16b61d437f
Adversarial review of the Phase 3 branch surfaced three verified defects; fix all three in place (no defer): - install-runtime-artifacts.test.cjs: finish the fold-triplication dedup started earlier (only enh-1511 had been collapsed). 11 B1-batch __foldDescribe blocks were byte-identical triplicates (~5.9k lines, ~49% of the file), tripling the subprocess-spawning installer suites under --test-concurrency — the same starvation that produced the temp-dir races this branch fixes. Byte-identity verified per block before removal; 230 distinct test/it titles preserved (origin/next: 230 -> 230), interleaved B3/B5/B6 singletons untouched. - config-get-default.test.cjs: make runExpectError faithful to production. The throwing process.exit seam was caught by cmdConfigGet's "No config.json" guard and reclassified into a spurious 2nd error() with the wrong reason (CONFIG_PARSE_FAILED). Drive io.setJsonErrorMode + carry the original message on the sentinel so the guard re-throws (single fire), assert exitCount===1, and strengthen both probes to assert the typed reason (CONFIG_NO_FILE / CONFIG_KEY_NOT_FOUND). - roadmap.test.cjs: lock the #2121/#2114 malformed_roadmap parity — a project-code-prefixed query against a checklist-only roadmap now surfaces the same diagnostic a bare query always did (fails on prior silent-empty behavior). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
GSD Core
Git. Ship. Done.
English · Português · 简体中文 · 日本語 · 한국어
A light-weight meta-prompting, context engineering, and spec-driven development system for Claude Code, OpenCode, Antigravity CLI, Kimi CLI, Kilo, Codex, Copilot, Cursor, Windsurf, and more.
What is GSD Core
GSD Core is a context-engineering and spec-driven development framework that drives AI coding agents (Claude Code, Codex, Antigravity CLI, Kimi CLI, Copilot, Cursor, and more) through a disciplined phase loop. It solves context rot — the quality degradation that accumulates as an AI fills its context window — by running all heavy research, planning, and execution work in fresh-context subagents while keeping your main session lean.
How it works
Each milestone repeats the same five-step loop, one phase at a time:
- Discuss — capture implementation decisions before anything is planned
- Plan — research, decompose, and verify the plan fits a fresh context window
- Execute — run plans in parallel waves; each executor starts with a clean 200k-token context
- Verify — walk through what was built; diagnose and fix before declaring done
- Ship — create the PR, archive the phase, repeat for the next one
Quickstart
npx @opengsd/gsd-core@latest
The installer prompts for your runtime (Claude Code, OpenCode, Antigravity CLI, Kimi CLI, Kilo, Codex, Copilot, Cursor, Windsurf, and more) and whether to install globally or locally. The installer is required for cross-runtime compatibility — do not copy files from agents/ or commands/ directly.
On another runtime or without Node.js? See Install on your runtime.
Once installed, start a new project or onboard an existing repo:
/gsd-new-project # greenfield project
/gsd-onboard # existing codebase
New here? Follow Your first project for a guided walkthrough from install to first shipped phase, or Onboarding an existing codebase for brownfield setup.
Documentation
Tutorials — learning by doing:
How-to guides — task-focused recipes:
Reference — authoritative facts:
Explanation — concepts and design decisions:
Full index: docs/README.md. Other languages: 日本語 · 한국어 · Português · 简体中文.
Why it works
Most AI-coding setups fail at scale because context bloat silently degrades output quality, there is no shared memory between sessions, and nothing verifies that code actually works. GSD Core solves all three: heavy work runs in fresh subagents, structured artifacts like STATE.md and CONTEXT.md survive session boundaries, and the verify step walks through what was built and generates fix plans before a phase is declared done. See docs/explanation/context-engineering.md for the full reasoning.
Troubleshooting? See docs/how-to/recover-and-troubleshoot.md.
Community
| Project | Platform |
|---|---|
| gsd-opencode | Original OpenCode port |
| Discord | Community support |
Star History
License
MIT License. See LICENSE for details.
Claude Code is powerful. GSD Core makes it reliable.