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* feat(#3411): one canonical Windows binary resolver in the platform seam CONTEXT.md declares src/shell-command-projection.cts the single OS-facing seam, but Windows binary resolution had grown four divergent implementations outside it. #3445 folded two of them together — inside gsd-core/bin/gsd-tools.cjs, not the seam — so the declaration stayed untrue and execTool still had no handling at all. Lift the resolver into the seam as resolveExecutableBinary, and export the half that actually executes as projectSpawnInvocation: CreateProcess cannot run a .cmd/.bat, so the cmd.exe mediation is inseparable from the lookup and splitting them is how the copies accumulated. cmd.exe is invoked with an explicit argv array, never shell:true — CVE-2024-27980's vector and Node 26's DEP0190. execTool now resolves on win32. POSIX is a strict no-op by construction, which matters: execTool rates CRITICAL blast radius (167 symbols, 53 files). gsd-tools.cjs deletes its private scan and its private mediation and delegates. Two semantics grown beyond #3445's resolver, both additive: a name already carrying a PATHEXT-listed extension is tried as-is before the append loop, and a suffix outside PATHEXT is not treated as an extension. Refs #3411 * fix(#3411): keep mediating a declared .cmd that PATH resolution misses Standards review caught a narrowing against the code this replaces. gsd-tools.cjs computed `target = resolveSpawnBinary(binary) || binary` and keyed the shim test on `target`, so a declared .cmd mediated whether or not PATH resolution found it. That is load-bearing: resolveExecutableBinary scans PATH only, while `cmd.exe /c` also finds a batch file in the current directory. Mediation now keys on the target — resolved path, else declared name. The ENOENT contract still holds for BARE unresolved names, which is the case it was written for. P9/P10 pin both halves. Spec review found E1/E2/E3/E5 promised by 50-test-matrix.md but never written; added. E3 is the integration proof that the CVE-relevant mediation fires through execTool, not only through projectSpawnInvocation in isolation. Also adds the CONTEXT.md glossary entry for the seam's new resolution ownership (a PR gate) and the changeset fragment. Refs #3411 * fix(#3617): pass mediated cmd.exe arguments verbatim so metacharacters cannot inject The isolated security pass found the mediation shape carried an argument-injection surface. libuv's quote_cmd_arg force-quotes an argv element only when it contains a space, tab, or quote — never for a cmd metacharacter — and cmd.exe re-parses everything after /c. So an arg of a&calc arrived unquoted and cmd ran calc. Node's own CVE-2024-27980 escaping cannot help: it fires only when the spawned FILE is the .bat/.cmd, and here the file is cmd.exe. Caret-escaping is not a fix. It is correct only when libuv does not quote, and libuv quotes whenever the arg also contains a space — no per-arg transform is right in both cases. So build the command line and pass it through verbatim, the shape Rust's std adopted for the sibling CVE-2024-24576: one outer quote pair that cmd /c strips, every token inside force-quoted, embedded quotes doubled. An argument containing CR or LF is refused rather than mediated — a newline cannot be represented in a Windows command line, so mediating would silently truncate. Failing visibly is correct. Known limit, documented at the seam: %VAR% still expands inside a /c string and has no escape outside a batch file. That is information disclosure, not arbitrary execution, and is the same limit Rust's std documents. This was byte-for-byte the shape #3445 shipped, so the fix closes it for the reviewer-lane spawn path too, not only for execTool's newly reachable route. Refs #3411 * docs(#3617): document the subprocess-execution security posture Adds Layer 4 to the security model: why GSD never uses shell:true for binary invocation (CVE-2024-27980, Node 26 DEP0190), why resolution is explicit and never tries the bare name on Windows (the npm extensionless-shim trap behind #3275), and why .cmd/.bat mediation builds a verbatim force-quoted command line rather than relying on default escaping — Node's own CVE protection cannot fire once the started program is cmd.exe. The residual %VAR% expansion limit is stated plainly under Trade-offs rather than left implicit: it is information disclosure, not arbitrary execution, and callers passing untrusted text to a Windows .cmd should not assume the value arrives byte-identical. Docs-only; no code change. Refs #3411 * chore(#3617): backfill changeset pr number 3621 * fix(#3617): read PATH, PATHEXT and ComSpec case-insensitively The Windows CI lane on #3621 failed E5, and the root cause was a defect in the implementation, not the assertion. Windows names the variable Path, not PATH. process.env is a case-insensitive proxy, so process.env.PATH works — but execTool builds { ...process.env, ...opts.env } whenever a caller supplies opts.env, and spreading discards the proxy while keeping the OS's actual casing. The exact-case env['PATH'] lookup then returned undefined, the PATH scan saw zero segments, resolution returned null, and the change degraded to precisely the spawn ENOENT it exists to fix. ComSpec and PATHEXT had the same exposure. #3445's tests never caught it because they pass uppercase keys explicitly, and neither did the Linux remote runner — this is a defect only the Windows lane could see. _envGet resolves a variable by exact match first (so a canonical caller pays no scan) and falls back to a case-insensitive sweep. R23 and P16 pin it and were proven RED by execution: with the fix stashed and build:lib re-run, R23 returned null and P16 returned the cmd.exe default. R24 was rewritten because the first version was vacuous — it staged foo.CMD, so the default PATHEXT already contained .CMD and it passed against the broken code for the wrong reason. It now stages foo.XYZ, an extension absent from the default, and carries a negative control asserting that dropping the Pathext key yields null. Re-proven RED the same way. E5's assertion was corrected alongside the fix: 'PATH' in options.env expressed the wrong contract. It now checks case-insensitively for the key. Refs #3411 * fix(#3617): execTool spawns the declared name unless mediation is required The Windows full-test lane on #3621 failed tests/graphify.test.cjs — the python3 identity check asserted 'python3' and got the absolute resolved path C:\hostedtoolcache\windows\Python\3.12.10\x64\python3.EXE instead. Those tests are correct and the change was wrong. They pin a long-standing contract — execTool spawns the program name it was given — by spying on spawnSync's first argument, and routing every win32 call through the projected invocation broke it. Resolving a .exe buys nothing. libuv's CreateProcess path already performs PATH + PATHEXT search, which is why spawning a bare 'node' has always worked on Windows. The only case the OS genuinely cannot spawn is a .cmd/.bat. So execTool now adopts the projection only when mediation actually happened — windowsVerbatimArguments is exactly that flag — and otherwise passes the declared program and args through untouched. 40-design.md already rejected gratuitous change for this reason: symmetry is not worth a behavior change to 53 files that fixes nothing. That reasoning was applied to POSIX and missed the win32 non-batch case. Rows 5 and 20 now record it, and the CONTEXT.md glossary states the caller-choice rule. deps.spawn deliberately still adopts the resolved path: its hasBinary probe answers from the same resolver, so probe and spawn must agree on the exact file (#3445). The asymmetry is now documented at both call sites rather than latent. E7 pins the restored contract and was verified by executing execTool against a monkeypatched spawnSync: python3 in, python3 spawned. Refs #3411 --------- Co-authored-by: sim <sim@local>
GSD Core documentation
Documentation is organised into four quadrants: tutorials help you learn by doing, how-to guides solve specific tasks, reference states authoritative facts, and explanation explores concepts and design decisions.
Language versions: English · Português (pt-BR) · 日本語 · 简体中文
Tutorials
- Your first project — install to first shipped phase, one guaranteed path
- Onboarding an existing codebase — bring GSD Core to a brownfield repo
- Build your first capability — author a tiny declarative capability and watch it act in the loop
- Install your first capability — install a third-party capability end-to-end: consent, verify, check for updates, remove
How-to guides
- Install on your runtime — runtime-specific install steps for all 16 supported runtimes
- Install a minimal GSD and add skills later — install only the core skills, then grow the surface with profiles and
/gsd-surface - Attach a plugin-provided skill to a GSD agent — use the
global:plugin:skillentry form to load Claude Code plugin skills into agent prompts - Discuss a phase — capture implementation decisions before planning begins
- Resolve edge-coverage findings — turn the spec phase's surfaced domain-boundary edges into covered, dismissed, or backstopped spec decisions
- Resolve prohibition findings — turn the spec phase's surfaced must-NOT constraints into resolved, dismissed, or deferred spec decisions
- Resolve an unreachable-workflow finding — wire or fully sweep a shipped workflow that no command, agent, or skill references
- Resolve a contract-drift finding — bring an agent's completion contract, read-tag gate, or deleted-file test reference back into agreement with the registry
- Resolve unreachable-guard findings — fix shell guards whose fallback arm cannot run, and tell "nothing to report" apart from "could not look"
- Resolve an ESLint glob-coverage finding — bring a source file that matches no lint rule under coverage, or record a reasoned exemption
- Keep planning docs out of a shared repo — make
.planning/local-only, including untracking files git already tracks (the step.gitignorealone cannot do) - Plan a phase — run research, decompose work, and verify plan quality
- Execute a phase — run plans in parallel waves with fresh-context subagents
- Verify and ship — walk through completed work, diagnose failures, and create the PR
- Catch complexity before it compounds — enable the post-execute refactor hook, read a proposal's score vs. anchor delta, and accept or decline it
- Run phases autonomously — use autonomous mode for unattended phase execution
- Handle quick and fast tasks — use
/gsd-quickand/gsd-fastfor ad-hoc work outside the phase loop - Configure model profiles — switch between quality, balanced, and budget model tiers
- Control which host runtime GSD reports — read the
agent_runtimeladder, understand what host detection looks at, and pin the runtime when detection is not what you want - Set up cross-AI review — configure a second AI to review code produced by the primary agent
- Work in parallel with workstreams — run independent lines of work simultaneously using workstreams
- Isolate work with workspaces — use workspaces to sandbox experimental or risky changes
- Debug a failed execution — diagnose and recover from broken or incomplete phase execution
- Interpret scope-conformance warnings — read the advisory the worktree-wave merge emits when a plan branch commits outside its declared scope
- Interpret install-shadow warnings — read the advisory GSD Core emits when a
/gsd-*trigger is installed at both scopes and one silently wins, and tell "nothing to report" apart from "could not look" - Interpret
state validateresults — read thescopereason codes and tell "nothing to report" apart from "could not look" - Spike and sketch — use
/gsd-spikeand/gsd-sketchfor exploratory work before committing to a plan - Design a UI phase — use the UI phase loop for frontend and visual work
- Develop a Capability for GSD 1.5+ — add feature Capabilities, hook fragments, and registry entries
- Ship a reviewer lane in your capability — declare a
reviewerbody so/gsd-reviewdiscovers, invokes, and renders your external review CLI or model endpoint - List your reviewer lane in the registry — publish a lane you have built to the Reviewer Lane Registry so other people can find and install it
- Take over a capability or EoS integration — assume maintainership of an existing third-party capability, reviewer lane, or EoS host integration through a handoff, an adoption fork, first-party absorption, or a de-listing
- Add or update a host's integration — set a host's documentation-sourced
runtime.hostIntegrationaxes (ADR-1239 Phase A), with theundocumentedsentinel rule - Migrate an install test to the executed plan — convert an
fs.existsSync-probing install test group to a value assertion againstinstallRuntimeArtifacts's executed-plan return, and test against a fake fs adapter - Turn a capability off (and keep it off) — disable a capability via the surface, or gate individual hooks off without removing the capability
- Drive GSD from a tracker issue — start a phase from a GitHub, Linear, or Jira issue
- Migrate from GSD 2 — upgrade an existing GSD 2 project to GSD Core
- Update GSD — re-run the installer to pick up the latest release
- Clean up get-shit-done-cc — remove leftover old-package artifacts that cause a spurious
⬆ /gsd-updateindicator after migrating to@opengsd/gsd-core - Fix the worktree base-mismatch (exit 42) error — resolve the branch-divergence condition that halts parallel phase execution
- Recover and troubleshoot — fix common problems, rebuild context, and uninstall
Reference
- Commands — every command with flags and examples
- Configuration — full config schema, model profiles, git branching strategies
- CLI tools —
gsd-tools.cjsprogrammatic API for workflows and agents - JSON error mode —
gsd-toolsfailure channels: faults (stderr, exit 1) vs degraded results (stdout, exit 0), and the reason-code taxonomy - Features — complete feature index
- Inventory — installed skills and surface map
- STATE.md schema — field-by-field reference for
.planning/STATE.md - CONTEXT.md schema — field-by-field reference for
.planning/phases/<N>/CONTEXT.md - PLAN.md schema — field-by-field reference for
.planning/phases/<N>/PLAN.md - Planning artifacts — all
.planning/files and their roles - Review and verification capabilities — code review, security, and Nyquist capability ownership and hook contracts
- Gate predicates — canonical specification of the phase-gate predicate vocabulary
- Capability matrix — generated catalogue of every capability's role, tier, extension points, hook kinds, and
engines.gsd - Capability manifest — the full
capability.jsonschema and validation rules gsd capabilitycommand — install / update / remove / list reference for third-party capabilities- Workflow fragments — in-file
<!-- gsd:section -->marker grammar for fragmentizing workflow markdown at emission time - Reviewer Lane Registry — generated catalogue of third-party reviewer lanes, with their flags, transport, and install commands
Explanation
- Context engineering — how context rot forms and how GSD Core prevents it
- The phase loop — design rationale for the Discuss → Plan → Execute → Verify → Ship cycle
- Multi-agent orchestration — how subagents are spawned, scoped, and coordinated
- Security model — trust boundaries, permissions, and safe automation
- The capability trust model — why third-party capabilities are gated by consent + integrity + reversibility, not a sandbox
- How overlay capabilities compose — why first-party always wins and how the loader resolves precedence, conflicts, and fail-open load-failure warnings
- Architecture — system architecture, agent model, and data flow
- The Embeddable Orchestration System — one public, versioned contract for embedding GSD across many hosts
- Discuss modes — assumptions mode vs interview mode for
/gsd-discuss-phase - Context monitoring — context window monitoring hook architecture
- Issue-driven orchestration — recipe for driving GSD from a tracker issue using existing primitives
Related
- What's new in 1.7.0 — curated highlights of the 1.7.0 release
- Root README — landing page, quickstart, and documentation overview
- Changelog — release history