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* feat(#1431): runtime capability registry overlay (ADR-1244 Phase 2) Promote the registry from a frozen data file to loadRegistry({includeInstalled}), composing the first-party registry with a validated installed overlay (ADR-1244 D2): - Extract the conformance validator to a shared runtime-callable module (gsd-core/bin/lib/capability-validator.cjs); the generator re-exports it verbatim, guarded by a generative-parity test (no build-time/runtime drift). - capability-loader.cts: loadRegistry({includeInstalled}) composes first-party ∪ validated overlay from $GSD_HOME/.gsd/capabilities (global) and <root>/.gsd/capabilities (project) via the canonical buildRegistry. First-party always wins (id/skill/agent/config/command-family + reserved gsd-/anthropic- prefixes); full merged-set cross-capability validation; engines.gsd load-time re-gate (skip-with-warning); gate-kind capabilities FAIL CLOSED; fragment-path escapes rejected. - semverSatisfies (hand-written, no dep) for the engines.gsd gate, fail-closed. - Wire surface/state + loop to the overlay; loop injects a blocking gate for each skipped gate-kind overlay (fail-closed). - cwd-aware overlay config-key federation: config-loader _federatedConfigSchema(cwd) + config-schema isValidConfigKey(key, cwd) compose the overlay per loadConfig/ config-set call (never eager at module load, never wrong-cwd); first-party path unchanged with no cwd. - run-tests.cjs sandboxes GSD_HOME (idempotent — nested spawns reuse it) for test hermeticity; capability-loader.cjs git+eslint-ignored (tsc artifact); capability-validator.cjs stays linted (#551 migration coverage). Closes #1431 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * docs(#1431): add changeset for runtime capability registry overlay Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * test(#1431): kill config-schema cwd-aware federation mutants (Stryker ≥52) The cwd-aware overlay config-key federation added to config-schema.cts (_capabilityConfigSchema(cwd) + isCapabilityConfigKey/isValidConfigKey cwd threading) introduced mutable surface uncovered by config-schema's mutation test set, dropping its score to 39.58% (below the 52 break threshold). Add a real-overlay-fixture describe block exercising every branch (cwd guard, overlay loadRegistry, found-branch, first-party fallback, cwd threading); local Stryker score 39.58% -> 77.08%. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 <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
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
- 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
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
- Architecture — system architecture, agent model, and data flow
- 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
- Root README — landing page, quickstart, and documentation overview
- Changelog — release history