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* refactor(#3180): one owner for completion ratio, a prompt-layer drift guard, and a written behavior contract The 2026-08-08 coverage audit on #3180 found the epic's copy counts were a lower bound for the third consecutive time, and that two derivation families had never been named at all. ADR-3180 gains Decision 7 — a normative behavior contract that says what the right answer IS for each derivation, not merely who owns it. A reviewer with no written rule can only ask "does this look like the others", which is how a fifth copy passes review. Decision 4 gains (d) scan surface is every authored surface and an owner FILE is never exempt, only its named functions; and (e) a surface that cannot be consolidated today ships ratcheted, never unguarded. Completion ratio: `clampPercent` sat exported and unused beside six hand-inlined copies of its own body across five modules. All six now route through it; `clampPercentFromFraction` is added for the one caller that already held a fraction. Every migration is behaviour-identical — clampPercent's first line IS the `total > 0 ? … : 0` ternary each copy carried. Guarded by lint-completion-ratio-drift.cjs, which reports zero re-derivations with no file-level exemption. Prompt layer: workflow markdown re-derives live-plan counting in raw shell (#1762), invisible to every `src/`-scoped guard. lint-planning-prompt-drift.cjs scans it with a shrink-only baseline of the 7 sites that exist today — new sites fail, and a baseline entry that stops firing fails too, so an acknowledgment can never outlive the thing it describes. lint-milestone-window-drift.cjs stops exempting its owner file wholesale; only the four named canonical functions are exempt now. The blanket exemption was pointed at the one file most likely to grow the next copy, and it had. Refs #3180 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * docs(#3180): link Phases 6-8 sub-issues (#3216, #3217, #3218) from ADR-3180 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * fix(#3180): address orthogonal review — consumer-output identity tests, count-keyed ratchet, property coverage Five findings from the two orthogonal review passes, all fixed. Decision 4(c) breach: the completion-ratio identity test asserted at the OWNER, which is exactly the bypass that decision exists to close — a consumer can call clampPercent and then post-process locally, leaving both the lint and an owner-level test green. It now drives `roadmap analyze`, `query progress` and `stats` and asserts on their own output, over a fixture containing a `status: superseded` plan so a consumer that re-counted raw files would report 60 where the owner reports 75. Decision 4(e) breach: ratchet entries named the epic (#3180) rather than the issue that removes them. They name Phase 8 (#3218) now. The ratchet keyed on (file, text) alone, so plan-phase.md's two byte-identical sites were one indistinguishable key and migrating either would have left the guard green with the other alive. Entries carry an occurrence count; fewer than acknowledged fails as a partial migration, more fails as a new copy. Adds the missing MAX_REGEX_LITERAL_LEN boundary coverage the sibling guard's test already had, and the fast-check property tests CONTRIBUTING requires for clamp/budget-limit functions. Refs #3180 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * test: stop wrapping a nested double-spawn in a 15s wall-clock budget (bug #641 probes) `tests/ci-test-scope.test.cjs`'s `bug #641` block spawned `run-tests.cjs` under PROBE_TIMEOUT_MS=15000; that child then spawned a nested `node --test`. A fixed wall-clock budget around a double spawn, running inside a container that is concurrently executing the full ~31k-test suite, fails by construction under load. Confirmed against three full matrix runs. Every failure was shaped `null !== 0` — the child was KILLED, never an assertion about the thing under test. One captured probe had already printed the correct resolution (`suite="all" files=2: a.test.cjs b.test.cjs`) and was killed anyway. It reproduces on `next` alone: 5 failures on linux-node22, 0 on linux-node24. The victim subset varies by run and by lane. What these tests are actually about is suite-token RESOLUTION — `unit` as a bare token in --files/--files-from. Executing the seeded trivial files is incidental and is the entire timeout surface, so the assertions move in-process against the same functions `main()` calls, in the same order. `parseArgs`, `selectExplicitFiles`, `selectFiles` and `walkTestFiles` are exported for that; no behavior, signature or logic changed. No coverage lost: `tests/run-tests-harness.test.cjs` already spawns the harness for real and asserts exit codes end to end, on a 120s budget. Pre-existing on `next`, fixed here rather than deferred. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * test: delete the three elapsed-time assertions CLAUDE.md forbids asserting on wall-clock time. Three assertions did, and all three are load-sensitive: on a saturated bench each can fail while the code under test is correct. In every case the load-bearing assertion sits on the line above and the timing line adds no discrimination. run-with-timeout: the stated worry — "was this 124 the cap firing or the 30s harness backstop?" — is already answered by the assertion above it. A backstop kills by signal, which surfaces as status null, never 124. Observed directly this session: three matrix runs produced exactly that null shape from killed children. normalize-test-command and context-predicates: both bounded a ReDoS check. A threshold only ever separates "fast" from "slightly slow", which is bench load, not correctness — catastrophic backtracking on 800 KB of input does not take 251ms, it does not finish at all. A real regression therefore shows up as the suite being killed on that test, which is louder and more reliable than a number. The structural assertions (returned unchanged; cleanly rejected) are what actually carry those tests, and they stay. The sweep now reports zero elapsed-time assertions in tests/. The remaining Date.now() uses are unique-path suffixes, barrier deadlines, fixture timestamps and fake mtimes — none of them assertions. Pre-existing on `next`, fixed here rather than deferred. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * chore(#3180): backfill changeset PR number (#3223) Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * fix(#3180): key the prompt-drift ratchet on POSIX paths so it works on Windows The baseline keys on (file, trimmed text). `file` came from scanTree's `path.relative()`, which uses NATIVE separators, while the committed baseline stores POSIX. On Windows every violation was therefore unmatched — reported as FRESH — and every baseline entry matched nothing — reported as STALE. The guard failed 100% of the time there, on both CI shards: ✖ scanRepo(repoRoot) matches the baseline exactly: zero fresh AND zero stale + { file: 'gsd-core\\workflows\\execute-plan.md', ... } The remote runner this repo gates on is Linux-only and cannot see this class at all; the GitHub Actions Windows lane is what caught it. Normalization is unconditional — never gated on process.platform. A platform-conditional normalizer makes the POSIX path the special case and leaves the Windows branch unexercised on every other OS, which is the same blind spot in a different place. It is applied at one seam inside findPromptDrift, which builds `file` on every returned violation, so the baseline key, the --update writer, the stderr report and the tests all consume one normalized value. The regression tests drive a Windows-shaped relPath directly and run on every OS rather than skipping off-Windows — a test that only runs on the platform where the bug lives is why this escaped. They include a sanity check that un-normalized input does NOT match, so the assertion cannot pass vacuously. Audited the three sibling guards: none keys against a committed cross-platform baseline, and their exemption keys are path.join-built, so producer and consumer share the native convention. Left correct code alone rather than making them look alike. scripts/lib/drift-scan.cjs is untouched — normalizing there would break those three on Windows. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> --------- Co-authored-by: sim <sim@local> Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
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
- 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
- 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
- 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
- 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 - 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 - 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