future native bundle needs an accepted issue showing that a host API is necessary, must load the same canonical judgment modules, and must pass the portable parity suite. Host-specific presentation metadata such as agents/openai.yaml does not by itself create a second judgment source or a Native claim.

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